By default, scons searches for a file named SConstruct, Sconstruct, or sconstruct (in that order) in the current directory and reads its configuration from the first file found. An alternate file name may be specified via the -f option.

The SConstruct file can specify subsidiary configuration files using the SConscript() function. By convention, these subsidiary files are named SConscript, although any name may be used. (Because of this naming convention, the term "SConscript files" is sometimes used to refer generically to all scons configuration files, regardless of actual file name.)

The configuration files specify the target files to be built, and (optionally) the rules to build those targets. Reasonable default rules exist for building common software components (executable programs, object files, libraries), so that for most software projects, only the target and input files need be specified.

Before reading the SConstruct file, scons looks for a directory named site_scons in various system directories (see below) and the directory containing the SConstruct file; for each of those dirs which exists, site_scons is prepended to sys.path, the file site_scons/site_init.py, is evaluated if it exists, and the directory site_scons/site_tools is prepended to the default toolpath if it exists. See the --no-site-dir and --site-dir options for more details.

scons reads and executes the SConscript files as Python scripts, so you may use normal Python scripting capabilities (such as flow control, data manipulation, and imported Python libraries) to handle complicated build situations. scons, however, reads and executes all of the SConscript files before it begins building any targets. To make this obvious, scons prints the following messages about what it is doing:

$ scons foo.out
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets  ...
cp foo.in foo.out
scons: done building targets.
$

The status messages (everything except the line that reads "cp foo.in foo.out") may be suppressed using the -Q option.

scons does not automatically propagate the external environment used to execute scons to the commands used to build target files. This is so that builds will be guaranteed repeatable regardless of the environment variables set at the time scons is invoked. This also means that if the compiler or other commands that you want to use to build your target files are not in standard system locations, scons will not find them unless you explicitly set the PATH to include those locations. Whenever you create an scons construction environment, you can propagate the value of PATH from your external environment as follows:

import os
env = Environment(ENV = {'PATH' : os.environ['PATH']})

Similarly, if the commands use external environment variables like $PATH, $HOME, $JAVA_HOME, $LANG, $SHELL, $TERM, etc., these variables can also be explicitly propagated:

import os
env = Environment(ENV = {'PATH' : os.environ['PATH'],
                         'HOME' : os.environ['HOME']})

Or you may explicitly propagate the invoking user's complete external environment:

import os
env = Environment(ENV = os.environ)

This comes at the expense of making your build dependent on the user's environment being set correctly, but it may be more convenient for many configurations.

scons can scan known input files automatically for dependency information (for example, #include statements in C or C++ files) and will rebuild dependent files appropriately whenever any "included" input file changes. scons supports the ability to define new scanners for unknown input file types.

scons knows how to fetch files automatically from SCCS or RCS subdirectories using SCCS, RCS or BitKeeper.

scons is normally executed in a top-level directory containing a SConstruct file, optionally specifying as command-line arguments the target file or files to be built.

By default, the command

scons

will build all target files in or below the current directory. Explicit default targets (to be built when no targets are specified on the command line) may be defined the SConscript file(s) using the Default() function, described below.

Even when Default() targets are specified in the SConscript file(s), all target files in or below the current directory may be built by explicitly specifying the current directory (.) as a command-line target:

scons .

Building all target files, including any files outside of the current directory, may be specified by supplying a command-line target of the root directory (on POSIX systems):

scons /

or the path name(s) of the volume(s) in which all the targets should be built (on Windows systems):

scons C:\ D:\

To build only specific targets, supply them as command-line arguments:

scons foo bar

in which case only the specified targets will be built (along with any derived files on which they depend).

Specifying "cleanup" targets in SConscript files is not usually necessary. The -c flag removes all files necessary to build the specified target:

scons -c .

to remove all target files, or:

scons -c build export

to remove target files under build and export. Additional files or directories to remove can be specified using the Clean() function. Conversely, targets that would normally be removed by the -c invocation can be prevented from being removed by using the NoClean() function.

A subset of a hierarchical tree may be built by remaining at the top-level directory (where the SConstruct file lives) and specifying the subdirectory as the target to be built:

scons src/subdir

or by changing directory and invoking scons with the -u option, which traverses up the directory hierarchy until it finds the SConstruct file, and then builds targets relatively to the current subdirectory:

cd src/subdir
scons -u .

scons supports building multiple targets in parallel via a -j option that takes, as its argument, the number of simultaneous tasks that may be spawned:

scons -j 4

builds four targets in parallel, for example.

scons can maintain a cache of target (derived) files that can be shared between multiple builds. When caching is enabled in a SConscript file, any target files built by scons will be copied to the cache. If an up-to-date target file is found in the cache, it will be retrieved from the cache instead of being rebuilt locally. Caching behavior may be disabled and controlled in other ways by the --cache-force, --cache-disable, --cache-readonly, and --cache-show command-line options. The --random option is useful to prevent multiple builds from trying to update the cache simultaneously.

Values of variables to be passed to the SConscript file(s) may be specified on the command line:

scons debug=1 .

These variables are available in SConscript files through the ARGUMENTS dictionary, and can be used in the SConscript file(s) to modify the build in any way:

if ARGUMENTS.get('debug', 0):
    env = Environment(CCFLAGS = '-g')
else:
    env = Environment()

The command-line variable arguments are also available in the ARGLIST list, indexed by their order on the command line. This allows you to process them in order rather than by name, if necessary. ARGLIST[0] returns a tuple containing (argname, argvalue). A Python exception is thrown if you try to access a list member that does not exist.

scons requires Python version 2.7 or later. There should be no other dependencies or requirements to run scons.

By default, scons knows how to search for available programming tools on various systems. On Windows systems, scons searches in order for the Microsoft Visual C++ tools, the MinGW tool chain, the Intel compiler tools, and the PharLap ETS compiler. On OS/2 systems, scons searches in order for the OS/2 compiler, the GCC tool chain, and the Microsoft Visual C++ tools, On SGI IRIX, IBM AIX, Hewlett Packard HP-UX, and Sun Solaris systems, scons searches for the native compiler tools (MIPSpro, Visual Age, aCC, and Forte tools respectively) and the GCC tool chain. On all other platforms, including POSIX (Linux and UNIX) platforms, scons searches in order for the GCC tool chain, the Microsoft Visual C++ tools, and the Intel compiler tools. You may, of course, override these default values by appropriate configuration of Environment construction variables.  

OPTIONS

In general, scons supports the same command-line options as GNU make, and many of those supported by cons.

-b

Ignored for compatibility with non-GNU versions of make.

-c, --clean, --remove

Clean up by removing all target files for which a construction command is specified. Also remove any files or directories associated to the construction command using the Clean() function. Will not remove any targets specified by the NoClean() function.

--cache-debug=file

Print debug information about the CacheDir() derived-file caching to the specified file. If file is - (a hyphen), the debug information are printed to the standard output. The printed messages describe what signature file names are being looked for in, retrieved from, or written to the CacheDir() directory tree.

--cache-disable, --no-cache

Disable the derived-file caching specified by CacheDir(). scons will neither retrieve files from the cache nor copy files to the cache.

--cache-force, --cache-populate

When using CacheDir(), populate a cache by copying any already-existing, up-to-date derived files to the cache, in addition to files built by this invocation. This is useful to populate a new cache with all the current derived files, or to add to the cache any derived files recently built with caching disabled via the --cache-disable option.

--cache-readonly

Use the cache (if enabled) for reading, but do not not update the cache with changed files.

--cache-show

When using CacheDir() and retrieving a derived file from the cache, show the command that would have been executed to build the file, instead of the usual report, "Retrieved `file' from cache." This will produce consistent output for build logs, regardless of whether a target file was rebuilt or retrieved from the cache.

--config=mode

This specifies how the Configure call should use or generate the results of configuration tests. The option should be specified from among the following choices:

--config=auto

scons will use its normal dependency mechanisms to decide if a test must be rebuilt or not. This saves time by not running the same configuration tests every time you invoke scons, but will overlook changes in system header files or external commands (such as compilers) if you don't specify those dependecies explicitly. This is the default behavior.

--config=force

If this option is specified, all configuration tests will be re-run regardless of whether the cached results are out of date. This can be used to explicitly force the configuration tests to be updated in response to an otherwise unconfigured change in a system header file or compiler.

--config=cache

If this option is specified, no configuration tests will be rerun and all results will be taken from cache. Note that scons will still consider it an error if --config=cache is specified and a necessary test does not yet have any results in the cache.

-C directory, --directory=directory

Change to the specified directory before searching for the SConstruct, Sconstruct, or sconstruct file, or doing anything else. Multiple -C options are interpreted relative to the previous one, and the right-most -C option wins. (This option is nearly equivalent to -f directory/SConstruct, except that it will search for SConstruct, Sconstruct, or sconstruct in the specified directory.)

-D

Works exactly the same way as the -u option except for the way default targets are handled. When this option is used and no targets are specified on the command line, all default targets are built, whether or not they are below the current directory.

--debug=type

Debug the build process. type[,type...] specifies what type of debugging. Multiple types may be specified, separated by commas. The following types are valid:

--debug=count

Print how many objects are created of the various classes used internally by SCons before and after reading the SConscript files and before and after building targets. This is not supported when SCons is executed with the Python -O (optimized) option or when the SCons modules have been compiled with optimization (that is, when executing from *.pyo files).

--debug=duplicate

Print a line for each unlink/relink (or copy) of a variant file from its source file. Includes debugging info for unlinking stale variant files, as well as unlinking old targets before building them.

--debug=dtree

A synonym for the newer --tree=derived option. This will be deprecated in some future release and ultimately removed.

--debug=explain

Print an explanation of precisely why scons is deciding to (re-)build any targets. (Note: this does not print anything for targets that are not rebuilt.)

--debug=findlibs

Instruct the scanner that searches for libraries to print a message about each potential library name it is searching for, and about the actual libraries it finds.

--debug=includes

Print the include tree after each top-level target is built. This is generally used to find out what files are included by the sources of a given derived file:

$ scons --debug=includes foo.o

--debug=memoizer

Prints a summary of hits and misses using the Memoizer, an internal subsystem that counts how often SCons uses cached values in memory instead of recomputing them each time they're needed.

--debug=memory

Prints how much memory SCons uses before and after reading the SConscript files and before and after building targets.

--debug=nomemoizer

A deprecated option preserved for backwards compatibility.

--debug=objects

Prints a list of the various objects of the various classes used internally by SCons.

--debug=pdb

Re-run SCons under the control of the pdb Python debugger.

--debug=prepare

Print a line each time any target (internal or external) is prepared for building. scons prints this for each target it considers, even if that target is up to date (see also --debug=explain). This can help debug problems with targets that aren't being built; it shows whether scons is at least considering them or not.

--debug=presub

Print the raw command line used to build each target before the construction environment variables are substituted. Also shows which targets are being built by this command. Output looks something like this:

$ scons --debug=presub
Building myprog.o with action(s):
  $SHCC $SHCFLAGS $SHCCFLAGS $CPPFLAGS $_CPPINCFLAGS -c -o $TARGET $SOURCES
...

--debug=stacktrace

Prints an internal Python stack trace when encountering an otherwise unexplained error.

--debug=stree

A synonym for the newer --tree=all,status option. This will be deprecated in some future release and ultimately removed.

--debug=time

Prints various time profiling information: the time spent executing each individual build command; the total build time (time SCons ran from beginning to end); the total time spent reading and executing SConscript files; the total time spent SCons itself spend running (that is, not counting reading and executing SConscript files); and both the total time spent executing all build commands and the elapsed wall-clock time spent executing those build commands. (When scons is executed without the -j option, the elapsed wall-clock time will typically be slightly longer than the total time spent executing all the build commands, due to the SCons processing that takes place in between executing each command. When scons is executed with the -j option, and your build configuration allows good parallelization, the elapsed wall-clock time should be significantly smaller than the total time spent executing all the build commands, since multiple build commands and intervening SCons processing should take place in parallel.)

--debug=tree

A synonym for the newer --tree=all option. This will be deprecated in some future release and ultimately removed.

--diskcheck=types

Enable specific checks for whether or not there is a file on disk where the SCons configuration expects a directory (or vice versa), and whether or not RCS or SCCS sources exist when searching for source and include files. The types argument can be set to: all, to enable all checks explicitly (the default behavior); none, to disable all such checks; match, to check that files and directories on disk match SCons' expected configuration; rcs, to check for the existence of an RCS source for any missing source or include files; sccs, to check for the existence of an SCCS source for any missing source or include files. Multiple checks can be specified separated by commas; for example, --diskcheck=sccs,rcs would still check for SCCS and RCS sources, but disable the check for on-disk matches of files and directories. Disabling some or all of these checks can provide a performance boost for large configurations, or when the configuration will check for files and/or directories across networked or shared file systems, at the slight increased risk of an incorrect build or of not handling errors gracefully (if include files really should be found in SCCS or RCS, for example, or if a file really does exist where the SCons configuration expects a directory).

--duplicate=ORDER

There are three ways to duplicate files in a build tree: hard links, soft (symbolic) links and copies. The default behaviour of SCons is to prefer hard links to soft links to copies. You can specify different behaviours with this option. ORDER must be one of hard-soft-copy (the default), soft-hard-copy, hard-copy, soft-copy or copy. SCons will attempt to duplicate files using the mechanisms in the specified order.

-f file, --file=file, --makefile=file, --sconstruct=file

Use file as the initial SConscript file. Multiple -f options may be specified, in which case scons will read all of the specified files.

-h, --help

Print a local help message for this build, if one is defined in the SConscript file(s), plus a line that describes the -H option for command-line option help. If no local help message is defined, prints the standard help message about command-line options. Exits after displaying the appropriate message.

-H, --help-options

Print the standard help message about command-line options and exit.

-i, --ignore-errors

Ignore all errors from commands executed to rebuild files.

-I directory, --include-dir=directory

Specifies a directory to search for imported Python modules. If several -I options are used, the directories are searched in the order specified.

--implicit-cache

Cache implicit dependencies. This causes scons to use the implicit (scanned) dependencies from the last time it was run instead of scanning the files for implicit dependencies. This can significantly speed up SCons, but with the following limitations:

scons will not detect changes to implicit dependency search paths (e.g. CPPPATH, LIBPATH) that would ordinarily cause different versions of same-named files to be used.

scons will miss changes in the implicit dependencies in cases where a new implicit dependency is added earlier in the implicit dependency search path (e.g. CPPPATH, LIBPATH) than a current implicit dependency with the same name.

--implicit-deps-changed

Forces SCons to ignore the cached implicit dependencies. This causes the implicit dependencies to be rescanned and recached. This implies --implicit-cache.

--implicit-deps-unchanged

Force SCons to ignore changes in the implicit dependencies. This causes cached implicit dependencies to always be used. This implies --implicit-cache.

--interactive

Starts SCons in interactive mode. The SConscript files are read once and a scons>>> prompt is printed. Targets may now be rebuilt by typing commands at interactive prompt without having to re-read the SConscript files and re-initialize the dependency graph from scratch.

SCons interactive mode supports the following commands:

build[OPTIONS] [TARGETS] ...

Builds the specified TARGETS (and their dependencies) with the specified SCons command-line OPTIONS. b and scons are synonyms.

The following SCons command-line options affect the build command:

--cache-debug=FILE
--cache-disable, --no-cache
--cache-force, --cache-populate
--cache-readonly
--cache-show
--debug=TYPE
-i, --ignore-errors
-j N, --jobs=N
-k, --keep-going
-n, --no-exec, --just-print, --dry-run, --recon
-Q
-s, --silent, --quiet
--taskmastertrace=FILE
--tree=OPTIONS

Any other SCons command-line options that are specified do not cause errors but have no effect on the build command (mainly because they affect how the SConscript files are read, which only happens once at the beginning of interactive mode).

clean[OPTIONS] [TARGETS] ...

Cleans the specified TARGETS (and their dependencies) with the specified options. c is a synonym. This command is itself a synonym for build --clean

exit

Exits SCons interactive mode. You can also exit by terminating input (CTRL+D on UNIX or Linux systems, CTRL+Z on Windows systems).

help[COMMAND]

Provides a help message about the commands available in SCons interactive mode. If COMMAND is specified, h and ? are synonyms.

shell[COMMANDLINE]

Executes the specified COMMANDLINE in a subshell. If no COMMANDLINE is specified, executes the interactive command interpreter specified in the SHELL environment variable (on UNIX and Linux systems) or the COMSPEC environment variable (on Windows systems). sh and ! are synonyms.

version

Prints SCons version information.

An empty line repeats the last typed command. Command-line editing can be used if the readline module is available.

$ scons --interactive
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons>>> build -n prog
scons>>> exit

-j N, --jobs=N

Specifies the number of jobs (commands) to run simultaneously. If there is more than one -j option, the last one is effective.

-k, --keep-going

Continue as much as possible after an error. The target that failed and those that depend on it will not be remade, but other targets specified on the command line will still be processed.

-m

Ignored for compatibility with non-GNU versions of make.

--max-drift=SECONDS

Set the maximum expected drift in the modification time of files to SECONDS. This value determines how long a file must be unmodified before its cached content signature will be used instead of calculating a new content signature (MD5 checksum) of the file's contents. The default value is 2 days, which means a file must have a modification time of at least two days ago in order to have its cached content signature used. A negative value means to never cache the content signature and to ignore the cached value if there already is one. A value of 0 means to always use the cached signature, no matter how old the file is.

--md5-chunksize=KILOBYTES

Set the block size used to compute MD5 signatures to KILOBYTES. This value determines the size of the chunks which are read in at once when computing MD5 signatures. Files below that size are fully stored in memory before performing the signature computation while bigger files are read in block-by-block. A huge block-size leads to high memory consumption while a very small block-size slows down the build considerably.

The default value is to use a chunk size of 64 kilobytes, which should be appropriate for most uses.

-n, --just-print, --dry-run, --recon

No execute. Print the commands that would be executed to build any out-of-date target files, but do not execute the commands.

--no-site-dir

Prevents the automatic addition of the standard site_scons dirs to sys.path. Also prevents loading the site_scons/site_init.py modules if they exist, and prevents adding their site_scons/site_tools dirs to the toolpath.

--profile=file

Run SCons under the Python profiler and save the results in the specified file. The results may be analyzed using the Python pstats module.

-q, --question

Do not run any commands, or print anything. Just return an exit status that is zero if the specified targets are already up to date, non-zero otherwise.

-Q

Quiets SCons status messages about reading SConscript files, building targets and entering directories. Commands that are executed to rebuild target files are still printed.

--random

Build dependencies in a random order. This is useful when building multiple trees simultaneously with caching enabled, to prevent multiple builds from simultaneously trying to build or retrieve the same target files.

-s, --silent, --quiet

Silent. Do not print commands that are executed to rebuild target files. Also suppresses SCons status messages.

-S, --no-keep-going, --stop

Ignored for compatibility with GNU make.

--site-dir=dir

Uses the named dir as the site dir rather than the default site_scons dirs. This dir will get prepended to sys.path, the module dir/site_init.py will get loaded if it exists, and dir/site_tools will get added to the default toolpath.

The default set of site_scons dirs used when --site-dir is not specified depends on the system platform, as follows. Note that the directories are examined in the order given, from most generic to most specific, so the last-executed site_init.py file is the most specific one (which gives it the chance to override everything else), and the dirs are prepended to the paths, again so the last dir examined comes first in the resulting path.

Windows:

%ALLUSERSPROFILE/Application Data/scons/site_scons
%USERPROFILE%/Local Settings/Application Data/scons/site_scons
%APPDATA%/scons/site_scons
%HOME%/.scons/site_scons
./site_scons

Mac OS X:

/Library/Application Support/SCons/site_scons
/opt/local/share/scons/site_scons (for MacPorts)
/sw/share/scons/site_scons (for Fink)
$HOME/Library/Application Support/SCons/site_scons
$HOME/.scons/site_scons
./site_scons

Solaris:

/opt/sfw/scons/site_scons
/usr/share/scons/site_scons
$HOME/.scons/site_scons
./site_scons

Linux, HPUX, and other Posix-like systems:

/usr/share/scons/site_scons
$HOME/.scons/site_scons
./site_scons

--stack-size=KILOBYTES

Set the size stack used to run threads to KILOBYTES. This value determines the stack size of the threads used to run jobs. These are the threads that execute the actions of the builders for the nodes that are out-of-date. Note that this option has no effect unless the num_jobs option, which corresponds to -j and --jobs, is larger than one. Using a stack size that is too small may cause stack overflow errors. This usually shows up as segmentation faults that cause scons to abort before building anything. Using a stack size that is too large will cause scons to use more memory than required and may slow down the entire build process.

The default value is to use a stack size of 256 kilobytes, which should be appropriate for most uses. You should not need to increase this value unless you encounter stack overflow errors.

-t, --touch

Ignored for compatibility with GNU make. (Touching a file to make it appear up-to-date is unnecessary when using scons.)

--taskmastertrace=file

Prints trace information to the specified file about how the internal Taskmaster object evaluates and controls the order in which Nodes are built. A file name of - may be used to specify the standard output.

-tree=options

Prints a tree of the dependencies after each top-level target is built. This prints out some or all of the tree, in various formats, depending on the options specified:

--tree=all

Print the entire dependency tree after each top-level target is built. This prints out the complete dependency tree, including implicit dependencies and ignored dependencies.

--tree=derived

Restricts the tree output to only derived (target) files, not source files.

--tree=status

Prints status information for each displayed node.

--tree=prune

Prunes the tree to avoid repeating dependency information for nodes that have already been displayed. Any node that has already been displayed will have its name printed in [square brackets], as an indication that the dependencies for that node can be found by searching for the relevant output higher up in the tree.

Multiple options may be specified, separated by commas:

# Prints only derived files, with status information:
scons --tree=derived,status

# Prints all dependencies of target, with status information
# and pruning dependencies of already-visited Nodes:
scons --tree=all,prune,status target

-u, --up, --search-up

Walks up the directory structure until an SConstruct , Sconstruct or sconstruct file is found, and uses that as the top of the directory tree. If no targets are specified on the command line, only targets at or below the current directory will be built.

-U

Works exactly the same way as the -u option except for the way default targets are handled. When this option is used and no targets are specified on the command line, all default targets that are defined in the SConscript(s) in the current directory are built, regardless of what directory the resultant targets end up in.

-v, --version

Print the scons version, copyright information, list of authors, and any other relevant information. Then exit.

-w, --print-directory

Print a message containing the working directory before and after other processing.

--no-print-directory

Turn off -w, even if it was turned on implicitly.

--warn=type, --warn=no-type

Enable or disable warnings. type specifies the type of warnings to be enabled or disabled:

--warn=all, --warn=no-all

Enables or disables all warnings.

--warn=cache-version, --warn=no-cache-version

Enables or disables warnings about the cache directory not using the latest configuration information CacheDir(). These warnings are enabled by default.

--warn=cache-write-error, --warn=no-cache-write-error

Enables or disables warnings about errors trying to write a copy of a built file to a specified CacheDir(). These warnings are disabled by default.

--warn=corrupt-sconsign, --warn=no-corrupt-sconsign

Enables or disables warnings about unfamiliar signature data in .sconsign files. These warnings are enabled by default.

--warn=dependency, --warn=no-dependency

Enables or disables warnings about dependencies. These warnings are disabled by default.

--warn=deprecated, --warn=no-deprecated

Enables or disables all warnings about use of currently deprecated features. These warnings are enabled by default. Note that the --warn=no-deprecated option does not disable warnings about absolutely all deprecated features. Warnings for some deprecated features that have already been through several releases with deprecation warnings may be mandatory for a release or two before they are officially no longer supported by SCons. Warnings for some specific deprecated features may be enabled or disabled individually; see below.

--warn=deprecated-copy, --warn=no-deprecated-copy

Enables or disables warnings about use of the deprecated env.Copy() method.

--warn=deprecated-source-signatures, --warn=no-deprecated-source-signatures

Enables or disables warnings about use of the deprecated SourceSignatures() function or env.SourceSignatures() method.

--warn=deprecated-target-signatures, --warn=no-deprecated-target-signatures

Enables or disables warnings about use of the deprecated TargetSignatures() function or env.TargetSignatures() method.

--warn=duplicate-environment, --warn=no-duplicate-environment

Enables or disables warnings about attempts to specify a build of a target with two different construction environments that use the same action. These warnings are enabled by default.

--warn=fortran-cxx-mix, --warn=no-fortran-cxx-mix

Enables or disables the specific warning about linking Fortran and C++ object files in a single executable, which can yield unpredictable behavior with some compilers.

--warn=future-deprecated, --warn=no-future-deprecated

Enables or disables warnings about features that will be deprecated in the future. These warnings are disabled by default. Enabling this warning is especially recommended for projects that redistribute SCons configurations for other users to build, so that the project can be warned as soon as possible about to-be-deprecated features that may require changes to the configuration.

--warn=link, --warn=no-link

Enables or disables warnings about link steps.

--warn=misleading-keywords, --warn=no-misleading-keywords

Enables or disables warnings about use of the misspelled keywords targets and sources when calling Builders. (Note the last s characters, the correct spellings are target and source.) These warnings are enabled by default.

--warn=missing-sconscript, --warn=no-missing-sconscript

Enables or disables warnings about missing SConscript files. These warnings are enabled by default.

--warn=no-md5-module, --warn=no-no-md5-module

Enables or disables warnings about the version of Python not having an MD5 checksum module available. These warnings are enabled by default.

--warn=no-metaclass-support, --warn=no-no-metaclass-support

Enables or disables warnings about the version of Python not supporting metaclasses when the --debug=memoizer option is used. These warnings are enabled by default.

--warn=no-object-count, --warn=no-no-object-count

Enables or disables warnings about the --debug=object feature not working when scons is run with the python -O option or from optimized Python (.pyo) modules.

--warn=no-parallel-support, --warn=no-no-parallel-support

Enables or disables warnings about the version of Python not being able to support parallel builds when the -j option is used. These warnings are enabled by default.

--warn=python-version, --warn=no-python-version

Enables or disables the warning about running SCons with a deprecated version of Python. These warnings are enabled by default.

--warn=reserved-variable, --warn=no-reserved-variable

Enables or disables warnings about attempts to set the reserved construction variable names CHANGED_SOURCES, CHANGED_TARGETS, TARGET, TARGETS, SOURCE, SOURCES, UNCHANGED_SOURCES or UNCHANGED_TARGETS. These warnings are disabled by default.

--warn=stack-size, --warn=no-stack-size

Enables or disables warnings about requests to set the stack size that could not be honored. These warnings are enabled by default.

--warn=target_not_build, --warn=no-target_not_built

Enables or disables warnings about a build rule not building the expected targets. These warnings are not currently enabled by default.

-Y repository, --repository=repository, --srcdir=repository

Search the specified repository for any input and target files not found in the local directory hierarchy. Multiple -Y options may be specified, in which case the repositories are searched in the order specified.

CONFIGURATION FILE REFERENCE

Construction Environments

A construction environment is the basic means by which the SConscript files communicate build information to scons. A new construction environment is created using the Environment function:

env = Environment()

Variables, called construction variables, may be set in a construction environment either by specifying them as keywords when the object is created or by assigning them a value after the object is created:

env = Environment(FOO = 'foo')
env['BAR'] = 'bar'

As a convenience, construction variables may also be set or modified by the parse_flags keyword argument, which applies the ParseFlags method (described below) to the argument value after all other processing is completed. This is useful either if the exact content of the flags is unknown (for example, read from a control file) or if the flags are distributed to a number of construction variables.

env = Environment(parse_flags = '-Iinclude -DEBUG -lm')

This example adds 'include' to CPPPATH, 'EBUG' to CPPDEFINES, and 'm' to LIBS.

By default, a new construction environment is initialized with a set of builder methods and construction variables that are appropriate for the current platform. An optional platform keyword argument may be used to specify that an environment should be initialized for a different platform:

env = Environment(platform = 'cygwin')
env = Environment(platform = 'os2')
env = Environment(platform = 'posix')
env = Environment(platform = 'win32')

Specifying a platform initializes the appropriate construction variables in the environment to use and generate file names with prefixes and suffixes appropriate for the platform.

Note that the win32 platform adds the SystemDrive and SystemRoot variables from the user's external environment to the construction environment's ENV dictionary. This is so that any executed commands that use sockets to connect with other systems (such as fetching source files from external CVS repository specifications like :pserver:anonymous@cvs.sourceforge.net:/cvsroot/scons) will work on Windows systems.

The platform argument may be function or callable object, in which case the Environment() method will call the specified argument to update the new construction environment:

def my_platform(env):
    env['VAR'] = 'xyzzy'

env = Environment(platform = my_platform)

Additionally, a specific set of tools with which to initialize the environment may be specified as an optional keyword argument:

env = Environment(tools = ['msvc', 'lex'])

Non-built-in tools may be specified using the toolpath argument:

env = Environment(tools = ['default', 'foo'], toolpath = ['tools'])

This looks for a tool specification in tools/foo.py (as well as using the ordinary default tools for the platform). foo.py should have two functions: generate(env, **kw) and exists(env). The generate() function modifies the passed-in environment to set up variables so that the tool can be executed; it may use any keyword arguments that the user supplies (see below) to vary its initialization. The exists() function should return a true value if the tool is available. Tools in the toolpath are used before any of the built-in ones. For example, adding gcc.py to the toolpath would override the built-in gcc tool. Also note that the toolpath is stored in the environment for use by later calls to Clone() and Tool() methods:

base = Environment(toolpath=['custom_path'])
derived = base.Clone(tools=['custom_tool'])
derived.CustomBuilder()

The elements of the tools list may also be functions or callable objects, in which case the Environment() method will call the specified elements to update the new construction environment:

def my_tool(env):
    env['XYZZY'] = 'xyzzy'

env = Environment(tools = [my_tool])

The individual elements of the tools list may also themselves be two-element lists of the form (toolname, kw_dict). SCons searches for the toolname specification file as described above, and passes kw_dict, which must be a dictionary, as keyword arguments to the tool's generate function. The generate function can use the arguments to modify the tool's behavior by setting up the environment in different ways or otherwise changing its initialization.

# in tools/my_tool.py:
def generate(env, **kw):
  # Sets MY_TOOL to the value of keyword argument 'arg1' or 1.
  env['MY_TOOL'] = kw.get('arg1', '1')
def exists(env):
  return 1

# in SConstruct:
env = Environment(tools = ['default', ('my_tool', {'arg1': 'abc'})],
                  toolpath=['tools'])

The tool definition (i.e. my_tool()) can use the PLATFORM variable from the environment it receives to customize the tool for different platforms.

If no tool list is specified, then SCons will auto-detect the installed tools using the PATH variable in the ENV construction variable and the platform name when the Environment is constructed. Changing the PATH variable after the Environment is constructed will not cause the tools to be redetected.

SCons supports the following tool specifications out of the box:

386asm

Sets construction variables for the 386ASM assembler for the Phar Lap ETS embedded operating system.

Sets: $AS, $ASCOM, $ASFLAGS, $ASPPCOM, $ASPPFLAGS.

Uses: $CC, $CPPFLAGS, $_CPPDEFFLAGS, $_CPPINCFLAGS.

aixc++

Sets construction variables for the IMB xlc / Visual Age C++ compiler.

Sets: $CXX, $CXXVERSION, $SHCXX, $SHOBJSUFFIX.

aixcc

Sets construction variables for the IBM xlc / Visual Age C compiler.

Sets: $CC, $CCVERSION, $SHCC.

aixf77

Sets construction variables for the IBM Visual Age f77 Fortran compiler.

Sets: $F77, $SHF77.

aixlink

Sets construction variables for the IBM Visual Age linker.

Sets: $LINKFLAGS, $SHLIBSUFFIX, $SHLINKFLAGS.

applelink

Sets construction variables for the Apple linker (similar to the GNU linker).

Sets: $FRAMEWORKPATHPREFIX, $LDMODULECOM, $LDMODULEFLAGS, $LDMODULEPREFIX, $LDMODULESUFFIX, $LINKCOM, $SHLINKCOM, $SHLINKFLAGS, $_FRAMEWORKPATH, $_FRAMEWORKS.

Uses: $FRAMEWORKSFLAGS.

ar

Sets construction variables for the ar library archiver.

Sets: $AR, $ARCOM, $ARFLAGS, $LIBPREFIX, $LIBSUFFIX, $RANLIB, $RANLIBCOM, $RANLIBFLAGS.

as

Sets construction variables for the as assembler.

Sets: $AS, $ASCOM, $ASFLAGS, $ASPPCOM, $ASPPFLAGS.

Uses: $CC, $CPPFLAGS, $_CPPDEFFLAGS, $_CPPINCFLAGS.

bcc32

Sets construction variables for the bcc32 compiler.

Sets: $CC, $CCCOM, $CCFLAGS, $CFILESUFFIX, $CFLAGS, $CPPDEFPREFIX, $CPPDEFSUFFIX, $INCPREFIX, $INCSUFFIX, $SHCC, $SHCCCOM, $SHCCFLAGS, $SHCFLAGS, $SHOBJSUFFIX.

Uses: $_CPPDEFFLAGS, $_CPPINCFLAGS.

BitKeeper

Sets construction variables for the BitKeeper source code control system.

Sets: $BITKEEPER, $BITKEEPERCOM, $BITKEEPERGET, $BITKEEPERGETFLAGS.

Uses: $BITKEEPERCOMSTR.

cc

Sets construction variables for generic POSIX C copmilers.

Sets: $CC, $CCCOM, $CCFLAGS, $CFILESUFFIX, $CFLAGS, $CPPDEFPREFIX, $CPPDEFSUFFIX, $FRAMEWORKPATH, $FRAMEWORKS, $INCPREFIX, $INCSUFFIX, $SHCC, $SHCCCOM, $SHCCFLAGS, $SHCFLAGS, $SHOBJSUFFIX.

Uses: $PLATFORM.

cvf

Sets construction variables for the Compaq Visual Fortran compiler.

Sets: $FORTRAN, $FORTRANCOM, $FORTRANMODDIR, $FORTRANMODDIRPREFIX, $FORTRANMODDIRSUFFIX, $FORTRANPPCOM, $OBJSUFFIX, $SHFORTRANCOM, $SHFORTRANPPCOM.

Uses: $CPPFLAGS, $FORTRANFLAGS, $SHFORTRANFLAGS, $_CPPDEFFLAGS, $_FORTRANINCFLAGS, $_FORTRANMODFLAG.

CVS

Sets construction variables for the CVS source code management system.

Sets: $CVS, $CVSCOFLAGS, $CVSCOM, $CVSFLAGS.

Uses: $CVSCOMSTR.

cXX

Sets construction variables for generic POSIX C++ compilers.

Sets: $CPPDEFPREFIX, $CPPDEFSUFFIX, $CXX, $CXXCOM, $CXXFILESUFFIX, $CXXFLAGS, $INCPREFIX, $INCSUFFIX, $OBJSUFFIX, $SHCXX, $SHCXXCOM, $SHCXXFLAGS, $SHOBJSUFFIX.

Uses: $CXXCOMSTR.

cyglink

Set construction variables for cygwin linker/loader.

Sets: $IMPLIBPREFIX, $IMPLIBSUFFIX, $LDMODULEVERSIONFLAGS, $LINKFLAGS, $RPATHPREFIX, $RPATHSUFFIX, $SHLIBPREFIX, $SHLIBSUFFIX, $SHLIBVERSIONFLAGS, $SHLINKCOM, $SHLINKFLAGS, $_LDMODULEVERSIONFLAGS, $_SHLIBVERSIONFLAGS.

default

Sets variables by calling a default list of Tool modules for the platform on which SCons is running.

dmd

Sets construction variables for D language compiler DMD.

Sets: $DC, $DCOM, $DDEBUG, $DDEBUGPREFIX, $DDEBUGSUFFIX, $DFILESUFFIX, $DFLAGPREFIX, $DFLAGS, $DFLAGSUFFIX, $DINCPREFIX, $DINCSUFFIX, $DLIB, $DLIBCOM, $DLIBDIRPREFIX, $DLIBDIRSUFFIX, $DLIBFLAGPREFIX, $DLIBFLAGSUFFIX, $DLIBLINKPREFIX, $DLIBLINKSUFFIX, $DLINK, $DLINKCOM, $DLINKFLAGS, $DPATH, $DVERPREFIX, $DVERSIONS, $DVERSUFFIX, $RPATHPREFIX, $RPATHSUFFIX, $SHDC, $SHDCOM, $SHDLINK, $SHDLINKCOM, $SHDLINKFLAGS, $_DDEBUGFLAGS, $_DFLAGS, $_DINCFLAGS, $_DLIBDIRFLAGS, $_DLIBFLAGS, $_DLIBFLAGS, $_DVERFLAGS, $_RPATH.

docbook

This tool tries to make working with Docbook in SCons a little easier. It provides several toolchains for creating different output formats, like HTML or PDF. Contained in the package is a distribution of the Docbook XSL stylesheets as of version 1.76.1. As long as you don't specify your own stylesheets for customization, these official versions are picked as default...which should reduce the inevitable setup hassles for you.

Implicit dependencies to images and XIncludes are detected automatically if you meet the HTML requirements. The additional stylesheet utils/xmldepend.xsl by Paul DuBois is used for this purpose.

Note, that there is no support for XML catalog resolving offered! This tool calls the XSLT processors and PDF renderers with the stylesheets you specified, that's it. The rest lies in your hands and you still have to know what you're doing when resolving names via a catalog.

For activating the tool "docbook", you have to add its name to the Environment constructor, like this

env = Environment(tools=['docbook'])

On its startup, the Docbook tool tries to find a required xsltproc processor, and a PDF renderer, e.g. fop. So make sure that these are added to your system's environment PATH and can be called directly, without specifying their full path.

For the most basic processing of Docbook to HTML, you need to have installed

* the Python lxml binding to libxml2, or

* the direct Python bindings for libxml2/libxslt, or

* a standalone XSLT processor, currently detected are xsltproc, saxon, saxon-xslt and xalan.

Rendering to PDF requires you to have one of the applications fop or xep installed.

Creating a HTML or PDF document is very simple and straightforward. Say

env = Environment(tools=['docbook'])
env.DocbookHtml('manual.html', 'manual.xml')
env.DocbookPdf('manual.pdf', 'manual.xml')

to get both outputs from your XML source manual.xml. As a shortcut, you can give the stem of the filenames alone, like this:

env = Environment(tools=['docbook'])
env.DocbookHtml('manual')
env.DocbookPdf('manual')

and get the same result. Target and source lists are also supported:

env = Environment(tools=['docbook'])
env.DocbookHtml(['manual.html','reference.html'], ['manual.xml','reference.xml'])

or even

env = Environment(tools=['docbook'])
env.DocbookHtml(['manual','reference'])

Important
Whenever you leave out the list of sources, you may not specify a file extension! The Tool uses the given names as file stems, and adds the suffixes for target and source files accordingly.

The rules given above are valid for the Builders DocbookHtml, DocbookPdf, DocbookEpub, DocbookSlidesPdf and DocbookXInclude. For the DocbookMan transformation you can specify a target name, but the actual output names are automatically set from the refname entries in your XML source.

The Builders DocbookHtmlChunked, DocbookHtmlhelp and DocbookSlidesHtml are special, in that:

1. they create a large set of files, where the exact names and their number depend on the content of the source file, and

2. the main target is always named index.html, i.e. the output name for the XSL transformation is not picked up by the stylesheets.

As a result, there is simply no use in specifying a target HTML name. So the basic syntax for these builders is always:

env = Environment(tools=['docbook'])
env.DocbookHtmlhelp('manual')

If you want to use a specific XSL file, you can set the additional xsl parameter to your Builder call as follows:

env.DocbookHtml('other.html', 'manual.xml', xsl='html.xsl')

Since this may get tedious if you always use the same local naming for your customized XSL files, e.g. html.xsl for HTML and pdf.xsl for PDF output, a set of variables for setting the default XSL name is provided. These are:

DOCBOOK_DEFAULT_XSL_HTML        
DOCBOOK_DEFAULT_XSL_HTMLCHUNKED        
DOCBOOK_DEFAULT_XSL_HTMLHELP        
DOCBOOK_DEFAULT_XSL_PDF        
DOCBOOK_DEFAULT_XSL_EPUB        
DOCBOOK_DEFAULT_XSL_MAN        
DOCBOOK_DEFAULT_XSL_SLIDESPDF        
DOCBOOK_DEFAULT_XSL_SLIDESHTML        

and you can set them when constructing your environment:

env = Environment(tools=['docbook'],
                  DOCBOOK_DEFAULT_XSL_HTML='html.xsl',
                  DOCBOOK_DEFAULT_XSL_PDF='pdf.xsl')
env.DocbookHtml('manual') # now uses html.xsl

Sets: $DOCBOOK_DEFAULT_XSL_EPUB, $DOCBOOK_DEFAULT_XSL_HTML, $DOCBOOK_DEFAULT_XSL_HTMLCHUNKED, $DOCBOOK_DEFAULT_XSL_HTMLHELP, $DOCBOOK_DEFAULT_XSL_MAN, $DOCBOOK_DEFAULT_XSL_PDF, $DOCBOOK_DEFAULT_XSL_SLIDESHTML, $DOCBOOK_DEFAULT_XSL_SLIDESPDF, $DOCBOOK_FOP, $DOCBOOK_FOPCOM, $DOCBOOK_FOPFLAGS, $DOCBOOK_XMLLINT, $DOCBOOK_XMLLINTCOM, $DOCBOOK_XMLLINTFLAGS, $DOCBOOK_XSLTPROC, $DOCBOOK_XSLTPROCCOM, $DOCBOOK_XSLTPROCFLAGS, $DOCBOOK_XSLTPROCPARAMS.

Uses: $DOCBOOK_FOPCOMSTR, $DOCBOOK_XMLLINTCOMSTR, $DOCBOOK_XSLTPROCCOMSTR.

dvi

Attaches the DVI builder to the construction environment.

dvipdf

Sets construction variables for the dvipdf utility.

Sets: $DVIPDF, $DVIPDFCOM, $DVIPDFFLAGS.

Uses: $DVIPDFCOMSTR.

dvips

Sets construction variables for the dvips utility.

Sets: $DVIPS, $DVIPSFLAGS, $PSCOM, $PSPREFIX, $PSSUFFIX.

Uses: $PSCOMSTR.

f03

Set construction variables for generic POSIX Fortran 03 compilers.

Sets: $F03, $F03COM, $F03FLAGS, $F03PPCOM, $SHF03, $SHF03COM, $SHF03FLAGS, $SHF03PPCOM, $_F03INCFLAGS.

Uses: $F03COMSTR, $F03PPCOMSTR, $SHF03COMSTR, $SHF03PPCOMSTR.

f08

Set construction variables for generic POSIX Fortran 08 compilers.

Sets: $F08, $F08COM, $F08FLAGS, $F08PPCOM, $SHF08, $SHF08COM, $SHF08FLAGS, $SHF08PPCOM, $_F08INCFLAGS.

Uses: $F08COMSTR, $F08PPCOMSTR, $SHF08COMSTR, $SHF08PPCOMSTR.

f77

Set construction variables for generic POSIX Fortran 77 compilers.

Sets: $F77, $F77COM, $F77FILESUFFIXES, $F77FLAGS, $F77PPCOM, $F77PPFILESUFFIXES, $FORTRAN, $FORTRANCOM, $FORTRANFLAGS, $SHF77, $SHF77COM, $SHF77FLAGS, $SHF77PPCOM, $SHFORTRAN, $SHFORTRANCOM, $SHFORTRANFLAGS, $SHFORTRANPPCOM, $_F77INCFLAGS.

Uses: $F77COMSTR, $F77PPCOMSTR, $FORTRANCOMSTR, $FORTRANPPCOMSTR, $SHF77COMSTR, $SHF77PPCOMSTR, $SHFORTRANCOMSTR, $SHFORTRANPPCOMSTR.

f90

Set construction variables for generic POSIX Fortran 90 compilers.

Sets: $F90, $F90COM, $F90FLAGS, $F90PPCOM, $SHF90, $SHF90COM, $SHF90FLAGS, $SHF90PPCOM, $_F90INCFLAGS.

Uses: $F90COMSTR, $F90PPCOMSTR, $SHF90COMSTR, $SHF90PPCOMSTR.

f95

Set construction variables for generic POSIX Fortran 95 compilers.

Sets: $F95, $F95COM, $F95FLAGS, $F95PPCOM, $SHF95, $SHF95COM, $SHF95FLAGS, $SHF95PPCOM, $_F95INCFLAGS.

Uses: $F95COMSTR, $F95PPCOMSTR, $SHF95COMSTR, $SHF95PPCOMSTR.

fortran

Set construction variables for generic POSIX Fortran compilers.

Sets: $FORTRAN, $FORTRANCOM, $FORTRANFLAGS, $SHFORTRAN, $SHFORTRANCOM, $SHFORTRANFLAGS, $SHFORTRANPPCOM.

Uses: $FORTRANCOMSTR, $FORTRANPPCOMSTR, $SHFORTRANCOMSTR, $SHFORTRANPPCOMSTR.

g++

Set construction variables for the gXX C++ compiler.

Sets: $CXX, $CXXVERSION, $SHCXXFLAGS, $SHOBJSUFFIX.

g77

Set construction variables for the g77 Fortran compiler. Calls the f77 Tool module to set variables.

gas

Sets construction variables for the gas assembler. Calls the as module.

Sets: $AS.

gcc

Set construction variables for the gcc C compiler.

Sets: $CC, $CCVERSION, $SHCCFLAGS.

gdc

Sets construction variables for the D language compiler GDC.

Sets: $DC, $DCOM, $DDEBUG, $DDEBUGPREFIX, $DDEBUGSUFFIX, $DFILESUFFIX, $DFLAGPREFIX, $DFLAGS, $DFLAGSUFFIX, $DINCPREFIX, $DINCSUFFIX, $DLIB, $DLIBCOM, $DLIBFLAGPREFIX, $DLIBFLAGSUFFIX, $DLINK, $DLINKCOM, $DLINKFLAGPREFIX, $DLINKFLAGS, $DLINKFLAGSUFFIX, $DPATH, $DVERPREFIX, $DVERSIONS, $DVERSUFFIX, $RPATHPREFIX, $RPATHSUFFIX, $SHDC, $SHDCOM, $SHDLINK, $SHDLINKCOM, $SHDLINKFLAGS, $_DDEBUGFLAGS, $_DFLAGS, $_DINCFLAGS, $_DLIBFLAGS, $_DVERFLAGS, $_RPATH.

gettext

This is actually a toolset, which supports internationalization and localization of software being constructed with SCons. The toolset loads following tools:

*

xgettext - to extract internationalized messages from source code to POT file(s),

*

msginit - may be optionally used to initialize PO files,

*

msgmerge - to update PO files, that already contain translated messages,

*

msgfmt - to compile textual PO file to binary installable MO file.

When you enable gettext, it internally loads all abovementioned tools, so you're encouraged to see their individual documentation.

Each of the above tools provides its own builder(s) which may be used to perform particular activities related to software internationalization. You may be however interested in top-level builder Translate described few paragraphs later.

To use gettext tools add 'gettext' tool to your environment:

  env = Environment( tools = ['default', 'gettext'] )

gfortran

Sets construction variables for the GNU F95/F2003 GNU compiler.

Sets: $F77, $F90, $F95, $FORTRAN, $SHF77, $SHF77FLAGS, $SHF90, $SHF90FLAGS, $SHF95, $SHF95FLAGS, $SHFORTRAN, $SHFORTRANFLAGS.

gnulink

Set construction variables for GNU linker/loader.

Sets: $LDMODULEVERSIONFLAGS, $RPATHPREFIX, $RPATHSUFFIX, $SHLIBVERSIONFLAGS, $SHLINKFLAGS, $_LDMODULESONAME, $_SHLIBSONAME.

gs

This Tool sets the required construction variables for working with the Ghostscript command. It also registers an appropriate Action with the PDF Builder (PDF), such that the conversion from PS/EPS to PDF happens automatically for the TeX/LaTeX toolchain. Finally, it adds an explicit Ghostscript Builder (Gs) to the environment.

Sets: $GS, $GSCOM, $GSFLAGS.

Uses: $GSCOMSTR.

hpc++

Set construction variables for the compilers aCC on HP/UX systems.

hpcc

Set construction variables for the aCC on HP/UX systems. Calls the cXX tool for additional variables.

Sets: $CXX, $CXXVERSION, $SHCXXFLAGS.

hplink

Sets construction variables for the linker on HP/UX systems.

Sets: $LINKFLAGS, $SHLIBSUFFIX, $SHLINKFLAGS.

icc

Sets construction variables for the icc compiler on OS/2 systems.

Sets: $CC, $CCCOM, $CFILESUFFIX, $CPPDEFPREFIX, $CPPDEFSUFFIX, $CXXCOM, $CXXFILESUFFIX, $INCPREFIX, $INCSUFFIX.

Uses: $CCFLAGS, $CFLAGS, $CPPFLAGS, $_CPPDEFFLAGS, $_CPPINCFLAGS.

icl

Sets construction variables for the Intel C/C++ compiler. Calls the intelc Tool module to set its variables.

ifl

Sets construction variables for the Intel Fortran compiler.

Sets: $FORTRAN, $FORTRANCOM, $FORTRANPPCOM, $SHFORTRANCOM, $SHFORTRANPPCOM.

Uses: $CPPFLAGS, $FORTRANFLAGS, $_CPPDEFFLAGS, $_FORTRANINCFLAGS.

ifort

Sets construction variables for newer versions of the Intel Fortran compiler for Linux.

Sets: $F77, $F90, $F95, $FORTRAN, $SHF77, $SHF77FLAGS, $SHF90, $SHF90FLAGS, $SHF95, $SHF95FLAGS, $SHFORTRAN, $SHFORTRANFLAGS.

ilink

Sets construction variables for the ilink linker on OS/2 systems.

Sets: $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $LINKFLAGS.

ilink32

Sets construction variables for the Borland ilink32 linker.

Sets: $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $LINKFLAGS.

install

Sets construction variables for file and directory installation.

Sets: $INSTALL, $INSTALLSTR.

intelc

Sets construction variables for the Intel C/C++ compiler (Linux and Windows, version 7 and later). Calls the gcc or msvc (on Linux and Windows, respectively) to set underlying variables.

Sets: $AR, $CC, $CXX, $INTEL_C_COMPILER_VERSION, $LINK.

jar

Sets construction variables for the jar utility.

Sets: $JAR, $JARCOM, $JARFLAGS, $JARSUFFIX.

Uses: $JARCOMSTR.

javac

Sets construction variables for the javac compiler.

Sets: $JAVABOOTCLASSPATH, $JAVAC, $JAVACCOM, $JAVACFLAGS, $JAVACLASSPATH, $JAVACLASSSUFFIX, $JAVASOURCEPATH, $JAVASUFFIX.

Uses: $JAVACCOMSTR.

javah

Sets construction variables for the javah tool.

Sets: $JAVACLASSSUFFIX, $JAVAH, $JAVAHCOM, $JAVAHFLAGS.

Uses: $JAVACLASSPATH, $JAVAHCOMSTR.

latex

Sets construction variables for the latex utility.

Sets: $LATEX, $LATEXCOM, $LATEXFLAGS.

Uses: $LATEXCOMSTR.

ldc

Sets construction variables for the D language compiler LDC2.

Sets: $DC, $DCOM, $DDEBUG, $DDEBUGPREFIX, $DDEBUGSUFFIX, $DFILESUFFIX, $DFLAGPREFIX, $DFLAGS, $DFLAGSUFFIX, $DINCPREFIX, $DINCSUFFIX, $DLIB, $DLIBCOM, $DLIBDIRPREFIX, $DLIBDIRSUFFIX, $DLIBFLAGPREFIX, $DLIBFLAGSUFFIX, $DLIBLINKPREFIX, $DLIBLINKSUFFIX, $DLINK, $DLINKCOM, $DLINKFLAGPREFIX, $DLINKFLAGS, $DLINKFLAGSUFFIX, $DPATH, $DVERPREFIX, $DVERSIONS, $DVERSUFFIX, $RPATHPREFIX, $RPATHSUFFIX, $SHDC, $SHDCOM, $SHDLINK, $SHDLINKCOM, $SHDLINKFLAGS, $_DDEBUGFLAGS, $_DFLAGS, $_DINCFLAGS, $_DLIBDIRFLAGS, $_DLIBFLAGS, $_DLIBFLAGS, $_DVERFLAGS, $_RPATH.

lex

Sets construction variables for the lex lexical analyser.

Sets: $LEX, $LEXCOM, $LEXFLAGS.

Uses: $LEXCOMSTR.

link

Sets construction variables for generic POSIX linkers.

Sets: $LDMODULE, $LDMODULECOM, $LDMODULEFLAGS, $LDMODULENOVERSIONSYMLINKS, $LDMODULEPREFIX, $LDMODULESUFFIX, $LDMODULEVERSION, $LDMODULEVERSIONFLAGS, $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $LINKFLAGS, $SHLIBSUFFIX, $SHLINK, $SHLINKCOM, $SHLINKFLAGS, $__LDMODULEVERSIONFLAGS, $__SHLIBVERSIONFLAGS.

Uses: $LDMODULECOMSTR, $LINKCOMSTR, $SHLINKCOMSTR.

linkloc

Sets construction variables for the LinkLoc linker for the Phar Lap ETS embedded operating system.

Sets: $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $LINKFLAGS, $SHLINK, $SHLINKCOM, $SHLINKFLAGS.

Uses: $LINKCOMSTR, $SHLINKCOMSTR.

m4

Sets construction variables for the m4 macro processor.

Sets: $M4, $M4COM, $M4FLAGS.

Uses: $M4COMSTR.

masm

Sets construction variables for the Microsoft assembler.

Sets: $AS, $ASCOM, $ASFLAGS, $ASPPCOM, $ASPPFLAGS.

Uses: $ASCOMSTR, $ASPPCOMSTR, $CPPFLAGS, $_CPPDEFFLAGS, $_CPPINCFLAGS.

midl

Sets construction variables for the Microsoft IDL compiler.

Sets: $MIDL, $MIDLCOM, $MIDLFLAGS.

Uses: $MIDLCOMSTR.

mingw

Sets construction variables for MinGW (Minimal Gnu on Windows).

Sets: $AS, $CC, $CXX, $LDMODULECOM, $LIBPREFIX, $LIBSUFFIX, $OBJSUFFIX, $RC, $RCCOM, $RCFLAGS, $RCINCFLAGS, $RCINCPREFIX, $RCINCSUFFIX, $SHCCFLAGS, $SHCXXFLAGS, $SHLINKCOM, $SHLINKFLAGS, $SHOBJSUFFIX, $WINDOWSDEFPREFIX, $WINDOWSDEFSUFFIX.

Uses: $RCCOMSTR, $SHLINKCOMSTR.

msgfmt

This scons tool is a part of scons gettext toolset. It provides scons interface to msgfmt(1) command, which generates binary message catalog (MO) from a textual translation description (PO).

Sets: $MOSUFFIX, $MSGFMT, $MSGFMTCOM, $MSGFMTCOMSTR, $MSGFMTFLAGS, $POSUFFIX.

Uses: $LINGUAS_FILE.

msginit

This scons tool is a part of scons gettext toolset. It provides scons interface to msginit(1) program, which creates new PO file, initializing the meta information with values from user's environment (or options).

Sets: $MSGINIT, $MSGINITCOM, $MSGINITCOMSTR, $MSGINITFLAGS, $POAUTOINIT, $POCREATE_ALIAS, $POSUFFIX, $POTSUFFIX, $_MSGINITLOCALE.

Uses: $LINGUAS_FILE, $POAUTOINIT, $POTDOMAIN.

msgmerge

This scons tool is a part of scons gettext toolset. It provides scons interface to msgmerge(1) command, which merges two Uniform style .po files together.

Sets: $MSGMERGE, $MSGMERGECOM, $MSGMERGECOMSTR, $MSGMERGEFLAGS, $POSUFFIX, $POTSUFFIX, $POUPDATE_ALIAS.

Uses: $LINGUAS_FILE, $POAUTOINIT, $POTDOMAIN.

mslib

Sets construction variables for the Microsoft mslib library archiver.

Sets: $AR, $ARCOM, $ARFLAGS, $LIBPREFIX, $LIBSUFFIX.

Uses: $ARCOMSTR.

mslink

Sets construction variables for the Microsoft linker.

Sets: $LDMODULE, $LDMODULECOM, $LDMODULEFLAGS, $LDMODULEPREFIX, $LDMODULESUFFIX, $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $LINKFLAGS, $REGSVR, $REGSVRCOM, $REGSVRFLAGS, $SHLINK, $SHLINKCOM, $SHLINKFLAGS, $WIN32DEFPREFIX, $WIN32DEFSUFFIX, $WIN32EXPPREFIX, $WIN32EXPSUFFIX, $WINDOWSDEFPREFIX, $WINDOWSDEFSUFFIX, $WINDOWSEXPPREFIX, $WINDOWSEXPSUFFIX, $WINDOWSPROGMANIFESTPREFIX, $WINDOWSPROGMANIFESTSUFFIX, $WINDOWSSHLIBMANIFESTPREFIX, $WINDOWSSHLIBMANIFESTSUFFIX, $WINDOWS_INSERT_DEF.

Uses: $LDMODULECOMSTR, $LINKCOMSTR, $REGSVRCOMSTR, $SHLINKCOMSTR.

mssdk

Sets variables for Microsoft Platform SDK and/or Windows SDK. Note that unlike most other Tool modules, mssdk does not set construction variables, but sets the environment variables in the environment SCons uses to execute the Microsoft toolchain: %INCLUDE%, %LIB%, %LIBPATH% and %PATH%.

Uses: $MSSDK_DIR, $MSSDK_VERSION, $MSVS_VERSION.

msvc

Sets construction variables for the Microsoft Visual C/C++ compiler.

Sets: $BUILDERS, $CC, $CCCOM, $CCFLAGS, $CCPCHFLAGS, $CCPDBFLAGS, $CFILESUFFIX, $CFLAGS, $CPPDEFPREFIX, $CPPDEFSUFFIX, $CXX, $CXXCOM, $CXXFILESUFFIX, $CXXFLAGS, $INCPREFIX, $INCSUFFIX, $OBJPREFIX, $OBJSUFFIX, $PCHCOM, $PCHPDBFLAGS, $RC, $RCCOM, $RCFLAGS, $SHCC, $SHCCCOM, $SHCCFLAGS, $SHCFLAGS, $SHCXX, $SHCXXCOM, $SHCXXFLAGS, $SHOBJPREFIX, $SHOBJSUFFIX.

Uses: $CCCOMSTR, $CXXCOMSTR, $PCH, $PCHSTOP, $PDB, $SHCCCOMSTR, $SHCXXCOMSTR.

msvs

Sets construction variables for Microsoft Visual Studio.

Sets: $MSVSBUILDCOM, $MSVSCLEANCOM, $MSVSENCODING, $MSVSPROJECTCOM, $MSVSREBUILDCOM, $MSVSSCONS, $MSVSSCONSCOM, $MSVSSCONSCRIPT, $MSVSSCONSFLAGS, $MSVSSOLUTIONCOM.

mwcc

Sets construction variables for the Metrowerks CodeWarrior compiler.

Sets: $CC, $CCCOM, $CFILESUFFIX, $CPPDEFPREFIX, $CPPDEFSUFFIX, $CXX, $CXXCOM, $CXXFILESUFFIX, $INCPREFIX, $INCSUFFIX, $MWCW_VERSION, $MWCW_VERSIONS, $SHCC, $SHCCCOM, $SHCCFLAGS, $SHCFLAGS, $SHCXX, $SHCXXCOM, $SHCXXFLAGS.

Uses: $CCCOMSTR, $CXXCOMSTR, $SHCCCOMSTR, $SHCXXCOMSTR.

mwld

Sets construction variables for the Metrowerks CodeWarrior linker.

Sets: $AR, $ARCOM, $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $SHLINK, $SHLINKCOM, $SHLINKFLAGS.

nasm

Sets construction variables for the nasm Netwide Assembler.

Sets: $AS, $ASCOM, $ASFLAGS, $ASPPCOM, $ASPPFLAGS.

Uses: $ASCOMSTR, $ASPPCOMSTR.

packaging

A framework for building binary and source packages.

Packaging

Sets construction variables for the Package Builder.

pdf

Sets construction variables for the Portable Document Format builder.

Sets: $PDFPREFIX, $PDFSUFFIX.

pdflatex

Sets construction variables for the pdflatex utility.

Sets: $LATEXRETRIES, $PDFLATEX, $PDFLATEXCOM, $PDFLATEXFLAGS.

Uses: $PDFLATEXCOMSTR.

pdftex

Sets construction variables for the pdftex utility.

Sets: $LATEXRETRIES, $PDFLATEX, $PDFLATEXCOM, $PDFLATEXFLAGS, $PDFTEX, $PDFTEXCOM, $PDFTEXFLAGS.

Uses: $PDFLATEXCOMSTR, $PDFTEXCOMSTR.

Perforce

Sets construction variables for interacting with the Perforce source code management system.

Sets: $P4, $P4COM, $P4FLAGS.

Uses: $P4COMSTR.

qt

Sets construction variables for building Qt applications.

Sets: $QTDIR, $QT_AUTOSCAN, $QT_BINPATH, $QT_CPPPATH, $QT_LIB, $QT_LIBPATH, $QT_MOC, $QT_MOCCXXPREFIX, $QT_MOCCXXSUFFIX, $QT_MOCFROMCXXCOM, $QT_MOCFROMCXXFLAGS, $QT_MOCFROMHCOM, $QT_MOCFROMHFLAGS, $QT_MOCHPREFIX, $QT_MOCHSUFFIX, $QT_UIC, $QT_UICCOM, $QT_UICDECLFLAGS, $QT_UICDECLPREFIX, $QT_UICDECLSUFFIX, $QT_UICIMPLFLAGS, $QT_UICIMPLPREFIX, $QT_UICIMPLSUFFIX, $QT_UISUFFIX.

RCS

Sets construction variables for the interaction with the Revision Control System.

Sets: $RCS, $RCS_CO, $RCS_COCOM, $RCS_COFLAGS.

Uses: $RCS_COCOMSTR.

rmic

Sets construction variables for the rmic utility.

Sets: $JAVACLASSSUFFIX, $RMIC, $RMICCOM, $RMICFLAGS.

Uses: $RMICCOMSTR.

rpcgen

Sets construction variables for building with RPCGEN.

Sets: $RPCGEN, $RPCGENCLIENTFLAGS, $RPCGENFLAGS, $RPCGENHEADERFLAGS, $RPCGENSERVICEFLAGS, $RPCGENXDRFLAGS.

SCCS

Sets construction variables for interacting with the Source Code Control System.

Sets: $SCCS, $SCCSCOM, $SCCSFLAGS, $SCCSGETFLAGS.

Uses: $SCCSCOMSTR.

sgiar

Sets construction variables for the SGI library archiver.

Sets: $AR, $ARCOMSTR, $ARFLAGS, $LIBPREFIX, $LIBSUFFIX, $SHLINK, $SHLINKFLAGS.

Uses: $ARCOMSTR, $SHLINKCOMSTR.

sgic++

Sets construction variables for the SGI C++ compiler.

Sets: $CXX, $CXXFLAGS, $SHCXX, $SHOBJSUFFIX.

sgicc

Sets construction variables for the SGI C compiler.

Sets: $CXX, $SHOBJSUFFIX.

sgilink

Sets construction variables for the SGI linker.

Sets: $LINK, $RPATHPREFIX, $RPATHSUFFIX, $SHLINKFLAGS.

sunar

Sets construction variables for the Sun library archiver.

Sets: $AR, $ARCOM, $ARFLAGS, $LIBPREFIX, $LIBSUFFIX.

Uses: $ARCOMSTR.

sunc++

Sets construction variables for the Sun C++ compiler.

Sets: $CXX, $CXXVERSION, $SHCXX, $SHCXXFLAGS, $SHOBJPREFIX, $SHOBJSUFFIX.

suncc

Sets construction variables for the Sun C compiler.

Sets: $CXX, $SHCCFLAGS, $SHOBJPREFIX, $SHOBJSUFFIX.

sunf77

Set construction variables for the Sun f77 Fortran compiler.

Sets: $F77, $FORTRAN, $SHF77, $SHF77FLAGS, $SHFORTRAN, $SHFORTRANFLAGS.

sunf90

Set construction variables for the Sun f90 Fortran compiler.

Sets: $F90, $FORTRAN, $SHF90, $SHF90FLAGS, $SHFORTRAN, $SHFORTRANFLAGS.

sunf95

Set construction variables for the Sun f95 Fortran compiler.

Sets: $F95, $FORTRAN, $SHF95, $SHF95FLAGS, $SHFORTRAN, $SHFORTRANFLAGS.

sunlink

Sets construction variables for the Sun linker.

Sets: $RPATHPREFIX, $RPATHSUFFIX, $SHLINKFLAGS.

swig

Sets construction variables for the SWIG interface generator.

Sets: $SWIG, $SWIGCFILESUFFIX, $SWIGCOM, $SWIGCXXFILESUFFIX, $SWIGDIRECTORSUFFIX, $SWIGFLAGS, $SWIGINCPREFIX, $SWIGINCSUFFIX, $SWIGPATH, $SWIGVERSION, $_SWIGINCFLAGS.

Uses: $SWIGCOMSTR.

tar

Sets construction variables for the tar archiver.

Sets: $TAR, $TARCOM, $TARFLAGS, $TARSUFFIX.

Uses: $TARCOMSTR.

tex

Sets construction variables for the TeX formatter and typesetter.

Sets: $BIBTEX, $BIBTEXCOM, $BIBTEXFLAGS, $LATEX, $LATEXCOM, $LATEXFLAGS, $MAKEINDEX, $MAKEINDEXCOM, $MAKEINDEXFLAGS, $TEX, $TEXCOM, $TEXFLAGS.

Uses: $BIBTEXCOMSTR, $LATEXCOMSTR, $MAKEINDEXCOMSTR, $TEXCOMSTR.

textfile

Set construction variables for the Textfile and Substfile builders.

Sets: $LINESEPARATOR, $SUBSTFILEPREFIX, $SUBSTFILESUFFIX, $TEXTFILEPREFIX, $TEXTFILESUFFIX.

Uses: $SUBST_DICT.

tlib

Sets construction variables for the Borlan tib library archiver.

Sets: $AR, $ARCOM, $ARFLAGS, $LIBPREFIX, $LIBSUFFIX.

Uses: $ARCOMSTR.

xgettext

This scons tool is a part of scons gettext toolset. It provides scons interface to xgettext(1) program, which extracts internationalized messages from source code. The tool provides POTUpdate builder to make PO Template files.

Sets: $POTSUFFIX, $POTUPDATE_ALIAS, $XGETTEXTCOM, $XGETTEXTCOMSTR, $XGETTEXTFLAGS, $XGETTEXTFROM, $XGETTEXTFROMPREFIX, $XGETTEXTFROMSUFFIX, $XGETTEXTPATH, $XGETTEXTPATHPREFIX, $XGETTEXTPATHSUFFIX, $_XGETTEXTDOMAIN, $_XGETTEXTFROMFLAGS, $_XGETTEXTPATHFLAGS.

Uses: $POTDOMAIN.

yacc

Sets construction variables for the yacc parse generator.

Sets: $YACC, $YACCCOM, $YACCFLAGS, $YACCHFILESUFFIX, $YACCHXXFILESUFFIX, $YACCVCGFILESUFFIX.

Uses: $YACCCOMSTR.

zip

Sets construction variables for the zip archiver.

Sets: $ZIP, $ZIPCOM, $ZIPCOMPRESSION, $ZIPFLAGS, $ZIPSUFFIX.

Uses: $ZIPCOMSTR.

Additionally, there is a "tool" named default which configures the environment with a default set of tools for the current platform.

On posix and cygwin platforms the GNU tools (e.g. gcc) are preferred by SCons, on Windows the Microsoft tools (e.g. msvc) followed by MinGW are preferred by SCons, and in OS/2 the IBM tools (e.g. icc) are preferred by SCons.  

Builder Methods

Build rules are specified by calling a construction environment's builder methods. The arguments to the builder methods are target (a list of targets to be built, usually file names) and source (a list of sources to be built, usually file names).

Because long lists of file names can lead to a lot of quoting, scons supplies a Split() global function and a same-named environment method that split a single string into a list, separated on strings of white-space characters. (These are similar to the split() member function of Python strings but work even if the input isn't a string.)

Like all Python arguments, the target and source arguments to a builder method can be specified either with or without the "target" and "source" keywords. When the keywords are omitted, the target is first, followed by the source. The following are equivalent examples of calling the Program builder method:

env.Program('bar', ['bar.c', 'foo.c'])
env.Program('bar', Split('bar.c foo.c'))
env.Program('bar', env.Split('bar.c foo.c'))
env.Program(source =  ['bar.c', 'foo.c'], target = 'bar')
env.Program(target = 'bar', Split('bar.c foo.c'))
env.Program(target = 'bar', env.Split('bar.c foo.c'))
env.Program('bar', source = 'bar.c foo.c'.split())

Target and source file names that are not absolute path names (that is, do not begin with / on POSIX systems or \fR on Windows systems, with or without an optional drive letter) are interpreted relative to the directory containing the SConscript file being read. An initial # (hash mark) on a path name means that the rest of the file name is interpreted relative to the directory containing the top-level SConstruct file, even if the # is followed by a directory separator character (slash or backslash).

Examples:

# The comments describing the targets that will be built
# assume these calls are in a SConscript file in the
# a subdirectory named "subdir".

# Builds the program "subdir/foo" from "subdir/foo.c":
env.Program('foo', 'foo.c')

# Builds the program "/tmp/bar" from "subdir/bar.c":
env.Program('/tmp/bar', 'bar.c')

# An initial '#' or '#/' are equivalent; the following
# calls build the programs "foo" and "bar" (in the
# top-level SConstruct directory) from "subdir/foo.c" and
# "subdir/bar.c", respectively:
env.Program('#foo', 'foo.c')
env.Program('#/bar', 'bar.c')

# Builds the program "other/foo" (relative to the top-level
# SConstruct directory) from "subdir/foo.c":
env.Program('#other/foo', 'foo.c')

When the target shares the same base name as the source and only the suffix varies, and if the builder method has a suffix defined for the target file type, then the target argument may be omitted completely, and scons will deduce the target file name from the source file name. The following examples all build the executable program bar (on POSIX systems) or bar.exe (on Windows systems) from the bar.c source file:

env.Program(target = 'bar', source = 'bar.c')
env.Program('bar', source = 'bar.c')
env.Program(source = 'bar.c')
env.Program('bar.c')

As a convenience, a srcdir keyword argument may be specified when calling a Builder. When specified, all source file strings that are not absolute paths will be interpreted relative to the specified srcdir. The following example will build the build/prog (or build/prog.exe on Windows) program from the files src/f1.c and src/f2.c:

env.Program('build/prog', ['f1.c', 'f2.c'], srcdir='src')

It is possible to override or add construction variables when calling a builder method by passing additional keyword arguments. These overridden or added variables will only be in effect when building the target, so they will not affect other parts of the build. For example, if you want to add additional libraries for just one program:

env.Program('hello', 'hello.c', LIBS=['gl', 'glut'])

or generate a shared library with a non-standard suffix:

env.SharedLibrary('word', 'word.cpp',
                  SHLIBSUFFIX='.ocx',
                  LIBSUFFIXES=['.ocx'])

(Note that both the $SHLIBSUFFIX and $LIBSUFFIXES variables must be set if you want SCons to search automatically for dependencies on the non-standard library names; see the descriptions of these variables, below, for more information.)

It is also possible to use the parse_flags keyword argument in an override:

env = Program('hello', 'hello.c', parse_flags = '-Iinclude -DEBUG -lm')

This example adds 'include' to CPPPATH, 'EBUG' to CPPDEFINES, and 'm' to LIBS.

Although the builder methods defined by scons are, in fact, methods of a construction environment object, they may also be called without an explicit environment:

Program('hello', 'hello.c')
SharedLibrary('word', 'word.cpp')

In this case, the methods are called internally using a default construction environment that consists of the tools and values that scons has determined are appropriate for the local system.

Builder methods that can be called without an explicit environment may be called from custom Python modules that you import into an SConscript file by adding the following to the Python module:

from SCons.Script import *

All builder methods return a list-like object containing Nodes that represent the target or targets that will be built. A Node is an internal SCons object which represents build targets or sources.

The returned Node-list object can be passed to other builder methods as source(s) or passed to any SCons function or method where a filename would normally be accepted. For example, if it were necessary to add a specific -D flag when compiling one specific object file:

bar_obj_list = env.StaticObject('bar.c', CPPDEFINES='-DBAR')
env.Program(source = ['foo.c', bar_obj_list, 'main.c'])

Using a Node in this way makes for a more portable build by avoiding having to specify a platform-specific object suffix when calling the Program() builder method.

Note that Builder calls will automatically "flatten" the source and target file lists, so it's all right to have the bar_obj list return by the StaticObject() call in the middle of the source file list. If you need to manipulate a list of lists returned by Builders directly using Python, you can either build the list by hand:

foo = Object('foo.c')
bar = Object('bar.c')
objects = ['begin.o'] + foo + ['middle.o'] + bar + ['end.o']
for object in objects:
    print str(object)

Or you can use the Flatten() function supplied by scons to create a list containing just the Nodes, which may be more convenient:

foo = Object('foo.c')
bar = Object('bar.c')
objects = Flatten(['begin.o', foo, 'middle.o', bar, 'end.o'])
for object in objects:
    print str(object)

Note also that because Builder calls return a list-like object, not an actual Python list, you should not use the Python += operator to append Builder results to a Python list. Because the list and the object are different types, Python will not update the original list in place, but will instead create a new Node-list object containing the concatenation of the list elements and the Builder results. This will cause problems for any other Python variables in your SCons configuration that still hold on to a reference to the original list. Instead, use the Python .extend() method to make sure the list is updated in-place. Example:

object_files = []

# Do NOT use += as follows:
#
#    object_files += Object('bar.c')
#
# It will not update the object_files list in place.
#
# Instead, use the .extend() method:
object_files.extend(Object('bar.c'))

The path name for a Node's file may be used by passing the Node to the Python-builtin str() function:

bar_obj_list = env.StaticObject('bar.c', CPPDEFINES='-DBAR')
print "The path to bar_obj is:", str(bar_obj_list[0])

Note again that because the Builder call returns a list, we have to access the first element in the list (bar_obj_list[0]) to get at the Node that actually represents the object file.

Builder calls support a chdir keyword argument that specifies that the Builder's action(s) should be executed after changing directory. If the chdir argument is a string or a directory Node, scons will change to the specified directory. If the chdir is not a string or Node and is non-zero, then scons will change to the target file's directory.

# scons will change to the "sub" subdirectory
# before executing the "cp" command.
env.Command('sub/dir/foo.out', 'sub/dir/foo.in',
            "cp dir/foo.in dir/foo.out",
            chdir='sub')

# Because chdir is not a string, scons will change to the
# target's directory ("sub/dir") before executing the
# "cp" command.
env.Command('sub/dir/foo.out', 'sub/dir/foo.in',
            "cp foo.in foo.out",
            chdir=1)

Note that scons will not automatically modify its expansion of construction variables like $TARGET and $SOURCE when using the chdir keyword argument--that is, the expanded file names will still be relative to the top-level SConstruct directory, and consequently incorrect relative to the chdir directory. If you use the chdir keyword argument, you will typically need to supply a different command line using expansions like ${TARGET.file} and ${SOURCE.file} to use just the filename portion of the targets and source.

scons provides the following builder methods:

CFile(), env.CFile()

Builds a C source file given a lex (.l) or yacc (.y) input file. The suffix specified by the $CFILESUFFIX construction variable (.c by default) is automatically added to the target if it is not already present. Example:

# builds foo.c
env.CFile(target = 'foo.c', source = 'foo.l')
# builds bar.c
env.CFile(target = 'bar', source = 'bar.y')

Command(), env.Command()

The Command "Builder" is actually implemented as a function that looks like a Builder, but actually takes an additional argument of the action from which the Builder should be made. See the Command function description for the calling syntax and details.

CXXFile(), env.CXXFile()

Builds a C++ source file given a lex (.ll) or yacc (.yy) input file. The suffix specified by the $CXXFILESUFFIX construction variable (.cc by default) is automatically added to the target if it is not already present. Example:

# builds foo.cc
env.CXXFile(target = 'foo.cc', source = 'foo.ll')
# builds bar.cc
env.CXXFile(target = 'bar', source = 'bar.yy')

DocbookEpub(), env.DocbookEpub()

A pseudo-Builder, providing a Docbook toolchain for EPUB output.

env = Environment(tools=['docbook'])
env.DocbookEpub('manual.epub', 'manual.xml')

or simply

env = Environment(tools=['docbook'])
env.DocbookEpub('manual')

DocbookHtml(), env.DocbookHtml()

A pseudo-Builder, providing a Docbook toolchain for HTML output.

env = Environment(tools=['docbook'])
env.DocbookHtml('manual.html', 'manual.xml')

or simply

env = Environment(tools=['docbook'])
env.DocbookHtml('manual')

DocbookHtmlChunked(), env.DocbookHtmlChunked()

A pseudo-Builder, providing a Docbook toolchain for chunked HTML output. It supports the base.dir parameter. The chunkfast.xsl file (requires "EXSLT") is used as the default stylesheet. Basic syntax:

env = Environment(tools=['docbook'])
env.DocbookHtmlChunked('manual')

where manual.xml is the input file.

If you use the root.filename parameter in your own stylesheets you have to specify the new target name. This ensures that the dependencies get correct, especially for the cleanup via lqscons -crq:

env = Environment(tools=['docbook'])
env.DocbookHtmlChunked('mymanual.html', 'manual', xsl='htmlchunk.xsl')

Some basic support for the base.dir is provided. You can add the base_dir keyword to your Builder call, and the given prefix gets prepended to all the created filenames:

env = Environment(tools=['docbook'])
env.DocbookHtmlChunked('manual', xsl='htmlchunk.xsl', base_dir='output/')

Make sure that you don't forget the trailing slash for the base folder, else your files get renamed only!

DocbookHtmlhelp(), env.DocbookHtmlhelp()

A pseudo-Builder, providing a Docbook toolchain for HTMLHELP output. Its basic syntax is:

env = Environment(tools=['docbook'])
env.DocbookHtmlhelp('manual')

where manual.xml is the input file.

If you use the root.filename parameter in your own stylesheets you have to specify the new target name. This ensures that the dependencies get correct, especially for the cleanup via lqscons -crq:

env = Environment(tools=['docbook'])
env.DocbookHtmlhelp('mymanual.html', 'manual', xsl='htmlhelp.xsl')

Some basic support for the base.dir parameter is provided. You can add the base_dir keyword to your Builder call, and the given prefix gets prepended to all the created filenames:

env = Environment(tools=['docbook'])
env.DocbookHtmlhelp('manual', xsl='htmlhelp.xsl', base_dir='output/')

Make sure that you don't forget the trailing slash for the base folder, else your files get renamed only!

DocbookMan(), env.DocbookMan()

A pseudo-Builder, providing a Docbook toolchain for Man page output. Its basic syntax is:

env = Environment(tools=['docbook'])
env.DocbookMan('manual')

where manual.xml is the input file. Note, that you can specify a target name, but the actual output names are automatically set from the refname entries in your XML source.

DocbookPdf(), env.DocbookPdf()

A pseudo-Builder, providing a Docbook toolchain for PDF output.

env = Environment(tools=['docbook'])
env.DocbookPdf('manual.pdf', 'manual.xml')

or simply

env = Environment(tools=['docbook'])
env.DocbookPdf('manual')

DocbookSlidesHtml(), env.DocbookSlidesHtml()

A pseudo-Builder, providing a Docbook toolchain for HTML slides output.

env = Environment(tools=['docbook'])
env.DocbookSlidesHtml('manual')

If you use the titlefoil.html parameter in your own stylesheets you have to give the new target name. This ensures that the dependencies get correct, especially for the cleanup via lqscons -crq:

env = Environment(tools=['docbook'])
env.DocbookSlidesHtml('mymanual.html','manual', xsl='slideshtml.xsl')

Some basic support for the base.dir parameter is provided. You can add the base_dir keyword to your Builder call, and the given prefix gets prepended to all the created filenames:

env = Environment(tools=['docbook'])
env.DocbookSlidesHtml('manual', xsl='slideshtml.xsl', base_dir='output/')

Make sure that you don't forget the trailing slash for the base folder, else your files get renamed only!

DocbookSlidesPdf(), env.DocbookSlidesPdf()

A pseudo-Builder, providing a Docbook toolchain for PDF slides output.

env = Environment(tools=['docbook'])
env.DocbookSlidesPdf('manual.pdf', 'manual.xml')

or simply

env = Environment(tools=['docbook'])
env.DocbookSlidesPdf('manual')

DocbookXInclude(), env.DocbookXInclude()

A pseudo-Builder, for resolving XIncludes in a separate processing step.

env = Environment(tools=['docbook'])
env.DocbookXInclude('manual_xincluded.xml', 'manual.xml')

DocbookXslt(), env.DocbookXslt()

A pseudo-Builder, applying a given XSL transformation to the input file.

env = Environment(tools=['docbook'])
env.DocbookXslt('manual_transformed.xml', 'manual.xml', xsl='transform.xslt')

Note, that this builder requires the xsl parameter to be set.

DVI(), env.DVI()

Builds a .dvi file from a .tex, .ltx or .latex input file. If the source file suffix is .tex, scons will examine the contents of the file; if the string \documentclass or \documentstyle is found, the file is assumed to be a LaTeX file and the target is built by invoking the $LATEXCOM command line; otherwise, the $TEXCOM command line is used. If the file is a LaTeX file, the DVI builder method will also examine the contents of the .aux file and invoke the $BIBTEX command line if the string bibdata is found, start $MAKEINDEX to generate an index if a .ind file is found and will examine the contents .log file and re-run the $LATEXCOM command if the log file says it is necessary.

The suffix .dvi (hard-coded within TeX itself) is automatically added to the target if it is not already present. Examples:

# builds from aaa.tex
env.DVI(target = 'aaa.dvi', source = 'aaa.tex')
# builds bbb.dvi
env.DVI(target = 'bbb', source = 'bbb.ltx')
# builds from ccc.latex
env.DVI(target = 'ccc.dvi', source = 'ccc.latex')

Gs(), env.Gs()

A Builder for explicitly calling the gs executable. Depending on the underlying OS, the different names gs, gsos2 and gswin32c are tried.

env = Environment(tools=['gs'])
env.Gs('cover.jpg','scons-scons.pdf',
       GSFLAGS='-dNOPAUSE -dBATCH -sDEVICE=jpeg -dFirstPage=1 -dLastPage=1 -q') 
       )

Install(), env.Install()

Installs one or more source files or directories in the specified target, which must be a directory. The names of the specified source files or directories remain the same within the destination directory. The sources may be given as a string or as a node returned by a builder.

env.Install('/usr/local/bin', source = ['foo', 'bar'])

InstallAs(), env.InstallAs()

Installs one or more source files or directories to specific names, allowing changing a file or directory name as part of the installation. It is an error if the target and source arguments list different numbers of files or directories.

env.InstallAs(target = '/usr/local/bin/foo',
              source = 'foo_debug')
env.InstallAs(target = ['../lib/libfoo.a', '../lib/libbar.a'],
              source = ['libFOO.a', 'libBAR.a'])

InstallVersionedLib(), env.InstallVersionedLib()

Installs a versioned shared library. The symlinks appropriate to the architecture will be generated based on symlinks of the source library.

env.InstallVersionedLib(target = '/usr/local/bin/foo',
              source = 'libxyz.1.5.2.so')

Jar(), env.Jar()

Builds a Java archive (.jar) file from the specified list of sources. Any directories in the source list will be searched for .class files). Any .java files in the source list will be compiled to .class files by calling the Java Builder.

If the $JARCHDIR value is set, the jar command will change to the specified directory using the -C option. If $JARCHDIR is not set explicitly, SCons will use the top of any subdirectory tree in which Java .class were built by the Java Builder.

If the contents any of the source files begin with the string Manifest-Version, the file is assumed to be a manifest and is passed to the jar command with the m option set.

env.Jar(target = 'foo.jar', source = 'classes')

env.Jar(target = 'bar.jar',
        source = ['bar1.java', 'bar2.java'])

Java(), env.Java()

Builds one or more Java class files. The sources may be any combination of explicit .java files, or directory trees which will be scanned for .java files.

SCons will parse each source .java file to find the classes (including inner classes) defined within that file, and from that figure out the target .class files that will be created. The class files will be placed underneath the specified target directory.

SCons will also search each Java file for the Java package name, which it assumes can be found on a line beginning with the string package in the first column; the resulting .class files will be placed in a directory reflecting the specified package name. For example, the file Foo.java defining a single public Foo class and containing a package name of sub.dir will generate a corresponding sub/dir/Foo.class class file.

Examples:

env.Java(target = 'classes', source = 'src')
env.Java(target = 'classes', source = ['src1', 'src2'])
env.Java(target = 'classes', source = ['File1.java', 'File2.java'])

Java source files can use the native encoding for the underlying OS. Since SCons compiles in simple ASCII mode by default, the compiler will generate warnings about unmappable characters, which may lead to errors as the file is processed further. In this case, the user must specify the LANG environment variable to tell the compiler what encoding is used. For portibility, it's best if the encoding is hard-coded so that the compile will work if it is done on a system with a different encoding.

env = Environment()
env['ENV']['LANG'] = 'en_GB.UTF-8'

JavaH(), env.JavaH()

Builds C header and source files for implementing Java native methods. The target can be either a directory in which the header files will be written, or a header file name which will contain all of the definitions. The source can be the names of .class files, the names of .java files to be compiled into .class files by calling the Java builder method, or the objects returned from the Java builder method.

If the construction variable $JAVACLASSDIR is set, either in the environment or in the call to the JavaH builder method itself, then the value of the variable will be stripped from the beginning of any .class file names.

Examples:

# builds java_native.h
classes = env.Java(target = 'classdir', source = 'src')
env.JavaH(target = 'java_native.h', source = classes)

# builds include/package_foo.h and include/package_bar.h
env.JavaH(target = 'include',
          source = ['package/foo.class', 'package/bar.class'])

# builds export/foo.h and export/bar.h
env.JavaH(target = 'export',
          source = ['classes/foo.class', 'classes/bar.class'],
          JAVACLASSDIR = 'classes')

Library(), env.Library()

A synonym for the StaticLibrary builder method.

LoadableModule(), env.LoadableModule()

On most systems, this is the same as SharedLibrary. On Mac OS X (Darwin) platforms, this creates a loadable module bundle.

M4(), env.M4()

Builds an output file from an M4 input file. This uses a default $M4FLAGS value of -E, which considers all warnings to be fatal and stops on the first warning when using the GNU version of m4. Example:

env.M4(target = 'foo.c', source = 'foo.c.m4')

Moc(), env.Moc()

Builds an output file from a moc input file. Moc input files are either header files or cxx files. This builder is only available after using the tool 'qt'. See the $QTDIR variable for more information. Example:

env.Moc('foo.h') # generates moc_foo.cc
env.Moc('foo.cpp') # generates foo.moc

MOFiles(), env.MOFiles()

This builder belongs to msgfmt tool. The builder compiles PO files to MO files.

Example 1. Create pl.mo and en.mo by compiling pl.po and en.po:

  # ...
  env.MOFiles(['pl', 'en'])

Example 2. Compile files for languages defined in LINGUAS file:

  # ...
  env.MOFiles(LINGUAS_FILE = 1)

Example 3. Create pl.mo and en.mo by compiling pl.po and en.po plus files for languages defined in LINGUAS file:

  # ...
  env.MOFiles(['pl', 'en'], LINGUAS_FILE = 1)

Example 4. Compile files for languages defined in LINGUAS file (another version):

  # ...
  env['LINGUAS_FILE'] = 1
  env.MOFiles()

MSVSProject(), env.MSVSProject()

Builds a Microsoft Visual Studio project file, and by default builds a solution file as well.

This builds a Visual Studio project file, based on the version of Visual Studio that is configured (either the latest installed version, or the version specified by $MSVS_VERSION in the Environment constructor). For Visual Studio 6, it will generate a .dsp file. For Visual Studio 7 (.NET) and later versions, it will generate a .vcproj file.

By default, this also generates a solution file for the specified project, a .dsw file for Visual Studio 6 or a .sln file for Visual Studio 7 (.NET). This behavior may be disabled by specifying auto_build_solution=0 when you call MSVSProject, in which case you presumably want to build the solution file(s) by calling the MSVSSolution Builder (see below).

The MSVSProject builder takes several lists of filenames to be placed into the project file. These are currently limited to srcs, incs, localincs, resources, and misc. These are pretty self-explanatory, but it should be noted that these lists are added to the $SOURCES construction variable as strings, NOT as SCons File Nodes. This is because they represent file names to be added to the project file, not the source files used to build the project file.

The above filename lists are all optional, although at least one must be specified for the resulting project file to be non-empty.

In addition to the above lists of values, the following values may be specified:

target

The name of the target .dsp or .vcproj file. The correct suffix for the version of Visual Studio must be used, but the $MSVSPROJECTSUFFIX construction variable will be defined to the correct value (see example below).

variant

The name of this particular variant. For Visual Studio 7 projects, this can also be a list of variant names. These are typically things like "Debug" or "Release", but really can be anything you want. For Visual Studio 7 projects, they may also specify a target platform separated from the variant name by a | (vertical pipe) character: Debug|Xbox. The default target platform is Win32. Multiple calls to MSVSProject with different variants are allowed; all variants will be added to the project file with their appropriate build targets and sources.

cmdargs

Additional command line arguments for the different variants. The number of cmdargs entries must match the number of variant entries, or be empty (not specified). If you give only one, it will automatically be propagated to all variants.

buildtarget

An optional string, node, or list of strings or nodes (one per build variant), to tell the Visual Studio debugger what output target to use in what build variant. The number of buildtarget entries must match the number of variant entries.

runfile

The name of the file that Visual Studio 7 and later will run and debug. This appears as the value of the Output field in the resulting Visual Studio project file. If this is not specified, the default is the same as the specified buildtarget value.

Note that because SCons always executes its build commands from the directory in which the SConstruct file is located, if you generate a project file in a different directory than the SConstruct directory, users will not be able to double-click on the file name in compilation error messages displayed in the Visual Studio console output window. This can be remedied by adding the Visual C/C++ /FC compiler option to the $CCFLAGS variable so that the compiler will print the full path name of any files that cause compilation errors.

Example usage:

barsrcs = ['bar.cpp'],
barincs = ['bar.h'],
barlocalincs = ['StdAfx.h']
barresources = ['bar.rc','resource.h']
barmisc = ['bar_readme.txt']

dll = env.SharedLibrary(target = 'bar.dll',
                        source = barsrcs)

env.MSVSProject(target = 'Bar' + env['MSVSPROJECTSUFFIX'],
                srcs = barsrcs,
                incs = barincs,
                localincs = barlocalincs,
                resources = barresources,
                misc = barmisc,
                buildtarget = dll,
                variant = 'Release')

Starting with version 2.4 of SCons it's also possible to specify the optional argument DebugSettings, which creates files for debugging under Visual Studio:

DebugSettings

A dictionary of debug settings that get written to the .vcproj.user or the .vcxproj.user file, depending on the version installed. As it is done for cmdargs (see above), you can specify a DebugSettings dictionary per variant. If you give only one, it will be propagated to all variants.

Currently, only Visual Studio v9.0 and Visual Studio version v11 are implemented, for other versions no file is generated. To generate the user file, you just need to add a DebugSettings dictionary to the environment with the right parameters for your MSVS version. If the dictionary is empty, or does not contain any good value, no file will be generated.

Following is a more contrived example, involving the setup of a project for variants and DebugSettings:

# Assuming you store your defaults in a file
vars = Variables('variables.py')
msvcver = vars.args.get('vc', '9')

# Check command args to force one Microsoft Visual Studio version
if msvcver == '9' or msvcver == '11':
  env = Environment(MSVC_VERSION=msvcver+'.0', MSVC_BATCH=False)
else:
  env = Environment()
    
AddOption('--userfile', action='store_true', dest='userfile', default=False,
          help="Create Visual Studio Project user file")

#
# 1. Configure your Debug Setting dictionary with options you want in the list
# of allowed options, for instance if you want to create a user file to launch
# a specific application for testing your dll with Microsoft Visual Studio 2008 (v9):
#
V9DebugSettings = {
    'Command':'c:\\myapp\\using\\thisdll.exe',
    'WorkingDirectory': 'c:\\myapp\\using\\',
    'CommandArguments': '-p password',
#     'Attach':'false',
#     'DebuggerType':'3',
#     'Remote':'1',
#     'RemoteMachine': None,
#     'RemoteCommand': None,
#     'HttpUrl': None,
#     'PDBPath': None,
#     'SQLDebugging': None,
#     'Environment': '',
#     'EnvironmentMerge':'true',
#     'DebuggerFlavor': None,
#     'MPIRunCommand': None,
#     'MPIRunArguments': None,
#     'MPIRunWorkingDirectory': None,
#     'ApplicationCommand': None,
#     'ApplicationArguments': None,
#     'ShimCommand': None,
#     'MPIAcceptMode': None,
#     'MPIAcceptFilter': None,
}

#
# 2. Because there are a lot of different options depending on the Microsoft 
# Visual Studio version, if you use more than one version you have to 
# define a dictionary per version, for instance if you want to create a user 
# file to launch a specific application for testing your dll with Microsoft 
# Visual Studio 2012 (v11):
#
V10DebugSettings = {
    'LocalDebuggerCommand': 'c:\\myapp\\using\\thisdll.exe',
    'LocalDebuggerWorkingDirectory': 'c:\\myapp\\using\\',
    'LocalDebuggerCommandArguments': '-p password',
#     'LocalDebuggerEnvironment': None,
#     'DebuggerFlavor': 'WindowsLocalDebugger',
#     'LocalDebuggerAttach': None,
#     'LocalDebuggerDebuggerType': None,
#     'LocalDebuggerMergeEnvironment': None,
#     'LocalDebuggerSQLDebugging': None,
#     'RemoteDebuggerCommand': None,
#     'RemoteDebuggerCommandArguments': None,
#     'RemoteDebuggerWorkingDirectory': None,
#     'RemoteDebuggerServerName': None,
#     'RemoteDebuggerConnection': None,
#     'RemoteDebuggerDebuggerType': None,
#     'RemoteDebuggerAttach': None,
#     'RemoteDebuggerSQLDebugging': None,
#     'DeploymentDirectory': None,
#     'AdditionalFiles': None,
#     'RemoteDebuggerDeployDebugCppRuntime': None,
#     'WebBrowserDebuggerHttpUrl': None,
#     'WebBrowserDebuggerDebuggerType': None,
#     'WebServiceDebuggerHttpUrl': None,
#     'WebServiceDebuggerDebuggerType': None,
#     'WebServiceDebuggerSQLDebugging': None,
}

#
# 3. Select the dictionary you want depending on the version of visual Studio 
# Files you want to generate.
#
if not env.GetOption('userfile'):
    dbgSettings = None
elif env.get('MSVC_VERSION', None) == '9.0':
    dbgSettings = V9DebugSettings
elif env.get('MSVC_VERSION', None) == '11.0':
    dbgSettings = V10DebugSettings
else:    
    dbgSettings = None

#
# 4. Add the dictionary to the DebugSettings keyword.
#
barsrcs = ['bar.cpp', 'dllmain.cpp', 'stdafx.cpp']
barincs = ['targetver.h']
barlocalincs = ['StdAfx.h']
barresources = ['bar.rc','resource.h']
barmisc = ['ReadMe.txt']

dll = env.SharedLibrary(target = 'bar.dll',
                        source = barsrcs)

env.MSVSProject(target = 'Bar' + env['MSVSPROJECTSUFFIX'],
                srcs = barsrcs,
                incs = barincs,
                localincs = barlocalincs,
                resources = barresources,
                misc = barmisc,
                buildtarget = [dll[0]] * 2,
                variant = ('Debug|Win32', 'Release|Win32'),
                cmdargs = 'vc=%s' %  msvcver,
                DebugSettings = (dbgSettings, {}))

MSVSSolution(), env.MSVSSolution()

Builds a Microsoft Visual Studio solution file.

This builds a Visual Studio solution file, based on the version of Visual Studio that is configured (either the latest installed version, or the version specified by $MSVS_VERSION in the construction environment). For Visual Studio 6, it will generate a .dsw file. For Visual Studio 7 (.NET), it will generate a .sln file.

The following values must be specified:

target

The name of the target .dsw or .sln file. The correct suffix for the version of Visual Studio must be used, but the value $MSVSSOLUTIONSUFFIX will be defined to the correct value (see example below).

variant

The name of this particular variant, or a list of variant names (the latter is only supported for MSVS 7 solutions). These are typically things like "Debug" or "Release", but really can be anything you want. For MSVS 7 they may also specify target platform, like this "Debug|Xbox". Default platform is Win32.

projects

A list of project file names, or Project nodes returned by calls to the MSVSProject Builder, to be placed into the solution file. It should be noted that these file names are NOT added to the $SOURCES environment variable in form of files, but rather as strings. This is because they represent file names to be added to the solution file, not the source files used to build the solution file.

Example Usage:

env.MSVSSolution(target = 'Bar' + env['MSVSSOLUTIONSUFFIX'], projects = ['bar'
+ env['MSVSPROJECTSUFFIX']], variant = 'Release')

Object(), env.Object()

A synonym for the StaticObject builder method.

Package(), env.Package()

Builds a Binary Package of the given source files.

env.Package(source = FindInstalledFiles())

Builds software distribution packages. Packages consist of files to install and packaging information. The former may be specified with the source parameter and may be left out, in which case the FindInstalledFiles function will collect all files that have an Install or InstallAs Builder attached. If the target is not specified it will be deduced from additional information given to this Builder.

The packaging information is specified with the help of construction variables documented below. This information is called a tag to stress that some of them can also be attached to files with the Tag function. The mandatory ones will complain if they were not specified. They vary depending on chosen target packager.

The target packager may be selected with the "PACKAGETYPE" command line option or with the $PACKAGETYPE construction variable. Currently the following packagers available:

* msi - Microsoft Installer * rpm - Redhat Package Manger * ipkg - Itsy Package Management System * tarbz2 - compressed tar * targz - compressed tar * zip - zip file * src_tarbz2 - compressed tar source * src_targz - compressed tar source * src_zip - zip file source

An updated list is always available under the "package_type" option when running "scons --help" on a project that has packaging activated.

env = Environment(tools=['default', 'packaging'])
env.Install('/bin/', 'my_program')
env.Package( NAME           = 'foo',
             VERSION        = '1.2.3',
             PACKAGEVERSION = 0,
             PACKAGETYPE    = 'rpm',
             LICENSE        = 'gpl',
             SUMMARY        = 'balalalalal',
             DESCRIPTION    = 'this should be really really long',
             X_RPM_GROUP    = 'Application/fu',
             SOURCE_URL     = 'http://foo.org/foo-1.2.3.tar.gz'
        )

PCH(), env.PCH()

Builds a Microsoft Visual C++ precompiled header. Calling this builder method returns a list of two targets: the PCH as the first element, and the object file as the second element. Normally the object file is ignored. This builder method is only provided when Microsoft Visual C++ is being used as the compiler. The PCH builder method is generally used in conjunction with the PCH construction variable to force object files to use the precompiled header:

env['PCH'] = env.PCH('StdAfx.cpp')[0]

PDF(), env.PDF()

Builds a .pdf file from a .dvi input file (or, by extension, a .tex, .ltx, or .latex input file). The suffix specified by the $PDFSUFFIX construction variable (.pdf by default) is added automatically to the target if it is not already present. Example:

# builds from aaa.tex
env.PDF(target = 'aaa.pdf', source = 'aaa.tex')
# builds bbb.pdf from bbb.dvi
env.PDF(target = 'bbb', source = 'bbb.dvi')

POInit(), env.POInit()

This builder belongs to msginit tool. The builder initializes missing PO file(s) if $POAUTOINIT is set. If $POAUTOINIT is not set (default), POInit prints instruction for user (that is supposed to be a translator), telling how the PO file should be initialized. In normal projects you should not use POInit and use POUpdate instead. POUpdate chooses intelligently between msgmerge(1) and msginit(1). POInit always uses msginit(1) and should be regarded as builder for special purposes or for temporary use (e.g. for quick, one time initialization of a bunch of PO files) or for tests.

Target nodes defined through POInit are not built by default (they're Ignored from '.' node) but are added to special Alias ('po-create' by default). The alias name may be changed through the $POCREATE_ALIAS construction variable. All PO files defined through POInit may be easily initialized by scons po-create.

Example 1. Initialize en.po and pl.po from messages.pot:

  # ...
  env.POInit(['en', 'pl']) # messages.pot --> [en.po, pl.po] 

Example 2. Initialize en.po and pl.po from foo.pot:

  # ...
  env.POInit(['en', 'pl'], ['foo']) # foo.pot --> [en.po, pl.po] 

Example 3. Initialize en.po and pl.po from foo.pot but using $POTDOMAIN construction variable:

  # ...
  env.POInit(['en', 'pl'], POTDOMAIN='foo') # foo.pot --> [en.po, pl.po] 

Example 4. Initialize PO files for languages defined in LINGUAS file. The files will be initialized from template messages.pot:

  # ...
  env.POInit(LINGUAS_FILE = 1) # needs 'LINGUAS' file

Example 5. Initialize en.po and pl.pl PO files plus files for languages defined in LINGUAS file. The files will be initialized from template messages.pot:

  # ...
  env.POInit(['en', 'pl'], LINGUAS_FILE = 1)

Example 6. You may preconfigure your environment first, and then initialize PO files:

  # ...
  env['POAUTOINIT'] = 1
  env['LINGUAS_FILE'] = 1
  env['POTDOMAIN'] = 'foo'
  env.POInit()

which has same efect as:

  # ...
  env.POInit(POAUTOINIT = 1, LINGUAS_FILE = 1, POTDOMAIN = 'foo')

PostScript(), env.PostScript()

Builds a .ps file from a .dvi input file (or, by extension, a .tex, .ltx, or .latex input file). The suffix specified by the $PSSUFFIX construction variable (.ps by default) is added automatically to the target if it is not already present. Example:

# builds from aaa.tex
env.PostScript(target = 'aaa.ps', source = 'aaa.tex')
# builds bbb.ps from bbb.dvi
env.PostScript(target = 'bbb', source = 'bbb.dvi')

POTUpdate(), env.POTUpdate()

The builder belongs to xgettext tool. The builder updates target POT file if exists or creates one if it doesn't. The node is not built by default (i.e. it is Ignored from '.'), but only on demand (i.e. when given POT file is required or when special alias is invoked). This builder adds its targe node (messages.pot, say) to a special alias (pot-update by default, see $POTUPDATE_ALIAS) so you can update/create them easily with scons pot-update. The file is not written until there is no real change in internationalized messages (or in comments that enter POT file).

Note
You may see xgettext(1) being invoked by the xgettext tool even if there is no real change in internationalized messages (so the POT file is not being updated). This happens every time a source file has changed. In such case we invoke xgettext(1) and compare its output with the content of POT file to decide whether the file should be updated or not.

Example 1. Let's create po/ directory and place following SConstruct script there:

  # SConstruct in 'po/' subdir
  env = Environment( tools = ['default', 'xgettext'] )
  env.POTUpdate(['foo'], ['../a.cpp', '../b.cpp'])
  env.POTUpdate(['bar'], ['../c.cpp', '../d.cpp'])

Then invoke scons few times:

  user@host:$ scons             # Does not create foo.pot nor bar.pot
  user@host:$ scons foo.pot     # Updates or creates foo.pot
  user@host:$ scons pot-update  # Updates or creates foo.pot and bar.pot
  user@host:$ scons -c          # Does not clean foo.pot nor bar.pot.

the results shall be as the comments above say.

Example 2. The POTUpdate builder may be used with no target specified, in which case default target messages.pot will be used. The default target may also be overridden by setting $POTDOMAIN construction variable or providing it as an override to POTUpdate builder:

    
  # SConstruct script
  env = Environment( tools = ['default', 'xgettext'] )
  env['POTDOMAIN'] = "foo"
  env.POTUpdate(source = ["a.cpp", "b.cpp"]) # Creates foo.pot ...
  env.POTUpdate(POTDOMAIN = "bar", source = ["c.cpp", "d.cpp"]) # and bar.pot

Example 3. The sources may be specified within separate file, for example POTFILES.in:

      
  # POTFILES.in in 'po/' subdirectory
  ../a.cpp
  ../b.cpp
  # end of file

The name of the file (POTFILES.in) containing the list of sources is provided via $XGETTEXTFROM:

      
  # SConstruct file in 'po/' subdirectory
  env = Environment( tools = ['default', 'xgettext'] )
  env.POTUpdate(XGETTEXTFROM = 'POTFILES.in')

Example 4. You may use $XGETTEXTPATH to define source search path. Assume, for example, that you have files a.cpp, b.cpp, po/SConstruct, po/POTFILES.in. Then your POT-related files could look as below:

  # POTFILES.in in 'po/' subdirectory
  a.cpp
  b.cpp
  # end of file

  # SConstruct file in 'po/' subdirectory
  env = Environment( tools = ['default', 'xgettext'] )
  env.POTUpdate(XGETTEXTFROM = 'POTFILES.in', XGETTEXTPATH='../')

Example 5. Multiple search directories may be defined within a list, i.e. XGETTEXTPATH = ['dir1', 'dir2', ...]. The order in the list determines the search order of source files. The path to the first file found is used.

Let's create 0/1/po/SConstruct script:

  # SConstruct file in '0/1/po/' subdirectory
  env = Environment( tools = ['default', 'xgettext'] )
  env.POTUpdate(XGETTEXTFROM = 'POTFILES.in', XGETTEXTPATH=['../', '../../'])

and 0/1/po/POTFILES.in:

  # POTFILES.in in '0/1/po/' subdirectory
  a.cpp
  # end of file

Write two *.cpp files, the first one is 0/a.cpp:

  /* 0/a.cpp */
  gettext("Hello from ../../a.cpp")

and the second is 0/1/a.cpp:

  /* 0/1/a.cpp */
  gettext("Hello from ../a.cpp")

then run scons. You'll obtain 0/1/po/messages.pot with the message "Hello from ../a.cpp". When you reverse order in $XGETTEXTFOM, i.e. when you write SConscript as

  # SConstruct file in '0/1/po/' subdirectory
  env = Environment( tools = ['default', 'xgettext'] )
  env.POTUpdate(XGETTEXTFROM = 'POTFILES.in', XGETTEXTPATH=['../../', '../'])

then the messages.pot will contain msgid "Hello from ../../a.cpp" line and not msgid "Hello from ../a.cpp".

POUpdate(), env.POUpdate()

The builder belongs to msgmerge tool. The builder updates PO files with msgmerge(1), or initializes missing PO files as described in documentation of msginit tool and POInit builder (see also $POAUTOINIT). Note, that POUpdate does not add its targets to po-create alias as POInit does.

Target nodes defined through POUpdate are not built by default (they're Ignored from '.' node). Instead, they are added automatically to special Alias ('po-update' by default). The alias name may be changed through the $POUPDATE_ALIAS construction variable. You can easily update PO files in your project by scons po-update.

Example 1. Update en.po and pl.po from messages.pot template (see also $POTDOMAIN), assuming that the later one exists or there is rule to build it (see POTUpdate):

  # ...
  env.POUpdate(['en','pl']) # messages.pot --> [en.po, pl.po]

Example 2. Update en.po and pl.po from foo.pot template:

  # ...
  env.POUpdate(['en', 'pl'], ['foo']) # foo.pot -->  [en.po, pl.pl]

Example 3. Update en.po and pl.po from foo.pot (another version):

  # ...
  env.POUpdate(['en', 'pl'], POTDOMAIN='foo') # foo.pot -- > [en.po, pl.pl]

Example 4. Update files for languages defined in LINGUAS file. The files are updated from messages.pot template:

  # ...
  env.POUpdate(LINGUAS_FILE = 1) # needs 'LINGUAS' file

Example 5. Same as above, but update from foo.pot template:

  # ...
  env.POUpdate(LINGUAS_FILE = 1, source = ['foo'])

Example 6. Update en.po and pl.po plus files for languages defined in LINGUAS file. The files are updated from messages.pot template:

  # produce 'en.po', 'pl.po' + files defined in 'LINGUAS':
  env.POUpdate(['en', 'pl' ], LINGUAS_FILE = 1) 

Example 7. Use $POAUTOINIT to automatically initialize PO file if it doesn't exist:

  # ...
  env.POUpdate(LINGUAS_FILE = 1, POAUTOINIT = 1)

Example 8. Update PO files for languages defined in LINGUAS file. The files are updated from foo.pot template. All necessary settings are pre-configured via environment.

  # ...
  env['POAUTOINIT'] = 1
  env['LINGUAS_FILE'] = 1
  env['POTDOMAIN'] = 'foo'
  env.POUpdate()

Program(), env.Program()

Builds an executable given one or more object files or C, C++, D, or Fortran source files. If any C, C++, D or Fortran source files are specified, then they will be automatically compiled to object files using the Object builder method; see that builder method's description for a list of legal source file suffixes and how they are interpreted. The target executable file prefix (specified by the $PROGPREFIX construction variable; nothing by default) and suffix (specified by the $PROGSUFFIX construction variable; by default, .exe on Windows systems, nothing on POSIX systems) are automatically added to the target if not already present. Example:

env.Program(target = 'foo', source = ['foo.o', 'bar.c', 'baz.f'])

RES(), env.RES()

Builds a Microsoft Visual C++ resource file. This builder method is only provided when Microsoft Visual C++ or MinGW is being used as the compiler. The .res (or .o for MinGW) suffix is added to the target name if no other suffix is given. The source file is scanned for implicit dependencies as though it were a C file. Example:

env.RES('resource.rc')

RMIC(), env.RMIC()

Builds stub and skeleton class files for remote objects from Java .class files. The target is a directory relative to which the stub and skeleton class files will be written. The source can be the names of .class files, or the objects return from the Java builder method.

If the construction variable $JAVACLASSDIR is set, either in the environment or in the call to the RMIC builder method itself, then the value of the variable will be stripped from the beginning of any .class file names.

classes = env.Java(target = 'classdir', source = 'src')
env.RMIC(target = 'outdir1', source = classes)

env.RMIC(target = 'outdir2',
         source = ['package/foo.class', 'package/bar.class'])

env.RMIC(target = 'outdir3',
         source = ['classes/foo.class', 'classes/bar.class'],
         JAVACLASSDIR = 'classes')

RPCGenClient(), env.RPCGenClient()

Generates an RPC client stub (_clnt.c) file from a specified RPC (.x) source file. Because rpcgen only builds output files in the local directory, the command will be executed in the source file's directory by default.

# Builds src/rpcif_clnt.c
env.RPCGenClient('src/rpcif.x')

RPCGenHeader(), env.RPCGenHeader()

Generates an RPC header (.h) file from a specified RPC (.x) source file. Because rpcgen only builds output files in the local directory, the command will be executed in the source file's directory by default.

# Builds src/rpcif.h
env.RPCGenHeader('src/rpcif.x')

RPCGenService(), env.RPCGenService()

Generates an RPC server-skeleton (_svc.c) file from a specified RPC (.x) source file. Because rpcgen only builds output files in the local directory, the command will be executed in the source file's directory by default.

# Builds src/rpcif_svc.c
env.RPCGenClient('src/rpcif.x')

RPCGenXDR(), env.RPCGenXDR()

Generates an RPC XDR routine (_xdr.c) file from a specified RPC (.x) source file. Because rpcgen only builds output files in the local directory, the command will be executed in the source file's directory by default.

# Builds src/rpcif_xdr.c
env.RPCGenClient('src/rpcif.x')

SharedLibrary(), env.SharedLibrary()

Builds a shared library (.so on a POSIX system, .dll on Windows) given one or more object files or C, C++, D or Fortran source files. If any source files are given, then they will be automatically compiled to object files. The static library prefix and suffix (if any) are automatically added to the target. The target library file prefix (specified by the $SHLIBPREFIX construction variable; by default, lib on POSIX systems, nothing on Windows systems) and suffix (specified by the $SHLIBSUFFIX construction variable; by default, .dll on Windows systems, .so on POSIX systems) are automatically added to the target if not already present. Example:

env.SharedLibrary(target = 'bar', source = ['bar.c', 'foo.o'])

On Windows systems, the SharedLibrary builder method will always build an import (.lib) library in addition to the shared (.dll) library, adding a .lib library with the same basename if there is not already a .lib file explicitly listed in the targets.

On Cygwin systems, the SharedLibrary builder method will always build an import (.dll.a) library in addition to the shared (.dll) library, adding a .dll.a library with the same basename if there is not already a .dll.a file explicitly listed in the targets.

Any object files listed in the source must have been built for a shared library (that is, using the SharedObject builder method). scons will raise an error if there is any mismatch.

On some platforms, there is a distinction between a shared library (loaded automatically by the system to resolve external references) and a loadable module (explicitly loaded by user action). For maximum portability, use the LoadableModule builder for the latter.

When the $SHLIBVERSION construction variable is defined a versioned shared library is created. This modifies the $SHLINKFLAGS as required, adds the version number to the library name, and creates the symlinks that are needed.

env.SharedLibrary(target = 'bar', source = ['bar.c', 'foo.o'], SHLIBVERSION='1.5.2')

On a POSIX system, versions with a single token create exactly one symlink: libbar.so.6 would have symlinks libbar.so only. On a POSIX system, versions with two or more tokens create exactly two symlinks: libbar.so.2.3.1 would have symlinks libbar.so and libbar.so.2; on a Darwin (OSX) system the library would be libbar.2.3.1.dylib and the link would be libbar.dylib.

On Windows systems, specifying register=1 will cause the .dll to be registered after it is built using REGSVR32. The command that is run ("regsvr32" by default) is determined by $REGSVR construction variable, and the flags passed are determined by $REGSVRFLAGS. By default, $REGSVRFLAGS includes the /s option, to prevent dialogs from popping up and requiring user attention when it is run. If you change $REGSVRFLAGS, be sure to include the /s option. For example,

env.SharedLibrary(target = 'bar',
                  source = ['bar.cxx', 'foo.obj'],
                  register=1)

will register bar.dll as a COM object when it is done linking it.

SharedObject(), env.SharedObject()

Builds an object file for inclusion in a shared library. Source files must have one of the same set of extensions specified above for the StaticObject builder method. On some platforms building a shared object requires additional compiler option (e.g. -fPIC for gcc) in addition to those needed to build a normal (static) object, but on some platforms there is no difference between a shared object and a normal (static) one. When there is a difference, SCons will only allow shared objects to be linked into a shared library, and will use a different suffix for shared objects. On platforms where there is no difference, SCons will allow both normal (static) and shared objects to be linked into a shared library, and will use the same suffix for shared and normal (static) objects. The target object file prefix (specified by the $SHOBJPREFIX construction variable; by default, the same as $OBJPREFIX) and suffix (specified by the $SHOBJSUFFIX construction variable) are automatically added to the target if not already present. Examples:

env.SharedObject(target = 'ddd', source = 'ddd.c')
env.SharedObject(target = 'eee.o', source = 'eee.cpp')
env.SharedObject(target = 'fff.obj', source = 'fff.for')

Note that the source files will be scanned according to the suffix mappings in the SourceFileScanner object. See the section "Scanner Objects," below, for more information.

StaticLibrary(), env.StaticLibrary()

Builds a static library given one or more object files or C, C++, D or Fortran source files. If any source files are given, then they will be automatically compiled to object files. The static library prefix and suffix (if any) are automatically added to the target. The target library file prefix (specified by the $LIBPREFIX construction variable; by default, lib on POSIX systems, nothing on Windows systems) and suffix (specified by the $LIBSUFFIX construction variable; by default, .lib on Windows systems, .a on POSIX systems) are automatically added to the target if not already present. Example:

env.StaticLibrary(target = 'bar', source = ['bar.c', 'foo.o'])

Any object files listed in the source must have been built for a static library (that is, using the StaticObject builder method). scons will raise an error if there is any mismatch.

StaticObject(), env.StaticObject()

Builds a static object file from one or more C, C++, D, or Fortran source files. Source files must have one of the following extensions:

  .asm    assembly language file
  .ASM    assembly language file
  .c      C file
  .C      Windows:  C file
          POSIX:  C++ file
  .cc     C++ file
  .cpp    C++ file
  .cxx    C++ file
  .cxx    C++ file
  .c++    C++ file
  .C++    C++ file
  .d      D file
  .f      Fortran file
  .F      Windows:  Fortran file
          POSIX:  Fortran file + C pre-processor
  .for    Fortran file
  .FOR    Fortran file
  .fpp    Fortran file + C pre-processor
  .FPP    Fortran file + C pre-processor
  .m      Object C file
  .mm     Object C++ file
  .s      assembly language file
  .S      Windows:  assembly language file
          ARM: CodeSourcery Sourcery Lite
  .sx     assembly language file + C pre-processor
          POSIX:  assembly language file + C pre-processor
  .spp    assembly language file + C pre-processor
  .SPP    assembly language file + C pre-processor

The target object file prefix (specified by the $OBJPREFIX construction variable; nothing by default) and suffix (specified by the $OBJSUFFIX construction variable; .obj on Windows systems, .o on POSIX systems) are automatically added to the target if not already present. Examples:

env.StaticObject(target = 'aaa', source = 'aaa.c')
env.StaticObject(target = 'bbb.o', source = 'bbb.c++')
env.StaticObject(target = 'ccc.obj', source = 'ccc.f')

Note that the source files will be scanned according to the suffix mappings in SourceFileScanner object. See the section "Scanner Objects," below, for more information.

Substfile(), env.Substfile()

The Substfile builder creates a single text file from another file or set of files by concatenating them with $LINESEPARATOR and replacing text using the $SUBST_DICT construction variable. Nested lists of source files are flattened. See also Textfile.

If a single source file is present with an .in suffix, the suffix is stripped and the remainder is used as the default target name.

The prefix and suffix specified by the $SUBSTFILEPREFIX and $SUBSTFILESUFFIX construction variables (the null string by default in both cases) are automatically added to the target if they are not already present.

If a construction variable named $SUBST_DICT is present, it may be either a Python dictionary or a sequence of (key,value) tuples. If it is a dictionary it is converted into a list of tuples in an arbitrary order, so if one key is a prefix of another key or if one substitution could be further expanded by another subsitition, it is unpredictable whether the expansion will occur.

Any occurrences of a key in the source are replaced by the corresponding value, which may be a Python callable function or a string. If the value is a callable, it is called with no arguments to get a string. Strings are subst-expanded and the result replaces the key.

env = Environment(tools = ['default', 'textfile'])

env['prefix'] = '/usr/bin'
script_dict = {'@prefix@': '/bin', @exec_prefix@: '$prefix'}
env.Substfile('script.in', SUBST_DICT = script_dict)

conf_dict = {'%VERSION%': '1.2.3', '%BASE%': 'MyProg'}
env.Substfile('config.h.in', conf_dict, SUBST_DICT = conf_dict)

# UNPREDICTABLE - one key is a prefix of another
bad_foo = {'$foo': '$foo', '$foobar': '$foobar'}
env.Substfile('foo.in', SUBST_DICT = bad_foo)

# PREDICTABLE - keys are applied longest first
good_foo = [('$foobar', '$foobar'), ('$foo', '$foo')]
env.Substfile('foo.in', SUBST_DICT = good_foo)

# UNPREDICTABLE - one substitution could be futher expanded
bad_bar = {'@bar@': '@soap@', '@soap@': 'lye'}
env.Substfile('bar.in', SUBST_DICT = bad_bar)

# PREDICTABLE - substitutions are expanded in order
good_bar = (('@bar@', '@soap@'), ('@soap@', 'lye'))
env.Substfile('bar.in', SUBST_DICT = good_bar)

# the SUBST_DICT may be in common (and not an override)
substutions = {}
subst = Environment(tools = ['textfile'], SUBST_DICT = substitutions)
substitutions['@foo@'] = 'foo'
subst['SUBST_DICT']['@bar@'] = 'bar'
subst.Substfile('pgm1.c', [Value('#include "@foo@.h"'),
                           Value('#include "@bar@.h"'),
                           "common.in",
                           "pgm1.in"
                          ])
subst.Substfile('pgm2.c', [Value('#include "@foo@.h"'),
                           Value('#include "@bar@.h"'),
                           "common.in",
                           "pgm2.in"
                          ])

Tar(), env.Tar()

Builds a tar archive of the specified files and/or directories. Unlike most builder methods, the Tar builder method may be called multiple times for a given target; each additional call adds to the list of entries that will be built into the archive. Any source directories will be scanned for changes to any on-disk files, regardless of whether or not scons knows about them from other Builder or function calls.

env.Tar('src.tar', 'src')

# Create the stuff.tar file.
env.Tar('stuff', ['subdir1', 'subdir2'])
# Also add "another" to the stuff.tar file.
env.Tar('stuff', 'another')

# Set TARFLAGS to create a gzip-filtered archive.
env = Environment(TARFLAGS = '-c -z')
env.Tar('foo.tar.gz', 'foo')

# Also set the suffix to .tgz.
env = Environment(TARFLAGS = '-c -z',
                  TARSUFFIX = '.tgz')
env.Tar('foo')

Textfile(), env.Textfile()

The Textfile builder generates a single text file. The source strings constitute the lines; nested lists of sources are flattened. $LINESEPARATOR is used to separate the strings.

If present, the $SUBST_DICT construction variable is used to modify the strings before they are written; see the Substfile description for details.

The prefix and suffix specified by the $TEXTFILEPREFIX and $TEXTFILESUFFIX construction variables (the null string and .txt by default, respectively) are automatically added to the target if they are not already present. Examples:

# builds/writes foo.txt
env.Textfile(target = 'foo.txt', source = ['Goethe', 42, 'Schiller'])

# builds/writes bar.txt
env.Textfile(target = 'bar',
             source = ['lalala', 'tanteratei'],
             LINESEPARATOR='|*')

# nested lists are flattened automatically
env.Textfile(target = 'blob',
             source = ['lalala', ['Goethe', 42 'Schiller'], 'tanteratei'])

# files may be used as input by wraping them in File()
env.Textfile(target = 'concat',  # concatenate files with a marker between
             source = [File('concat1'), File('concat2')],
             LINESEPARATOR = '====================\n')

Results are:
foo.txt
  ....8<----
  Goethe
  42
  Schiller
  ....8<---- (no linefeed at the end)

bar.txt:
  ....8<----
  lalala|*tanteratei
  ....8<---- (no linefeed at the end)

blob.txt
  ....8<----
  lalala
  Goethe
  42
  Schiller
  tanteratei
  ....8<---- (no linefeed at the end)

Translate(), env.Translate()

This pseudo-builder belongs to gettext toolset. The builder extracts internationalized messages from source files, updates POT template (if necessary) and then updates PO translations (if necessary). If $POAUTOINIT is set, missing PO files will be automatically created (i.e. without translator person intervention). The variables $LINGUAS_FILE and $POTDOMAIN are taken into acount too. All other construction variables used by POTUpdate, and POUpdate work here too.

Example 1. The simplest way is to specify input files and output languages inline in a SCons script when invoking Translate

# SConscript in 'po/' directory
env = Environment( tools = ["default", "gettext"] )
env['POAUTOINIT'] = 1
env.Translate(['en','pl'], ['../a.cpp','../b.cpp']) 

Example 2. If you wish, you may also stick to conventional style known from autotools, i.e. using POTFILES.in and LINGUAS files

# LINGUAS
en pl 
#end

# POTFILES.in
a.cpp
b.cpp
# end

# SConscript
env = Environment( tools = ["default", "gettext"] )
env['POAUTOINIT'] = 1
env['XGETTEXTPATH'] = ['../']
env.Translate(LINGUAS_FILE = 1, XGETTEXTFROM = 'POTFILES.in') 

The last approach is perhaps the recommended one. It allows easily split internationalization/localization onto separate SCons scripts, where a script in source tree is responsible for translations (from sources to PO files) and script(s) under variant directories are responsible for compilation of PO to MO files to and for installation of MO files. The "gluing factor" synchronizing these two scripts is then the content of LINGUAS file. Note, that the updated POT and PO files are usually going to be committed back to the repository, so they must be updated within the source directory (and not in variant directories). Additionaly, the file listing of po/ directory contains LINGUAS file, so the source tree looks familiar to translators, and they may work with the project in their usual way.

Example 3. Let's prepare a development tree as below

 project/
  + SConstruct
  + build/        
  + src/
      + po/
          + SConscript
          + SConscript.i18n
          + POTFILES.in
          + LINGUAS

with build being variant directory. Write the top-level SConstruct script as follows

  # SConstruct
  env = Environment( tools = ["default", "gettext"] )
  VariantDir('build', 'src', duplicate = 0)
  env['POAUTOINIT'] = 1
  SConscript('src/po/SConscript.i18n', exports = 'env')
  SConscript('build/po/SConscript', exports = 'env')

the src/po/SConscript.i18n as

  # src/po/SConscript.i18n
  Import('env')
  env.Translate(LINGUAS_FILE=1, XGETTEXTFROM='POTFILES.in', XGETTEXTPATH=['../'])

and the src/po/SConscript

  # src/po/SConscript
  Import('env')
  env.MOFiles(LINGUAS_FILE = 1)

Such setup produces POT and PO files under source tree in src/po/ and binary MO files under variant tree in build/po/. This way the POT and PO files are separated from other output files, which must not be committed back to source repositories (e.g. MO files).

Note
In above example, the PO files are not updated, nor created automatically when you issue scons '.' command. The files must be updated (created) by hand via scons po-update and then MO files can be compiled by running scons '.'.

TypeLibrary(), env.TypeLibrary()

Builds a Windows type library (.tlb) file from an input IDL file (.idl). In addition, it will build the associated interface stub and proxy source files, naming them according to the base name of the .idl file. For example,

env.TypeLibrary(source="foo.idl")

Will create foo.tlb, foo.h, foo_i.c, foo_p.c and foo_data.c files.

Uic(), env.Uic()

Builds a header file, an implementation file and a moc file from an ui file. and returns the corresponding nodes in the above order. This builder is only available after using the tool 'qt'. Note: you can specify .ui files directly as source files to the Program, Library and SharedLibrary builders without using this builder. Using this builder lets you override the standard naming conventions (be careful: prefixes are always prepended to names of built files; if you don't want prefixes, you may set them to ``). See the $QTDIR variable for more information. Example:

env.Uic('foo.ui') # -> ['foo.h', 'uic_foo.cc', 'moc_foo.cc']
env.Uic(target = Split('include/foo.h gen/uicfoo.cc gen/mocfoo.cc'),
        source = 'foo.ui') # -> ['include/foo.h', 'gen/uicfoo.cc', 'gen/mocfoo.cc']

Zip(), env.Zip()

Builds a zip archive of the specified files and/or directories. Unlike most builder methods, the Zip builder method may be called multiple times for a given target; each additional call adds to the list of entries that will be built into the archive. Any source directories will be scanned for changes to any on-disk files, regardless of whether or not scons knows about them from other Builder or function calls.

env.Zip('src.zip', 'src')

# Create the stuff.zip file.
env.Zip('stuff', ['subdir1', 'subdir2'])
# Also add "another" to the stuff.tar file.
env.Zip('stuff', 'another')

All targets of builder methods automatically depend on their sources. An explicit dependency can be specified using the Depends method of a construction environment (see below).

In addition, scons automatically scans source files for various programming languages, so the dependencies do not need to be specified explicitly. By default, SCons can C source files, C++ source files, Fortran source files with .F (POSIX systems only), .fpp, or .FPP file extensions, and assembly language files with .S (POSIX systems only), .spp, or .SPP files extensions for C preprocessor dependencies. SCons also has default support for scanning D source files, You can also write your own Scanners to add support for additional source file types. These can be added to the default Scanner object used by the Object(), StaticObject(), and SharedObject() Builders by adding them to the SourceFileScanner object. See the section "Scanner Objects" below, for more information about defining your own Scanner objects and using the SourceFileScanner object.  

Methods and Functions to Do Things

In addition to Builder methods, scons provides a number of other construction environment methods and global functions to manipulate the build configuration.

Usually, a construction environment method and global function with the same name both exist so that you don't have to remember whether to a specific bit of functionality must be called with or without a construction environment. In the following list, if you call something as a global function it looks like:

Function(arguments)

and if you call something through a construction environment it looks like:

env.Function(arguments)

If you can call the functionality in both ways, then both forms are listed.

Global functions may be called from custom Python modules that you import into an SConscript file by adding the following to the Python module:

from SCons.Script import *

Except where otherwise noted, the same-named construction environment method and global function provide the exact same functionality. The only difference is that, where appropriate, calling the functionality through a construction environment will substitute construction variables into any supplied strings. For example:

env = Environment(FOO = 'foo')
Default('$FOO')
env.Default('$FOO')

In the above example, the first call to the global Default() function will actually add a target named $FOO to the list of default targets, while the second call to the env.Default() construction environment method will expand the value and add a target named foo to the list of default targets. For more on construction variable expansion, see the next section on construction variables.

Construction environment methods and global functions supported by scons include:

Action(action, [cmd/str/fun, [var, ...]] [option=value, ...]), env.Action(action, [cmd/str/fun, [var, ...]] [option=value, ...])

Creates an Action object for the specified action. See the section "Action Objects," below, for a complete explanation of the arguments and behavior.

Note that the env.Action() form of the invocation will expand construction variables in any argument strings, including the action argument, at the time it is called using the construction variables in the env construction environment through which env.Action() was called. The Action() form delays all variable expansion until the Action object is actually used.

AddMethod(object, function, [name]), env.AddMethod(function, [name])

When called with the AddMethod() form, adds the specified function to the specified object as the specified method name. When called with the env.AddMethod() form, adds the specified function to the construction environment env as the specified method name. In both cases, if name is omitted or None, the name of the specified function itself is used for the method name.

Examples:

# Note that the first argument to the function to
# be attached as a method must be the object through
# which the method will be called; the Python
# convention is to call it 'self'.
def my_method(self, arg):
    print "my_method() got", arg

# Use the global AddMethod() function to add a method
# to the Environment class.  This
AddMethod(Environment, my_method)
env = Environment()
env.my_method('arg')

# Add the function as a method, using the function
# name for the method call.
env = Environment()
env.AddMethod(my_method, 'other_method_name')
env.other_method_name('another arg')

AddOption(arguments)

This function adds a new command-line option to be recognized. The specified arguments are the same as supported by the standard Python optparse.add_option() method (with a few additional capabilities noted below); see the documentation for optparse for a thorough discussion of its option-processing capabities.

In addition to the arguments and values supported by the optparse.add_option() method, the SCons AddOption function allows you to set the nargs keyword value to '?' (a string with just the question mark) to indicate that the specified long option(s) take(s) an optional argument. When nargs = '?' is passed to the AddOption function, the const keyword argument may be used to supply the "default" value that should be used when the option is specified on the command line without an explicit argument.

If no default= keyword argument is supplied when calling AddOption, the option will have a default value of None.

Once a new command-line option has been added with AddOption, the option value may be accessed using GetOption or env.GetOption(). The value may also be set, using SetOption or env.SetOption(), if conditions in a SConscript require overriding any default value. Note, however, that a value specified on the command line will always override a value set by any SConscript file.

Any specified help= strings for the new option(s) will be displayed by the -H or -h options (the latter only if no other help text is specified in the SConscript files). The help text for the local options specified by AddOption will appear below the SCons options themselves, under a separate Local Options heading. The options will appear in the help text in the order in which the AddOption calls occur.

Example:

AddOption('--prefix',
          dest='prefix',
          nargs=1, type='string',
          action='store',
          metavar='DIR',
          help='installation prefix')
env = Environment(PREFIX = GetOption('prefix'))

AddPostAction(target, action), env.AddPostAction(target, action)

Arranges for the specified action to be performed after the specified target has been built. The specified action(s) may be an Action object, or anything that can be converted into an Action object (see below).

When multiple targets are supplied, the action may be called multiple times, once after each action that generates one or more targets in the list.

AddPreAction(target, action), env.AddPreAction(target, action)

Arranges for the specified action to be performed before the specified target is built. The specified action(s) may be an Action object, or anything that can be converted into an Action object (see below).

When multiple targets are specified, the action(s) may be called multiple times, once before each action that generates one or more targets in the list.

Note that if any of the targets are built in multiple steps, the action will be invoked just before the "final" action that specifically generates the specified target(s). For example, when building an executable program from a specified source .c file via an intermediate object file:

foo = Program('foo.c')
AddPreAction(foo, 'pre_action')

The specified pre_action would be executed before scons calls the link command that actually generates the executable program binary foo, not before compiling the foo.c file into an object file.

Alias(alias, [targets, [action]]), env.Alias(alias, [targets, [action]])

Creates one or more phony targets that expand to one or more other targets. An optional action (command) or list of actions can be specified that will be executed whenever the any of the alias targets are out-of-date. Returns the Node object representing the alias, which exists outside of any file system. This Node object, or the alias name, may be used as a dependency of any other target, including another alias. Alias can be called multiple times for the same alias to add additional targets to the alias, or additional actions to the list for this alias.

Examples:

Alias('install')
Alias('install', '/usr/bin')
Alias(['install', 'install-lib'], '/usr/local/lib')

env.Alias('install', ['/usr/local/bin', '/usr/local/lib'])
env.Alias('install', ['/usr/local/man'])

env.Alias('update', ['file1', 'file2'], "update_database $SOURCES")

AllowSubstExceptions([exception, ...])

Specifies the exceptions that will be allowed when expanding construction variables. By default, any construction variable expansions that generate a NameError or IndexError exception will expand to a '' (a null string) and not cause scons to fail. All exceptions not in the specified list will generate an error message and terminate processing.

If AllowSubstExceptions is called multiple times, each call completely overwrites the previous list of allowed exceptions.

Example:

# Requires that all construction variable names exist.
# (You may wish to do this if you want to enforce strictly
# that all construction variables must be defined before use.)
AllowSubstExceptions()

# Also allow a string containing a zero-division expansion
# like '${1 / 0}' to evalute to ''.
AllowSubstExceptions(IndexError, NameError, ZeroDivisionError)

AlwaysBuild(target, ...), env.AlwaysBuild(target, ...)

Marks each given target so that it is always assumed to be out of date, and will always be rebuilt if needed. Note, however, that AlwaysBuild does not add its target(s) to the default target list, so the targets will only be built if they are specified on the command line, or are a dependent of a target specified on the command line--but they will always be built if so specified. Multiple targets can be passed in to a single call to AlwaysBuild.

env.Append(key=val, [...])

Appends the specified keyword arguments to the end of construction variables in the environment. If the Environment does not have the specified construction variable, it is simply added to the environment. If the values of the construction variable and the keyword argument are the same type, then the two values will be simply added together. Otherwise, the construction variable and the value of the keyword argument are both coerced to lists, and the lists are added together. (See also the Prepend method, below.)

Example:

env.Append(CCFLAGS = ' -g', FOO = ['foo.yyy'])

env.AppendENVPath(name, newpath, [envname, sep, delete_existing])

This appends new path elements to the given path in the specified external environment (ENV by default). This will only add any particular path once (leaving the last one it encounters and ignoring the rest, to preserve path order), and to help assure this, will normalize all paths (using os.path.normpath and os.path.normcase). This can also handle the case where the given old path variable is a list instead of a string, in which case a list will be returned instead of a string.

If delete_existing is 0, then adding a path that already exists will not move it to the end; it will stay where it is in the list.

Example:

print 'before:',env['ENV']['INCLUDE']
include_path = '/foo/bar:/foo'
env.AppendENVPath('INCLUDE', include_path)
print 'after:',env['ENV']['INCLUDE']

yields:
before: /foo:/biz
after: /biz:/foo/bar:/foo

env.AppendUnique(key=val, [...], delete_existing=0)

Appends the specified keyword arguments to the end of construction variables in the environment. If the Environment does not have the specified construction variable, it is simply added to the environment. If the construction variable being appended to is a list, then any value(s) that already exist in the construction variable will not be added again to the list. However, if delete_existing is 1, existing matching values are removed first, so existing values in the arg list move to the end of the list.

Example:

env.AppendUnique(CCFLAGS = '-g', FOO = ['foo.yyy'])

env.BitKeeper()

A factory function that returns a Builder object to be used to fetch source files using BitKeeper. The returned Builder is intended to be passed to the SourceCode function.

This function is deprecated. For details, see the entry for the SourceCode function.

Example:

env.SourceCode('.', env.BitKeeper())

BuildDir(build_dir, src_dir, [duplicate]), env.BuildDir(build_dir, src_dir, [duplicate])

Deprecated synonyms for VariantDir and env.VariantDir(). The build_dir argument becomes the variant_dir argument of VariantDir or env.VariantDir().

Builder(action, [arguments]), env.Builder(action, [arguments])

Creates a Builder object for the specified action. See the section "Builder Objects," below, for a complete explanation of the arguments and behavior.

Note that the env.Builder() form of the invocation will expand construction variables in any arguments strings, including the action argument, at the time it is called using the construction variables in the env construction environment through which env.Builder() was called. The Builder form delays all variable expansion until after the Builder object is actually called.

CacheDir(cache_dir), env.CacheDir(cache_dir)

Specifies that scons will maintain a cache of derived files in cache_dir. The derived files in the cache will be shared among all the builds using the same CacheDir call. Specifying a cache_dir of None disables derived file caching.

Calling env.CacheDir() will only affect targets built through the specified construction environment. Calling CacheDir sets a global default that will be used by all targets built through construction environments that do not have an env.CacheDir() specified.

When a CacheDir() is being used and scons finds a derived file that needs to be rebuilt, it will first look in the cache to see if a derived file has already been built from identical input files and an identical build action (as incorporated into the MD5 build signature). If so, scons will retrieve the file from the cache. If the derived file is not present in the cache, scons will rebuild it and then place a copy of the built file in the cache (identified by its MD5 build signature), so that it may be retrieved by other builds that need to build the same derived file from identical inputs.

Use of a specified CacheDir may be disabled for any invocation by using the --cache-disable option.

If the --cache-force option is used, scons will place a copy of all derived files in the cache, even if they already existed and were not built by this invocation. This is useful to populate a cache the first time CacheDir is added to a build, or after using the --cache-disable option.

When using CacheDir, scons will report, "Retrieved `file' from cache," unless the --cache-show option is being used. When the --cache-show option is used, scons will print the action that would have been used to build the file, without any indication that the file was actually retrieved from the cache. This is useful to generate build logs that are equivalent regardless of whether a given derived file has been built in-place or retrieved from the cache.

The NoCache method can be used to disable caching of specific files. This can be useful if inputs and/or outputs of some tool are impossible to predict or prohibitively large.

Clean(targets, files_or_dirs), env.Clean(targets, files_or_dirs)

This specifies a list of files or directories which should be removed whenever the targets are specified with the -c command line option. The specified targets may be a list or an individual target. Multiple calls to Clean are legal, and create new targets or add files and directories to the clean list for the specified targets.

Multiple files or directories should be specified either as separate arguments to the Clean method, or as a list. Clean will also accept the return value of any of the construction environment Builder methods. Examples:

The related NoClean function overrides calling Clean for the same target, and any targets passed to both functions will not be removed by the -c option.

Examples:

Clean('foo', ['bar', 'baz'])
Clean('dist', env.Program('hello', 'hello.c'))
Clean(['foo', 'bar'], 'something_else_to_clean')

In this example, installing the project creates a subdirectory for the documentation. This statement causes the subdirectory to be removed if the project is deinstalled.

Clean(docdir, os.path.join(docdir, projectname))

env.Clone([key=val, ...])

Returns a separate copy of a construction environment. If there are any keyword arguments specified, they are added to the returned copy, overwriting any existing values for the keywords.

Example:

env2 = env.Clone()
env3 = env.Clone(CCFLAGS = '-g')

Additionally, a list of tools and a toolpath may be specified, as in the Environment constructor:

def MyTool(env): env['FOO'] = 'bar'
env4 = env.Clone(tools = ['msvc', MyTool])

The parse_flags keyword argument is also recognized:

# create an environment for compiling programs that use wxWidgets
wx_env = env.Clone(parse_flags = '!wx-config --cflags --cxxflags')

Command(target, source, action, [key=val, ...]), env.Command(target, source, action, [key=val, ...])

Executes a specific action (or list of actions) to build a target file or files. This is more convenient than defining a separate Builder object for a single special-case build.

As a special case, the source_scanner keyword argument can be used to specify a Scanner object that will be used to scan the sources. (The global DirScanner object can be used if any of the sources will be directories that must be scanned on-disk for changes to files that aren't already specified in other Builder of function calls.)

Any other keyword arguments specified override any same-named existing construction variables.

An action can be an external command, specified as a string, or a callable Python object; see "Action Objects," below, for more complete information. Also note that a string specifying an external command may be preceded by an @ (at-sign) to suppress printing the command in question, or by a - (hyphen) to ignore the exit status of the external command.

Examples:

env.Command('foo.out', 'foo.in',
            "$FOO_BUILD < $SOURCES > $TARGET")

env.Command('bar.out', 'bar.in',
            ["rm -f $TARGET",
             "$BAR_BUILD < $SOURCES > $TARGET"],
            ENV = {'PATH' : '/usr/local/bin/'})

def rename(env, target, source):
    import os
    os.rename('.tmp', str(target[0]))

env.Command('baz.out', 'baz.in',
            ["$BAZ_BUILD < $SOURCES > .tmp",
             rename ])

Note that the Command function will usually assume, by default, that the specified targets and/or sources are Files, if no other part of the configuration identifies what type of entry it is. If necessary, you can explicitly specify that targets or source nodes should be treated as directoriese by using the Dir or env.Dir() functions.

Examples:

env.Command('ddd.list', Dir('ddd'), 'ls -l $SOURCE > $TARGET')

env['DISTDIR'] = 'destination/directory'
env.Command(env.Dir('$DISTDIR')), None, make_distdir)

(Also note that SCons will usually automatically create any directory necessary to hold a target file, so you normally don't need to create directories by hand.)

Configure(env, [custom_tests, conf_dir, log_file, config_h]), env.Configure([custom_tests, conf_dir, log_file, config_h])

Creates a Configure object for integrated functionality similar to GNU autoconf. See the section "Configure Contexts," below, for a complete explanation of the arguments and behavior.

env.Copy([key=val, ...])

A now-deprecated synonym for env.Clone().

env.CVS(repository, module)

A factory function that returns a Builder object to be used to fetch source files from the specified CVS repository. The returned Builder is intended to be passed to the SourceCode function.

This function is deprecated. For details, see the entry for the SourceCode function.

The optional specified module will be added to the beginning of all repository path names; this can be used, in essence, to strip initial directory names from the repository path names, so that you only have to replicate part of the repository directory hierarchy in your local build directory.

Examples:

# Will fetch foo/bar/src.c
# from /usr/local/CVSROOT/foo/bar/src.c.
env.SourceCode('.', env.CVS('/usr/local/CVSROOT'))

# Will fetch bar/src.c
# from /usr/local/CVSROOT/foo/bar/src.c.
env.SourceCode('.', env.CVS('/usr/local/CVSROOT', 'foo'))

# Will fetch src.c
# from /usr/local/CVSROOT/foo/bar/src.c.
env.SourceCode('.', env.CVS('/usr/local/CVSROOT', 'foo/bar'))

Decider(function), env.Decider(function)

Specifies that all up-to-date decisions for targets built through this construction environment will be handled by the specified function. The function can be one of the following strings that specify the type of decision function to be performed:

timestamp-newer

Specifies that a target shall be considered out of date and rebuilt if the dependency's timestamp is newer than the target file's timestamp. This is the behavior of the classic Make utility, and make can be used a synonym for timestamp-newer.

timestamp-match

Specifies that a target shall be considered out of date and rebuilt if the dependency's timestamp is different than the timestamp recorded the last time the target was built. This provides behavior very similar to the classic Make utility (in particular, files are not opened up so that their contents can be checksummed) except that the target will also be rebuilt if a dependency file has been restored to a version with an earlier timestamp, such as can happen when restoring files from backup archives.

MD5

Specifies that a target shall be considered out of date and rebuilt if the dependency's content has changed sine the last time the target was built, as determined be performing an MD5 checksum on the dependency's contents and comparing it to the checksum recorded the last time the target was built. content can be used as a synonym for MD5.

MD5-timestamp

Specifies that a target shall be considered out of date and rebuilt if the dependency's content has changed sine the last time the target was built, except that dependencies with a timestamp that matches the last time the target was rebuilt will be assumed to be up-to-date and not rebuilt. This provides behavior very similar to the MD5 behavior of always checksumming file contents, with an optimization of not checking the contents of files whose timestamps haven't changed. The drawback is that SCons will not detect if a file's content has changed but its timestamp is the same, as might happen in an automated script that runs a build, updates a file, and runs the build again, all within a single second.

Examples:

# Use exact timestamp matches by default.
Decider('timestamp-match')

# Use MD5 content signatures for any targets built
# with the attached construction environment.
env.Decider('content')

In addition to the above already-available functions, the function argument may be an actual Python function that takes the following three arguments:

dependency

The Node (file) which should cause the target to be rebuilt if it has "changed" since the last tme target was built.

target

The Node (file) being built. In the normal case, this is what should get rebuilt if the dependency has "changed."

prev_ni

Stored information about the state of the dependency the last time the target was built. This can be consulted to match various file characteristics such as the timestamp, size, or content signature.

The function should return a True (non-zero) value if the dependency has "changed" since the last time the target was built (indicating that the target should be rebuilt), and False (zero) otherwise (indicating that the target should not be rebuilt). Note that the decision can be made using whatever criteria are appopriate. Ignoring some or all of the function arguments is perfectly normal.

Example:

def my_decider(dependency, target, prev_ni):
    return not os.path.exists(str(target))

env.Decider(my_decider)

Default(targets), env.Default(targets)

This specifies a list of default targets, which will be built by scons if no explicit targets are given on the command line. Multiple calls to Default are legal, and add to the list of default targets.

Multiple targets should be specified as separate arguments to the Default method, or as a list. Default will also accept the Node returned by any of a construction environment's builder methods.

Examples:

Default('foo', 'bar', 'baz')
env.Default(['a', 'b', 'c'])
hello = env.Program('hello', 'hello.c')
env.Default(hello)

An argument to Default of None will clear all default targets. Later calls to Default will add to the (now empty) default-target list like normal.

The current list of targets added using the Default function or method is available in the DEFAULT_TARGETS list; see below.

DefaultEnvironment([args])

Creates and returns a default construction environment object. This construction environment is used internally by SCons in order to execute many of the global functions in this list, and to fetch source files transparently from source code management systems.

Depends(target, dependency), env.Depends(target, dependency)

Specifies an explicit dependency; the target will be rebuilt whenever the dependency has changed. Both the specified target and dependency can be a string (usually the path name of a file or directory) or Node objects, or a list of strings or Node objects (such as returned by a Builder call). This should only be necessary for cases where the dependency is not caught by a Scanner for the file.

Example:

env.Depends('foo', 'other-input-file-for-foo')

mylib = env.Library('mylib.c')
installed_lib = env.Install('lib', mylib)
bar = env.Program('bar.c')

# Arrange for the library to be copied into the installation
# directory before trying to build the "bar" program.
# (Note that this is for example only.  A "real" library
# dependency would normally be configured through the $LIBS
# and $LIBPATH variables, not using an env.Depends() call.)

env.Depends(bar, installed_lib)

env.Dictionary([vars])

Returns a dictionary object containing copies of all of the construction variables in the environment. If there are any variable names specified, only the specified construction variables are returned in the dictionary.

Example:

dict = env.Dictionary()
cc_dict = env.Dictionary('CC', 'CCFLAGS', 'CCCOM')

Dir(name, [directory]), env.Dir(name, [directory])

This returns a Directory Node, an object that represents the specified directory name. name can be a relative or absolute path. directory is an optional directory that will be used as the parent directory. If no directory is specified, the current script's directory is used as the parent.

If name is a list, SCons returns a list of Dir nodes. Construction variables are expanded in name.

Directory Nodes can be used anywhere you would supply a string as a directory name to a Builder method or function. Directory Nodes have attributes and methods that are useful in many situations; see "File and Directory Nodes," below.

env.Dump([key])

Returns a pretty printable representation of the environment. key, if not None, should be a string containing the name of the variable of interest.

This SConstruct:

env=Environment()
print env.Dump('CCCOM')

will print:

'$CC -c -o $TARGET $CCFLAGS $CPPFLAGS $_CPPDEFFLAGS $_CPPINCFLAGS $SOURCES'

While this SConstruct:

env=Environment()
print env.Dump()

will print:

{ 'AR': 'ar',
  'ARCOM': '$AR $ARFLAGS $TARGET $SOURCES\n$RANLIB $RANLIBFLAGS $TARGET',
  'ARFLAGS': ['r'],
  'AS': 'as',
  'ASCOM': '$AS $ASFLAGS -o $TARGET $SOURCES',
  'ASFLAGS': [],
  ...

EnsurePythonVersion(major, minor), env.EnsurePythonVersion(major, minor)

Ensure that the Python version is at least major.minor. This function will print out an error message and exit SCons with a non-zero exit code if the actual Python version is not late enough.

Example:

EnsurePythonVersion(2,2)

EnsureSConsVersion(major, minor, [revision]), env.EnsureSConsVersion(major, minor, [revision])

Ensure that the SCons version is at least major.minor, or major.minor.revision. if revision is specified. This function will print out an error message and exit SCons with a non-zero exit code if the actual SCons version is not late enough.

Examples:

EnsureSConsVersion(0,14)

EnsureSConsVersion(0,96,90)

Environment([key=value, ...]), env.Environment([key=value, ...])

Return a new construction environment initialized with the specified key=value pairs.

Execute(action, [strfunction, varlist]), env.Execute(action, [strfunction, varlist])

Executes an Action object. The specified action may be an Action object (see the section "Action Objects," below, for a complete explanation of the arguments and behavior), or it may be a command-line string, list of commands, or executable Python function, each of which will be converted into an Action object and then executed. The exit value of the command or return value of the Python function will be returned.

Note that scons will print an error message if the executed action fails--that is, exits with or returns a non-zero value. scons will not, however, automatically terminate the build if the specified action fails. If you want the build to stop in response to a failed Execute call, you must explicitly check for a non-zero return value:

Execute(Copy('file.out', 'file.in'))

if Execute("mkdir sub/dir/ectory"):
    # The mkdir failed, don't try to build.
    Exit(1)

Exit([value]), env.Exit([value])

This tells scons to exit immediately with the specified value. A default exit value of 0 (zero) is used if no value is specified.

Export(vars), env.Export(vars)

This tells scons to export a list of variables from the current SConscript file to all other SConscript files. The exported variables are kept in a global collection, so subsequent calls to Export will over-write previous exports that have the same name. Multiple variable names can be passed to Export as separate arguments or as a list. Keyword arguments can be used to provide names and their values. A dictionary can be used to map variables to a different name when exported. Both local variables and global variables can be exported.

Examples:

env = Environment()
# Make env available for all SConscript files to Import().
Export("env")

package = 'my_name'
# Make env and package available for all SConscript files:.
Export("env", "package")

# Make env and package available for all SConscript files:
Export(["env", "package"])

# Make env available using the name debug:
Export(debug = env)

# Make env available using the name debug:
Export({"debug":env})

Note that the SConscript function supports an exports argument that makes it easier to to export a variable or set of variables to a single SConscript file. See the description of the SConscript function, below.

File(name, [directory]), env.File(name, [directory])

This returns a File Node, an object that represents the specified file name. name can be a relative or absolute path. directory is an optional directory that will be used as the parent directory.

If name is a list, SCons returns a list of File nodes. Construction variables are expanded in name.

File Nodes can be used anywhere you would supply a string as a file name to a Builder method or function. File Nodes have attributes and methods that are useful in many situations; see "File and Directory Nodes," below.

FindFile(file, dirs), env.FindFile(file, dirs)

Search for file in the path specified by dirs. dirs may be a list of directory names or a single directory name. In addition to searching for files that exist in the filesystem, this function also searches for derived files that have not yet been built.

Example:

foo = env.FindFile('foo', ['dir1', 'dir2'])

FindInstalledFiles(), env.FindInstalledFiles()

Returns the list of targets set up by the Install or InstallAs builders.

This function serves as a convenient method to select the contents of a binary package.

Example:

Install( '/bin', [ 'executable_a', 'executable_b' ] )

# will return the file node list
# [ '/bin/executable_a', '/bin/executable_b' ]
FindInstalledFiles()

Install( '/lib', [ 'some_library' ] )

# will return the file node list
# [ '/bin/executable_a', '/bin/executable_b', '/lib/some_library' ]
FindInstalledFiles()

FindPathDirs(variable)

Returns a function (actually a callable Python object) intended to be used as the path_function of a Scanner object. The returned object will look up the specified variable in a construction environment and treat the construction variable's value as a list of directory paths that should be searched (like $CPPPATH, $LIBPATH, etc.).

Note that use of FindPathDirs is generally preferable to writing your own path_function for the following reasons: 1) The returned list will contain all appropriate directories found in source trees (when VariantDir is used) or in code repositories (when Repository or the -Y option are used). 2) scons will identify expansions of variable that evaluate to the same list of directories as, in fact, the same list, and avoid re-scanning the directories for files, when possible.

Example:

def my_scan(node, env, path, arg):
    # Code to scan file contents goes here...
    return include_files

scanner = Scanner(name = 'myscanner',
                  function = my_scan,
                  path_function = FindPathDirs('MYPATH'))

FindSourceFiles(node='"."'), env.FindSourceFiles(node='"."')

Returns the list of nodes which serve as the source of the built files. It does so by inspecting the dependency tree starting at the optional argument node which defaults to the '"."'-node. It will then return all leaves of node. These are all children which have no further children.

This function is a convenient method to select the contents of a Source Package.

Example:

Program( 'src/main_a.c' )
Program( 'src/main_b.c' )
Program( 'main_c.c' )

# returns ['main_c.c', 'src/main_a.c', 'SConstruct', 'src/main_b.c']
FindSourceFiles()

# returns ['src/main_b.c', 'src/main_a.c' ]
FindSourceFiles( 'src' )

As you can see build support files (SConstruct in the above example) will also be returned by this function.

Flatten(sequence), env.Flatten(sequence)

Takes a sequence (that is, a Python list or tuple) that may contain nested sequences and returns a flattened list containing all of the individual elements in any sequence. This can be helpful for collecting the lists returned by calls to Builders; other Builders will automatically flatten lists specified as input, but direct Python manipulation of these lists does not.

Examples:

foo = Object('foo.c')
bar = Object('bar.c')

# Because `foo' and `bar' are lists returned by the Object() Builder,
# `objects' will be a list containing nested lists:
objects = ['f1.o', foo, 'f2.o', bar, 'f3.o']

# Passing such a list to another Builder is all right because
# the Builder will flatten the list automatically:
Program(source = objects)

# If you need to manipulate the list directly using Python, you need to
# call Flatten() yourself, or otherwise handle nested lists:
for object in Flatten(objects):
    print str(object)

GetBuildFailures()

Returns a list of exceptions for the actions that failed while attempting to build targets. Each element in the returned list is a BuildError object with the following attributes that record various aspects of the build failure:

.node The node that was being built when the build failure occurred.

.status The numeric exit status returned by the command or Python function that failed when trying to build the specified Node.

.errstr The SCons error string describing the build failure. (This is often a generic message like "Error 2" to indicate that an executed command exited with a status of 2.)

.filename The name of the file or directory that actually caused the failure. This may be different from the .node attribute. For example, if an attempt to build a target named sub/dir/target fails because the sub/dir directory could not be created, then the .node attribute will be sub/dir/target but the .filename attribute will be sub/dir.

.executor The SCons Executor object for the target Node being built. This can be used to retrieve the construction environment used for the failed action.

.action The actual SCons Action object that failed. This will be one specific action out of the possible list of actions that would have been executed to build the target.

.command The actual expanded command that was executed and failed, after expansion of $TARGET, $SOURCE, and other construction variables.

Note that the GetBuildFailures function will always return an empty list until any build failure has occurred, which means that GetBuildFailures will always return an empty list while the SConscript files are being read. Its primary intended use is for functions that will be executed before SCons exits by passing them to the standard Python atexit.register() function. Example:

import atexit

def print_build_failures():
    from SCons.Script import GetBuildFailures
    for bf in GetBuildFailures():
        print "%s failed: %s" % (bf.node, bf.errstr)

atexit.register(print_build_failures)

GetBuildPath(file, [...]), env.GetBuildPath(file, [...])

Returns the scons path name (or names) for the specified file (or files). The specified file or files may be scons Nodes or strings representing path names.

GetLaunchDir(), env.GetLaunchDir()

Returns the absolute path name of the directory from which scons was initially invoked. This can be useful when using the -u, -U or -D options, which internally change to the directory in which the SConstruct file is found.

GetOption(name), env.GetOption(name)

This function provides a way to query the value of SCons options set on scons command line (or set using the SetOption function). The options supported are:

cache_debug

which corresponds to --cache-debug;

cache_disable

which corresponds to --cache-disable;

cache_force

which corresponds to --cache-force;

cache_show

which corresponds to --cache-show;

clean

which corresponds to -c, --clean and --remove;

config

which corresponds to --config;

directory

which corresponds to -C and --directory;

diskcheck

which corresponds to --diskcheck

duplicate

which corresponds to --duplicate;

file

which corresponds to -f, --file, --makefile and --sconstruct;

help

which corresponds to -h and --help;

ignore_errors

which corresponds to --ignore-errors;

implicit_cache

which corresponds to --implicit-cache;

implicit_deps_changed

which corresponds to --implicit-deps-changed;

implicit_deps_unchanged

which corresponds to --implicit-deps-unchanged;

interactive

which corresponds to --interact and --interactive;

keep_going

which corresponds to -k and --keep-going;

max_drift

which corresponds to --max-drift;

no_exec

which corresponds to -n, --no-exec, --just-print, --dry-run and --recon;

no_site_dir

which corresponds to --no-site-dir;

num_jobs

which corresponds to -j and --jobs;

profile_file

which corresponds to --profile;

question

which corresponds to -q and --question;

random

which corresponds to --random;

repository

which corresponds to -Y, --repository and --srcdir;

silent

which corresponds to -s, --silent and --quiet;

site_dir

which corresponds to --site-dir;

stack_size

which corresponds to --stack-size;

taskmastertrace_file

which corresponds to --taskmastertrace; and

warn

which corresponds to --warn and --warning.

See the documentation for the corresponding command line object for information about each specific option.

Glob(pattern, [ondisk, source, strings, exclude]), env.Glob(pattern, [ondisk, source, strings, exclude])

Returns Nodes (or strings) that match the specified pattern, relative to the directory of the current SConscript file. The env.Glob() form performs string substition on pattern and returns whatever matches the resulting expanded pattern.

The specified pattern uses Unix shell style metacharacters for matching:

  *       matches everything
  ?       matches any single character
  [seq]   matches any character in seq
  [!seq]  matches any char not in seq

If the first character of a filename is a dot, it must be matched explicitly. Character matches do not span directory separators.

The Glob knows about repositories (see the Repository function) and source directories (see the VariantDir function) and returns a Node (or string, if so configured) in the local (SConscript) directory if matching Node is found anywhere in a corresponding repository or source directory.

The ondisk argument may be set to False (or any other non-true value) to disable the search for matches on disk, thereby only returning matches among already-configured File or Dir Nodes. The default behavior is to return corresponding Nodes for any on-disk matches found.

The source argument may be set to True (or any equivalent value) to specify that, when the local directory is a VariantDir, the returned Nodes should be from the corresponding source directory, not the local directory.

The strings argument may be set to True (or any equivalent value) to have the Glob function return strings, not Nodes, that represent the matched files or directories. The returned strings will be relative to the local (SConscript) directory. (Note that This may make it easier to perform arbitrary manipulation of file names, but if the returned strings are passed to a different SConscript file, any Node translation will be relative to the other SConscript directory, not the original SConscript directory.)

The exclude argument may be set to a pattern or a list of patterns (following the same Unix shell semantics) which must be filtered out of returned elements. Elements matching a least one pattern of this list will be excluded.

Examples:

Program('foo', Glob('*.c'))
Zip('/tmp/everything', Glob('.??*') + Glob('*'))
sources = Glob('*.cpp', exclude=['os_*_specific_*.cpp']) + Glob('os_%s_specific_*.cpp'%currentOS)

Help(text, append=False), env.Help(text, append=False)

This specifies help text to be printed if the -h argument is given to scons. If Help is called multiple times, the text is appended together in the order that Help is called. With append set to False, any Help text generated with AddOption is clobbered. If append is True, the AddOption help is prepended to the help string, thus preserving the -h message.

Ignore(target, dependency), env.Ignore(target, dependency)

The specified dependency file(s) will be ignored when deciding if the target file(s) need to be rebuilt.

You can also use Ignore to remove a target from the default build. In order to do this you must specify the directory the target will be built in as the target, and the file you want to skip building as the dependency.

Note that this will only remove the dependencies listed from the files built by default. It will still be built if that dependency is needed by another object being built. See the third and forth examples below.

Examples:

env.Ignore('foo', 'foo.c')
env.Ignore('bar', ['bar1.h', 'bar2.h'])
env.Ignore('.','foobar.obj')
env.Ignore('bar','bar/foobar.obj')

Import(vars), env.Import(vars)

This tells scons to import a list of variables into the current SConscript file. This will import variables that were exported with Export or in the exports argument to SConscript. Variables exported by SConscript have precedence. Multiple variable names can be passed to Import as separate arguments or as a list. The variable "*" can be used to import all variables.

Examples:

Import("env")
Import("env", "variable")
Import(["env", "variable"])
Import("*")

Literal(string), env.Literal(string)

The specified string will be preserved as-is and not have construction variables expanded.

Local(targets), env.Local(targets)

The specified targets will have copies made in the local tree, even if an already up-to-date copy exists in a repository. Returns a list of the target Node or Nodes.

env.MergeFlags(arg, [unique])

Merges the specified arg values to the construction environment's construction variables. If the arg argument is not a dictionary, it is converted to one by calling env.ParseFlags on the argument before the values are merged. Note that arg must be a single value, so multiple strings must be passed in as a list, not as separate arguments to env.MergeFlags.

By default, duplicate values are eliminated; you can, however, specify unique=0 to allow duplicate values to be added. When eliminating duplicate values, any construction variables that end with the string PATH keep the left-most unique value. All other construction variables keep the right-most unique value.

Examples:

# Add an optimization flag to $CCFLAGS.
env.MergeFlags('-O3')

# Combine the flags returned from running pkg-config with an optimization
# flag and merge the result into the construction variables.
env.MergeFlags(['!pkg-config gtk+-2.0 --cflags', '-O3'])

# Combine an optimization flag with the flags returned from running pkg-config
# twice and merge the result into the construction variables.
env.MergeFlags(['-O3',
               '!pkg-config gtk+-2.0 --cflags --libs',
               '!pkg-config libpng12 --cflags --libs'])

NoCache(target, ...), env.NoCache(target, ...)

Specifies a list of files which should not be cached whenever the CacheDir method has been activated. The specified targets may be a list or an individual target.

Multiple files should be specified either as separate arguments to the NoCache method, or as a list. NoCache will also accept the return value of any of the construction environment Builder methods.

Calling NoCache on directories and other non-File Node types has no effect because only File Nodes are cached.

Examples:

NoCache('foo.elf')
NoCache(env.Program('hello', 'hello.c'))

NoClean(target, ...), env.NoClean(target, ...)

Specifies a list of files or directories which should not be removed whenever the targets (or their dependencies) are specified with the -c command line option. The specified targets may be a list or an individual target. Multiple calls to NoClean are legal, and prevent each specified target from being removed by calls to the -c option.

Multiple files or directories should be specified either as separate arguments to the NoClean method, or as a list. NoClean will also accept the return value of any of the construction environment Builder methods.

Calling NoClean for a target overrides calling Clean for the same target, and any targets passed to both functions will not be removed by the -c option.

Examples:

NoClean('foo.elf')
NoClean(env.Program('hello', 'hello.c'))

env.ParseConfig(command, [function, unique])

Calls the specified function to modify the environment as specified by the output of command. The default function is env.MergeFlags, which expects the output of a typical *-config command (for example, gtk-config) and adds the options to the appropriate construction variables. By default, duplicate values are not added to any construction variables; you can specify unique=0 to allow duplicate values to be added.

Interpreted options and the construction variables they affect are as specified for the env.ParseFlags method (which this method calls). See that method's description, below, for a table of options and construction variables.

ParseDepends(filename, [must_exist, only_one]), env.ParseDepends(filename, [must_exist, only_one])

Parses the contents of the specified filename as a list of dependencies in the style of Make or mkdep, and explicitly establishes all of the listed dependencies.

By default, it is not an error if the specified filename does not exist. The optional must_exist argument may be set to a non-zero value to have scons throw an exception and generate an error if the file does not exist, or is otherwise inaccessible.

The optional only_one argument may be set to a non-zero value to have scons thrown an exception and generate an error if the file contains dependency information for more than one target. This can provide a small sanity check for files intended to be generated by, for example, the gcc -M flag, which should typically only write dependency information for one output file into a corresponding .d file.

The filename and all of the files listed therein will be interpreted relative to the directory of the SConscript file which calls the ParseDepends function.

env.ParseFlags(flags, ...)

Parses one or more strings containing typical command-line flags for GCC tool chains and returns a dictionary with the flag values separated into the appropriate SCons construction variables. This is intended as a companion to the env.MergeFlags method, but allows for the values in the returned dictionary to be modified, if necessary, before merging them into the construction environment. (Note that env.MergeFlags will call this method if its argument is not a dictionary, so it is usually not necessary to call env.ParseFlags directly unless you want to manipulate the values.)

If the first character in any string is an exclamation mark (!), the rest of the string is executed as a command, and the output from the command is parsed as GCC tool chain command-line flags and added to the resulting dictionary.

Flag values are translated accordig to the prefix found, and added to the following construction variables:

-arch               CCFLAGS, LINKFLAGS
-D                  CPPDEFINES
-framework          FRAMEWORKS
-frameworkdir=      FRAMEWORKPATH
-include            CCFLAGS
-isysroot           CCFLAGS, LINKFLAGS
-I                  CPPPATH
-l                  LIBS
-L                  LIBPATH
-mno-cygwin         CCFLAGS, LINKFLAGS
-mwindows           LINKFLAGS
-pthread            CCFLAGS, LINKFLAGS
-std=               CFLAGS
-Wa,                ASFLAGS, CCFLAGS
-Wl,-rpath=         RPATH
-Wl,-R,             RPATH
-Wl,-R              RPATH
-Wl,                LINKFLAGS
-Wp,                CPPFLAGS
-                   CCFLAGS
+                   CCFLAGS, LINKFLAGS

Any other strings not associated with options are assumed to be the names of libraries and added to the $LIBS construction variable.

Examples (all of which produce the same result):

dict = env.ParseFlags('-O2 -Dfoo -Dbar=1')
dict = env.ParseFlags('-O2', '-Dfoo', '-Dbar=1')
dict = env.ParseFlags(['-O2', '-Dfoo -Dbar=1'])
dict = env.ParseFlags('-O2', '!echo -Dfoo -Dbar=1')

env.Perforce()

A factory function that returns a Builder object to be used to fetch source files from the Perforce source code management system. The returned Builder is intended to be passed to the SourceCode function.

This function is deprecated. For details, see the entry for the SourceCode function.

Example:

env.SourceCode('.', env.Perforce())

Perforce uses a number of external environment variables for its operation. Consequently, this function adds the following variables from the user's external environment to the construction environment's ENV dictionary: P4CHARSET, P4CLIENT, P4LANGUAGE, P4PASSWD, P4PORT, P4USER, SystemRoot, USER, and USERNAME.

Platform(string)

The Platform form returns a callable object that can be used to initialize a construction environment using the platform keyword of the Environment function.

Example:

env = Environment(platform = Platform('win32'))

The env.Platform form applies the callable object for the specified platform string to the environment through which the method was called.

env.Platform('posix')

Note that the win32 platform adds the SystemDrive and SystemRoot variables from the user's external environment to the construction environment's $ENV dictionary. This is so that any executed commands that use sockets to connect with other systems (such as fetching source files from external CVS repository specifications like :pserver:anonymous@cvs.sourceforge.net:/cvsroot/scons) will work on Windows systems.

Precious(target, ...), env.Precious(target, ...)

Marks each given target as precious so it is not deleted before it is rebuilt. Normally scons deletes a target before building it. Multiple targets can be passed in to a single call to Precious.

env.Prepend(key=val, [...])

Appends the specified keyword arguments to the beginning of construction variables in the environment. If the Environment does not have the specified construction variable, it is simply added to the environment. If the values of the construction variable and the keyword argument are the same type, then the two values will be simply added together. Otherwise, the construction variable and the value of the keyword argument are both coerced to lists, and the lists are added together. (See also the Append method, above.)

Example:

env.Prepend(CCFLAGS = '-g ', FOO = ['foo.yyy'])

env.PrependENVPath(name, newpath, [envname, sep, delete_existing])

This appends new path elements to the given path in the specified external environment ($ENV by default). This will only add any particular path once (leaving the first one it encounters and ignoring the rest, to preserve path order), and to help assure this, will normalize all paths (using os.path.normpath and os.path.normcase). This can also handle the case where the given old path variable is a list instead of a string, in which case a list will be returned instead of a string.

If delete_existing is 0, then adding a path that already exists will not move it to the beginning; it will stay where it is in the list.

Example:

print 'before:',env['ENV']['INCLUDE']
include_path = '/foo/bar:/foo'
env.PrependENVPath('INCLUDE', include_path)
print 'after:',env['ENV']['INCLUDE']

The above example will print:

before: /biz:/foo
after: /foo/bar:/foo:/biz

env.PrependUnique(key=val, delete_existing=0, [...])

Appends the specified keyword arguments to the beginning of construction variables in the environment. If the Environment does not have the specified construction variable, it is simply added to the environment. If the construction variable being appended to is a list, then any value(s) that already exist in the construction variable will not be added again to the list. However, if delete_existing is 1, existing matching values are removed first, so existing values in the arg list move to the front of the list.

Example:

env.PrependUnique(CCFLAGS = '-g', FOO = ['foo.yyy'])

Progress(callable, [interval]), Progress(string, [interval, file, overwrite]), Progress(list_of_strings, [interval, file, overwrite])

Allows SCons to show progress made during the build by displaying a string or calling a function while evaluating Nodes (e.g. files).

If the first specified argument is a Python callable (a function or an object that has a __call__() method), the function will be called once every interval times a Node is evaluated. The callable will be passed the evaluated Node as its only argument. (For future compatibility, it's a good idea to also add *args and **kw as arguments to your function or method. This will prevent the code from breaking if SCons ever changes the interface to call the function with additional arguments in the future.)

An example of a simple custom progress function that prints a string containing the Node name every 10 Nodes:

def my_progress_function(node, *args, **kw):
    print 'Evaluating node %s!' % node
Progress(my_progress_function, interval=10)

A more complicated example of a custom progress display object that prints a string containing a count every 100 evaluated Nodes. Note the use of \r (a carriage return) at the end so that the string will overwrite itself on a display:

import sys
class ProgressCounter(object):
    count = 0
    def __call__(self, node, *args, **kw):
        self.count += 100
        sys.stderr.write('Evaluated %s nodes\r' % self.count)
Progress(ProgressCounter(), interval=100)

If the first argument Progress is a string, the string will be displayed every interval evaluated Nodes. The default is to print the string on standard output; an alternate output stream may be specified with the file= argument. The following will print a series of dots on the error output, one dot for every 100 evaluated Nodes:

import sys
Progress('.', interval=100, file=sys.stderr)

If the string contains the verbatim substring $TARGET, it will be replaced with the Node. Note that, for performance reasons, this is not a regular SCons variable substition, so you can not use other variables or use curly braces. The following example will print the name of every evaluated Node, using a \r (carriage return) to cause each line to overwritten by the next line, and the overwrite= keyword argument to make sure the previously-printed file name is overwritten with blank spaces:

import sys
Progress('$TARGET\r', overwrite=True)

If the first argument to Progress is a list of strings, then each string in the list will be displayed in rotating fashion every interval evaluated Nodes. This can be used to implement a "spinner" on the user's screen as follows:

Progress(['-\r', '\\\r', '|\r', '/\r'], interval=5)

Pseudo(target, ...), env.Pseudo(target, ...)

This indicates that each given target should not be created by the build rule, and if the target is created, an error will be generated. This is similar to the gnu make .PHONY target. However, in the vast majority of cases, an Alias is more appropriate. Multiple targets can be passed in to a single call to Pseudo.

env.RCS()

A factory function that returns a Builder object to be used to fetch source files from RCS. The returned Builder is intended to be passed to the SourceCode function:

This function is deprecated. For details, see the entry for the SourceCode function.

Examples:

env.SourceCode('.', env.RCS())

Note that scons will fetch source files from RCS subdirectories automatically, so configuring RCS as demonstrated in the above example should only be necessary if you are fetching from RCS,v files in the same directory as the source files, or if you need to explicitly specify RCS for a specific subdirectory.

env.Replace(key=val, [...])

Replaces construction variables in the Environment with the specified keyword arguments.

Example:

env.Replace(CCFLAGS = '-g', FOO = 'foo.xxx')

Repository(directory), env.Repository(directory)

Specifies that directory is a repository to be searched for files. Multiple calls to Repository are legal, and each one adds to the list of repositories that will be searched.

To scons, a repository is a copy of the source tree, from the top-level directory on down, which may contain both source files and derived files that can be used to build targets in the local source tree. The canonical example would be an official source tree maintained by an integrator. If the repository contains derived files, then the derived files should have been built using scons, so that the repository contains the necessary signature information to allow scons to figure out when it is appropriate to use the repository copy of a derived file, instead of building one locally.

Note that if an up-to-date derived file already exists in a repository, scons will not make a copy in the local directory tree. In order to guarantee that a local copy will be made, use the Local method.

Requires(target, prerequisite), env.Requires(target, prerequisite)

Specifies an order-only relationship between the specified target file(s) and the specified prerequisite file(s). The prerequisite file(s) will be (re)built, if necessary, before the target file(s), but the target file(s) do not actually depend on the prerequisites and will not be rebuilt simply because the prerequisite file(s) change.

Example:

env.Requires('foo', 'file-that-must-be-built-before-foo')

Return([vars..., stop=])

By default, this stops processing the current SConscript file and returns to the calling SConscript file the values of the variables named in the vars string arguments. Multiple strings contaning variable names may be passed to Return. Any strings that contain white space

The optional stop= keyword argument may be set to a false value to continue processing the rest of the SConscript file after the Return call. This was the default behavior prior to SCons 0.98. However, the values returned are still the values of the variables in the named vars at the point Return is called.

Examples:

# Returns without returning a value.
Return()

# Returns the value of the 'foo' Python variable.
Return("foo")

# Returns the values of the Python variables 'foo' and 'bar'.
Return("foo", "bar")

# Returns the values of Python variables 'val1' and 'val2'.
Return('val1 val2')

Scanner(function, [argument, keys, path_function, node_class, node_factory, scan_check, recursive]), env.Scanner(function, [argument, keys, path_function, node_class, node_factory, scan_check, recursive])

Creates a Scanner object for the specified function. See the section "Scanner Objects," below, for a complete explanation of the arguments and behavior.

env.SCCS()

A factory function that returns a Builder object to be used to fetch source files from SCCS. The returned Builder is intended to be passed to the SourceCode function.

Example:

env.SourceCode('.', env.SCCS())

Note that scons will fetch source files from SCCS subdirectories automatically, so configuring SCCS as demonstrated in the above example should only be necessary if you are fetching from s.SCCS files in the same directory as the source files, or if you need to explicitly specify SCCS for a specific subdirectory.

SConscript(scripts, [exports, variant_dir, duplicate]), env.SConscript(scripts, [exports, variant_dir, duplicate]), SConscript(dirs=subdirs, [name=script, exports, variant_dir, duplicate]), env.SConscript(dirs=subdirs, [name=script, exports, variant_dir, duplicate])

This tells scons to execute one or more subsidiary SConscript (configuration) files. Any variables returned by a called script using Return will be returned by the call to SConscript. There are two ways to call the SConscript function.

The first way you can call SConscript is to explicitly specify one or more scripts as the first argument. A single script may be specified as a string; multiple scripts must be specified as a list (either explicitly or as created by a function like Split). Examples:

SConscript('SConscript')      # run SConscript in the current directory
SConscript('src/SConscript')  # run SConscript in the src directory
SConscript(['src/SConscript', 'doc/SConscript'])
config = SConscript('MyConfig.py')

The second way you can call SConscript is to specify a list of (sub)directory names as a dirs=subdirs keyword argument. In this case, scons will, by default, execute a subsidiary configuration file named SConscript in each of the specified directories. You may specify a name other than SConscript by supplying an optional name=script keyword argument. The first three examples below have the same effect as the first three examples above:

SConscript(dirs='.')      # run SConscript in the current directory
SConscript(dirs='src')    # run SConscript in the src directory
SConscript(dirs=['src', 'doc'])
SConscript(dirs=['sub1', 'sub2'], name='MySConscript')

The optional exports argument provides a list of variable names or a dictionary of named values to export to the script(s). These variables are locally exported only to the specified script(s), and do not affect the global pool of variables used by the Export function. The subsidiary script(s) must use the Import function to import the variables. Examples:

foo = SConscript('sub/SConscript', exports='env')
SConscript('dir/SConscript', exports=['env', 'variable'])
SConscript(dirs='subdir', exports='env variable')
SConscript(dirs=['one', 'two', 'three'], exports='shared_info')

If the optional variant_dir argument is present, it causes an effect equivalent to the VariantDir method described below. (If variant_dir is not present, the

duplicate argument is ignored.) The variant_dir argument is interpreted relative to the directory of the calling SConscript file. See the description of the VariantDir function below for additional details and restrictions.

If variant_dir is present, the source directory is the directory in which the SConscript file resides and the SConscript file is evaluated as if it were in the variant_dir directory:

SConscript('src/SConscript', variant_dir = 'build')

is equivalent to

VariantDir('build', 'src')
SConscript('build/SConscript')

This later paradigm is often used when the sources are in the same directory as the SConstruct:

SConscript('SConscript', variant_dir = 'build')

is equivalent to

VariantDir('build', '.')
SConscript('build/SConscript')

Here are some composite examples:

# collect the configuration information and use it to build src and doc
shared_info = SConscript('MyConfig.py')
SConscript('src/SConscript', exports='shared_info')
SConscript('doc/SConscript', exports='shared_info')

# build debugging and production versions.  SConscript
# can use Dir('.').path to determine variant.
SConscript('SConscript', variant_dir='debug', duplicate=0)
SConscript('SConscript', variant_dir='prod', duplicate=0)

# build debugging and production versions.  SConscript
# is passed flags to use.
opts = { 'CPPDEFINES' : ['DEBUG'], 'CCFLAGS' : '-pgdb' }
SConscript('SConscript', variant_dir='debug', duplicate=0, exports=opts)
opts = { 'CPPDEFINES' : ['NODEBUG'], 'CCFLAGS' : '-O' }
SConscript('SConscript', variant_dir='prod', duplicate=0, exports=opts)

# build common documentation and compile for different architectures
SConscript('doc/SConscript', variant_dir='build/doc', duplicate=0)
SConscript('src/SConscript', variant_dir='build/x86', duplicate=0)
SConscript('src/SConscript', variant_dir='build/ppc', duplicate=0)

SConscriptChdir(value), env.SConscriptChdir(value)

By default, scons changes its working directory to the directory in which each subsidiary SConscript file lives. This behavior may be disabled by specifying either:

SConscriptChdir(0)
env.SConscriptChdir(0)

in which case scons will stay in the top-level directory while reading all SConscript files. (This may be necessary when building from repositories, when all the directories in which SConscript files may be found don't necessarily exist locally.) You may enable and disable this ability by calling SConscriptChdir() multiple times.

Example:

env = Environment()
SConscriptChdir(0)
SConscript('foo/SConscript')    # will not chdir to foo
env.SConscriptChdir(1)
SConscript('bar/SConscript')    # will chdir to bar

SConsignFile([file, dbm_module]), env.SConsignFile([file, dbm_module])

This tells scons to store all file signatures in the specified database file. If the file name is omitted, .sconsign is used by default. (The actual file name(s) stored on disk may have an appropriated suffix appended by the dbm_module.) If file is not an absolute path name, the file is placed in the same directory as the top-level SConstruct file.

If file is None, then scons will store file signatures in a separate .sconsign file in each directory, not in one global database file. (This was the default behavior prior to SCons 0.96.91 and 0.97.)

The optional dbm_module argument can be used to specify which Python database module The default is to use a custom SCons.dblite module that uses pickled Python data structures, and which works on all Python versions.

Examples:

# Explicitly stores signatures in ".sconsign.dblite"
# in the top-level SConstruct directory (the
# default behavior).
SConsignFile()

# Stores signatures in the file "etc/scons-signatures"
# relative to the top-level SConstruct directory.
SConsignFile("etc/scons-signatures")

# Stores signatures in the specified absolute file name.
SConsignFile("/home/me/SCons/signatures")

# Stores signatures in a separate .sconsign file
# in each directory.
SConsignFile(None)

env.SetDefault(key=val, [...])

Sets construction variables to default values specified with the keyword arguments if (and only if) the variables are not already set. The following statements are equivalent:

env.SetDefault(FOO = 'foo')

if 'FOO' not in env: env['FOO'] = 'foo'

SetOption(name, value), env.SetOption(name, value)

This function provides a way to set a select subset of the scons command line options from a SConscript file. The options supported are:

clean

which corresponds to -c, --clean and --remove;

duplicate

which corresponds to --duplicate;

help

which corresponds to -h and --help;

implicit_cache

which corresponds to --implicit-cache;

max_drift

which corresponds to --max-drift;

no_exec

which corresponds to -n, --no-exec, --just-print, --dry-run and --recon;

num_jobs

which corresponds to -j and --jobs;

random

which corresponds to --random; and

stack_size

which corresponds to --stack-size.

See the documentation for the corresponding command line object for information about each specific option.

Example:

SetOption('max_drift', 1)

SideEffect(side_effect, target), env.SideEffect(side_effect, target)

Declares side_effect as a side effect of building target. Both side_effect and target can be a list, a file name, or a node. A side effect is a target file that is created or updated as a side effect of building other targets. For example, a Windows PDB file is created as a side effect of building the .obj files for a static library, and various log files are created updated as side effects of various TeX commands. If a target is a side effect of multiple build commands, scons will ensure that only one set of commands is executed at a time. Consequently, you only need to use this method for side-effect targets that are built as a result of multiple build commands.

Because multiple build commands may update the same side effect file, by default the side_effect target is not automatically removed when the target is removed by the -c option. (Note, however, that the side_effect might be removed as part of cleaning the directory in which it lives.) If you want to make sure the side_effect is cleaned whenever a specific target is cleaned, you must specify this explicitly with the Clean or env.Clean function.

SourceCode(entries, builder), env.SourceCode(entries, builder)

This function and its associate factory functions are deprecated. There is no replacement. The intended use was to keep a local tree in sync with an archive, but in actuality the function only causes the archive to be fetched on the first run. Synchronizing with the archive is best done external to SCons.

Arrange for non-existent source files to be fetched from a source code management system using the specified builder. The specified entries may be a Node, string or list of both, and may represent either individual source files or directories in which source files can be found.

For any non-existent source files, scons will search up the directory tree and use the first SourceCode builder it finds. The specified builder may be None, in which case scons will not use a builder to fetch source files for the specified entries, even if a SourceCode builder has been specified for a directory higher up the tree.

scons will, by default, fetch files from SCCS or RCS subdirectories without explicit configuration. This takes some extra processing time to search for the necessary source code management files on disk. You can avoid these extra searches and speed up your build a little by disabling these searches as follows:

env.SourceCode('.', None)

Note that if the specified builder is one you create by hand, it must have an associated construction environment to use when fetching a source file.

scons provides a set of canned factory functions that return appropriate Builders for various popular source code management systems. Canonical examples of invocation include:

env.SourceCode('.', env.BitKeeper('/usr/local/BKsources'))
env.SourceCode('src', env.CVS('/usr/local/CVSROOT'))
env.SourceCode('/', env.RCS())
env.SourceCode(['f1.c', 'f2.c'], env.SCCS())
env.SourceCode('no_source.c', None)

SourceSignatures(type), env.SourceSignatures(type)

Note: Although it is not yet officially deprecated, use of this function is discouraged. See the Decider function for a more flexible and straightforward way to configure SCons' decision-making.

The SourceSignatures function tells scons how to decide if a source file (a file that is not built from any other files) has changed since the last time it was used to build a particular target file. Legal values are MD5 or timestamp.

If the environment method is used, the specified type of source signature is only used when deciding whether targets built with that environment are up-to-date or must be rebuilt. If the global function is used, the specified type of source signature becomes the default used for all decisions about whether targets are up-to-date.

MD5 means scons decides that a source file has changed if the MD5 checksum of its contents has changed since the last time it was used to rebuild a particular target file.

timestamp means scons decides that a source file has changed if its timestamp (modification time) has changed since the last time it was used to rebuild a particular target file. (Note that although this is similar to the behavior of Make, by default it will also rebuild if the dependency is older than the last time it was used to rebuild the target file.)

There is no different between the two behaviors for Python Value node objects.

MD5 signatures take longer to compute, but are more accurate than timestamp signatures. The default value is MD5.

Note that the default TargetSignatures setting (see below) is to use this SourceSignatures setting for any target files that are used to build other target files. Consequently, changing the value of SourceSignatures will, by default, affect the up-to-date decision for all files in the build (or all files built with a specific construction environment when env.SourceSignatures is used).

Split(arg), env.Split(arg)

Returns a list of file names or other objects. If arg is a string, it will be split on strings of white-space characters within the string, making it easier to write long lists of file names. If arg is already a list, the list will be returned untouched. If arg is any other type of object, it will be returned as a list containing just the object.

Example:

files = Split("f1.c f2.c f3.c")
files = env.Split("f4.c f5.c f6.c")
files = Split("""
        f7.c
        f8.c
        f9.c
""")

env.subst(input, [raw, target, source, conv])

Performs construction variable interpolation on the specified string or sequence argument input.

By default, leading or trailing white space will be removed from the result. and all sequences of white space will be compressed to a single space character. Additionally, any $( and $) character sequences will be stripped from the returned string, The optional raw argument may be set to 1 if you want to preserve white space and $(-$) sequences. The raw argument may be set to 2 if you want to strip all characters between any $( and $) pairs (as is done for signature calculation).

If the input is a sequence (list or tuple), the individual elements of the sequence will be expanded, and the results will be returned as a list.

The optional target and source keyword arguments must be set to lists of target and source nodes, respectively, if you want the $TARGET, $TARGETS, $SOURCE and $SOURCES to be available for expansion. This is usually necessary if you are calling env.subst from within a Python function used as an SCons action.

Returned string values or sequence elements are converted to their string representation by default. The optional conv argument may specify a conversion function that will be used in place of the default. For example, if you want Python objects (including SCons Nodes) to be returned as Python objects, you can use the Python Λ idiom to pass in an unnamed function that simply returns its unconverted argument.

Example:

print env.subst("The C compiler is: $CC")

def compile(target, source, env):
    sourceDir = env.subst("${SOURCE.srcdir}",
                          target=target,
                          source=source)

source_nodes = env.subst('$EXPAND_TO_NODELIST',
                         conv=lambda x: x)

Tag(node, tags)

Annotates file or directory Nodes with information about how the Package Builder should package those files or directories. All tags are optional.

Examples:

# makes sure the built library will be installed with 0644 file
# access mode
Tag( Library( 'lib.c' ), UNIX_ATTR="0644" )

# marks file2.txt to be a documentation file
Tag( 'file2.txt', DOC )

TargetSignatures(type), env.TargetSignatures(type)

Note: Although it is not yet officially deprecated, use of this function is discouraged. See the Decider function for a more flexible and straightforward way to configure SCons' decision-making.

The TargetSignatures function tells scons how to decide if a target file (a file that is built from any other files) has changed since the last time it was used to build some other target file. Legal values are "build"; "content" (or its synonym "MD5"); "timestamp"; or "source".

If the environment method is used, the specified type of target signature is only used for targets built with that environment. If the global function is used, the specified type of signature becomes the default used for all target files that don't have an explicit target signature type specified for their environments.

"content" (or its synonym "MD5") means scons decides that a target file has changed if the MD5 checksum of its contents has changed since the last time it was used to rebuild some other target file. This means scons will open up MD5 sum the contents of target files after they're built, and may decide that it does not need to rebuild "downstream" target files if a file was rebuilt with exactly the same contents as the last time.

"timestamp" means scons decides that a target file has changed if its timestamp (modification time) has changed since the last time it was used to rebuild some other target file. (Note that although this is similar to the behavior of Make, by default it will also rebuild if the dependency is older than the last time it was used to rebuild the target file.)

"source" means scons decides that a target file has changed as specified by the corresponding SourceSignatures setting ("MD5" or "timestamp"). This means that scons will treat all input files to a target the same way, regardless of whether they are source files or have been built from other files.

"build" means scons decides that a target file has changed if it has been rebuilt in this invocation or if its content or timestamp have changed as specified by the corresponding SourceSignatures setting. This "propagates" the status of a rebuilt file so that other "downstream" target files will always be rebuilt, even if the contents or the timestamp have not changed.

"build" signatures are fastest because "content" (or "MD5") signatures take longer to compute, but are more accurate than "timestamp" signatures, and can prevent unnecessary "downstream" rebuilds when a target file is rebuilt to the exact same contents as the previous build. The "source" setting provides the most consistent behavior when other target files may be rebuilt from both source and target input files. The default value is "source".

Because the default setting is "source", using SourceSignatures is generally preferable to TargetSignatures, so that the up-to-date decision will be consistent for all files (or all files built with a specific construction environment). Use of TargetSignatures provides specific control for how built target files affect their "downstream" dependencies.

Tool(string, [toolpath, **kw]), env.Tool(string, [toolpath, **kw])

The Tool form of the function returns a callable object that can be used to initialize a construction environment using the tools keyword of the Environment() method. The object may be called with a construction environment as an argument, in which case the object will add the necessary variables to the construction environment and the name of the tool will be added to the $TOOLS construction variable.

Additional keyword arguments are passed to the tool's generate() method.

Examples:

env = Environment(tools = [ Tool('msvc') ])

env = Environment()
t = Tool('msvc')
t(env)  # adds 'msvc' to the TOOLS variable
u = Tool('opengl', toolpath = ['tools'])
u(env)  # adds 'opengl' to the TOOLS variable

The env.Tool form of the function applies the callable object for the specified tool string to the environment through which the method was called.

Additional keyword arguments are passed to the tool's generate() method.

env.Tool('gcc')
env.Tool('opengl', toolpath = ['build/tools'])

Value(value, [built_value]), env.Value(value, [built_value])

Returns a Node object representing the specified Python value. Value Nodes can be used as dependencies of targets. If the result of calling str(value) changes between SCons runs, any targets depending on Value(value) will be rebuilt. (This is true even when using timestamps to decide if files are up-to-date.) When using timestamp source signatures, Value Nodes' timestamps are equal to the system time when the Node is created.

The returned Value Node object has a write() method that can be used to "build" a Value Node by setting a new value. The optional built_value argument can be specified when the Value Node is created to indicate the Node should already be considered "built." There is a corresponding read() method that will return the built value of the Node.

Examples:

env = Environment()

def create(target, source, env):
    # A function that will write a 'prefix=$SOURCE'
    # string into the file name specified as the
    # $TARGET.
    f = open(str(target[0]), 'wb')
    f.write('prefix=' + source[0].get_contents())

# Fetch the prefix= argument, if any, from the command
# line, and use /usr/local as the default.
prefix = ARGUMENTS.get('prefix', '/usr/local')

# Attach a .Config() builder for the above function action
# to the construction environment.
env['BUILDERS']['Config'] = Builder(action = create)
env.Config(target = 'package-config', source = Value(prefix))

def build_value(target, source, env):
    # A function that "builds" a Python Value by updating
    # the the Python value with the contents of the file
    # specified as the source of the Builder call ($SOURCE).
    target[0].write(source[0].get_contents())

output = env.Value('before')
input = env.Value('after')

# Attach a .UpdateValue() builder for the above function
# action to the construction environment.
env['BUILDERS']['UpdateValue'] = Builder(action = build_value)
env.UpdateValue(target = Value(output), source = Value(input))

VariantDir(variant_dir, src_dir, [duplicate]), env.VariantDir(variant_dir, src_dir, [duplicate])

Use the VariantDir function to create a copy of your sources in another location: if a name under variant_dir is not found but exists under src_dir, the file or directory is copied to variant_dir. Target files can be built in a different directory than the original sources by simply refering to the sources (and targets) within the variant tree.

VariantDir can be called multiple times with the same src_dir to set up multiple builds with different options (variants). The src_dir location must be in or underneath the SConstruct file's directory, and variant_dir may not be underneath src_dir.

The default behavior is for scons to physically duplicate the source files in the variant tree. Thus, a build performed in the variant tree is guaranteed to be identical to a build performed in the source tree even if intermediate source files are generated during the build, or preprocessors or other scanners search for included files relative to the source file, or individual compilers or other invoked tools are hard-coded to put derived files in the same directory as source files.

If possible on the platform, the duplication is performed by linking rather than copying; see also the --duplicate command-line option. Moreover, only the files needed for the build are duplicated; files and directories that are not used are not present in variant_dir.

Duplicating the source tree may be disabled by setting the duplicate argument to 0 (zero). This will cause scons to invoke Builders using the path names of source files in src_dir and the path names of derived files within variant_dir. This is always more efficient than duplicate=1, and is usually safe for most builds (but see above for cases that may cause problems).

Note that VariantDir works most naturally with a subsidiary SConscript file. However, you would then call the subsidiary SConscript file not in the source directory, but in the variant_dir, regardless of the value of duplicate. This is how you tell scons which variant of a source tree to build:

# run src/SConscript in two variant directories
VariantDir('build/variant1', 'src')
SConscript('build/variant1/SConscript')
VariantDir('build/variant2', 'src')
SConscript('build/variant2/SConscript')

See also the SConscript function, described above, for another way to specify a variant directory in conjunction with calling a subsidiary SConscript file.

Examples:

# use names in the build directory, not the source directory
VariantDir('build', 'src', duplicate=0)
Program('build/prog', 'build/source.c')

# this builds both the source and docs in a separate subtree
VariantDir('build', '.', duplicate=0)
SConscript(dirs=['build/src','build/doc'])

# same as previous example, but only uses SConscript
SConscript(dirs='src', variant_dir='build/src', duplicate=0)
SConscript(dirs='doc', variant_dir='build/doc', duplicate=0)

WhereIs(program, [path, pathext, reject]), env.WhereIs(program, [path, pathext, reject])

Searches for the specified executable program, returning the full path name to the program if it is found, and returning None if not. Searches the specified path, the value of the calling environment's PATH (env['ENV']['PATH']), or the user's current external PATH (os.environ['PATH']) by default. On Windows systems, searches for executable programs with any of the file extensions listed in the specified pathext, the calling environment's PATHEXT (env['ENV']['PATHEXT']) or the user's current PATHEXT (os.environ['PATHEXT']) by default. Will not select any path name or names in the specified reject list, if any.

SConscript Variables

In addition to the global functions and methods, scons supports a number of Python variables that can be used in SConscript files to affect how you want the build to be performed. These variables may be accessed from custom Python modules that you import into an SConscript file by adding the following to the Python module:

from SCons.Script import *

ARGLIST

A list keyword=value arguments specified on the command line. Each element in the list is a tuple containing the (keyword,value) of the argument. The separate keyword and value elements of the tuple can be accessed by subscripting for element [0] and [1] of the tuple, respectively.

Example:

print "first keyword, value =", ARGLIST[0][0], ARGLIST[0][1]
print "second keyword, value =", ARGLIST[1][0], ARGLIST[1][1]
third_tuple = ARGLIST[2]
print "third keyword, value =", third_tuple[0], third_tuple[1]
for key, value in ARGLIST:
    # process key and value

ARGUMENTS

A dictionary of all the keyword=value arguments specified on the command line. The dictionary is not in order, and if a given keyword has more than one value assigned to it on the command line, the last (right-most) value is the one in the ARGUMENTS dictionary.

Example:

if ARGUMENTS.get('debug', 0):
    env = Environment(CCFLAGS = '-g')
else:
    env = Environment()

BUILD_TARGETS

A list of the targets which scons will actually try to build, regardless of whether they were specified on the command line or via the Default() function or method. The elements of this list may be strings or nodes, so you should run the list through the Python str function to make sure any Node path names are converted to strings.

Because this list may be taken from the list of targets specified using the Default() function or method, the contents of the list may change on each successive call to Default(). See the DEFAULT_TARGETS list, below, for additional information.

Example:

if 'foo' in BUILD_TARGETS:
    print "Don't forget to test the `foo' program!"
if 'special/program' in BUILD_TARGETS:
    SConscript('special')

Note that the BUILD_TARGETS list only contains targets expected listed on the command line or via calls to the Default() function or method. It does not contain all dependent targets that will be built as a result of making the sure the explicitly-specified targets are up to date.

COMMAND_LINE_TARGETS

A list of the targets explicitly specified on the command line. If there are no targets specified on the command line, the list is empty. This can be used, for example, to take specific actions only when a certain target or targets is explicitly being built.

Example:

if 'foo' in COMMAND_LINE_TARGETS:
    print "Don't forget to test the `foo' program!"
if 'special/program' in COMMAND_LINE_TARGETS:
    SConscript('special')

DEFAULT_TARGETS

A list of the target nodes that have been specified using the Default() function or method. The elements of the list are nodes, so you need to run them through the Python str function to get at the path name for each Node.

Example:

print str(DEFAULT_TARGETS[0])
if 'foo' in map(str, DEFAULT_TARGETS):
    print "Don't forget to test the `foo' program!"

The contents of the DEFAULT_TARGETS list change on on each successive call to the Default() function:

print map(str, DEFAULT_TARGETS)   # originally []
Default('foo')
print map(str, DEFAULT_TARGETS)   # now a node ['foo']
Default('bar')
print map(str, DEFAULT_TARGETS)   # now a node ['foo', 'bar']
Default(None)
print map(str, DEFAULT_TARGETS)   # back to []

Consequently, be sure to use DEFAULT_TARGETS only after you've made all of your Default() calls, or else simply be careful of the order of these statements in your SConscript files so that you don't look for a specific default target before it's actually been added to the list.  

Construction Variables

A construction environment has an associated dictionary of construction variables that are used by built-in or user-supplied build rules. Construction variables must follow the same rules for Python identifiers: the initial character must be an underscore or letter, followed by any number of underscores, letters, or digits.

A number of useful construction variables are automatically defined by scons for each supported platform, and additional construction variables can be defined by the user. The following is a list of the automatically defined construction variables:

__LDMODULEVERSIONFLAGS

This construction variable automatically introduces $_LDMODULEVERSIONFLAGS if $LDMODULEVERSION is set. Othervise it evaluates to an empty string.

__SHLIBVERSIONFLAGS

This construction variable automatically introduces $_SHLIBVERSIONFLAGS if $SHLIBVERSION is set. Othervise it evaluates to an empty string.

AR

The static library archiver.

ARCHITECTURE

Specifies the system architecture for which the package is being built. The default is the system architecture of the machine on which SCons is running. This is used to fill in the Architecture: field in an Ipkg control file, and as part of the name of a generated RPM file.

ARCOM

The command line used to generate a static library from object files.

ARCOMSTR

The string displayed when an object file is generated from an assembly-language source file. If this is not set, then $ARCOM (the command line) is displayed.

env = Environment(ARCOMSTR = "Archiving $TARGET")

ARFLAGS

General options passed to the static library archiver.

AS

The assembler.

ASCOM

The command line used to generate an object file from an assembly-language source file.

ASCOMSTR

The string displayed when an object file is generated from an assembly-language source file. If this is not set, then $ASCOM (the command line) is displayed.

env = Environment(ASCOMSTR = "Assembling $TARGET")

ASFLAGS

General options passed to the assembler.

ASPPCOM

The command line used to assemble an assembly-language source file into an object file after first running the file through the C preprocessor. Any options specified in the $ASFLAGS and $CPPFLAGS construction variables are included on this command line.

ASPPCOMSTR

The string displayed when an object file is generated from an assembly-language source file after first running the file through the C preprocessor. If this is not set, then $ASPPCOM (the command line) is displayed.

env = Environment(ASPPCOMSTR = "Assembling $TARGET")

ASPPFLAGS

General options when an assembling an assembly-language source file into an object file after first running the file through the C preprocessor. The default is to use the value of $ASFLAGS.

BIBTEX

The bibliography generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

BIBTEXCOM

The command line used to call the bibliography generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

BIBTEXCOMSTR

The string displayed when generating a bibliography for TeX or LaTeX. If this is not set, then $BIBTEXCOM (the command line) is displayed.

env = Environment(BIBTEXCOMSTR = "Generating bibliography $TARGET")

BIBTEXFLAGS

General options passed to the bibliography generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

BITKEEPER

The BitKeeper executable.

BITKEEPERCOM

The command line for fetching source files using BitKeeper.

BITKEEPERCOMSTR

The string displayed when fetching a source file using BitKeeper. If this is not set, then $BITKEEPERCOM (the command line) is displayed.

BITKEEPERGET

The command ($BITKEEPER) and subcommand for fetching source files using BitKeeper.

BITKEEPERGETFLAGS

Options that are passed to the BitKeeper get subcommand.

BUILDERS

A dictionary mapping the names of the builders available through this environment to underlying Builder objects. Builders named Alias, CFile, CXXFile, DVI, Library, Object, PDF, PostScript, and Program are available by default. If you initialize this variable when an Environment is created:

env = Environment(BUILDERS = {'NewBuilder' : foo})

the default Builders will no longer be available. To use a new Builder object in addition to the default Builders, add your new Builder object like this:

env = Environment()
env.Append(BUILDERS = {'NewBuilder' : foo})

or this:

env = Environment()
env['BUILDERS]['NewBuilder'] = foo

CC

The C compiler.

CCCOM

The command line used to compile a C source file to a (static) object file. Any options specified in the $CFLAGS, $CCFLAGS and $CPPFLAGS construction variables are included on this command line.

CCCOMSTR

The string displayed when a C source file is compiled to a (static) object file. If this is not set, then $CCCOM (the command line) is displayed.

env = Environment(CCCOMSTR = "Compiling static object $TARGET")

CCFLAGS

General options that are passed to the C and C++ compilers.

CCPCHFLAGS

Options added to the compiler command line to support building with precompiled headers. The default value expands expands to the appropriate Microsoft Visual C++ command-line options when the $PCH construction variable is set.

CCPDBFLAGS

Options added to the compiler command line to support storing debugging information in a Microsoft Visual C++ PDB file. The default value expands expands to appropriate Microsoft Visual C++ command-line options when the $PDB construction variable is set.

The Visual C++ compiler option that SCons uses by default to generate PDB information is /Z7. This works correctly with parallel (-j) builds because it embeds the debug information in the intermediate object files, as opposed to sharing a single PDB file between multiple object files. This is also the only way to get debug information embedded into a static library. Using the /Zi instead may yield improved link-time performance, although parallel builds will no longer work.

You can generate PDB files with the /Zi switch by overriding the default $CCPDBFLAGS variable as follows:

env['CCPDBFLAGS'] = ['${(PDB and "/Zi /Fd%s" % File(PDB)) or ""}']

An alternative would be to use the /Zi to put the debugging information in a separate .pdb file for each object file by overriding the $CCPDBFLAGS variable as follows:

env['CCPDBFLAGS'] = '/Zi /Fd${TARGET}.pdb'

CCVERSION

The version number of the C compiler. This may or may not be set, depending on the specific C compiler being used.

CFILESUFFIX

The suffix for C source files. This is used by the internal CFile builder when generating C files from Lex (.l) or YACC (.y) input files. The default suffix, of course, is .c (lower case). On case-insensitive systems (like Windows), SCons also treats .C (upper case) files as C files.

CFLAGS

General options that are passed to the C compiler (C only; not C++).

CHANGE_SPECFILE

A hook for modifying the file that controls the packaging build (the .spec for RPM, the control for Ipkg, the .wxs for MSI). If set, the function will be called after the SCons template for the file has been written. XXX

CHANGED_SOURCES

A reserved variable name that may not be set or used in a construction environment. (See "Variable Substitution," below.)

CHANGED_TARGETS

A reserved variable name that may not be set or used in a construction environment. (See "Variable Substitution," below.)

CHANGELOG

The name of a file containing the change log text to be included in the package. This is included as the %changelog section of the RPM .spec file.

_concat

A function used to produce variables like $_CPPINCFLAGS. It takes four or five arguments: a prefix to concatenate onto each element, a list of elements, a suffix to concatenate onto each element, an environment for variable interpolation, and an optional function that will be called to transform the list before concatenation.

env['_CPPINCFLAGS'] = '$( ${_concat(INCPREFIX, CPPPATH, INCSUFFIX, __env__, RDirs)} $)',

CONFIGUREDIR

The name of the directory in which Configure context test files are written. The default is .sconf_temp in the top-level directory containing the SConstruct file.

CONFIGURELOG

The name of the Configure context log file. The default is config.log in the top-level directory containing the SConstruct file.

_CPPDEFFLAGS

An automatically-generated construction variable containing the C preprocessor command-line options to define values. The value of $_CPPDEFFLAGS is created by appending $CPPDEFPREFIX and $CPPDEFSUFFIX to the beginning and end of each definition in $CPPDEFINES.

CPPDEFINES

A platform independent specification of C preprocessor definitions. The definitions will be added to command lines through the automatically-generated $_CPPDEFFLAGS construction variable (see above), which is constructed according to the type of value of $CPPDEFINES:

If $CPPDEFINES is a string, the values of the $CPPDEFPREFIX and $CPPDEFSUFFIX construction variables will be added to the beginning and end.

# Will add -Dxyz to POSIX compiler command lines,
# and /Dxyz to Microsoft Visual C++ command lines.
env = Environment(CPPDEFINES='xyz')

If $CPPDEFINES is a list, the values of the $CPPDEFPREFIX and $CPPDEFSUFFIX construction variables will be appended to the beginning and end of each element in the list. If any element is a list or tuple, then the first item is the name being defined and the second item is its value:

# Will add -DB=2 -DA to POSIX compiler command lines,
# and /DB=2 /DA to Microsoft Visual C++ command lines.
env = Environment(CPPDEFINES=[('B', 2), 'A'])

If $CPPDEFINES is a dictionary, the values of the $CPPDEFPREFIX and $CPPDEFSUFFIX construction variables will be appended to the beginning and end of each item from the dictionary. The key of each dictionary item is a name being defined to the dictionary item's corresponding value; if the value is None, then the name is defined without an explicit value. Note that the resulting flags are sorted by keyword to ensure that the order of the options on the command line is consistent each time scons is run.

# Will add -DA -DB=2 to POSIX compiler command lines,
# and /DA /DB=2 to Microsoft Visual C++ command lines.
env = Environment(CPPDEFINES={'B':2, 'A':None})

CPPDEFPREFIX

The prefix used to specify preprocessor definitions on the C compiler command line. This will be appended to the beginning of each definition in the $CPPDEFINES construction variable when the $_CPPDEFFLAGS variable is automatically generated.

CPPDEFSUFFIX

The suffix used to specify preprocessor definitions on the C compiler command line. This will be appended to the end of each definition in the $CPPDEFINES construction variable when the $_CPPDEFFLAGS variable is automatically generated.

CPPFLAGS

User-specified C preprocessor options. These will be included in any command that uses the C preprocessor, including not just compilation of C and C++ source files via the $CCCOM, $SHCCCOM, $CXXCOM and $SHCXXCOM command lines, but also the $FORTRANPPCOM, $SHFORTRANPPCOM, $F77PPCOM and $SHF77PPCOM command lines used to compile a Fortran source file, and the $ASPPCOM command line used to assemble an assembly language source file, after first running each file through the C preprocessor. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $CPPPATH. See $_CPPINCFLAGS, below, for the variable that expands to those options.

_CPPINCFLAGS

An automatically-generated construction variable containing the C preprocessor command-line options for specifying directories to be searched for include files. The value of $_CPPINCFLAGS is created by appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $CPPPATH.

CPPPATH

The list of directories that the C preprocessor will search for include directories. The C/C++ implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in CCFLAGS or CXXFLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in CPPPATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #:

env = Environment(CPPPATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(CPPPATH=include)

The directory list will be added to command lines through the automatically-generated $_CPPINCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $CPPPATH. Any command lines you define that need the CPPPATH directory list should include $_CPPINCFLAGS:

env = Environment(CCCOM="my_compiler $_CPPINCFLAGS -c -o $TARGET $SOURCE")

CPPSUFFIXES

The list of suffixes of files that will be scanned for C preprocessor implicit dependencies (#include lines). The default list is:

[".c", ".C", ".cxx", ".cpp", ".c++", ".cc",
 ".h", ".H", ".hxx", ".hpp", ".hh",
 ".F", ".fpp", ".FPP",
 ".m", ".mm",
 ".S", ".spp", ".SPP"]

CVS

The CVS executable.

CVSCOFLAGS

Options that are passed to the CVS checkout subcommand.

CVSCOM

The command line used to fetch source files from a CVS repository.

CVSCOMSTR

The string displayed when fetching a source file from a CVS repository. If this is not set, then $CVSCOM (the command line) is displayed.

CVSFLAGS

General options that are passed to CVS. By default, this is set to -d $CVSREPOSITORY to specify from where the files must be fetched.

CVSREPOSITORY

The path to the CVS repository. This is referenced in the default $CVSFLAGS value.

CXX

The C++ compiler.

CXXCOM

The command line used to compile a C++ source file to an object file. Any options specified in the $CXXFLAGS and $CPPFLAGS construction variables are included on this command line.

CXXCOMSTR

The string displayed when a C++ source file is compiled to a (static) object file. If this is not set, then $CXXCOM (the command line) is displayed.

env = Environment(CXXCOMSTR = "Compiling static object $TARGET")

CXXFILESUFFIX

The suffix for C++ source files. This is used by the internal CXXFile builder when generating C++ files from Lex (.ll) or YACC (.yy) input files. The default suffix is .cc. SCons also treats files with the suffixes .cpp, .cxx, .c++, and .C++ as C++ files, and files with .mm suffixes as Objective C++ files. On case-sensitive systems (Linux, UNIX, and other POSIX-alikes), SCons also treats .C (upper case) files as C++ files.

CXXFLAGS

General options that are passed to the C++ compiler. By default, this includes the value of $CCFLAGS, so that setting $CCFLAGS affects both C and C++ compilation. If you want to add C++-specific flags, you must set or override the value of $CXXFLAGS.

CXXVERSION

The version number of the C++ compiler. This may or may not be set, depending on the specific C++ compiler being used.

DC

DC.

DCOM

DCOM.

DDEBUG

DDEBUG.

_DDEBUGFLAGS

_DDEBUGFLAGS.

DDEBUGPREFIX

DDEBUGPREFIX.

DDEBUGSUFFIX

DDEBUGSUFFIX.

DESCRIPTION

A long description of the project being packaged. This is included in the relevant section of the file that controls the packaging build.

DESCRIPTION_lang

A language-specific long description for the specified lang. This is used to populate a %description -l section of an RPM .spec file.

DFILESUFFIX

DFILESUFFIX.

DFLAGPREFIX

DFLAGPREFIX.

DFLAGS

DFLAGS.

_DFLAGS

_DFLAGS.

DFLAGSUFFIX

DFLAGSUFFIX.

_DINCFLAGS

_DINCFLAGS.

DINCPREFIX

DINCPREFIX.

DINCSUFFIX

DINCSUFFIX.

Dir

A function that converts a string into a Dir instance relative to the target being built.

A function that converts a string into a Dir instance relative to the target being built.

Dirs

A function that converts a list of strings into a list of Dir instances relative to the target being built.

DLIB

DLIB.

DLIBCOM

DLIBCOM.

_DLIBDIRFLAGS

_DLIBDIRFLAGS.

DLIBDIRPREFIX

DLIBDIRPREFIX.

DLIBDIRSUFFIX

DLIBDIRSUFFIX.

DLIBFLAGPREFIX

DLIBFLAGPREFIX.

_DLIBFLAGS

_DLIBFLAGS.

DLIBFLAGSUFFIX

DLIBFLAGSUFFIX.

DLIBLINKPREFIX

DLIBLINKPREFIX.

DLIBLINKSUFFIX

DLIBLINKSUFFIX.

DLINK

DLINK.

DLINKCOM

DLINKCOM.

DLINKFLAGPREFIX

DLINKFLAGPREFIX.

DLINKFLAGS

DLINKFLAGS.

DLINKFLAGSUFFIX

DLINKFLAGSUFFIX.

DOCBOOK_DEFAULT_XSL_EPUB

The default XSLT file for the DocbookEpub builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_HTML

The default XSLT file for the DocbookHtml builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_HTMLCHUNKED

The default XSLT file for the DocbookHtmlChunked builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_HTMLHELP

The default XSLT file for the DocbookHtmlhelp builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_MAN

The default XSLT file for the DocbookMan builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_PDF

The default XSLT file for the DocbookPdf builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_SLIDESHTML

The default XSLT file for the DocbookSlidesHtml builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_SLIDESPDF

The default XSLT file for the DocbookSlidesPdf builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_FOP

The path to the PDF renderer fop or xep, if one of them is installed (fop gets checked first).

DOCBOOK_FOPCOM

The full command-line for the PDF renderer fop or xep.

DOCBOOK_FOPCOMSTR

The string displayed when a renderer like fop or xep is used to create PDF output from an XML file.

DOCBOOK_FOPFLAGS

Additonal command-line flags for the PDF renderer fop or xep.

DOCBOOK_XMLLINT

The path to the external executable xmllint, if it's installed. Note, that this is only used as last fallback for resolving XIncludes, if no libxml2 or lxml Python binding can be imported in the current system.

DOCBOOK_XMLLINTCOM

The full command-line for the external executable xmllint.

DOCBOOK_XMLLINTCOMSTR

The string displayed when xmllint is used to resolve XIncludes for a given XML file.

DOCBOOK_XMLLINTFLAGS

Additonal command-line flags for the external executable xmllint.

DOCBOOK_XSLTPROC

The path to the external executable xsltproc (or saxon, xalan), if one of them is installed. Note, that this is only used as last fallback for XSL transformations, if no libxml2 or lxml Python binding can be imported in the current system.

DOCBOOK_XSLTPROCCOM

The full command-line for the external executable xsltproc (or saxon, xalan).

DOCBOOK_XSLTPROCCOMSTR

The string displayed when xsltproc is used to transform an XML file via a given XSLT stylesheet.

DOCBOOK_XSLTPROCFLAGS

Additonal command-line flags for the external executable xsltproc (or saxon, xalan).

DOCBOOK_XSLTPROCPARAMS

Additonal parameters that are not intended for the XSLT processor executable, but the XSL processing itself. By default, they get appended at the end of the command line for saxon and saxon-xslt, respectively.

DPATH

DPATH.

DSUFFIXES

The list of suffixes of files that will be scanned for imported D package files. The default list is:

['.d']

_DVERFLAGS

_DVERFLAGS.

DVERPREFIX

DVERPREFIX.

DVERSIONS

DVERSIONS.

DVERSUFFIX

DVERSUFFIX.

DVIPDF

The TeX DVI file to PDF file converter.

DVIPDFCOM

The command line used to convert TeX DVI files into a PDF file.

DVIPDFCOMSTR

The string displayed when a TeX DVI file is converted into a PDF file. If this is not set, then $DVIPDFCOM (the command line) is displayed.

DVIPDFFLAGS

General options passed to the TeX DVI file to PDF file converter.

DVIPS

The TeX DVI file to PostScript converter.

DVIPSFLAGS

General options passed to the TeX DVI file to PostScript converter.

ENV

A dictionary of environment variables to use when invoking commands. When $ENV is used in a command all list values will be joined using the path separator and any other non-string values will simply be coerced to a string. Note that, by default, scons does not propagate the environment in force when you execute scons to the commands used to build target files. This is so that builds will be guaranteed repeatable regardless of the environment variables set at the time scons is invoked.

If you want to propagate your environment variables to the commands executed to build target files, you must do so explicitly:

import os
env = Environment(ENV = os.environ)

Note that you can choose only to propagate certain environment variables. A common example is the system PATH environment variable, so that scons uses the same utilities as the invoking shell (or other process):

import os
env = Environment(ENV = {'PATH' : os.environ['PATH']})

ESCAPE

A function that will be called to escape shell special characters in command lines. The function should take one argument: the command line string to escape; and should return the escaped command line.

F03

The Fortran 03 compiler. You should normally set the $FORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $F03 if you need to use a specific compiler or compiler version for Fortran 03 files.

F03COM

The command line used to compile a Fortran 03 source file to an object file. You only need to set $F03COM if you need to use a specific command line for Fortran 03 files. You should normally set the $FORTRANCOM variable, which specifies the default command line for all Fortran versions.

F03COMSTR

The string displayed when a Fortran 03 source file is compiled to an object file. If this is not set, then $F03COM or $FORTRANCOM (the command line) is displayed.

F03FILESUFFIXES

The list of file extensions for which the F03 dialect will be used. By default, this is ['.f03']

F03FLAGS

General user-specified options that are passed to the Fortran 03 compiler. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $F03PATH. See $_F03INCFLAGS below, for the variable that expands to those options. You only need to set $F03FLAGS if you need to define specific user options for Fortran 03 files. You should normally set the $FORTRANFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

_F03INCFLAGS

An automatically-generated construction variable containing the Fortran 03 compiler command-line options for specifying directories to be searched for include files. The value of $_F03INCFLAGS is created by appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $F03PATH.

F03PATH

The list of directories that the Fortran 03 compiler will search for include directories. The implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in $F03FLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in $F03PATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #: You only need to set $F03PATH if you need to define a specific include path for Fortran 03 files. You should normally set the $FORTRANPATH variable, which specifies the include path for the default Fortran compiler for all Fortran versions.

env = Environment(F03PATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(F03PATH=include)

The directory list will be added to command lines through the automatically-generated $_F03INCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $F03PATH. Any command lines you define that need the F03PATH directory list should include $_F03INCFLAGS:

env = Environment(F03COM="my_compiler $_F03INCFLAGS -c -o $TARGET $SOURCE")

F03PPCOM

The command line used to compile a Fortran 03 source file to an object file after first running the file through the C preprocessor. Any options specified in the $F03FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $F03PPCOM if you need to use a specific C-preprocessor command line for Fortran 03 files. You should normally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

F03PPCOMSTR

The string displayed when a Fortran 03 source file is compiled to an object file after first running the file through the C preprocessor. If this is not set, then $F03PPCOM or $FORTRANPPCOM (the command line) is displayed.

F03PPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for F03 dialect will be used. By default, this is empty

F08

The Fortran 08 compiler. You should normally set the $FORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $F08 if you need to use a specific compiler or compiler version for Fortran 08 files.

F08COM

The command line used to compile a Fortran 08 source file to an object file. You only need to set $F08COM if you need to use a specific command line for Fortran 08 files. You should normally set the $FORTRANCOM variable, which specifies the default command line for all Fortran versions.

F08COMSTR

The string displayed when a Fortran 08 source file is compiled to an object file. If this is not set, then $F08COM or $FORTRANCOM (the command line) is displayed.

F08FILESUFFIXES

The list of file extensions for which the F08 dialect will be used. By default, this is ['.f08']

F08FLAGS

General user-specified options that are passed to the Fortran 08 compiler. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $F08PATH. See $_F08INCFLAGS below, for the variable that expands to those options. You only need to set $F08FLAGS if you need to define specific user options for Fortran 08 files. You should normally set the $FORTRANFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

_F08INCFLAGS

An automatically-generated construction variable containing the Fortran 08 compiler command-line options for specifying directories to be searched for include files. The value of $_F08INCFLAGS is created by appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $F08PATH.

F08PATH

The list of directories that the Fortran 08 compiler will search for include directories. The implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in $F08FLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in $F08PATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #: You only need to set $F08PATH if you need to define a specific include path for Fortran 08 files. You should normally set the $FORTRANPATH variable, which specifies the include path for the default Fortran compiler for all Fortran versions.

env = Environment(F08PATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(F08PATH=include)

The directory list will be added to command lines through the automatically-generated $_F08INCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $F08PATH. Any command lines you define that need the F08PATH directory list should include $_F08INCFLAGS:

env = Environment(F08COM="my_compiler $_F08INCFLAGS -c -o $TARGET $SOURCE")

F08PPCOM

The command line used to compile a Fortran 08 source file to an object file after first running the file through the C preprocessor. Any options specified in the $F08FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $F08PPCOM if you need to use a specific C-preprocessor command line for Fortran 08 files. You should normally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

F08PPCOMSTR

The string displayed when a Fortran 08 source file is compiled to an object file after first running the file through the C preprocessor. If this is not set, then $F08PPCOM or $FORTRANPPCOM (the command line) is displayed.

F08PPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for F08 dialect will be used. By default, this is empty

F77

The Fortran 77 compiler. You should normally set the $FORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $F77 if you need to use a specific compiler or compiler version for Fortran 77 files.

F77COM

The command line used to compile a Fortran 77 source file to an object file. You only need to set $F77COM if you need to use a specific command line for Fortran 77 files. You should normally set the $FORTRANCOM variable, which specifies the default command line for all Fortran versions.

F77COMSTR

The string displayed when a Fortran 77 source file is compiled to an object file. If this is not set, then $F77COM or $FORTRANCOM (the command line) is displayed.

F77FILESUFFIXES

The list of file extensions for which the F77 dialect will be used. By default, this is ['.f77']

F77FLAGS

General user-specified options that are passed to the Fortran 77 compiler. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $F77PATH. See $_F77INCFLAGS below, for the variable that expands to those options. You only need to set $F77FLAGS if you need to define specific user options for Fortran 77 files. You should normally set the $FORTRANFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

_F77INCFLAGS

An automatically-generated construction variable containing the Fortran 77 compiler command-line options for specifying directories to be searched for include files. The value of $_F77INCFLAGS is created by appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $F77PATH.

F77PATH

The list of directories that the Fortran 77 compiler will search for include directories. The implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in $F77FLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in $F77PATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #: You only need to set $F77PATH if you need to define a specific include path for Fortran 77 files. You should normally set the $FORTRANPATH variable, which specifies the include path for the default Fortran compiler for all Fortran versions.

env = Environment(F77PATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(F77PATH=include)

The directory list will be added to command lines through the automatically-generated $_F77INCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $F77PATH. Any command lines you define that need the F77PATH directory list should include $_F77INCFLAGS:

env = Environment(F77COM="my_compiler $_F77INCFLAGS -c -o $TARGET $SOURCE")

F77PPCOM

The command line used to compile a Fortran 77 source file to an object file after first running the file through the C preprocessor. Any options specified in the $F77FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $F77PPCOM if you need to use a specific C-preprocessor command line for Fortran 77 files. You should normally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

F77PPCOMSTR

The string displayed when a Fortran 77 source file is compiled to an object file after first running the file through the C preprocessor. If this is not set, then $F77PPCOM or $FORTRANPPCOM (the command line) is displayed.

F77PPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for F77 dialect will be used. By default, this is empty

F90

The Fortran 90 compiler. You should normally set the $FORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $F90 if you need to use a specific compiler or compiler version for Fortran 90 files.

F90COM

The command line used to compile a Fortran 90 source file to an object file. You only need to set $F90COM if you need to use a specific command line for Fortran 90 files. You should normally set the $FORTRANCOM variable, which specifies the default command line for all Fortran versions.

F90COMSTR

The string displayed when a Fortran 90 source file is compiled to an object file. If this is not set, then $F90COM or $FORTRANCOM (the command line) is displayed.

F90FILESUFFIXES

The list of file extensions for which the F90 dialect will be used. By default, this is ['.f90']

F90FLAGS

General user-specified options that are passed to the Fortran 90 compiler. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $F90PATH. See $_F90INCFLAGS below, for the variable that expands to those options. You only need to set $F90FLAGS if you need to define specific user options for Fortran 90 files. You should normally set the $FORTRANFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

_F90INCFLAGS

An automatically-generated construction variable containing the Fortran 90 compiler command-line options for specifying directories to be searched for include files. The value of $_F90INCFLAGS is created by appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $F90PATH.

F90PATH

The list of directories that the Fortran 90 compiler will search for include directories. The implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in $F90FLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in $F90PATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #: You only need to set $F90PATH if you need to define a specific include path for Fortran 90 files. You should normally set the $FORTRANPATH variable, which specifies the include path for the default Fortran compiler for all Fortran versions.

env = Environment(F90PATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(F90PATH=include)

The directory list will be added to command lines through the automatically-generated $_F90INCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $F90PATH. Any command lines you define that need the F90PATH directory list should include $_F90INCFLAGS:

env = Environment(F90COM="my_compiler $_F90INCFLAGS -c -o $TARGET $SOURCE")

F90PPCOM

The command line used to compile a Fortran 90 source file to an object file after first running the file through the C preprocessor. Any options specified in the $F90FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $F90PPCOM if you need to use a specific C-preprocessor command line for Fortran 90 files. You should normally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

F90PPCOMSTR

The string displayed when a Fortran 90 source file is compiled after first running the file through the C preprocessor. If this is not set, then $F90PPCOM or $FORTRANPPCOM (the command line) is displayed.

F90PPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for F90 dialect will be used. By default, this is empty

F95

The Fortran 95 compiler. You should normally set the $FORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $F95 if you need to use a specific compiler or compiler version for Fortran 95 files.

F95COM

The command line used to compile a Fortran 95 source file to an object file. You only need to set $F95COM if you need to use a specific command line for Fortran 95 files. You should normally set the $FORTRANCOM variable, which specifies the default command line for all Fortran versions.

F95COMSTR

The string displayed when a Fortran 95 source file is compiled to an object file. If this is not set, then $F95COM or $FORTRANCOM (the command line) is displayed.

F95FILESUFFIXES

The list of file extensions for which the F95 dialect will be used. By default, this is ['.f95']

F95FLAGS

General user-specified options that are passed to the Fortran 95 compiler. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $F95PATH. See $_F95INCFLAGS below, for the variable that expands to those options. You only need to set $F95FLAGS if you need to define specific user options for Fortran 95 files. You should normally set the $FORTRANFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

_F95INCFLAGS

An automatically-generated construction variable containing the Fortran 95 compiler command-line options for specifying directories to be searched for include files. The value of $_F95INCFLAGS is created by appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $F95PATH.

F95PATH

The list of directories that the Fortran 95 compiler will search for include directories. The implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in $F95FLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in $F95PATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #: You only need to set $F95PATH if you need to define a specific include path for Fortran 95 files. You should normally set the $FORTRANPATH variable, which specifies the include path for the default Fortran compiler for all Fortran versions.

env = Environment(F95PATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(F95PATH=include)

The directory list will be added to command lines through the automatically-generated $_F95INCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $F95PATH. Any command lines you define that need the F95PATH directory list should include $_F95INCFLAGS:

env = Environment(F95COM="my_compiler $_F95INCFLAGS -c -o $TARGET $SOURCE")

F95PPCOM

The command line used to compile a Fortran 95 source file to an object file after first running the file through the C preprocessor. Any options specified in the $F95FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $F95PPCOM if you need to use a specific C-preprocessor command line for Fortran 95 files. You should normally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

F95PPCOMSTR

The string displayed when a Fortran 95 source file is compiled to an object file after first running the file through the C preprocessor. If this is not set, then $F95PPCOM or $FORTRANPPCOM (the command line) is displayed.

F95PPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for F95 dialect will be used. By default, this is empty

File

A function that converts a string into a File instance relative to the target being built.

A function that converts a string into a File instance relative to the target being built.

FORTRAN

The default Fortran compiler for all versions of Fortran.

FORTRANCOM

The command line used to compile a Fortran source file to an object file. By default, any options specified in the $FORTRANFLAGS, $CPPFLAGS, $_CPPDEFFLAGS, $_FORTRANMODFLAG, and $_FORTRANINCFLAGS construction variables are included on this command line.

FORTRANCOMSTR

The string displayed when a Fortran source file is compiled to an object file. If this is not set, then $FORTRANCOM (the command line) is displayed.

FORTRANFILESUFFIXES

The list of file extensions for which the FORTRAN dialect will be used. By default, this is ['.f', '.for', '.ftn']

FORTRANFLAGS

General user-specified options that are passed to the Fortran compiler. Note that this variable does not contain -I (or similar) include or module search path options that scons generates automatically from $FORTRANPATH. See $_FORTRANINCFLAGS and $_FORTRANMODFLAG, below, for the variables that expand those options.

_FORTRANINCFLAGS

An automatically-generated construction variable containing the Fortran compiler command-line options for specifying directories to be searched for include files and module files. The value of $_FORTRANINCFLAGS is created by prepending/appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $FORTRANPATH.

FORTRANMODDIR

Directory location where the Fortran compiler should place any module files it generates. This variable is empty, by default. Some Fortran compilers will internally append this directory in the search path for module files, as well.

FORTRANMODDIRPREFIX

The prefix used to specify a module directory on the Fortran compiler command line. This will be appended to the beginning of the directory in the $FORTRANMODDIR construction variables when the $_FORTRANMODFLAG variables is automatically generated.

FORTRANMODDIRSUFFIX

The suffix used to specify a module directory on the Fortran compiler command line. This will be appended to the beginning of the directory in the $FORTRANMODDIR construction variables when the $_FORTRANMODFLAG variables is automatically generated.

_FORTRANMODFLAG

An automatically-generated construction variable containing the Fortran compiler command-line option for specifying the directory location where the Fortran compiler should place any module files that happen to get generated during compilation. The value of $_FORTRANMODFLAG is created by prepending/appending $FORTRANMODDIRPREFIX and $FORTRANMODDIRSUFFIX to the beginning and end of the directory in $FORTRANMODDIR.

FORTRANMODPREFIX

The module file prefix used by the Fortran compiler. SCons assumes that the Fortran compiler follows the quasi-standard naming convention for module files of module_name.mod. As a result, this variable is left empty, by default. For situations in which the compiler does not necessarily follow the normal convention, the user may use this variable. Its value will be appended to every module file name as scons attempts to resolve dependencies.

FORTRANMODSUFFIX

The module file suffix used by the Fortran compiler. SCons assumes that the Fortran compiler follows the quasi-standard naming convention for module files of module_name.mod. As a result, this variable is set to ".mod", by default. For situations in which the compiler does not necessarily follow the normal convention, the user may use this variable. Its value will be appended to every module file name as scons attempts to resolve dependencies.

FORTRANPATH

The list of directories that the Fortran compiler will search for include files and (for some compilers) module files. The Fortran implicit dependency scanner will search these directories for include files (but not module files since they are autogenerated and, as such, may not actually exist at the time the scan takes place). Don't explicitly put include directory arguments in FORTRANFLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in FORTRANPATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #:

env = Environment(FORTRANPATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(FORTRANPATH=include)

The directory list will be added to command lines through the automatically-generated $_FORTRANINCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $FORTRANPATH. Any command lines you define that need the FORTRANPATH directory list should include $_FORTRANINCFLAGS:

env = Environment(FORTRANCOM="my_compiler $_FORTRANINCFLAGS -c -o $TARGET $SOURCE")

FORTRANPPCOM

The command line used to compile a Fortran source file to an object file after first running the file through the C preprocessor. By default, any options specified in the $FORTRANFLAGS, $CPPFLAGS, $_CPPDEFFLAGS, $_FORTRANMODFLAG, and $_FORTRANINCFLAGS construction variables are included on this command line.

FORTRANPPCOMSTR

The string displayed when a Fortran source file is compiled to an object file after first running the file through the C preprocessor. If this is not set, then $FORTRANPPCOM (the command line) is displayed.

FORTRANPPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for FORTRAN dialect will be used. By default, this is ['.fpp', '.FPP']

FORTRANSUFFIXES

The list of suffixes of files that will be scanned for Fortran implicit dependencies (INCLUDE lines and USE statements). The default list is:

[".f", ".F", ".for", ".FOR", ".ftn", ".FTN", ".fpp", ".FPP",
".f77", ".F77", ".f90", ".F90", ".f95", ".F95"]

FRAMEWORKPATH

On Mac OS X with gcc, a list containing the paths to search for frameworks. Used by the compiler to find framework-style includes like #include <Fmwk/Header.h>. Used by the linker to find user-specified frameworks when linking (see $FRAMEWORKS). For example:

 env.AppendUnique(FRAMEWORKPATH='#myframeworkdir')

will add

  ... -Fmyframeworkdir

to the compiler and linker command lines.

_FRAMEWORKPATH

On Mac OS X with gcc, an automatically-generated construction variable containing the linker command-line options corresponding to $FRAMEWORKPATH.

FRAMEWORKPATHPREFIX

On Mac OS X with gcc, the prefix to be used for the FRAMEWORKPATH entries. (see $FRAMEWORKPATH). The default value is -F.

FRAMEWORKPREFIX

On Mac OS X with gcc, the prefix to be used for linking in frameworks (see $FRAMEWORKS). The default value is -framework.

_FRAMEWORKS

On Mac OS X with gcc, an automatically-generated construction variable containing the linker command-line options for linking with FRAMEWORKS.

FRAMEWORKS

On Mac OS X with gcc, a list of the framework names to be linked into a program or shared library or bundle. The default value is the empty list. For example:

 env.AppendUnique(FRAMEWORKS=Split('System Cocoa SystemConfiguration'))

FRAMEWORKSFLAGS

On Mac OS X with gcc, general user-supplied frameworks options to be added at the end of a command line building a loadable module. (This has been largely superseded by the $FRAMEWORKPATH, $FRAMEWORKPATHPREFIX, $FRAMEWORKPREFIX and $FRAMEWORKS variables described above.)

GS

The Ghostscript program used, e.g. to convert PostScript to PDF files.

GSCOM

The full Ghostscript command line used for the conversion process. Its default value is lq$GS $GSFLAGS -sOutputFile=$TARGET $SOURCESrq.

GSCOMSTR

The string displayed when Ghostscript is called for the conversion process. If this is not set (the default), then $GSCOM (the command line) is displayed.

GSFLAGS

General options passed to the Ghostscript program, when converting PostScript to PDF files for example. Its default value is lq-dNOPAUSE -dBATCH -sDEVICE=pdfwriterq

HOST_ARCH

Sets the host architecture for Visual Studio compiler. If not set, default to the detected host architecture: note that this may depend on the python you are using. This variable must be passed as an argument to the Environment() constructor; setting it later has no effect.

Valid values are the same as for $TARGET_ARCH.

This is currently only used on Windows, but in the future it will be used on other OSes as well.

The name of the host hardware architecture used to create the Environment. If a platform is specified when creating the Environment, then that Platform's logic will handle setting this value. This value is immutable, and should not be changed by the user after the Environment is initialized. Currently only set for Win32.

HOST_OS

The name of the host operating system used to create the Environment. If a platform is specified when creating the Environment, then that Platform's logic will handle setting this value. This value is immutable, and should not be changed by the user after the Environment is initialized. Currently only set for Win32.

IDLSUFFIXES

The list of suffixes of files that will be scanned for IDL implicit dependencies (#include or import lines). The default list is:

[".idl", ".IDL"]

IMPLIBNOVERSIONSYMLINKS

Used to override $SHLIBNOVERSIONSYMLINKS/$LDMODULENOVERSIONSYMLINKS when creating versioned import library for a shared library/loadable module. If not defined, then $SHLIBNOVERSIONSYMLINKS/$LDMODULENOVERSIONSYMLINKS is used to determine whether to disable symlink generation or not.

IMPLIBPREFIX

The prefix used for import library names. For example, cygwin uses import libraries (libfoo.dll.a) in pair with dynamic libraries (cygfoo.dll). The cyglink linker sets $IMPLIBPREFIX to 'lib' and $SHLIBPREFIX to 'cyg'.

IMPLIBSUFFIX

The suffix used for import library names. For example, cygwin uses import libraries (libfoo.dll.a) in pair with dynamic libraries (cygfoo.dll). The cyglink linker sets $IMPLIBSUFFIX to '.dll.a' and $SHLIBSUFFIX to '.dll'.

IMPLIBVERSION

Used to override $SHLIBVERSION/$LDMODULEVERSION when generating versioned import library for a shared library/loadable module. If undefined, the $SHLIBVERSION/$LDMODULEVERSION is used to determine the version of versioned import library.

IMPLICIT_COMMAND_DEPENDENCIES

Controls whether or not SCons will add implicit dependencies for the commands executed to build targets.

By default, SCons will add to each target an implicit dependency on the command represented by the first argument on any command line it executes. The specific file for the dependency is found by searching the PATH variable in the ENV environment used to execute the command.

If the construction variable $IMPLICIT_COMMAND_DEPENDENCIES is set to a false value (None, False, 0, etc.), then the implicit dependency will not be added to the targets built with that construction environment.

env = Environment(IMPLICIT_COMMAND_DEPENDENCIES = 0)

INCPREFIX

The prefix used to specify an include directory on the C compiler command line. This will be appended to the beginning of each directory in the $CPPPATH and $FORTRANPATH construction variables when the $_CPPINCFLAGS and $_FORTRANINCFLAGS variables are automatically generated.

INCSUFFIX

The suffix used to specify an include directory on the C compiler command line. This will be appended to the end of each directory in the $CPPPATH and $FORTRANPATH construction variables when the $_CPPINCFLAGS and $_FORTRANINCFLAGS variables are automatically generated.

INSTALL

A function to be called to install a file into a destination file name. The default function copies the file into the destination (and sets the destination file's mode and permission bits to match the source file's). The function takes the following arguments:

def install(dest, source, env):

dest is the path name of the destination file. source is the path name of the source file. env is the construction environment (a dictionary of construction values) in force for this file installation.

INSTALLSTR

The string displayed when a file is installed into a destination file name. The default is:

Install file: "$SOURCE" as "$TARGET"

INTEL_C_COMPILER_VERSION

Set by the "intelc" Tool to the major version number of the Intel C compiler selected for use.

JAR

The Java archive tool.

The Java archive tool.

JARCHDIR

The directory to which the Java archive tool should change (using the -C option).

The directory to which the Java archive tool should change (using the -C option).

JARCOM

The command line used to call the Java archive tool.

The command line used to call the Java archive tool.

JARCOMSTR

The string displayed when the Java archive tool is called If this is not set, then $JARCOM (the command line) is displayed.

env = Environment(JARCOMSTR = "JARchiving $SOURCES into $TARGET")

The string displayed when the Java archive tool is called If this is not set, then $JARCOM (the command line) is displayed.

env = Environment(JARCOMSTR = "JARchiving $SOURCES into $TARGET")

JARFLAGS

General options passed to the Java archive tool. By default this is set to cf to create the necessary jar file.

General options passed to the Java archive tool. By default this is set to cf to create the necessary jar file.

JARSUFFIX

The suffix for Java archives: .jar by default.

The suffix for Java archives: .jar by default.

JAVABOOTCLASSPATH

Specifies the list of directories that will be added to the javac command line via the -bootclasspath option. The individual directory names will be separated by the operating system's path separate character (: on UNIX/Linux/POSIX, ; on Windows).

JAVAC

The Java compiler.

JAVACCOM

The command line used to compile a directory tree containing Java source files to corresponding Java class files. Any options specified in the $JAVACFLAGS construction variable are included on this command line.

JAVACCOMSTR

The string displayed when compiling a directory tree of Java source files to corresponding Java class files. If this is not set, then $JAVACCOM (the command line) is displayed.

env = Environment(JAVACCOMSTR = "Compiling class files $TARGETS from $SOURCES")

JAVACFLAGS

General options that are passed to the Java compiler.

JAVACLASSDIR

The directory in which Java class files may be found. This is stripped from the beginning of any Java .class file names supplied to the JavaH builder.

JAVACLASSPATH

Specifies the list of directories that will be searched for Java .class file. The directories in this list will be added to the javac and javah command lines via the -classpath option. The individual directory names will be separated by the operating system's path separate character (: on UNIX/Linux/POSIX, ; on Windows).

Note that this currently just adds the specified directory via the -classpath option. SCons does not currently search the $JAVACLASSPATH directories for dependency .class files.

JAVACLASSSUFFIX

The suffix for Java class files; .class by default.

JAVAH

The Java generator for C header and stub files.

JAVAHCOM

The command line used to generate C header and stub files from Java classes. Any options specified in the $JAVAHFLAGS construction variable are included on this command line.

JAVAHCOMSTR

The string displayed when C header and stub files are generated from Java classes. If this is not set, then $JAVAHCOM (the command line) is displayed.

env = Environment(JAVAHCOMSTR = "Generating header/stub file(s) $TARGETS from $SOURCES")

JAVAHFLAGS

General options passed to the C header and stub file generator for Java classes.

JAVASOURCEPATH

Specifies the list of directories that will be searched for input .java file. The directories in this list will be added to the javac command line via the -sourcepath option. The individual directory names will be separated by the operating system's path separate character (: on UNIX/Linux/POSIX, ; on Windows).

Note that this currently just adds the specified directory via the -sourcepath option. SCons does not currently search the $JAVASOURCEPATH directories for dependency .java files.

JAVASUFFIX

The suffix for Java files; .java by default.

JAVAVERSION

Specifies the Java version being used by the Java builder. This is not currently used to select one version of the Java compiler vs. another. Instead, you should set this to specify the version of Java supported by your javac compiler. The default is 1.4.

This is sometimes necessary because Java 1.5 changed the file names that are created for nested anonymous inner classes, which can cause a mismatch with the files that SCons expects will be generated by the javac compiler. Setting $JAVAVERSION to 1.5 (or 1.6, as appropriate) can make SCons realize that a Java 1.5 or 1.6 build is actually up to date.

LATEX

The LaTeX structured formatter and typesetter.

LATEXCOM

The command line used to call the LaTeX structured formatter and typesetter.

LATEXCOMSTR

The string displayed when calling the LaTeX structured formatter and typesetter. If this is not set, then $LATEXCOM (the command line) is displayed.

env = Environment(LATEXCOMSTR = "Building $TARGET from LaTeX input $SOURCES")

LATEXFLAGS

General options passed to the LaTeX structured formatter and typesetter.

LATEXRETRIES

The maximum number of times that LaTeX will be re-run if the .log generated by the $LATEXCOM command indicates that there are undefined references. The default is to try to resolve undefined references by re-running LaTeX up to three times.

LATEXSUFFIXES

The list of suffixes of files that will be scanned for LaTeX implicit dependencies (\include or \import files). The default list is:

[".tex", ".ltx", ".latex"]

LDMODULE

The linker for building loadable modules. By default, this is the same as $SHLINK.

LDMODULECOM

The command line for building loadable modules. On Mac OS X, this uses the $LDMODULE, $LDMODULEFLAGS and $FRAMEWORKSFLAGS variables. On other systems, this is the same as $SHLINK.

LDMODULECOMSTR

The string displayed when building loadable modules. If this is not set, then $LDMODULECOM (the command line) is displayed.

LDMODULEFLAGS

General user options passed to the linker for building loadable modules.

LDMODULENOVERSIONSYMLINKS

Instructs the LoadableModule builder to not automatically create symlinks for versioned modules. Defaults to $SHLIBNOVERSIONSYMLINKS

LDMODULEPREFIX

The prefix used for loadable module file names. On Mac OS X, this is null; on other systems, this is the same as $SHLIBPREFIX.

_LDMODULESONAME

A macro that automatically generates loadable module's SONAME based on $TARGET, $LDMODULEVERSION and $LDMODULESUFFIX. Used by LoadableModule builder when the linker tool supports SONAME (e.g. gnulink).

LDMODULESUFFIX

The suffix used for loadable module file names. On Mac OS X, this is null; on other systems, this is the same as $SHLIBSUFFIX.

LDMODULEVERSION

When this construction variable is defined, a versioned loadable module is created by LoadableModule builder. This activates the $_LDMODULEVERSIONFLAGS and thus modifies the $LDMODULECOM as required, adds the version number to the library name, and creates the symlinks that are needed. $LDMODULEVERSION versions should exist in the same format as $SHLIBVERSION.

LDMODULEVERSIONFLAGS

Extra flags added to $LDMODULECOM when building versioned LoadableModule. These flags are only used when $LDMODULEVERSION is set.

_LDMODULEVERSIONFLAGS

This macro automatically introduces extra flags to $LDMODULECOM when building versioned LoadableModule (that is when $LDMODULEVERSION is set). _LDMODULEVERSIONFLAGS usually adds $SHLIBVERSIONFLAGS and some extra dynamically generated options (such as -Wl,-soname=$_LDMODULESONAME). It is unused by plain (unversioned) loadable modules.

LEX

The lexical analyzer generator.

LEXCOM

The command line used to call the lexical analyzer generator to generate a source file.

LEXCOMSTR

The string displayed when generating a source file using the lexical analyzer generator. If this is not set, then $LEXCOM (the command line) is displayed.

env = Environment(LEXCOMSTR = "Lex'ing $TARGET from $SOURCES")

LEXFLAGS

General options passed to the lexical analyzer generator.

_LIBDIRFLAGS

An automatically-generated construction variable containing the linker command-line options for specifying directories to be searched for library. The value of $_LIBDIRFLAGS is created by appending $LIBDIRPREFIX and $LIBDIRSUFFIX to the beginning and end of each directory in $LIBPATH.

LIBDIRPREFIX

The prefix used to specify a library directory on the linker command line. This will be appended to the beginning of each directory in the $LIBPATH construction variable when the $_LIBDIRFLAGS variable is automatically generated.

LIBDIRSUFFIX

The suffix used to specify a library directory on the linker command line. This will be appended to the end of each directory in the $LIBPATH construction variable when the $_LIBDIRFLAGS variable is automatically generated.

LIBEMITTER

TODO

_LIBFLAGS

An automatically-generated construction variable containing the linker command-line options for specifying libraries to be linked with the resulting target. The value of $_LIBFLAGS is created by appending $LIBLINKPREFIX and $LIBLINKSUFFIX to the beginning and end of each filename in $LIBS.

LIBLINKPREFIX

The prefix used to specify a library to link on the linker command line. This will be appended to the beginning of each library in the $LIBS construction variable when the $_LIBFLAGS variable is automatically generated.

LIBLINKSUFFIX

The suffix used to specify a library to link on the linker command line. This will be appended to the end of each library in the $LIBS construction variable when the $_LIBFLAGS variable is automatically generated.

LIBPATH

The list of directories that will be searched for libraries. The implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in $LINKFLAGS or $SHLINKFLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in LIBPATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #:

env = Environment(LIBPATH='#/libs')

The directory look-up can also be forced using the Dir() function:

libs = Dir('libs')
env = Environment(LIBPATH=libs)

The directory list will be added to command lines through the automatically-generated $_LIBDIRFLAGS construction variable, which is constructed by appending the values of the $LIBDIRPREFIX and $LIBDIRSUFFIX construction variables to the beginning and end of each directory in $LIBPATH. Any command lines you define that need the LIBPATH directory list should include $_LIBDIRFLAGS:

env = Environment(LINKCOM="my_linker $_LIBDIRFLAGS $_LIBFLAGS -o $TARGET $SOURCE")

LIBPREFIX

The prefix used for (static) library file names. A default value is set for each platform (posix, win32, os2, etc.), but the value is overridden by individual tools (ar, mslib, sgiar, sunar, tlib, etc.) to reflect the names of the libraries they create.

LIBPREFIXES

A list of all legal prefixes for library file names. When searching for library dependencies, SCons will look for files with these prefixes, the base library name, and suffixes in the $LIBSUFFIXES list.

LIBS

A list of one or more libraries that will be linked with any executable programs created by this environment.

The library list will be added to command lines through the automatically-generated $_LIBFLAGS construction variable, which is constructed by appending the values of the $LIBLINKPREFIX and $LIBLINKSUFFIX construction variables to the beginning and end of each filename in $LIBS. Any command lines you define that need the LIBS library list should include $_LIBFLAGS:

env = Environment(LINKCOM="my_linker $_LIBDIRFLAGS $_LIBFLAGS -o $TARGET $SOURCE")

If you add a File object to the $LIBS list, the name of that file will be added to $_LIBFLAGS, and thus the link line, as is, without $LIBLINKPREFIX or $LIBLINKSUFFIX. For example:

env.Append(LIBS=File('/tmp/mylib.so'))

In all cases, scons will add dependencies from the executable program to all the libraries in this list.

LIBSUFFIX

The suffix used for (static) library file names. A default value is set for each platform (posix, win32, os2, etc.), but the value is overridden by individual tools (ar, mslib, sgiar, sunar, tlib, etc.) to reflect the names of the libraries they create.

LIBSUFFIXES

A list of all legal suffixes for library file names. When searching for library dependencies, SCons will look for files with prefixes, in the $LIBPREFIXES list, the base library name, and these suffixes.

LICENSE

The abbreviated name of the license under which this project is released (gpl, lpgl, bsd etc.). See http://www.opensource.org/licenses/alphabetical for a list of license names.

LINESEPARATOR

The separator used by the Substfile and Textfile builders. This value is used between sources when constructing the target. It defaults to the current system line separator.

LINGUAS_FILE

The $LINGUAS_FILE defines file(s) containing list of additional linguas to be processed by POInit, POUpdate or MOFiles builders. It also affects Translate builder. If the variable contains a string, it defines name of the list file. The $LINGUAS_FILE may be a list of file names as well. If $LINGUAS_FILE is set to True (or non-zero numeric value), the list will be read from default file named LINGUAS.

LINK

The linker.

LINKCOM

The command line used to link object files into an executable.

LINKCOMSTR

The string displayed when object files are linked into an executable. If this is not set, then $LINKCOM (the command line) is displayed.

env = Environment(LINKCOMSTR = "Linking $TARGET")

LINKFLAGS

General user options passed to the linker. Note that this variable should not contain -l (or similar) options for linking with the libraries listed in $LIBS, nor -L (or similar) library search path options that scons generates automatically from $LIBPATH. See $_LIBFLAGS above, for the variable that expands to library-link options, and $_LIBDIRFLAGS above, for the variable that expands to library search path options.

M4

The M4 macro preprocessor.

M4COM

The command line used to pass files through the M4 macro preprocessor.

M4COMSTR

The string displayed when a file is passed through the M4 macro preprocessor. If this is not set, then $M4COM (the command line) is displayed.

M4FLAGS

General options passed to the M4 macro preprocessor.

MAKEINDEX

The makeindex generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

MAKEINDEXCOM

The command line used to call the makeindex generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

MAKEINDEXCOMSTR

The string displayed when calling the makeindex generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter. If this is not set, then $MAKEINDEXCOM (the command line) is displayed.

MAKEINDEXFLAGS

General options passed to the makeindex generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

MAXLINELENGTH

The maximum number of characters allowed on an external command line. On Win32 systems, link lines longer than this many characters are linked via a temporary file name.

MIDL

The Microsoft IDL compiler.

MIDLCOM

The command line used to pass files to the Microsoft IDL compiler.

MIDLCOMSTR

The string displayed when the Microsoft IDL copmiler is called. If this is not set, then $MIDLCOM (the command line) is displayed.

MIDLFLAGS

General options passed to the Microsoft IDL compiler.

MOSUFFIX

Suffix used for MO files (default: '.mo'). See msgfmt tool and MOFiles builder.

MSGFMT

Absolute path to msgfmt(1) binary, found by Detect(). See msgfmt tool and MOFiles builder.

MSGFMTCOM

Complete command line to run msgfmt(1) program. See msgfmt tool and MOFiles builder.

MSGFMTCOMSTR

String to display when msgfmt(1) is invoked (default: '', which means ``print $MSGFMTCOM''). See msgfmt tool and MOFiles builder.

MSGFMTFLAGS

Additional flags to msgfmt(1). See msgfmt tool and MOFiles builder.

MSGINIT

Path to msginit(1) program (found via Detect()). See msginit tool and POInit builder.

MSGINITCOM

Complete command line to run msginit(1) program. See msginit tool and POInit builder.

MSGINITCOMSTR

String to display when msginit(1) is invoked (default: '', which means ``print $MSGINITCOM''). See msginit tool and POInit builder.

MSGINITFLAGS

List of additional flags to msginit(1) (default: []). See msginit tool and POInit builder.

_MSGINITLOCALE

Internal ``macro''. Computes locale (language) name based on target filename (default: '${TARGET.filebase}').

See msginit tool and POInit builder.

MSGMERGE

Absolute path to msgmerge(1) binary as found by Detect(). See msgmerge tool and POUpdate builder.

MSGMERGECOM

Complete command line to run msgmerge(1) command. See msgmerge tool and POUpdate builder.

MSGMERGECOMSTR

String to be displayed when msgmerge(1) is invoked (default: '', which means ``print $MSGMERGECOM''). See msgmerge tool and POUpdate builder.

MSGMERGEFLAGS

Additional flags to msgmerge(1) command. See msgmerge tool and POUpdate builder.

MSSDK_DIR

The directory containing the Microsoft SDK (either Platform SDK or Windows SDK) to be used for compilation.

MSSDK_VERSION

The version string of the Microsoft SDK (either Platform SDK or Windows SDK) to be used for compilation. Supported versions include 6.1, 6.0A, 6.0, 2003R2 and 2003R1.

MSVC_BATCH

When set to any true value, specifies that SCons should batch compilation of object files when calling the Microsoft Visual C/C++ compiler. All compilations of source files from the same source directory that generate target files in a same output directory and were configured in SCons using the same construction environment will be built in a single call to the compiler. Only source files that have changed since their object files were built will be passed to each compiler invocation (via the $CHANGED_SOURCES construction variable). Any compilations where the object (target) file base name (minus the .obj) does not match the source file base name will be compiled separately.

MSVC_USE_SCRIPT

Use a batch script to set up Microsoft Visual Studio compiler

$MSVC_USE_SCRIPT overrides $MSVC_VERSION and $TARGET_ARCH. If set to the name of a Visual Studio .bat file (e.g. vcvars.bat), SCons will run that bat file and extract the relevant variables from the result (typically %INCLUDE%, %LIB%, and %PATH%). Setting MSVC_USE_SCRIPT to None bypasses the Visual Studio autodetection entirely; use this if you are running SCons in a Visual Studio cmd window and importing the shell's environment variables.

MSVC_VERSION

Sets the preferred version of Microsoft Visual C/C++ to use.

If $MSVC_VERSION is not set, SCons will (by default) select the latest version of Visual C/C++ installed on your system. If the specified version isn't installed, tool initialization will fail. This variable must be passed as an argument to the Environment() constructor; setting it later has no effect.

Valid values for Windows are 12.0, 12.0Exp, 11.0, 11.0Exp, 10.0, 10.0Exp, 9.0, 9.0Exp, 8.0, 8.0Exp, 7.1, 7.0, and 6.0. Versions ending in Exp refer to "Express" or "Express for Desktop" editions.

MSVS

When the Microsoft Visual Studio tools are initialized, they set up this dictionary with the following keys:

VERSION

the version of MSVS being used (can be set via $MSVS_VERSION)

VERSIONS

the available versions of MSVS installed

VCINSTALLDIR

installed directory of Visual C++

VSINSTALLDIR

installed directory of Visual Studio

FRAMEWORKDIR

installed directory of the .NET framework

FRAMEWORKVERSIONS

list of installed versions of the .NET framework, sorted latest to oldest.

FRAMEWORKVERSION

latest installed version of the .NET framework

FRAMEWORKSDKDIR

installed location of the .NET SDK.

PLATFORMSDKDIR

installed location of the Platform SDK.

PLATFORMSDK_MODULES

dictionary of installed Platform SDK modules, where the dictionary keys are keywords for the various modules, and the values are 2-tuples where the first is the release date, and the second is the version number.

If a value isn't set, it wasn't available in the registry.

MSVS_ARCH

Sets the architecture for which the generated project(s) should build.

The default value is x86. amd64 is also supported by SCons for some Visual Studio versions. Trying to set $MSVS_ARCH to an architecture that's not supported for a given Visual Studio version will generate an error.

MSVS_PROJECT_GUID

The string placed in a generated Microsoft Visual Studio project file as the value of the ProjectGUID attribute. There is no default value. If not defined, a new GUID is generated.

MSVS_SCC_AUX_PATH

The path name placed in a generated Microsoft Visual Studio project file as the value of the SccAuxPath attribute if the MSVS_SCC_PROVIDER construction variable is also set. There is no default value.

MSVS_SCC_CONNECTION_ROOT

The root path of projects in your SCC workspace, i.e the path under which all project and solution files will be generated. It is used as a reference path from which the relative paths of the generated Microsoft Visual Studio project and solution files are computed. The relative project file path is placed as the value of the SccLocalPath attribute of the project file and as the values of the SccProjectFilePathRelativizedFromConnection[i] (where [i] ranges from 0 to the number of projects in the solution) attributes of the GlobalSection(SourceCodeControl) section of the Microsoft Visual Studio solution file. Similarly the relative solution file path is placed as the values of the SccLocalPath[i] (where [i] ranges from 0 to the number of projects in the solution) attributes of the GlobalSection(SourceCodeControl) section of the Microsoft Visual Studio solution file. This is used only if the MSVS_SCC_PROVIDER construction variable is also set. The default value is the current working directory.

MSVS_SCC_PROJECT_NAME

The project name placed in a generated Microsoft Visual Studio project file as the value of the SccProjectName attribute if the MSVS_SCC_PROVIDER construction variable is also set. In this case the string is also placed in the SccProjectName0 attribute of the GlobalSection(SourceCodeControl) section of the Microsoft Visual Studio solution file. There is no default value.

MSVS_SCC_PROVIDER

The string placed in a generated Microsoft Visual Studio project file as the value of the SccProvider attribute. The string is also placed in the SccProvider0 attribute of the GlobalSection(SourceCodeControl) section of the Microsoft Visual Studio solution file. There is no default value.

MSVS_VERSION

Sets the preferred version of Microsoft Visual Studio to use.

If $MSVS_VERSION is not set, SCons will (by default) select the latest version of Visual Studio installed on your system. So, if you have version 6 and version 7 (MSVS .NET) installed, it will prefer version 7. You can override this by specifying the MSVS_VERSION variable in the Environment initialization, setting it to the appropriate version ('6.0' or '7.0', for example). If the specified version isn't installed, tool initialization will fail.

This is obsolete: use $MSVC_VERSION instead. If $MSVS_VERSION is set and $MSVC_VERSION is not, $MSVC_VERSION will be set automatically to $MSVS_VERSION. If both are set to different values, scons will raise an error.

MSVSBUILDCOM

The build command line placed in a generated Microsoft Visual Studio project file. The default is to have Visual Studio invoke SCons with any specified build targets.

MSVSCLEANCOM

The clean command line placed in a generated Microsoft Visual Studio project file. The default is to have Visual Studio invoke SCons with the -c option to remove any specified targets.

MSVSENCODING

The encoding string placed in a generated Microsoft Visual Studio project file. The default is encoding Windows-1252.

MSVSPROJECTCOM

The action used to generate Microsoft Visual Studio project files.

MSVSPROJECTSUFFIX

The suffix used for Microsoft Visual Studio project (DSP) files. The default value is .vcproj when using Visual Studio version 7.x (.NET) or later version, and .dsp when using earlier versions of Visual Studio.

MSVSREBUILDCOM

The rebuild command line placed in a generated Microsoft Visual Studio project file. The default is to have Visual Studio invoke SCons with any specified rebuild targets.

MSVSSCONS

The SCons used in generated Microsoft Visual Studio project files. The default is the version of SCons being used to generate the project file.

MSVSSCONSCOM

The default SCons command used in generated Microsoft Visual Studio project files.

MSVSSCONSCRIPT

The sconscript file (that is, SConstruct or SConscript file) that will be invoked by Visual Studio project files (through the $MSVSSCONSCOM variable). The default is the same sconscript file that contains the call to MSVSProject to build the project file.

MSVSSCONSFLAGS

The SCons flags used in generated Microsoft Visual Studio project files.

MSVSSOLUTIONCOM

The action used to generate Microsoft Visual Studio solution files.

MSVSSOLUTIONSUFFIX

The suffix used for Microsoft Visual Studio solution (DSW) files. The default value is .sln when using Visual Studio version 7.x (.NET), and .dsw when using earlier versions of Visual Studio.

MT

The program used on Windows systems to embed manifests into DLLs and EXEs. See also $WINDOWS_EMBED_MANIFEST.

MTEXECOM

The Windows command line used to embed manifests into executables. See also $MTSHLIBCOM.

MTFLAGS

Flags passed to the $MT manifest embedding program (Windows only).

MTSHLIBCOM

The Windows command line used to embed manifests into shared libraries (DLLs). See also $MTEXECOM.

MWCW_VERSION

The version number of the MetroWerks CodeWarrior C compiler to be used.

MWCW_VERSIONS

A list of installed versions of the MetroWerks CodeWarrior C compiler on this system.

NAME

Specfies the name of the project to package.

no_import_lib

When set to non-zero, suppresses creation of a corresponding Windows static import lib by the SharedLibrary builder when used with MinGW, Microsoft Visual Studio or Metrowerks. This also suppresses creation of an export (.exp) file when using Microsoft Visual Studio.

OBJPREFIX

The prefix used for (static) object file names.

OBJSUFFIX

The suffix used for (static) object file names.

P4

The Perforce executable.

P4COM

The command line used to fetch source files from Perforce.

P4COMSTR

The string displayed when fetching a source file from Perforce. If this is not set, then $P4COM (the command line) is displayed.

P4FLAGS

General options that are passed to Perforce.

PACKAGEROOT

Specifies the directory where all files in resulting archive will be placed if applicable. The default value is "$NAME-$VERSION".

PACKAGETYPE

Selects the package type to build. Currently these are available:

* msi - Microsoft Installer * rpm - Redhat Package Manger * ipkg - Itsy Package Management System * tarbz2 - compressed tar * targz - compressed tar * zip - zip file * src_tarbz2 - compressed tar source * src_targz - compressed tar source * src_zip - zip file source

This may be overridden with the "package_type" command line option.

PACKAGEVERSION

The version of the package (not the underlying project). This is currently only used by the rpm packager and should reflect changes in the packaging, not the underlying project code itself.

PCH

The Microsoft Visual C++ precompiled header that will be used when compiling object files. This variable is ignored by tools other than Microsoft Visual C++. When this variable is defined SCons will add options to the compiler command line to cause it to use the precompiled header, and will also set up the dependencies for the PCH file. Example:

env['PCH'] = 'StdAfx.pch'

PCHCOM

The command line used by the PCH builder to generated a precompiled header.