SCONS(1) SCONS(1) NNAAMMEE scons - a software construction tool SSYYNNOOPPSSIISS ssccoonnss [ _o_p_t_i_o_n_s... ] [ _n_a_m_e=_v_a_l... ] [ _t_a_r_g_e_t_s... ] DDEESSCCRRIIPPTTIIOONN The ssccoonnss utility builds software (or other files) by determining which component pieces must be rebuilt and executing the necessary commands to rebuild them. By default, ssccoonnss searches for a file named _S_C_o_n_s_t_r_u_c_t, _S_c_o_n_s_t_r_u_c_t, or _s_c_o_n_s_t_r_u_c_t (in that order) in the current directory and reads its con- figuration from the first file found. An alternate file name may be specified via the --ff option. The _S_C_o_n_s_t_r_u_c_t file can specify subsidiary configuration files using the SSCCoonnssccrriipptt(()) function. By convention, these subsidiary files are named _S_C_o_n_s_c_r_i_p_t, although any name may be used. (Because of this nam- ing convention, the term "SConscript files" is sometimes used to refer generically to all ssccoonnss 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 pro- grams, object files, libraries), so that for most software projects, only the target and input files need be specified. ssccoonnss 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. ssccoonnss, however, reads and executes all of the SCon- script files _b_e_f_o_r_e it begins building any targets. To make this obvi- ous, ssccoonnss 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 --QQ option. ssccoonnss does not automatically propagate the external environment used to execute ssccoonnss 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 ssccoonnss is invoked. This also means that if the compiler or other commands that you want to use to build your tar- get files are not in standard system locations, ssccoonnss will not find them unless you explicitly set the PATH to include those locations. Whenever you create an ssccoonnss construction environment, you can propa- gate the value of PATH from your external environment as follows: import os env = Environment(ENV = {'PATH' : os.environ['PATH']}) ssccoonnss can scan known input files automatically for dependency informa- tion (for example, #include statements in C or C++ files) and will rebuild dependent files appropriately whenever any "included" input file changes. ssccoonnss supports the ability to define new scanners for unknown input file types. ssccoonnss knows how to fetch files automatically from SCCS or RCS subdirec- tories using SCCS, RCS or BitKeeper. ssccoonnss is normally executed in a top-level directory containing a _S_C_o_n_- _s_t_r_u_c_t 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 DDeeffaauulltt(()) function, described below. Even when DDeeffaauulltt(()) 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 tar- get: 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 necessary. The --cc 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. A subset of a hierarchical tree may be built by remaining at the top- level directory (where the _S_C_o_n_s_t_r_u_c_t file lives) and specifying the subdirectory as the target to be built: scons src/subdir or by changing directory and invoking scons with the --uu option, which traverses up the directory hierarchy until it finds the _S_C_o_n_s_t_r_u_c_t file, and then builds targets relatively to the current subdirectory: cd src/subdir scons -u . ssccoonnss supports building multiple targets in parallel via a --jj 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. ssccoonnss 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 ssccoonnss 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 ----ccaacchhee--ffoorrccee, ----ccaacchhee-- ddiissaabbllee, and ----ccaacchhee--sshhooww command-line options. The ----rraannddoomm 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 spec- ified 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. ssccoonnss requires Python version 1.5.2 or later. There should be no other dependencies or requirements to run ssccoonnss.. By default, ssccoonnss knows how to search for available programming tools on various systems. On WIN32 systems, ssccoonnss 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, ssccoonnss 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, ssccoonnss 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, ssccoonnss 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 con- struction variables. OOPPTTIIOONNSS In general, ssccoonnss supports the same command-line options as GNU mmaakkee, and many of those supported by ccoonnss. -b Ignored for compatibility with non-GNU versions of mmaakkee.. -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() func- tion. --cache-disable, --no-cache Disable the derived-file caching specified by CCaacchheeDDiirr(). ssccoonnss will neither retrieve files from the cache nor copy files to the cache. --cache-force, --cache-populate When using CCaacchheeDDiirr(), 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 ----ccaacchhee--ddiissaabbllee option. --cache-show When using CCaacchheeDDiirr() 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=_m_o_d_e This specifies how the CCoonnffiigguurree 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 _d_i_r_e_c_t_o_r_y, --directory=_d_i_r_e_c_t_o_r_y Change to the specified _d_i_r_e_c_t_o_r_y before searching for the _S_C_o_n_- _s_t_r_u_c_t, _S_c_o_n_s_t_r_u_c_t, or _s_c_o_n_s_t_r_u_c_t file, or doing anything else. Multiple --CC options are interpreted relative to the previous one, and the right-most --CC option wins. (This option is nearly equivalent to --ff ddiirreeccttoorryy//SSCCoonnssttrruucctt, except that it will search for _S_C_o_n_s_t_r_u_c_t, _S_c_o_n_s_t_r_u_c_t, or _s_c_o_n_s_t_r_u_c_t in the speci- fied directory.) -D Works exactly the same way as the --uu 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=_t_y_p_e Debug the build process. _t_y_p_e specifies what type of debugging: --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 only works when run under Python 2.1 or later. --debug=dtree Print the dependency tree after each top-level target is built. This prints out only derived files. --debug=findlibs Instruct the scanner that searches for libraries to print a mes- sage 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 in the Memoizer, the inter- nal SCons subsystem for caching various 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=objects Prints a list of the various objects of the various classes used internally by SCons. This only works when run under Python 2.1 or later. --debug=pdb Re-run SCons under the control of the pdb Python debugger. --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 $SHCCFLAGS $CPPFLAGS $_CPPINCFLAGS -c -o $TARGET $SOURCES --debug=stacktrace Prints an internal Python stack trace when encountering an oth- erwise unexplained error. --debug=stree Print the dependency tree along with status information. This is the same as the debug=tree option, but additional status information is provided for each node in the tree. --debug=time Prints various time profiling information: the time spent exe- cuting each build command, the total build time, the total time spent executing build commands, the total time spent executing SConstruct and SConscript files, and the total time spent exe- cuting SCons itself. --debug=tree Print the dependency tree after each top-level target is built. This prints out the complete dependency tree including implicit dependencies and ignored dependencies. -f _f_i_l_e, --file=_f_i_l_e, --makefile=_f_i_l_e, --sconstruct=_f_i_l_e Use _f_i_l_e as the initial SConscript file. -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 --HH 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 _d_i_r_e_c_t_o_r_y, --include-dir=_d_i_r_e_c_t_o_r_y Specifies a _d_i_r_e_c_t_o_r_y to search for imported Python modules. If several --II options are used, the directories are searched in the order specified. --implicit-cache Cache implicit dependencies. This can cause ssccoonnss to 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) than a current implicit dependency with the same name. --implicit-deps-changed Force SCons to ignore the cached implicit dependencies. This causes the implicit dependencies to be rescanned and recached. This implies ----iimmpplliicciitt--ccaacchhee. --implicit-deps-unchanged Force SCons to ignore changes in the implicit dependencies. This causes cached implicit dependencies to always be used. This implies ----iimmpplliicciitt--ccaacchhee. -j _N, --jobs=_N Specifies the number of jobs (commands) to run simultaneously. If there is more than one --jj 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. --duplicate=_O_R_D_E_R 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. _O_R_D_E_R must be one of _h_a_r_d_-_s_o_f_t_-_c_o_p_y (the default), _s_o_f_t_-_h_a_r_d_-_c_o_p_y, _h_a_r_d_- _c_o_p_y, _s_o_f_t_-_c_o_p_y or _c_o_p_y. SCons will attempt to duplicate files using the mechanisms in the specified order. -m Ignored for compatibility with non-GNU versions of mmaakkee. --max-drift=_S_E_C_O_N_D_S Set the maximum expected drift in the modification time of files to _S_E_C_O_N_D_S. This value determines how old a file must be before its content signature is cached. 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 content signature cached. A nega- tive 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 cache the signature, no matter how old the file is. -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. --profile=_f_i_l_e Run SCons under the Python profiler and save the results in the specified _f_i_l_e. 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 tar- get files. Also suppresses SCons status messages. -S, --no-keep-going, --stop Ignored for compatibility with GNU mmaakkee. -t, --touch Ignored for compatibility with GNU mmaakkee. (Touching a file to make it appear up-to-date is unnecessary when using ssccoonnss.) -u, --up, --search-up Walks up the directory structure until an _S_C_o_n_s_t_r_u_c_t _, _S_c_o_n_- _s_t_r_u_c_t or _s_c_o_n_s_t_r_u_c_t 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 --uu 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 ssccoonnss 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. --warn=_t_y_p_e, --warn=no-_t_y_p_e Enable or disable warnings. _t_y_p_e specifies the type of warnings to be enabled or disabled: --warn=all, --warn=no-all Enables or disables all warnings. --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 warnings about use of deprecated features. 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. --no-print-directory Turn off -w, even if it was turned on implicitly. -Y _r_e_p_o_s_i_t_o_r_y, --repository=_r_e_p_o_s_i_t_o_r_y Search the specified repository for any input and target files not found in the local directory hierarchy. Multiple --YY options may specified, in which case the repositories are searched in the order specified. CCOONNFFIIGGUURRAATTIIOONN FFIILLEE RREEFFEERREENNCCEE CCoonnssttrruuccttiioonn EEnnvviirroonnmmeennttss A construction environment is the basic means by which the SConscript files communicate build information to ssccoonnss. A new construction envi- ronment is created using the EEnnvviirroonnmmeenntt function: env = Environment() 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 plat- form: env = Environment(platform = 'cygwin') env = Environment(platform = 'os2') env = Environment(platform = 'posix') env = Environment(platform = 'win32') Specifying a platform initializes the appropriate construction vari- ables in the environment to use and generate file names with prefixes and suffixes appropriate for the platform. Note that the wwiinn3322 platform adds the SSYYSSTTEEMMRROOOOTT variable from the user's external environment to the construction environment's EENNVV dic- tionary. 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 ::ppsseerrvveerr::aannoonnyymmoouuss@@ccvvss..ssoouurrccee-- ffoorrggee..nneett:://ccvvssrroooott//ssccoonnss) will work on Win32 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 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 ggeenneerraattee(()) func- tion 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 eexxiissttss(()) 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. 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 (_t_o_o_l_n_a_m_e, _k_w___d_i_c_t). SCons searches for the _t_o_o_l_n_a_m_e specification file as described above, and passes _k_w___d_i_c_t, which must be a dictionary, as keyword arguments to the tool's ggeenneerraattee function. The ggeenneerraattee function can use the arguments to modify the tool's behavior by setting up the environment in different ways or oth- erwise 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 plat- forms. 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 aixc++ aixcc aixf77 aixlink ar as bcc32 c++ cc cvf dmd dvipdf dvips f77 f90 f95 fortran g++ g77 gas gcc gnulink gs hpc++ hpcc hplink icc icl ifl ifort ilink ilink32 intelc jar javac javah latex lex link linkloc m4 masm midl mingw mslib mslink msvc msvs mwcc mwld nasm pdflatex pdftex qt rmic rpcgen sgiar sgic++ sgicc sgilink sunar sunc++ suncc sunlink swig tar tex tlib yacc zip Additionally, there is a "tool" named ddeeffaauulltt 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 win32 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. BBuuiillddeerr MMeetthhooddss Build rules are specified by calling a construction environment's builder methods. The arguments to the builder methods are ttaarrggeett (a list of target files) and ssoouurrccee (a list of source files). Because long lists of file names can lead to a lot of quoting, ssccoonnss supplies a SSpplliitt(()) 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 string.split() method from the standard Python library, 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 call- ing 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 = string.split('bar.c 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 ssccoonnss will deduce the target file name from the source file name. The following examples all build the executable program bbaarr (on POSIX systems) or bbaarr..eexxee (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') It is possible to override or add construction variables when calling a builder method by passing additional keyword arguments. These overrid- den 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 nonstandard suffix: env.SharedLibrary('word', 'word.cpp', SHLIBSUFFIX='.ocx') Although the builder methods defined by ssccoonnss 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 con- struction environment that consists of the tools and values that ssccoonnss 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 of Nodes that represent the target or targets that will be built. A _N_o_d_e is an internal SCons object which represents build targets or sources. The returned Node(s) 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 --DD 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 FFllaatttteenn() supplied by scons to create a list con- taining 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) The path name for a Node's file may be used by passing the Node to the Python-builtin ssttrr(()) 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 ((bbaarr__oobbjj__lliisstt[[00]])) to get at the Node that actually represents the object file. Builder calls support a cchhddiirr keyword argument that specifies that the Builder's action(s) should be executed after changing directory. If the cchhddiirr argument is a string or a directory Node, scons will change to the specified directory. If the cchhddiirr 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 _n_o_t automatically modify its expansion of con- struction variables like $$TTAARRGGEETT and $$SSOOUURRCCEE when using the chdir key- word argument--that is, the expanded file names will still be relative to the top-level SConstruct directory, and consequently incorrect rela- tive to the chdir directory. If you use the chdir keyword argument, you will typically need to supply a different command line using expan- sions like $${{TTAARRGGEETT..ffiillee}} and $${{SSOOUURRCCEE..ffiillee}} to use just the filename portion of the targets and source. ssccoonnss 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') 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') DVI() env.DVI() Builds a .dvi file from a .tex, .ltx or .latex input file. If the source file suffix is .tex, ssccoonnss will examine the contents of the file; if the string ooccuummeennttccllaassss or ooccuummeennttssttyyllee 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 DDVVII builder method will also examine the contents of the ..aauuxx ffiillee and invoke the $BIBTEX command line if the string bbiibbddaattaa is found, and will examine the contents ..lloogg 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') Jar() env.Jar() Builds a Java archive (.jar) file from a source tree of .class files. If the $JARCHDIR value is set, the jjaarr command will change to the specified directory using the --CC option. If the contents any of the source files begin with the string MMaanniiffeesstt-- VVeerrssiioonn, the file is assumed to be a manifest and is passed to the jjaarr command with the mm option set. env.Jar(target = 'foo.jar', source = 'classes') Java() env.Java() Builds one or more Java class files from one or more source trees of .java files. The class files will be placed underneath the specified target directory. 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. 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 ppaacckkaaggee in the first column; the resulting .class files will be placed in a directory reflecting the specified package name. For example, the file _F_o_o_._j_a_v_a defining a single public _F_o_o class and containing a package name of _s_u_b_._d_i_r will generate a corresponding _s_u_b_/_d_i_r_/_F_o_o_._c_l_a_s_s class file. Example: env.Java(target = 'classes', source = 'src') env.Java(target = 'classes', source = ['src1', 'src2']) 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 either the names of .class files, or the objects returned from the JJaavvaa builder method. If the construction variable JJAAVVAACCLLAASSSSDDIIRR is set, either in the environment or in the call to the JJaavvaaHH builder method itself, then the value of the variable will be stripped from the begin- ning 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 SSttaattiiccLLiibbrraarryy builder method. LoadableModule() env.LoadableModule() On most systems, this is the same as SShhaarreeddLLiibbrraarryy(). 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 --EE, 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 MSVSProject() env.MSVSProject() Builds Microsoft Visual Studio project files. This builds a Visual Studio project file, based on the version of Visual Stu- dio that is configured (either the latest installed version, or the version set by MMSSVVSS__VVEERRSSIIOONN in the Environment constructor). For VS 6, it will generate ..ddsspp and ..ddssww files, for VS 7, it will generate ..vvccpprroojj and ..ssllnn files. It takes several lists of filenames to be placed into the project file, currently these are limited to ssrrccss,, iinnccss,, llooccaall-- iinnccss,, rreessoouurrcceess,, and mmiisscc.. These are pretty self explanatory, but it should be noted that the 'srcs' list is NOT added to the $SOURCES environment variable. This is because it represents a list of files to be added to the project file, not the source used to build the project file (in this case, the 'source' is the SConscript file used to call MSVSProject). In addition to these values (which are all optional, although not specifying any of them results in an empty project file), the following values must be specified: target: The name of the target .dsp or .vcproj file. The cor- rect suffix for the version of Visual Studio must be used, but the value env['MSVSPROJECTSUFFIX'] will be defined to the correct value (see example below). variant: The name of this particular variant. These are typi- cally things like "Debug" or "Release", but really can be any- thing you want. 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. buildtarget: A list of SCons.Node.FS objects which is returned from the command which builds the target. This is used to tell SCons what to build when the 'build' button is pressed inside of the IDE. Example Usage: barsrcs = ['bar.cpp'], barincs = ['bar.h'], barlocalincs = ['StdAfx.h'] barresources = ['bar.rc','resource.h'] barmisc = ['bar_readme.txt'] dll = local.SharedLibrary(target = 'bar.dll', source = barsrcs) local.MSVSProject(target = 'Bar' + env['MSVSPROJECTSUFFIX'], srcs = barsrcs, incs = barincs, localincs = barlocalincs, resources = barresources, misc = barmisc, buildtarget = dll, variant = 'Release') Object() env.Object() A synonym for the SSttaattiiccOObbjjeecctt builder method. 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. Nor- mally the object file is ignored. This builder method is only provided when Microsoft Visual C++ is being used as the com- piler. The PCH builder method is generally used in conjuction 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. Exam- ple: # 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') 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 auto- matically 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') 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 OObbjjeecctt 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 _._r_e_s (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 JJaavvaa builder method. If the construction variable JJAAVVAACCLLAASSSSDDIIRR is set, either in the environment or in the call to the RRMMIICC builder method itself, then the value of the variable will be stripped from the begin- ning 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 WIN32) given one or more object files or C, C++, D or Fortran source files. If any source files are given, then they will be auto- matically 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 con- struction variable; by default, lib on POSIX systems, nothing on Windows systems) and suffix (specified by the $SHLIBSUFFIX con- struction 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 WIN32 systems, the SShhaarreeddLLiibbrraarryy 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. Any object files listed in the ssoouurrccee must have been built for a shared library (that is, using the SShhaarreeddOObbjjeecctt builder method). ssccoonnss will raise an error if there is any mismatch. On WIN32 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 "/s", to prevent dialogs from popping up and requiring user attention when it is run. If you change $REGSVRFLAGS, be sure to include "/s". 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 SSttaattiiccOObbjjeecctt builder method. On some platforms building a shared object requires additional compiler options (e.g. -fPIC for gcc) in addition to those needed to build a nor- mal (static) object, but on some platforms there is no differ- ence 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 pre- fix (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 map- pings in SSoouurrcceeFFiilleeSSccaannnneerr object. See the section "Scanner Objects," below, for a 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 ssoouurrccee must have been built for a static library (that is, using the SSttaattiiccOObbjjeecctt builder method). ssccoonnss 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 For- tran source files. Source files must have one of the following extensions: .asm assembly language file .ASM assembly language file .c C file .C WIN32: 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 WIN32: 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 .s assembly language file .S WIN32: assembly language file 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 con- struction variable; nothing by default) and suffix (specified by the $OBJSUFFIX construction variable; 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 map- pings in SSoouurrcceeFFiilleeSSccaannnneerr object. See the section "Scanner Objects," below, for a more information. Tar() env.Tar() Builds a tar archive of the specified files and/or directories. Unlike most builder methods, the TTaarr 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 ssccoonnss 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') TypeLibrary() env.TypeLibrary() Builds a Windows type library (.tlb) file from and input IDL file (.idl). In addition, it will build the associated inteface stub and proxy source files. It names 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. 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 inputs for Program, Library and SharedLibrary without using this builder. Using the builder lets you override the standard naming conven- tions (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 ZZiipp 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 ssccoonnss 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 DDeeppeennddss method of a construction environment (see below). In addition, ssccoonnss automatically scans source files for various pro- gramming 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 ..FF (POSIX systems only), ..ffpppp,, or ..FFPPPP file extensions, and assembly language files with ..SS (POSIX systems only), ..sspppp,, or ..SSPPPP 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 OObbjjeecctt() SSttaattiiccOObbjjeecctt() and SShhaarreeddOObbjjeecctt() Builders by adding them to the SSoouurrcceeFFiilleeSSccaannnneerr object as follows: See the section "Scanner Objects," below, for a more information about defining your own Scanner objects. MMeetthhooddss aanndd FFuunnccttiioonnss ttoo DDoo TThhiinnggss In addition to Builder methods, ssccoonnss provides a number of other con- struction 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(_a_r_g_u_m_e_n_t_s) and if you call something through a construction environment it looks like: env.Function(_a_r_g_u_m_e_n_t_s) 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 vari- ables into any supplied strings. For example: env = Environment(FOO = 'foo') Default('$FOO') env.Default('$FOO') the first call to the global DDeeffaauulltt(()) function will actually add a target named $$FFOOOO to the list of default targets, while the second call to the eennvv..DDeeffaauulltt(()) construction environment method will expand the value and add a target named ffoooo to the list of default targets. For more on construction variable expansion, see the next section on con- struction variables. Construction environment methods and global functions supported by ssccoonnss include: Action(_a_c_t_i_o_n, [_s_t_r_f_u_n_c_t_i_o_n, _v_a_r_l_i_s_t]) env.Action(_a_c_t_i_o_n, [_s_t_r_f_u_n_c_t_i_o_n, _v_a_r_l_i_s_t]) Creates an Action object for the specified _a_c_t_i_o_n. See the sec- tion "Action Objects," below, for a complete explanation of the arguments and behavior. AddPostAction(_t_a_r_g_e_t, _a_c_t_i_o_n) env.AddPostAction(_t_a_r_g_e_t, _a_c_t_i_o_n) Arranges for the specified _a_c_t_i_o_n to be performed after the specified _t_a_r_g_e_t has been built. The specified action(s) may be an Action object, or anything that can be converted into an Action object (see below). AddPreAction(_t_a_r_g_e_t, _a_c_t_i_o_n) env.AddPreAction(_t_a_r_g_e_t, _a_c_t_i_o_n) Arranges for the specified _a_c_t_i_o_n to be performed before the specified _t_a_r_g_e_t is built. The specified action(s) may be an Action object, or anything that can be converted into an Action object (see below). Alias(_a_l_i_a_s, [_t_a_r_g_e_t_s, [_a_c_t_i_o_n]]) env.Alias(_a_l_i_a_s, [_t_a_r_g_e_t_s, [_a_c_t_i_o_n]]) Creates one or more phony targets that expand to one or more other targets. An optional _a_c_t_i_o_n (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 repre- senting 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. AAlliiaass can be called multiple times for the same alias to add additional tar- gets to the alias, or additional actions to the list for this alias. 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") AlwaysBuild(_t_a_r_g_e_t, ...) env.AlwaysBuild(_t_a_r_g_e_t, ...) Marks each given _t_a_r_g_e_t so that it is always assumed to be out of date, and will always be rebuilt if needed. Note, however, that AAllwwaayyssBBuuiilldd() does not add its target(s) to the default target list, so the targets will only be built if they are spec- ified on the command line, or are a dependent of a target speci- fied on the command line--but they will _a_l_w_a_y_s be built if so specified. Multiple targets can be passed in to a single call to AAllwwaayyssBBuuiilldd(). env.Append(_k_e_y=_v_a_l, [...]) Appends the specified keyword arguments to the end of construc- tion 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.) env.Append(CCFLAGS = ' -g', FOO = ['foo.yyy']) env.AppendENVPath(_n_a_m_e, _n_e_w_p_a_t_h, [_e_n_v_n_a_m_e, _s_e_p]) This appends new path elements to the given path in the speci- fied external environment (EENNVV 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 ooss..ppaatthh..nnoorrmmppaatthh and ooss..ppaatthh..nnoorrmmccaassee). 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. Example: print 'before:',env['ENV']['INCLUDE'] include_path = '/foo/bar:/foo' env.PrependENVPath('INCLUDE', include_path) print 'after:',env['ENV']['INCLUDE'] yields: before: /foo:/biz after: /biz:/foo/bar:/foo env.AppendUnique(_k_e_y=_v_a_l, [...]) Appends the specified keyword arguments to the end of construc- tion 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 construc- tion variable will _n_o_t be added again to the list. 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 SSoouurrcceeCCooddee function. env.SourceCode('.', env.BitKeeper()) BuildDir(_b_u_i_l_d___d_i_r, _s_r_c___d_i_r, [_d_u_p_l_i_c_a_t_e]) env.BuildDir(_b_u_i_l_d___d_i_r, _s_r_c___d_i_r, [_d_u_p_l_i_c_a_t_e]) This specifies a build directory _b_u_i_l_d___d_i_r in which to build all derived files that would normally be built under _s_r_c___d_i_r. Mul- tiple build directories can be set up for multiple build vari- ants, for example. _s_r_c___d_i_r must be underneath the SConstruct file's directory, and _b_u_i_l_d___d_i_r may not be underneath the _s_r_c___d_i_r _. The default behavior is for ssccoonnss to duplicate all of the files in the tree underneath _s_r_c___d_i_r into _b_u_i_l_d___d_i_r, and then build the derived files within the copied tree. (The duplication is performed by linking or copying, depending on the platform; see also the _-_-_d_u_p_l_i_c_a_t_e option.) This guarantees correct builds regardless of whether intermediate source files are generated during the build, where preprocessors or other scanners search for included files, or whether individual compilers or other invoked tools are hard-coded to put derived files in the same directory as source files. This behavior of making a complete copy of the source tree may be disabled by setting _d_u_p_l_i_c_a_t_e to 0. This will cause ssccoonnss to invoke Builders using the path names of source files in _s_r_c___d_i_r and the path names of derived files within _b_u_i_l_d___d_i_r. This is always more efficient than _d_u_p_l_i_c_a_t_e=1, and is usually safe for most builds. Specifying _d_u_p_l_i_c_a_t_e=0, however, may cause build problems if source files are generated during the build, if any invoked tools are hard-coded to put derived files in the same directory as the source files. Note that specifying a BBuuiillddDDiirr works most naturally with a sub- sidiary SConscript file in the source directory. However, you would then call the subsidiary SConscript file not in the source directory, but in the _b_u_i_l_d___d_i_r _, as if ssccoonnss had made a virtual copy of the source tree regardless of the value of _d_u_p_l_i_c_a_t_e. This is how you tell ssccoonnss which variant of a source tree to build. For example: BuildDir('build-variant1', 'src') SConscript('build-variant1/SConscript') BuildDir('build-variant2', 'src') SConscript('build-variant2/SConscript') See also the SSCCoonnssccrriipptt() function, described below, for another way to specify a build directory in conjunction with calling a subsidiary SConscript file.) Builder(_a_c_t_i_o_n, [_a_r_g_u_m_e_n_t_s]) env.Builder(_a_c_t_i_o_n, [_a_r_g_u_m_e_n_t_s]) Creates a Builder object for the specified _a_c_t_i_o_n. See the sec- tion "Builder Objects," below, for a complete explanation of the arguments and behavior. CacheDir(_c_a_c_h_e___d_i_r) env.CacheDir(_c_a_c_h_e___d_i_r) Specifies that ssccoonnss will maintain a cache of derived files in _c_a_c_h_e___d_i_r _. The derived files in the cache will be shared among all the builds using the same CCaacchheeDDiirr() call. When a CCaacchheeDDiirr() is being used and ssccoonnss 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, ssccoonnss will retrieve the file from the cache. If the derived file is not present in the cache, ssccoonnss 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 CCaacchheeDDiirr(()) may be disabled for any invocation by using the ----ccaacchhee--ddiissaabbllee option. If the ----ccaacchhee--ffoorrccee option is used, ssccoonnss will place a copy of _a_l_l 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 CCaacchheeDDiirr() is added to a build, or after using the ----ccaacchhee--ddiissaabbllee option. When using CCaacchheeDDiirr(), ssccoonnss will report, "Retrieved `file' from cache," unless the ----ccaacchhee--sshhooww option is being used. When the ----ccaacchhee--sshhooww option is used, ssccoonnss will print the action that _w_o_u_l_d 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. Clean(_t_a_r_g_e_t_s, _f_i_l_e_s___o_r___d_i_r_s) env.Clean(_t_a_r_g_e_t_s, _f_i_l_e_s___o_r___d_i_r_s) This specifies a list of files or directories which should be removed whenever the targets are specified with the --cc command line option. The specified targets may be a list or an individ- ual target. Multiple calls to CClleeaann() 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 sep- arate arguments to the CClleeaann() method, or as a list. CClleeaann() will also accept the return value of any of the construction environment Builder methods. Examples: Clean('foo', ['bar', 'baz']) Clean('dist', env.Program('hello', 'hello.c')) Clean(['foo', 'bar'], 'something_else_to_clean') Command(_t_a_r_g_e_t, _s_o_u_r_c_e, _c_o_m_m_a_n_d_s, [_k_e_y=_v_a_l, ...]) env.Command(_t_a_r_g_e_t, _s_o_u_r_c_e, _c_o_m_m_a_n_d_s, [_k_e_y=_v_a_l, ...]) Executes a specific action (or list of actions) to build a tar- get file or files. This is more convenient than defining a sep- arate Builder object for a single special-case build. As a special case, the ssoouurrccee__ssccaannnneerr keyword argument can be used to specify a Scanner object that will be used to scan the sources. (The global DDiirrSSccaannnneerr 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. Note that an action can be an external command, specified as a string, or a callable Python object; see "Action Objects," below. 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 ]) Configure(_e_n_v, [_c_u_s_t_o_m___t_e_s_t_s, _c_o_n_f___d_i_r, _l_o_g___f_i_l_e, _c_o_n_f_i_g___h]) env.Configure([_c_u_s_t_o_m___t_e_s_t_s, _c_o_n_f___d_i_r, _l_o_g___f_i_l_e, _c_o_n_f_i_g___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([_k_e_y=_v_a_l, ...]) Return 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. env2 = env.Copy() env3 = env.Copy(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.Copy(tools = ['msvc', MyTool]) env.CVS(_r_e_p_o_s_i_t_o_r_y, _m_o_d_u_l_e) A factory function that returns a Builder object to be used to fetch source files from the specified CVS _r_e_p_o_s_i_t_o_r_y. The returned Builder is intended to be passed to the SSoouurrcceeCCooddee function. The optional specified _m_o_d_u_l_e 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: # 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')) Default(_t_a_r_g_e_t_s) env.Default(_t_a_r_g_e_t_s) This specifies a list of default targets, which will be built by ssccoonnss if no explicit targets are given on the command line. Multiple calls to DDeeffaauulltt() are legal, and add to the list of default targets. Multiple targets should be specified as separate arguments to the DDeeffaauulltt() method, or as a list. DDeeffaauulltt() 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 DDeeffaauulltt() of NNoonnee will clear all default targets. Later calls to DDeeffaauulltt() will add to the (now empty) default- target list like normal. The current list of targets added using the DDeeffaauulltt() function or method is available in the DDEEFFAAUULLTT__TTAARRGGEETTSS list; see below. DefaultEnvironment([_a_r_g_s]) 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(_t_a_r_g_e_t, _d_e_p_e_n_d_e_n_c_y) env.Depends(_t_a_r_g_e_t, _d_e_p_e_n_d_e_n_c_y) Specifies an explicit dependency; the target file(s) will be rebuilt whenever the dependency file(s) has changed. This should only be necessary for cases where the dependency is not caught by a Scanner for the file. env.Depends('foo', 'other-input-file-for-foo') env.Dictionary([_v_a_r_s]) Returns a dictionary object containing copies of all of the con- struction variables in the environment. If there are any vari- able names specified, only the specified construction variables are returned in the dictionary. dict = env.Dictionary() cc_dict = env.Dictionary('CC', 'CCFLAGS', 'CCCOM') Dir(_n_a_m_e, [_d_i_r_e_c_t_o_r_y]) env.Dir(_n_a_m_e, [_d_i_r_e_c_t_o_r_y]) This returns a Directory Node, an object that represents the specified directory _n_a_m_e. _n_a_m_e can be a relative or absolute path. _d_i_r_e_c_t_o_r_y is an optional directory that will be used as the parent directory. If no _d_i_r_e_c_t_o_r_y is specified, the current script's directory is used as the parent. 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 situa- tions; see "File and Directory Nodes," below. env.Dump([_k_e_y]) Returns a pretty printable representation of the environment. _k_e_y, if not _N_o_n_e, should be a string containing the name of the variable of interest. This SConstruct: env=Environment() print env.Dump('CCCOM') will print: env=Environment() print env.Dump() will print: { 'AR': 'ar', 'ARCOM': '$AR $ARFLAGS $TARGET $SOURCES0RANLIB $RANLIBFLAGS $TARGET', 'ARFLAGS': ['r'], 'AS': 'as', 'ASCOM': '$AS $ASFLAGS -o $TARGET $SOURCES', 'ASFLAGS': [], ... EnsurePythonVersion(_m_a_j_o_r, _m_i_n_o_r) env.EnsurePythonVersion(_m_a_j_o_r, _m_i_n_o_r) Ensure that the Python version is at least _m_a_j_o_r._m_i_n_o_r. 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. EnsurePythonVersion(2,2) EnsureSConsVersion(_m_a_j_o_r, _m_i_n_o_r) env.EnsureSConsVersion(_m_a_j_o_r, _m_i_n_o_r) Ensure that the SCons version is at least _m_a_j_o_r._m_i_n_o_r. 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. EnsureSConsVersion(0,9) Environment([_k_e_y=_v_a_l_u_e, ...]) env.Environment([_k_e_y=_v_a_l_u_e, ...]) Return a new construction environment initialized with the spec- ified _k_e_y=_v_a_l_u_e pairs. Execute(_a_c_t_i_o_n, [_s_t_r_f_u_n_c_t_i_o_n, _v_a_r_l_i_s_t]) env.Execute(_a_c_t_i_o_n, [_s_t_r_f_u_n_c_t_i_o_n, _v_a_r_l_i_s_t]) Executes an Action object. The specified _a_c_t_i_o_n 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. Exit([_v_a_l_u_e]) env.Exit([_v_a_l_u_e]) This tells ssccoonnss to exit immediately with the specified _v_a_l_u_e. A default exit value of 00 (zero) is used if no value is speci- fied. Export(_v_a_r_s) env.Export(_v_a_r_s) This tells ssccoonnss 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 EExxppoorrtt() will over-write previous exports that have the same name. Multiple variable names can be passed to EExxppoorrtt() as sep- arate arguments or as a list. A dictionary can be used to map variables to a different name when exported. Both local vari- ables 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}) Note that the SSCCoonnssccrriipptt() function supports an _e_x_p_o_r_t_s argument that makes it easier to to export a variable or set of variables to a single SConscript file. See the description of the SSCCoonn-- ssccrriipptt() function, below. File(_n_a_m_e, [_d_i_r_e_c_t_o_r_y]) env.File(_n_a_m_e, [_d_i_r_e_c_t_o_r_y]) This returns a File Node, an object that represents the speci- fied file _n_a_m_e. _n_a_m_e can be a relative or absolute path. _d_i_r_e_c_t_o_r_y is an optional directory that will be used as the par- ent directory. 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(_f_i_l_e, _d_i_r_s) env.FindFile(_f_i_l_e, _d_i_r_s) Search for _f_i_l_e in the path specified by _d_i_r_s. _f_i_l_e may be a list of file names or a single file name. In addition to search- ing for files that exist in the filesytem, this function also searches for derived files that have not yet been built. foo = env.FindFile('foo', ['dir1', 'dir2']) Flatten(_s_e_q_u_e_n_c_e) env.Flatten(_s_e_q_u_e_n_c_e) Takes a sequence (that is, a Python list or tuple) that may con- tain 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: 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) GetBuildPath(_f_i_l_e, [_._._.]) env.GetBuildPath(_f_i_l_e, [_._._.]) Returns the ssccoonnss path name (or names) for the specified _f_i_l_e (or files). The specified _f_i_l_e or files may be ssccoonnss Nodes or strings representing path names. GetLaunchDir() env.GetLaunchDir() Returns the absolute path name of the directory from which ssccoonnss was initially invoked. This can be useful when using the --uu, --UU or --DD options, which internally change to the directory in which the SSCCoonnssttrruucctt file is found. GetOption(_n_a_m_e) env.GetOption(_n_a_m_e) This function provides a way to query a select subset of the scons command line options from a SConscript file. See _S_e_t_O_p_- _t_i_o_n() for a description of the options available. Help(_t_e_x_t) env.Help(_t_e_x_t) This specifies help text to be printed if the --hh argument is given to ssccoonnss. If HHeellpp is called multiple times, the text is appended together in the order that HHeellpp is called. Ignore(_t_a_r_g_e_t, _d_e_p_e_n_d_e_n_c_y) env.Ignore(_t_a_r_g_e_t, _d_e_p_e_n_d_e_n_c_y) The specified dependency file(s) will be ignored when deciding if the target file(s) need to be rebuilt. env.Ignore('foo', 'foo.c') env.Ignore('bar', ['bar1.h', 'bar2.h']) Import(_v_a_r_s) env.Import(_v_a_r_s) This tells ssccoonnss to import a list of variables into the current SConscript file. This will import variables that were exported with EExxppoorrtt() or in the _e_x_p_o_r_t_s argument to SSCCoonnssccrriipptt(). Vari- ables exported by SSCCoonnssccrriipptt() have precedence. Multiple vari- able names can be passed to IImmppoorrtt() 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("*") Install(_d_i_r, _s_o_u_r_c_e) env.Install(_d_i_r, _s_o_u_r_c_e) Installs one or more files in a destination directory. The file names remain the same. env.Install(dir = '/usr/local/bin', source = ['foo', 'bar']) InstallAs(_t_a_r_g_e_t, _s_o_u_r_c_e) env.InstallAs(_t_a_r_g_e_t, _s_o_u_r_c_e) Installs one or more files as specific file names, allowing changing a file name as part of the installation. It is an error if the target and source list different numbers of files. env.InstallAs(target = '/usr/local/bin/foo', source = 'foo_debug') env.InstallAs(target = ['../lib/libfoo.a', '../lib/libbar.a'], source = ['libFOO.a', 'libBAR.a']) Literal(_s_t_r_i_n_g) env.Literal(_s_t_r_i_n_g) The specified _s_t_r_i_n_g will be preserved as-is and not have con- struction variables expanded. Local(_t_a_r_g_e_t_s) env.Local(_t_a_r_g_e_t_s) The specified _t_a_r_g_e_t_s 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.ParseConfig(_c_o_m_m_a_n_d, [_f_u_n_c_t_i_o_n, _u_n_i_q_u_e]) Calls the specified _f_u_n_c_t_i_o_n to modify the environment as speci- fied by the output of _c_o_m_m_a_n_d _. The default _f_u_n_c_t_i_o_n expects the output of a typical _*_-_c_o_n_f_i_g _c_o_m_m_a_n_d (for example, ggttkk-- ccoonnffiigg) and adds the options to the appropriate construction variables. By default, duplicate values are not added to any construction variables; you can specify uunniiqquuee==00 to allow dupli- cate values to be added. By default, --LL, --ll, --WWaa, --WWll, --WWpp, --II and other options, are add to the LLIIBBPPAATTHH, LLIIBBSS, AASSFFLLAAGGSS, LLIINNKKFFLLAAGGSS, CCPPPPFFLLAAGGSS, CCPPPPPPAATTHH and CCCCFFLLAAGGSS construction variables, respectively. A returned --pptthhrreeaadd option gets added to both the CCCCFFLLAAGGSS and LLIINNKKFFLLAAGGSS variables. A returned --ffrraammeewwoorrkk option gets added to the LLIINNKK-- FFLLAAGGSS variable. Any other strings not associated with options are assumed to be the names of libraries and added to the LLIIBBSS construction variable. ParseDepends(_f_i_l_e_n_a_m_e, [_m_u_s_t___e_x_i_s_t]) env.ParseDepends(_f_i_l_e_n_a_m_e, [_m_u_s_t___e_x_i_s_t _o_n_l_y___o_n_e]) Parses the contents of the specified _f_i_l_e_n_a_m_e as a list of dependencies in the style of MMaakkee or mmkkddeepp, and explicitly establishes all of the listed dependencies. By default, it is not an error if the specified _f_i_l_e_n_a_m_e does not exist. The optional _m_u_s_t___e_x_i_t 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 _o_n_l_y___o_n_e 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 gener- ated by, for example, the ggcccc --MM flag, which should typically only write dependency information for one output file into a corresponding ..dd file. The _f_i_l_e_n_a_m_e and all of the files listed therein will be inter- preted relative to the directory of the _S_C_o_n_s_c_r_i_p_t file which calls the PPaarrsseeDDeeppeennddss function. env.Perforce() A factory function that returns a Builder object to be used to fetch source files from the Perforce source code management sys- tem. The returned Builder is intended to be passed to the SSoouurrcceeCCooddee function: env.SourceCode('.', env.Perforce()) Perforce uses a number of external environment variables for its operation. Consequently, this function adds the following vari- ables from the user's external environment to the construction environment's ENV dictionary: P4CHARSET, P4CLIENT, P4LANGUAGE, P4PASSWD, P4PORT, P4USER, SYSTEMROOT, USER, and USERNAME. Platform(_s_t_r_i_n_g) Returns a callable object that can be used to initialize a con- struction environment using the platform keyword of the Environ- ment() method: env = Environment(platform = Platform('win32')) env.Platform(_s_t_r_i_n_g) Applies the callable object for the specified platform _s_t_r_i_n_g to the environment through which the method was called. env.Platform('posix') Note that the wwiinn3322 platform adds the SSYYSSTTEEMMRROOOOTT variable from the user's external environment to the construction environ- ment's EENNVV 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 ::ppsseerrvveerr::aannoonnyymmoouuss@@ccvvss..ssoouurrcceeffoorrggee..nneett:://ccvvssrroooott//ssccoonnss) will work on Win32 systems. Precious(_t_a_r_g_e_t, ...) env.Precious(_t_a_r_g_e_t, ...) Marks each given _t_a_r_g_e_t as precious so it is not deleted before it is rebuilt. Normally ssccoonnss deletes a target before building it. Multiple targets can be passed in to a single call to PPrree-- cciioouuss(). env.Prepend(_k_e_y=_v_a_l, [...]) Appends the specified keyword arguments to the beginning of con- struction 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.) env.Prepend(CCFLAGS = '-g ', FOO = ['foo.yyy']) env.PrependENVPath(_n_a_m_e, _n_e_w_p_a_t_h, [_e_n_v_n_a_m_e, _s_e_p]) This appends new path elements to the given path in the speci- fied external environment (EENNVV 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 ooss..ppaatthh..nnoorrmmppaatthh and ooss..ppaatthh..nnoorrmmccaassee). 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. Example: print 'before:',env['ENV']['INCLUDE'] include_path = '/foo/bar:/foo' env.PrependENVPath('INCLUDE', include_path) print 'after:',env['ENV']['INCLUDE'] yields: before: /biz:/foo after: /foo/bar:/foo:/biz env.AppendUnique(_k_e_y=_v_a_l, [...]) Appends the specified keyword arguments to the beginning of con- struction 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 con- struction variable will _n_o_t be added again to the list. env.PrependUnique(CCFLAGS = '-g', FOO = ['foo.yyy']) 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 SSoouurrcceeCCooddee function: env.SourceCode('.', env.RCS()) Note that ssccoonnss 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(_k_e_y=_v_a_l, [...]) Replaces construction variables in the Environment with the specified keyword arguments. env.Replace(CCFLAGS = '-g', FOO = 'foo.xxx') Repository(_d_i_r_e_c_t_o_r_y) env.Repository(_d_i_r_e_c_t_o_r_y) Specifies that _d_i_r_e_c_t_o_r_y is a repository to be searched for files. Multiple calls to RReeppoossiittoorryy() are legal, and each one adds to the list of repositories that will be searched. To ssccoonnss, 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 ssccoonnss, so that the repository contains the necessary sig- nature information to allow ssccoonnss 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, ssccoonnss will _n_o_t make a copy in the local directory tree. In order to guarantee that a local copy will be made, use the LLooccaall(()) method. Return(_v_a_r_s) This tells ssccoonnss what variable(s) to use as the return value(s) of the current SConscript file. These variables will be returned to the "calling" SConscript file as the return value(s) of SSCCoonn-- ssccrriipptt(). Multiple variable names should be passed to RReettuurrnn() as a list. Example: Return("foo") Return(["foo", "bar"]) Scanner(_f_u_n_c_t_i_o_n, [_a_r_g_u_m_e_n_t, _k_e_y_s, _p_a_t_h___f_u_n_c_t_i_o_n, _n_o_d_e___c_l_a_s_s, _n_o_d_e___f_a_c_- _t_o_r_y, _s_c_a_n___c_h_e_c_k, _r_e_c_u_r_s_i_v_e]) env.Scanner(_f_u_n_c_t_i_o_n, [_a_r_g_u_m_e_n_t, _k_e_y_s, _p_a_t_h___f_u_n_c_t_i_o_n, _n_o_d_e___c_l_a_s_s, _n_o_d_e___f_a_c_t_o_r_y, _s_c_a_n___c_h_e_c_k, _r_e_c_u_r_s_i_v_e]) Creates a Scanner object for the specified _f_u_n_c_t_i_o_n. 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 SSoouurrcceeCCooddee function: env.SourceCode('.', env.SCCS()) Note that ssccoonnss 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_._S_C_C_S files in the same directory as the source files, or if you need to explicitly specify SCCS for a specific subdirectory. SConscript(_s_c_r_i_p_t_s, [_e_x_p_o_r_t_s, _b_u_i_l_d___d_i_r, _s_r_c___d_i_r, _d_u_p_l_i_c_a_t_e]) env.SConscript(_s_c_r_i_p_t_s, [_e_x_p_o_r_t_s, _b_u_i_l_d___d_i_r, _s_r_c___d_i_r, _d_u_p_l_i_c_a_t_e]) SConscript(dirs=_s_u_b_d_i_r_s, [name=_s_c_r_i_p_t, _e_x_p_o_r_t_s, _b_u_i_l_d___d_i_r, _s_r_c___d_i_r, _d_u_p_l_i_c_a_t_e]) env.SConscript(dirs=_s_u_b_d_i_r_s, [name=_s_c_r_i_p_t, _e_x_p_o_r_t_s, _b_u_i_l_d___d_i_r, _s_r_c___d_i_r, _d_u_p_l_i_c_a_t_e]) This tells ssccoonnss to execute one or more subsidiary SConscript (configuration) files. There are two ways to call the SSCCoonn-- ssccrriipptt() function. The first way you can call SSCCoonnssccrriipptt() is to explicitly specify one or more _s_c_r_i_p_t_s 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 SSpplliitt()). The second way you can call SSCCoonnssccrriipptt() is to specify a list of (sub)directory names as a dirs=_s_u_b_d_i_r_s keyword argument. In this case, ssccoonnss will, by default, execute a subsidiary configu- ration file named SSCCoonnssccrriipptt in each of the specified directo- ries. You may specify a name other than SSCCoonnssccrriipptt by supplying an optional name=_s_c_r_i_p_t keyword argument. The optional _e_x_p_o_r_t_s argument provides a list of variable names or a dictionary of named values to export to the _s_c_r_i_p_t_(_s_). These variables are locally exported only to the specified _s_c_r_i_p_t_(_s_), and do not affect the global pool of variables used by the EExxppoorrtt() function. The subsidiary _s_c_r_i_p_t_(_s_) must use the IImmppoorrtt() function to import the variables. The optional _b_u_i_l_d___d_i_r argument specifies that all of the target files (for example, object files and executables) that would normally be built in the subdirectory in which _s_c_r_i_p_t resides should actually be built in _b_u_i_l_d___d_i_r. _b_u_i_l_d___d_i_r is interpreted relative to the directory of the calling SConscript file. The optional _s_r_c___d_i_r argument specifies that the source files from which the target files should be built can be found in _s_r_c___d_i_r. _s_r_c___d_i_r is interpreted relative to the directory of the calling SConscript file. By default, ssccoonnss will link or copy (depending on the platform) all the source files into the build directory. This behavior may be disabled by setting the optional _d_u_p_l_i_c_a_t_e argument to 0 (it is set to 1 by default), in which case ssccoonnss will refer directly to the source files in their source directory when building target files. (Setting _d_u_p_l_i_c_a_t_e=0 is usually safe, and always more efficient than the default of _d_u_p_l_i_c_a_t_e=1, but it may cause build problems in certain end-cases, such as com- piling from source files that are generated by the build.) Any variables returned by _s_c_r_i_p_t using RReettuurrnn() will be returned by the call to SSCCoonnssccrriipptt(). Examples: SConscript('subdir/SConscript') foo = SConscript('sub/SConscript', exports='env') SConscript('dir/SConscript', exports=['env', 'variable']) SConscript('src/SConscript', build_dir='build', duplicate=0) SConscript('bld/SConscript', src_dir='src', exports='env variable') SConscript(dirs=['sub1', 'sub2']) SConscript(dirs=['sub3', 'sub4'], name='MySConscript') SConscriptChdir(_v_a_l_u_e) env.SConscriptChdir(_v_a_l_u_e) By default, ssccoonnss 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 ssccoonnss 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 SCon- scriptChdir() multiple times: env = Environment() SConscriptChdir(0) SConscript('foo/SConscript') # will not chdir to foo env.SConscriptChdir(1) SConscript('bar/SConscript') # will chdir to bar SConsignFile([_f_i_l_e,_d_b_m___m_o_d_u_l_e]) env.SConsignFile([_f_i_l_e,_d_b_m___m_o_d_u_l_e]) This tells ssccoonnss to store all file signatures in the specified _f_i_l_e. If the _f_i_l_e is omitted, ..ssccoonnssiiggnn..ddbbmm is used by default. If _f_i_l_e is not an absolute path name, the file is placed in the same directory as the top-level SSCCoonnssttrruucctt file. The optional _d_b_m___m_o_d_u_l_e argument can be used to specify which Python database module The default is to use a custom SSCCoonnss..ddbblliittee module that uses pickled Python data structures, and which works on all Python versions from 1.5.2 on. Examples: # Stores signatures in ".sconsign.dbm" # in the top-level SConstruct directory. 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") 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 not env.has_key('FOO'): env['FOO'] = 'foo' SetOption(_n_a_m_e, _v_a_l_u_e) env.SetOption(_n_a_m_e, _v_a_l_u_e) This function provides a way to set a select subset of the scons command line options from a SConscript file. The options sup- ported are: cclleeaann which corresponds to -c, --clean, and --remove; dduupplliiccaattee which corresponds to --duplicate; iimmpplliicciitt__ccaacchhee which corresponds to --implicit-cache; mmaaxx__ddrriifftt which corresponds to --max-drift; nnuumm__jjoobbss which corresponds to -j and --jobs. See the documentation for the corresponding com- mand line object for information about each specific option. Example: SetOption('max_drift', 1) SideEffect(_s_i_d_e___e_f_f_e_c_t, _t_a_r_g_e_t) env.SideEffect(_s_i_d_e___e_f_f_e_c_t, _t_a_r_g_e_t) Declares _s_i_d_e___e_f_f_e_c_t as a side effect of building _t_a_r_g_e_t. Both _s_i_d_e___e_f_f_e_c_t and _t_a_r_g_e_t can be a list, a file name, or a node. A side effect is a target that is created as a side effect of building other targets. For example, a Windows PDB file is cre- ated as a side effect of building the .obj files for a static library. If a target is a side effect of multiple build com- mands, ssccoonnss will ensure that only one set of commands is exe- cuted 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. SourceCode(_e_n_t_r_i_e_s, _b_u_i_l_d_e_r) env.SourceCode(_e_n_t_r_i_e_s, _b_u_i_l_d_e_r) Arrange for non-existent source files to be fetched from a source code management system using the specified _b_u_i_l_d_e_r. The specified _e_n_t_r_i_e_s 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, ssccoonnss will search up the directory tree and use the first SSoouurrcceeCCooddee builder it finds. The specified _b_u_i_l_d_e_r may be NNoonnee, in which case ssccoonnss will not use a builder to fetch source files for the specified _e_n_t_r_i_e_s, even if a SSoouurrcceeCCooddee builder has been specified for a directory higher up the tree. ssccoonnss will, by default, fetch files from SCCS or RCS subdirecto- ries without explicit configuration. This takes some extra pro- cessing 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 _b_u_i_l_d_e_r is one you create by hand, it must have an associated construction environment to use when fetching a source file. ssccoonnss 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(_t_y_p_e) env.SourceSignatures(_t_y_p_e) This function tells SCons what type of signature to use for source files: MMDD55 or ttiimmeessttaammpp. 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 the signature of a source file is the MD5 checksum of its contents. "timestamp" means the signature of a source file is its timestamp (modification time). There is no differ- ent between the two behaviors for Python VVaalluuee() node objects. "MD5" signatures take longer to compute, but are more accurate than "timestamp" signatures. The default is "MD5". Split(_a_r_g) env.Split(_a_r_g) 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. 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 """) TargetSignatures(_t_y_p_e) env.TargetSignatures(_t_y_p_e) This function tells SCons what type of signatures to use for target files: bbuuiilldd or ccoonntteenntt. If the environment method is used, the specified type of 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. "build" means the signature of a target file is made by concate- nating all of the signatures of all its source files. "content" means the signature of a target file is an MD5 checksum of its contents. "build" signatures are usually faster to compute, but "content" signatures can prevent unnecessary rebuilds when a target file is rebuilt to the exact same contents as the previ- ous build. The default is "build". Tool(_s_t_r_i_n_g[,_t_o_o_l_p_a_t_h, _*_*_k_w]) Returns a callable object that can be used to initialize a con- struction environment using the tools keyword of the Environ- ment() 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 $$TTOOOOLLSS construction variable. Additional keyword arguments are passed to the tool's ggeenneerraattee(()) method. 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 env.Tool(_s_t_r_i_n_g[,_t_o_o_l_p_a_t_h, _*_*_k_w]) Applies the callable object for the specified tool _s_t_r_i_n_g to the environment through which the method was called. Additional keyword arguments are passed to the tool's ggeenneerraattee(()) method. env.Tool('gcc') env.Tool('opengl', toolpath = ['build/tools']) Value(_v_a_l_u_e) env.Value(_v_a_l_u_e) Returns a Node object representing the specified Python value. Value nodes can be used as dependencies of targets. If the result of calling ssttrr((value)) changes between SCons runs, any targets depending on VVaalluuee((value)) will be rebuilt. When using timestamp source signatures, Value nodes' timestamps are equal to the system time when the node is created. def create(target, source, env): f = open(str(target[0]), 'wb') f.write('prefix=' + source[0].get_contents()) prefix = ARGUMENTS.get('prefix', '/usr/local') env = Environment() env['BUILDERS']['Config'] = Builder(action = create) env.Config(target = 'package-config', source = Value(prefix)) WhereIs(_p_r_o_g_r_a_m, [_p_a_t_h, _p_a_t_h_e_x_t, _r_e_j_e_c_t]) env.WhereIs(_p_r_o_g_r_a_m, [_p_a_t_h, _p_a_t_h_e_x_t, _r_e_j_e_c_t]) Searches for the specified executable _p_r_o_g_r_a_m_, returning the full path name to the program if it is found, and returning None if not. Searches the specified _p_a_t_h_, the value of the calling environment's PATH (env['ENV']['PATH']), or the user's current external PATH (os.environ['PATH']) by default. On Win32 sys- tems, searches for executable programs with any of the file extensions listed in the specified _p_a_t_h_e_x_t_, the calling environ- ment'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 _r_e_j_e_c_t list, if any. SSCCoonnssccrriipptt VVaarriiaabblleess In addition to the global functions and methods, ssccoonnss supports a num- ber 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 _k_e_y_w_o_r_d=_v_a_l_u_e arguments specified on the command line. Each element in the list is a tuple containing the (_k_e_y_- _w_o_r_d,_v_a_l_u_e) of the argument. The separate _k_e_y_w_o_r_d and _v_a_l_u_e elements of the tuple can be accessed by subscripting for ele- ment [[00]] and [[11]] of the tuple, respectively. 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 _k_e_y_w_o_r_d=_v_a_l_u_e 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 AARRGGUUMMEENNTTSS dictionary. if ARGUMENTS.get('debug', 0): env = Environment(CCFLAGS = '-g') else: env = Environment() BUILD_TARGETS A list of the targets which ssccoonnss will actually try to build, regardless of whether they were specified on the command line or via the DDeeffaauulltt() function or method. The elements of this list may be strings _o_r nodes, so you should run the list through the Python ssttrr function to make sure any Node path names are con- verted to strings. Because this list may be taken from the list of targets speci- fied using the DDeeffaauulltt() function or method, the contents of the list may change on each successive call to DDeeffaauulltt(). See the DDEEFFAAUULLTT__TTAARRGGEETTSS list, below, for additional information. 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 BBUUIILLDD__TTAARRGGEETTSS list only contains targets expected listed on the command line or via calls to the DDeeffaauulltt() func- tion or method. It does _n_o_t 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: 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 _n_o_d_e_s that have been specified using the DDeeffaauulltt() function or method. The elements of the list are nodes, so you need to run them through the Python ssttrr function to get at the path name for each Node. 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 DDEEFFAAUULLTT__TTAARRGGEETTSS list change on on each suc- cessive call to the DDeeffaauulltt() 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 DDEEFFAAUULLTT__TTAARRGGEETTSS only after you've made all of your DDeeffaauulltt() 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 actu- ally been added to the list. CCoonnssttrruuccttiioonn VVaarriiaabblleess A construction environment has an associated dictionary of _c_o_n_s_t_r_u_c_t_i_o_n _v_a_r_i_a_b_l_e_s that are used by built-in or user-supplied build rules. Con- struction 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 vari- ables can be defined by the user. The following is a list of the auto- matically defined construction variables: AR The static library archiver. 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 assem- bly-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 Bit- Keeper. 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 ggeett 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 $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 com- mand line) is displayed. env = Environment(CCCOMSTR = "Compiling static object $TARGET") CCFLAGS General options that are passed to the C compiler. 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 Win32), SCons also treats _._C (upper case) files as C files. CCVERSION The version number of the C compiler. This may or may not be set, depending on the specific C compiler being used. _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)} $)', CPPDEFINES A platform independent specification of C preprocessor defini- tions. The definitions will be added to command lines through the automatically-generated $_CPPDEFFLAGS construction variable (see below), 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 begin- ning 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 NNoonnee, 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 ssccoonnss 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}) _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 directory in $CPPDEFINES. 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 _n_o_t contain --II (or similar) include search path options that scons generates automatically from $CPPPATH. See __CCPPPPIINNCCFFLLAAGGSS, 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 ssccoonnss 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 DDiirr() func- tion: 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 prepro- cessor implicit dependencies (#include lines). The default list is: [".c", ".C", ".cxx", ".cpp", ".c++", ".cc", ".h", ".H", ".hxx", ".hpp", ".hh", ".F", ".fpp", ".FPP", ".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 reposi- tory. 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. 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 _._c_c. SCons also treats files with the suffixes _._c_p_p, _._c_x_x, _._c_+_+, and _._C_+_+ as C++ files. On case-sensitive systems (Linux, UNIX, and other POSIX- alikes), SCons also treats _._C (upper case) files as C++ files. CXXCOM The command line used to compile a C++ source file to an object file. Any options specified in the $CXXFLAGS and $CPPFLAGS con- struction 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") 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. Dir A function that converts a file name into a Dir instance rela- tive to the target being built. DSUFFIXES The list of suffixes of files that will be scanned for imported D package files. The default list is: ['.d'] DVIPDF The TeX DVI file to PDF file converter. DVIPDFFLAGS General options passed to the TeX DVI file to PDF file con- verter. 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. DVIPS The TeX DVI file to PostScript converter. DVIPSFLAGS General options passed to the TeX DVI file to PostScript con- verter. ENV A dictionary of environment variables to use when invoking com- mands. 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, ssccoonnss does _n_o_t propagate the environment in force when you exe- cute ssccoonnss 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 ssccoonnss is invoked. If you want to propagate your environment variables to the com- mands 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 PPAATTHH environment variable, so that ssccoonnss 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 charac- ters in command lines. The function should take one argument: the command line string to escape; and should return the escaped command line. 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 com- mand 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 $FOR- TRANCOM (the command line) is displayed. F77FLAGS General user-specified options that are passed to the Fortran 77 compiler. Note that this variable does _n_o_t contain --II (or simi- lar) include search path options that scons generates automati- cally from $F77PATH. See __FF7777IINNCCFFLLAAGGSS, 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 directo- ries 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 ssccoonnss to look-up a directory rela- tive to the root of the source tree use #: You only need to set $F77PATH if you need to define a specific include path for For- tran 77 files. You should normally set the $FORTRANPATH vari- able, 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 DDiirr() func- tion: 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 prepro- cessor. 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-pre- processor command line for Fortran 77 files. You should nor- mally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions. 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 com- mand 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 $FOR- TRANCOM (the command line) is displayed. F90FLAGS General user-specified options that are passed to the Fortran 90 compiler. Note that this variable does _n_o_t contain --II (or simi- lar) include search path options that scons generates automatically from $F90PATH. See __FF9900IINNCCFFLLAAGGSS, below, for the variable that expands to those options. You only need to set $F90FLAGS if you need to define specific user options for For- tran 90 files. You should normally set the $FORTRANFLAGS vari- able, 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 directo- ries 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 ssccoonnss to look-up a directory rela- tive to the root of the source tree use #: You only need to set $F90PATH if you need to define a specific include path for For- tran 90 files. You should normally set the $FORTRANPATH vari- able, 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 DDiirr() func- tion: 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 prepro- cessor. 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-pre- processor command line for Fortran 90 files. You should nor- mally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions. 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 com- mand 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 $FOR- TRANCOM (the command line) is displayed. F95FLAGS General user-specified options that are passed to the Fortran 95 compiler. Note that this variable does _n_o_t contain --II (or simi- lar) include search path options that scons generates automati- cally from $F95PATH. See __FF9955IINNCCFFLLAAGGSS, 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 directo- ries 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 ssccoonnss to look-up a directory rela- tive to the root of the source tree use #: You only need to set $F95PATH if you need to define a specific include path for For- tran 95 files. You should normally set the $FORTRANPATH vari- able, 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 DDiirr() func- tion: 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 prepro- cessor. 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-pre- processor command line for Fortran 95 files. You should nor- mally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions. 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 $FORTRAN- FLAGS, $CPPFLAGS, $_CPPDEFFLAGS, $_FORTRANMODFLAG, and $_FOR- TRANINCFLAGS 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. FORTRANFLAGS General user-specified options that are passed to the Fortran compiler. Note that this variable does _n_o_t contain --II (or simi- lar) include or module search path options that scons generates automatically from $FORTRANPATH. See __FFOORRTTRRAANNIINNCCFFLLAAGGSSand__FFOORR-- TTRRAANNMMOODDFFLLAAGGSS,, 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 direc- tory 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 _<_m_o_d_u_l_e___n_a_m_e_>_._m_o_d_. 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 _<_m_o_d_u_l_e___n_a_m_e_>_._m_o_d_. As a result, this variable is set to ".mod", by default. For situa- tions in which the compiler does not necessarily follow the nor- mal 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 directo- ries 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 ssccoonnss to look-up a directory rela- tive to the root of the source tree use #: env = Environment(FORTRANPATH='#/include') The directory look-up can also be forced using the DDiirr() func- tion: 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 $_FOR- TRANINCFLAGS: 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 prepro- cessor. By default, any options specified in the $FORTRANFLAGS, $CPPFLAGS, _CPPDEFFLAGS, $_FORTRANMODFLAG, and $_FORTRANINCFLAGS construction variables are included on this command line. FORTRANSUFFIXES The list of suffixes of files that will be scanned for Fortran implicit dependencies (INCLUDE lines & USE statements). The default list is: [".f", ".F", ".for", ".FOR", ".ftn", ".FTN", ".fpp", ".FPP", ".f77", ".F77", ".f90", ".F90", ".f95", ".F95"] File A function that converts a file name into a File instance rela- tive to the target being built. FRAMEWORKSFLAGS On Mac OS X, frameworks options to be added at the end of a com- mand line building a loadable module. GS The Ghostscript program used to convert PostScript to PDF files. GSFLAGS General options passed to the Ghostscript program when convert- ing PostScript to PDF files. GSCOM The Ghostscript command line used to convert PostScript to PDF files. GSCOMSTR The string displayed when Ghostscript is used to convert a PostScript file to a PDF file. If this is not set, then $GSCOM (the command line) is displayed. 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"] INCPREFIX The prefix used to specify an include directory on the C com- piler 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 com- piler command line. This will be appended to the end of each directory in the $CPPPATH and $FORTRANPATH construction vari- ables 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 desti- nation (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): _d_e_s_t is the path name of the destination file. _s_o_u_r_c_e is the path name of the source file. _e_n_v is the construction environ- ment (a dictionary of construction values) in force for this file installation. 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. JARCHDIR The directory to which the Java archive tool should change (using the --CC option). JARCOM 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") JARFLAGS General options passed to the Java archive tool. By default this is set to ccff to create the necessary _j_a_r file. JARSUFFIX The suffix for Java archives: ..jjaarr by default. 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 JJaavvaaHH builder. JAVACLASSSUFFIX The suffix for Java class files; ..ccllaassss 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 con- struction 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 com- mand 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. JAVASUFFIX The suffix for Java files; ..jjaavvaa by default. 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. 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. LDMODULEPREFIX The prefix used for loadable module file names. On Mac OS X, this is null; on other systems, this is the same as $SHLIBPRE- FIX. 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. LEX The lexical analyzer generator. LEXFLAGS General options passed to 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") _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 $_LIB- DIRFLAGS 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 direc- tory in the $LIBPATH construction variable when the $_LIB- DIRFLAGS variable is automatically generated. _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 com- mand 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 com- mand 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 argu- ments 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 ssccoonnss to look-up a directory rela- tive to the root of the source tree use #: env = Environment(LIBPATH='#/libs') The directory look-up can also be forced using the DDiirr() func- tion: 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 $LIBDIRPRE- FIX 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 An array of legal prefixes for library file names. 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 An array of legal suffixes for library file names. LINK The linker. LINKFLAGS General user options passed to the linker. Note that this vari- able should _n_o_t contain --ll (or similar) options for linking with the libraries listed in $LIBS, nor --LL (or similar) library search path options that scons generates automatically from $LIBPATH. See __LLIIBBFFLLAAGGSS, above, for the variable that expands to library-link options, and __LLIIBBDDIIRRFFLLAAGGSS, above, for the vari- able that expands to library search path options. LINKCOM The command line used to link object files into an executable. LINKCOMSTR The string displayed when object files are linked into an exe- cutable. If this is not set, then $LINKCOM (the command line) is displayed. env = Environment(LINKCOMSTR = "Linking $TARGET") M4 The M4 macro preprocessor. M4FLAGS General options passed to the M4 macro preprocessor. M4COM The command line used to pass files through the M4 macro prepro- cessor. 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. MAXLINELENGTH The maximum number of characters allowed on an external command line. On Win32 systems, link lines longer than this many char- acters are linke via a temporary file name. MSVS When the Microsoft Visual Studio tools are initialized, they set up this dictionary with the following keys: VVEERRSSIIOONN:: the version of MSVS being used (can be set via MSVS_VERSION) VVEERRSSIIOONNSS:: the available versions of MSVS installed VVCCIINNSSTTAALLLLDDIIRR:: installed directory of Visual C++ VVSSIINNSSTTAALLLLDDIIRR:: installed directory of Visual Studio FFRRAAMMEEWWOORRKKDDIIRR:: installed directory of the .NET framework FFRRAAMMEEWWOORRKKVVEERRSSIIOONNSS:: list of installed versions of the .NET frame- work, sorted latest to oldest. FFRRAAMMEEWWOORRKKVVEERRSSIIOONN:: latest installed version of the .NET framework FFRRAAMMEEWWOORRKKSSDDKKDDIIRR:: installed location of the .NET SDK. PPLLAATTFFOORRMMSSDDKKDDIIRR:: installed location of the Platform SDK. PPLLAATTFFOORRMMSSDDKK__MMOODDUULLEESS:: dictionary of installed Platform SDK mod- ules, 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_IGNORE_IDE_PATHS Tells the MS Visual Studio tools to use minimal INCLUDE, LIB, and PATH settings, instead of the settings from the IDE. For Visual Studio, SCons will (by default) automatically deter- mine where MSVS is installed, and use the LIB, INCLUDE, and PATH variables set by the IDE. You can override this behavior by setting these variables after Environment initialization, or by setting MMSSVVSS__IIGGNNOORREE__IIDDEE__PPAATTHHSS == 11 in the Environment initializa- tion. Specifying this will not leave these unset, but will set them to a minimal set of paths needed to run the tools success- fully. For VS6, the mininimal set is: INCLUDE:'\VC98\ATL\include;\VC98\MFC\include;\VC98\include' LIB:'\VC98\MFC\lib;\VC98\lib' PATH:'\Common\MSDev98\bin;\VC98\bin' For VS7, it is: INCLUDE:'\Vc7\atlmfc\include;\Vc7\include' LIB:'\Vc7\atlmfc\lib;\Vc7\lib' PATH:'\Common7\Tools\bin;\Common7\Tools;\Vc7\bin' Where '' is the installed location of Visual Studio. MSVS_USE_MFC_DIRS Tells the MS Visual Studio tool(s) to use the MFC directories in its default paths for compiling and linking. Under MSVS version 6, setting MMSSVVSS__UUSSEE__MMFFCC__DDIIRRSS to a non-zero value adds the AATTLL\\iinncclluuddee and MMFFCC\\iinncclluuddee directories to the default IINNCCLLUUDDEE external environment variable, and adds the MMFFCC\\lliibb directory to the default LLIIBB external environment variable. Under MSVS ver- sion 7, setting MMSSVVSS__UUSSEE__MMFFCC__DDIIRRSS to a non-zero value adds the aattllmmffcc\\iinncclluuddee directory to the default IINNCCLLUUDDEE external envi- ronment variable, and adds the aattllmmffcc\\lliibb directory to the default LLIIBB external environment variable. The current default value is 11, which means these directories are added to the paths by default. This default value is likely to change in a future release, so users who want the ATL and MFC values included in their paths are encouraged to enable the MMSSVVSS__UUSSEE__MMFFCC__DDIIRRSS value explicitly to avoid future incompatibility. This variable has no effect if the IINNCCLLUUDDEE or LLIIBB environment variables are set explictly. MSVS_VERSION Sets the preferred version of MSVS to use. SCons will (by default) select the latest version of MSVS installed on your machine. So, if you have version 6 and ver- sion 7 (MSVS .NET) installed, it will prefer version 7. You can override this by specifying the MMSSVVSS__VVEERRSSIIOONN variable in the Environment initialization, setting it to the appropriate ver- sion ('6.0' or '7.0', for example). If the given version isn't installed, tool initialization will fail. MSVSPROJECTCOM The action used to generate Microsoft Visual Studio project and solution files. MSVSPROJECTSUFFIX The suffix used for Microsoft Visual Studio project (DSP) files. The default value is ..vvccpprroojj when using Visual Studio version 7.x (.NET), and ..ddsspp when using earlier versions of Visual Stu- dio. MSVSSOLUTIONSUFFIX The suffix used for Microsoft Visual Studio solution (DSW) files. The default value is ..ssllnn when using Visual Studio ver- sion 7.x (.NET), and ..ddssww when using earlier versions of Visual Studio. 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. no_import_lib When set to non-zero, suppresses creation of a corresponding Win32 static import lib by the SShhaarreeddLLiibbrraarryy builder when used with MinGW or Microsoft Visual Studio. 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. 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 depen- dencies for the PCH file. Example: env['PCH'] = 'StdAfx.pch' PCHCOM The command line used by the PPCCHH builder to generated a precom- piled header. PCHCOMSTR The string displayed when generating a precompiled header. If this is not set, then $PCHCOM (the command line) is displayed. PCHSTOP This variable specifies how much of a source file is precom- piled. This variable is ignored by tools other than Microsoft Visual C++, or when the PCH variable is not being used. When this variable is define it must be a string that is the name of the header that is included at the end of the precompiled por- tion of the source files, or the empty string if the "#pragma hrdstop" construct is being used: env['PCHSTOP'] = 'StdAfx.h' PDB The Microsoft Visual C++ PDB file that will store debugging information for object files, shared libraries, and programs. This variable is ignored by tools other than Microsoft Visual C++. When this variable is defined SCons will add options to the compiler and linker command line to cause them to generate external debugging information, and will also set up the depen- dencies for the PDB file. Example: env['PDB'] = 'hello.pdb' PDFCOM A deprecated synonym for $DVIPDFCOM. PDFPREFIX The prefix used for PDF file names. PDFSUFFIX The suffix used for PDF file names. PLATFORM The name of the platform used to create the Environment. If no platform is specified when the Environment is created, SSCCoonnss autodetects the platform. env = Environment(tools = []) if env['PLATFORM'] == 'cygwin': Tool('mingw')(env) else: Tool('msvc')(env) PRINT_CMD_LINE_FUNC A Python function used to print the command lines as they are executed (assuming command printing is not disabled by the --qq or --ss options or their equivalents). The function should take four arguments: _s, the command being executed (a string), _t_a_r_g_e_t, the target being built (file node, list, or string name(s)), _s_o_u_r_c_e, the source(s) used (file node, list, or string name(s)), and _e_n_v, the environment being used. The function must do the printing itself. The default implemen- tation, used if this variable is not set or is None, is: def print_cmd_line(s, target, source, env): sys.stdout.write(s + "0) Here's an example of a more interesting function: def print_cmd_line(s, target, source, env): sys.stdout.write("Building %s -> %s...0 % (' and '.join([str(x) for x in source]), ' and '.join([str(x) for x in target]))) env=Environment(PRINT_CMD_LINE_FUNC=print_cmd_line) env.Program('foo', 'foo.c') This just prints "Building from ..." instead of the actual commands. Such a function could also log the actual com- mands to a log file, for example. PROGPREFIX The prefix used for executable file names. PROGSUFFIX The suffix used for executable file names. PSCOM The command line used to convert TeX DVI files into a PostScript file. PSCOMSTR The string displayed when a TeX DVI file is converted into a PostScript file. If this is not set, then $PSCOM (the command line) is displayed. PSPREFIX The prefix used for PostScript file names. PSSUFFIX The prefix used for PostScript file names. QTDIR The qt tool tries to take this from os.environ. It also ini- tializes all QT_* construction variables listed below. (Note that all paths are constructed with python's os.path.join() method, but are listed here with the '/' separator for easier reading.) In addition, the construction environment variables CPPPATH, LIBPATH and LIBS may be modified and the variables PRO- GEMITTER, SHLIBEMITTER and LIBEMITTER are modified. Because the build-performance is affected when using this tool, you have to explicitly specify it at Environment creation: Environment(tools=['default','qt']) The qt tool supports the following operations: AAuuttoommaattiicc mmoocc ffiillee ggeenneerraattiioonn ffrroomm hheeaaddeerr ffiilleess.. You do not have to specify moc files explicitly, the tool does it for you. However, there are a few preconditions to do so: Your header file must have the same filebase as your implementation file and must stay in the same directory. It must have one of the suf- fixes .h, .hpp, .H, .hxx, .hh. You can turn off automatic moc file generation by setting QT_AUTOSCAN to 0. See also the cor- responding builder method MMoocc(()) AAuuttoommaattiicc mmoocc ffiillee ggeenneerraattiioonn ffrroomm ccxxxx ffiilleess.. As stated in the qt documentation, include the moc file at the end of the cxx file. Note that you have to include the file, which is generated by the transformation ${QT_MOCCXXPREFIX}${QT_MOC- CXXSUFFIX}, by default .moc. A warning is generated after building the moc file, if you do not include the correct file. If you are using BuildDir, you may need to specify dupli- cate=1. You can turn off automatic moc file generation by set- ting QT_AUTOSCAN to 0. See also the corresponding builder method MMoocc(()) AAuuttoommaattiicc hhaannddlliinngg ooff ..uuii ffiilleess.. The implementation files gen- erated from .ui files are handled much the same as yacc or lex files. Each .ui file given as a source of Program, Library or SharedLibrary will generate three files, the declaration file, the implementation file and a moc file. Because there are also generated headers, you may need to specify duplicate=1 in calls to BuildDir. See also the corresponding builder method UUiicc(()) QT_AUTOSCAN Turn off scanning for mocable files. Use the Moc Builder to explicitely specify files to run moc on. QT_BINPATH The path where the qt binaries are installed. The default value is '$QTDIR/bin'. QT_CPPPATH The path where the qt header files are installed. The default value is '$QTDIR/include'. Note: If you set this variable to None, the tool won't change the CPPPATH construction variable. QT_DEBUG Prints lots of debugging information while scanning for moc files. QT_LIBPATH The path where the qt libraries are installed. The default value is '$QTDIR/lib'. Note: If you set this variable to None, the tool won't change the LIBPATH construction variable. QT_LIB Default value is 'qt'. You may want to set this to 'qt-mt'. Note: If you set this variable to None, the tool won't change the LIBS variable. QT_MOC Default value is '$QT_BINPATH/moc'. QT_MOCCXXPREFIX Default value is ''. Prefix for moc output files, when source is a cxx file. QT_MOCCXXSUFFIX Default value is '.moc'. Suffix for moc output files, when source is a cxx file. QT_MOCFROMCPPFLAGS Default value is '-i'. These flags are passed to moc, when mocc- ing a cpp file. QT_MOCFROMCXXCOM Command to generate a moc file from a cpp file. QT_MOCFROMCXXCOMSTR The string displayed when generating a moc file from a cpp file. If this is not set, then $QT_MOCFROMCXXCOM (the command line) is displayed. QT_MOCFROMHCOM Command to generate a moc file from a header. QT_MOCFROMHCOMSTR The string displayed when generating a moc file from a cpp file. If this is not set, then $QT_MOCFROMHCOM (the command line) is displayed. QT_MOCFROMHFLAGS Default value is ''. These flags are passed to moc, when moccing a header file. QT_MOCHPREFIX Default value is 'moc_'. Prefix for moc output files, when source is a header. QT_MOCHSUFFIX Default value is '$CXXFILESUFFIX'. Suffix for moc output files, when source is a header. QT_UIC Default value is '$QT_BINPATH/uic'. QT_UICCOM Command to generate header files from .ui files. QT_UICCOMSTR The string displayed when generating header files from .ui files. If this is not set, then $QT_UICCOM (the command line) is displayed. QT_UICDECLFLAGS Default value is ''. These flags are passed to uic, when creat- ing a a h file from a .ui file. QT_UICDECLPREFIX Default value is ''. Prefix for uic generated header files. QT_UICDECLSUFFIX Default value is '.h'. Suffix for uic generated header files. QT_UICIMPLFLAGS Default value is ''. These flags are passed to uic, when creat- ing a cxx file from a .ui file. QT_UICIMPLPREFIX Default value is 'uic_'. Prefix for uic generated implementation files. QT_UICIMPLSUFFIX Default value is '$CXXFILESUFFIX'. Suffix for uic generated implementation files. QT_UISUFFIX Default value is '.ui'. Suffix of designer input files. RANLIB The archive indexer. RANLIBFLAGS General options passed to the archive indexer. RC The resource compiler used by the RES builder. RCCOM The command line used by the RES builder. RCCOMSTR The string displayed when invoking the resource compiler. If this is not set, then $RCCOM (the command line) is displayed. RCFLAGS The flags passed to the resource compiler by the RES builder. RCS The RCS executable. Note that this variable is not actually used for the command to fetch source files from RCS; see the RRCCSS__CCOO construction variable, below. RCS_CO The RCS "checkout" executable, used to fetch source files from RCS. RCS_COCOM The command line used to fetch (checkout) source files from RCS. RCS_COCOMSTR The string displayed when fetching a source file from RCS. If this is not set, then $RCS_COCOM (the command line) is dis- played. RCS_COFLAGS Options that are passed to the $RCS_CO command. REGSVR The program used to register DLLs on Windows systems. REGSVRCOM The command line used to register a newly-built DLL file on Win- dows systems. Invoked when the "register=1" keyword argument is passed to the SShhaarreeddLLiibbrraarryy Builder. REGSVRCOMSTR The string displayed when registering a newly-built DLL file. If this is not set, then $REGSVRCOM (the command line) is dis- played. RDirs A function that converts a file name into a list of Dir instances by searching the repositories. RMIC The Java RMI stub compiler. RMICCOM The command line used to compile stub and skeleton class files from Java classes that contain RMI implementations. Any options specified in the $RMICFLAGS construction variable are included on this command line. RMICCOMSTR The string displayed when compiling stub and skeleton class files from Java classes that contain RMI implementations. If this is not set, then $RMICCOM (the command line) is displayed. env = Environment(RMICCOMSTR = "Generating stub/skeleton class files $TARGETS from $SOURCES") RMICFLAGS General options passed to the Java RMI stub compiler. RPCGEN The RPC protocol compiler. RPCGENCLIENTFLAGS Options passed to the RPC protocol compiler when generating client side stubs. These are in addition to any flags specified in the RRPPCCGGEENNFFLLAAGGSS construction variable. RPCGENFLAGS General options passed to the RPC protocol compiler. RPCGENHEADERFLAGS Options passed to the RPC protocol compiler when generating a header file. These are in addition to any flags specified in the RRPPCCGGEENNFFLLAAGGSS construction variable. RPCGENSERVICEFLAGS Options passed to the RPC protocol compiler when generating server side stubs. These are in addition to any flags specified in the RRPPCCGGEENNFFLLAAGGSS construction variable. RPCGENXDRFLAGS Options passed to the RPC protocol compiler when generating XDR routines. These are in addition to any flags specified in the RRPPCCGGEENNFFLLAAGGSS construction variable. RPATH A list of paths to search for shared libraries when running pro- grams. Currently only used in the GNU linker (gnulink) and IRIX linker (sgilink). Ignored on platforms and toolchains that don't support it. Note that the paths added to RPATH are not transformed by ssccoonnss in any way: if you want an absolute path, you must make it absolute yourself. SCANNERS A list of the available implicit dependency scanners. New file scanners may be added by appending to this list, although the more flexible approach is to associate scanners with a specific Builder. See the sections "Builder Objects" and "Scanner Objects," below, for more information. SCCS The SCCS executable. SCCSCOM The command line used to fetch source files from SCCS. SCCSCOMSTR The string displayed when fetching a source file from a CVS repository. If this is not set, then $SCCSCOM (the command line) is displayed. SCCSFLAGS General options that are passed to SCCS. SCCSGETFLAGS Options that are passed specifically to the SCCS "get" subcom- mand. This can be set, for example, to _-_e to check out editable files from SCCS. SHCC The C compiler used for generating shared-library objects. SHCCCOM The command line used to compile a C source file to a shared- library object file. Any options specified in the $SHCCFLAGS and $CPPFLAGS construction variables are included on this com- mand line. SHCCCOMSTR The string displayed when a C source file is compiled to a shared object file. If this is not set, then $SHCCCOM (the com- mand line) is displayed. env = Environment(SHCCCOMSTR = "Compiling shared object $TARGET") SHCCFLAGS Options that are passed to the C compiler to generate shared- library objects. SHCXX The C++ compiler used for generating shared-library objects. SHCXXCOM The command line used to compile a C++ source file to a shared- library object file. Any options specified in the $SHCXXFLAGS and $CPPFLAGS construction variables are included on this com- mand line. SHCXXCOMSTR The string displayed when a C++ source file is compiled to a shared object file. If this is not set, then $SHCXXCOM (the command line) is displayed. env = Environment(SHCXXCOMSTR = "Compiling shared object $TARGET") SHCXXFLAGS Options that are passed to the C++ compiler to generate shared- library objects. SHELL A string naming the shell program that will be passed to the _S_P_A_W_N function. See the _S_P_A_W_N construction variable for more information. SHF77 The Fortran 77 compiler used for generating shared-library objects. You should normally set the $SHFORTRANC variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $SHF77 if you need to use a spe- cific compiler or compiler version for Fortran 77 files. SHF77COM The command line used to compile a Fortran 77 source file to a shared-library object file. You only need to set $SHF77COM if you need to use a specific command line for Fortran 77 files. You should normally set the $SHFORTRANCOM variable, which speci- fies the default command line for all Fortran versions. SHF77COMSTR The string displayed when a Fortran 77 source file is compiled to a shared-library object file. If this is not set, then $SHF77COM or $SHFORTRANCOM (the command line) is displayed. SHF77FLAGS Options that are passed to the Fortran 77 compiler to generated shared-library objects. You only need to set $SHF77FLAGS if you need to define specific user options for Fortran 77 files. You should normally set the $SHFORTRANFLAGS variable, which speci- fies the user-specified options passed to the default Fortran compiler for all Fortran versions. SHF77PPCOM The command line used to compile a Fortran 77 source file to a shared-library object file after first running the file through the C preprocessor. Any options specified in the $SHF77FLAGS and $CPPFLAGS construction variables are included on this com- mand line. You only need to set $SHF77PPCOM if you need to use a specific C-preprocessor command line for Fortran 77 files. You should normally set the $SHFORTRANPPCOM variable, which specifies the default C-preprocessor command line for all For- tran versions. SHF90 The Fortran 90 compiler used for generating shared-library objects. You should normally set the $SHFORTRANC variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $SHF90 if you need to use a spe- cific compiler or compiler version for Fortran 90 files. SHF90COM The command line used to compile a Fortran 90 source file to a shared-library object file. You only need to set $SHF90COM if you need to use a specific command line for Fortran 90 files. You should normally set the $SHFORTRANCOM variable, which speci- fies the default command line for all Fortran versions. SHF90COMSTR The string displayed when a Fortran 90 source file is compiled to a shared-library object file. If this is not set, then $SHF90COM or $SHFORTRANCOM (the command line) is displayed. SHF90FLAGS Options that are passed to the Fortran 90 compiler to generated shared-library objects. You only need to set $SHF90FLAGS if you need to define specific user options for Fortran 90 files. You should normally set the $SHFORTRANFLAGS variable, which speci- fies the user-specified options passed to the default Fortran compiler for all Fortran versions. SHF90PPCOM The command line used to compile a Fortran 90 source file to a shared-library object file after first running the file through the C preprocessor. Any options specified in the $SHF90FLAGS and $CPPFLAGS construction variables are included on this com- mand line. You only need to set $SHF90PPCOM if you need to use a specific C-preprocessor command line for Fortran 90 files. You should normally set the $SHFORTRANPPCOM variable, which specifies the default C-preprocessor command line for all For- tran versions. SHF95 The Fortran 95 compiler used for generating shared-library objects. You should normally set the $SHFORTRANC variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $SHF95 if you need to use a spe- cific compiler or compiler version for Fortran 95 files. SHF95COM The command line used to compile a Fortran 95 source file to a shared-library object file. You only need to set $SHF95COM if you need to use a specific command line for Fortran 95 files. You should normally set the $SHFORTRANCOM variable, which speci- fies the default command line for all Fortran versions. SHF95COMSTR The string displayed when a Fortran 95 source file is compiled to a shared-library object file. If this is not set, then $SHF95COM or $SHFORTRANCOM (the command line) is displayed. SHF95FLAGS Options that are passed to the Fortran 95 compiler to generated shared-library objects. You only need to set $SHF95FLAGS if you need to define specific user options for Fortran 95 files. You should normally set the $SHFORTRANFLAGS variable, which speci- fies the user-specified options passed to the default Fortran compiler for all Fortran versions. SHF95PPCOM The command line used to compile a Fortran 95 source file to a shared-library object file after first running the file through the C preprocessor. Any options specified in the $SHF95FLAGS and $CPPFLAGS construction variables are included on this com- mand line. You only need to set $SHF95PPCOM if you need to use a specific C-preprocessor command line for Fortran 95 files. You should normally set the $SHFORTRANPPCOM variable, which specifies the default C-preprocessor command line for all For- tran versions. SHFORTRAN The default Fortran compiler used for generating shared-library objects. SHFORTRANCOM The command line used to compile a Fortran source file to a shared-library object file. FORTRANCOMSTR The string displayed when a Fortran source file is compiled to a shared-library object file. If this is not set, then $SHFOR- TRANCOM (the command line) is displayed. SHFORTRANFLAGS Options that are passed to the Fortran compiler to generate shared-library objects. SHFORTRANPPCOM The command line used to compile a Fortran source file to a shared-library object file after first running the file through the C preprocessor. Any options specified in the $SHFORTRAN- FLAGS and $CPPFLAGS construction variables are included on this command line. SHLIBPREFIX The prefix used for shared library file names. SHLIBSUFFIX The suffix used for shared library file names. SHLINK The linker for programs that use shared libraries. SHLINKCOM The command line used to link programs using shared libaries. SHLINKCOMSTR The string displayed when programs using shared libraries are linked. If this is not set, then $SHLINKCOM (the command line) is displayed. env = Environment(SHLINKCOMSTR = "Linking shared $TARGET") SHLINKFLAGS General user options passed to the linker for programs using shared libraries. Note that this variable should _n_o_t contain --ll (or similar) options for linking with the libraries listed in $LIBS, nor --LL (or similar) include search path options that scons generates automatically from $LIBPATH. See __LLIIBBFFLLAAGGSS, above, for the variable that expands to library-link options, and __LLIIBBDDIIRRFFLLAAGGSS, above, for the variable that expands to library search path options. SHOBJPREFIX The prefix used for shared object file names. SHOBJSUFFIX The suffix used for shared object file names. SOURCE A reserved variable name that may not be set or used in a con- struction environment. (See "Variable Substitution," below.) SOURCES A reserved variable name that may not be set or used in a con- struction environment. (See "Variable Substitution," below.) SPAWN A command interpreter function that will be called to execute command line strings. The function must expect the following arguments: def spawn(shell, escape, cmd, args, env): _s_h is a string naming the shell program to use. _e_s_c_a_p_e is a function that can be called to escape shell special characters in the command line. _c_m_d is the path to the command to be executed. _a_r_g_s is the arguments to the command. _e_n_v is a dic- tionary of the environment variables in which the command should be executed. SWIG The scripting language wrapper and interface generator. SWIGCFILESUFFIX The suffix that will be used for intermediate C source files generated by the scripting language wrapper and interface gener- ator. The default value is __wwrraapp$$CCFFIILLEESSUUFFFFIIXX. By default, this value is used whenever the --cc++++ option is _n_o_t specified as part of the SSWWIIGGFFLLAAGGSS construction variable. SWIGCOM The command line used to call the scripting language wrapper and interface generator. SWIGCOMSTR The string displayed when calling the scripting language wrapper and interface generator. If this is not set, then $SWIGCOM (the command line) is displayed. SWIGCXXFILESUFFIX The suffix that will be used for intermediate C++ source files generated by the scripting language wrapper and interface gener- ator. The default value is __wwrraapp$$CCFFIILLEESSUUFFFFIIXX. By default, this value is used whenever the --cc++++ option is specified as part of the SSWWIIGGFFLLAAGGSS construction variable. SWIGFLAGS General options passed to the scripting language wrapper and interface generator. This is where you should set --ppyytthhoonn, --ppeerrll55, --ttccll, or whatever other options you want to specify to SWIG. If you set the --cc++++ option in this variable, ssccoonnss will, by default, generate a C++ intermediate source file with the extension that is specified as the $$CCXXXXFFIILLEESSUUFFFFIIXX variable. TAR The tar archiver. TARCOM The command line used to call the tar archiver. TARCOMSTR The string displayed when archiving files using the tar archiver. If this is not set, then $TARCOM (the command line) is displayed. env = Environment(TARCOMSTR = "Archiving $TARGET") TARFLAGS General options passed to the tar archiver. TARGET A reserved variable name that may not be set or used in a con- struction environment. (See "Variable Substitution," below.) TARGETS A reserved variable name that may not be set or used in a con- struction environment. (See "Variable Substitution," below.) TARSUFFIX The suffix used for tar file names. TEX The TeX formatter and typesetter. TEXCOM The command line used to call the TeX formatter and typesetter. TEXCOMSTR The string displayed when calling the TeX formatter and typeset- ter. If this is not set, then $TEXCOM (the command line) is displayed. env = Environment(TEXCOMSTR = "Building $TARGET from TeX input $SOURCES") TEXFLAGS General options passed to the TeX formatter and typesetter. TOOLS A list of the names of the Tool specifications that are part of this construction environment. WIN32_INSERT_DEF When this is set to true, a library build of a WIN32 shared library (.dll file) will also build a corresponding .def file at the same time, if a .def file is not already listed as a build target. The default is 0 (do not build a .def file). WIN32DEFPREFIX The prefix used for WIN32 .def file names. WIN32DEFSUFFIX The suffix used for WIN32 .def file names. YACC The parser generator. YACCCOM The command line used to call the parser generator to generate a source file. YACCCOMSTR The string displayed when generating a source file using the parser generator. If this is not set, then $YACCCOM (the com- mand line) is displayed. env = Environment(YACCCOMSTR = "Yacc'ing $TARGET from $SOURCES") YACCFLAGS General options passed to the parser generator. If $YACCFLAGS contains a -d option, SCons assumes that the call will also cre- ate a .h file (if the yacc source file ends in a .y suffix) or a .hpp file (if the yacc source file ends in a .yy suffix) ZIP The zip compression and file packaging utility. ZIPCOM The command line used to call the zip utility, or the internal Python function used to create a zip archive. ZIPCOMSTR The string displayed when archiving files using the zip utility. If this is not set, then $ZIPCOM (the command line or internal Python function) is displayed. env = Environment(ZIPCOMSTR = "Zipping $TARGET") ZIPCOMPRESSION The _c_o_m_p_r_e_s_s_i_o_n flag from the Python zziippffiillee module used by the internal Python function to control whether the zip archive is compressed or not. The default value is zziippffiillee..ZZIIPP__DDEEFFLLAATTEEDD, which creates a compressed zip archive. This value has no effect when using Python 1.5.2 or if the zziippffiillee module is oth- erwise unavailable. ZIPFLAGS General options passed to the zip utility. Construction variables can be retrieved and set using the DDiiccttiioonnaarryy method of the construction environment: dict = env.Dictionary() dict["CC"] = "cc" or using the [] operator: env["CC"] = "cc" Construction variables can also be passed to the construction environ- ment constructor: env = Environment(CC="cc") or when copying a construction environment using the CCooppyy method: env2 = env.Copy(CC="cl.exe") CCoonnffiigguurree CCoonntteexxttss ssccoonnss supports _c_o_n_f_i_g_u_r_e _c_o_n_t_e_x_t_s_, an integrated mechanism similar to the various AC_CHECK macros in GNU autoconf for testing for the existence of C header files, libraries, etc. In contrast to autoconf, ssccoonnss does not maintain an explicit cache of the tested values, but uses its normal dependency tracking to keep the checked values up to date. However, users may override this behaviour with the ----ccoonnffiigg com- mand line option. The following methods can be used to perform checks: Configure(_e_n_v, [_c_u_s_t_o_m___t_e_s_t_s, _c_o_n_f___d_i_r, _l_o_g___f_i_l_e, _c_o_n_f_i_g___h]) env.Configure([_c_u_s_t_o_m___t_e_s_t_s, _c_o_n_f___d_i_r, _l_o_g___f_i_l_e, _c_o_n_f_i_g___h]) This creates a configure context, which can be used to perform checks. _e_n_v specifies the environment for building the tests. This environment may be modified when performing checks. _c_u_s_- _t_o_m___t_e_s_t_s is a dictionary containing custom tests. See also the section about custom tests below. By default, no custom tests are added to the configure context. _c_o_n_f___d_i_r specifies a direc- tory where the test cases are built. Note that this directory is not used for building normal targets. The default value is the directory #/.sconf_temp. _l_o_g___f_i_l_e specifies a file which collects the output from commands that are executed to check for the existence of header files, libraries, etc. The default is the file #/config.log. If you are using the BBuuiillddDDiirr method, you may want to specify a subdirectory under your build direc- tory. _c_o_n_f_i_g___h specifies a C header file where the results of tests will be written, e.g. #define HAVE_STDIO_H, #define HAVE_LIBM, etc. The default is to not write a ccoonnffiigg..hh file. You can specify the same ccoonnffiigg..hh file in multiple calls to Con- figure, in which case ssccoonnss will concatenate all results in the specified file. Note that SCons uses its normal dependency checking to decide if it's necessary to rebuild the specified _c_o_n_f_i_g___h file. This means that the file is not necessarily re- built each time scons is run, but is only rebuilt if its con- tents will have changed and some target that depends on the _c_o_n_- _f_i_g___h file is being built. A created CCoonnffiigguurree instance has the following associated methods: Configure.Finish(_s_e_l_f) This method should be called after configuration is done. It returns the environment as modified by the configuration checks performed. After this method is called, no further checks can be performed with this configuration context. However, you can create a new Configure context to perform additional checks. Only one context should be active at a time. The following Checks are predefined. (This list will likely grow larger as time goes by and developers contribute new useful tests.) Configure.CheckHeader(_s_e_l_f, _h_e_a_d_e_r, [_i_n_c_l_u_d_e___q_u_o_t_e_s, _l_a_n_g_u_a_g_e]) Checks if _h_e_a_d_e_r is usable in the specified language. _h_e_a_d_e_r may be a list, in which case the last item in the list is the header file to be checked, and the previous list items are header files whose ##iinncclluuddee lines should precede the header line being checked for. The optional argument _i_n_c_l_u_d_e___q_u_o_t_e_s must be a two character string, where the first character denotes the opening quote and the second character denotes the closing quote. By default, both characters are " (double quote). The optional argument _l_a_n_g_u_a_g_e should be either CC or CC++++ and selects the compiler to be used for the check. Returns 1 on success and 0 on failure. Configure.CheckCHeader(_s_e_l_f, _h_e_a_d_e_r, [_i_n_c_l_u_d_e___q_u_o_t_e_s]) This is a wrapper around CCoonnffiigguurree..CChheecckkHHeeaaddeerr which checks if _h_e_a_d_e_r is usable in the C language. _h_e_a_d_e_r may be a list, in which case the last item in the list is the header file to be checked, and the previous list items are header files whose ##iinncclluuddee lines should precede the header line being checked for. The optional argument _i_n_c_l_u_d_e___q_u_o_t_e_s must be a two character string, where the first character denotes the opening quote and the second character denotes the closing quote (both default to "). Returns 1 on success and 0 on failure. Configure.CheckCXXHeader(_s_e_l_f, _h_e_a_d_e_r, [_i_n_c_l_u_d_e___q_u_o_t_e_s]) This is a wrapper around CCoonnffiigguurree..CChheecckkHHeeaaddeerr which checks if _h_e_a_d_e_r is usable in the C++ language. _h_e_a_d_e_r may be a list, in which case the last item in the list is the header file to be checked, and the previous list items are header files whose ##iinncclluuddee lines should precede the header line being checked for. The optional argument _i_n_c_l_u_d_e___q_u_o_t_e_s must be a two character string, where the first character denotes the opening quote and the second character denotes the closing quote (both default to "). Returns 1 on success and 0 on failure. Configure.CheckFunc(_s_e_l_f, _f_u_n_c_t_i_o_n___n_a_m_e, [_h_e_a_d_e_r, _l_a_n_g_u_a_g_e]) Checks if the specified C or C++ function is available. _f_u_n_c_- _t_i_o_n___n_a_m_e is the name of the function to check for. The optional _h_e_a_d_e_r argument is a string that will be placed at the top of the test file that will be compiled to check if the func- tion exists; the default is: #ifdef __cplusplus extern "C" #endif char function_name(); The optional _l_a_n_g_u_a_g_e argument should be CC or CC++++ and selects the com- piler to be used for the check; the default is "C". Configure.CheckLib(_s_e_l_f, [_l_i_b_r_a_r_y, _s_y_m_b_o_l, _h_e_a_d_e_r, _l_a_n_g_u_a_g_e, _a_u_t_o_a_d_d]) Checks if _l_i_b_r_a_r_y provides _s_y_m_b_o_l. If the value of _a_u_t_o_a_d_d is 1 and the library provides the specified _s_y_m_b_o_l, appends the library to the LIBS construction environment variable. _l_i_b_r_a_r_y may also be None (the default), in which case _s_y_m_b_o_l is checked with the current LIBS variable, or a list of library names, in which case each library in the list will be checked for _s_y_m_b_o_l. The default _s_y_m_b_o_l is "main", which just check if you can link against the specified _l_i_b_r_a_r_y. The optional _l_a_n_g_u_a_g_e argument should be CC or CC++++ and selects the compiler to be used for the check; the default is "C". The default value for _a_u_t_o_a_d_d is 1. It is assumed, that the C-language is used. This method returns 1 on success and 0 on error. Configure.CheckLibWithHeader(_s_e_l_f, _l_i_b_r_a_r_y, _h_e_a_d_e_r, _l_a_n_g_u_a_g_e, [_c_a_l_l, _a_u_t_o_a_d_d]) In contrast to the Configure.CheckLib call, this call provides a more sophisticated way to check against libraries. Again, _l_i_b_r_a_r_y specifies the library or a list of libraries to check. _h_e_a_d_e_r specifies a header to check for. _h_e_a_d_e_r may be a list, in which case the last item in the list is the header file to be checked, and the previous list items are header files whose ##iinncclluuddee lines should precede the header line being checked for. _l_a_n_g_u_a_g_e may be one of 'C','c','CXX','cxx','C++' and 'c++'. _c_a_l_l can be any valid expression (with a trailing ';'). The default is 'main();'. _a_u_t_o_a_d_d specifies whether to add the library to the environment (only if the check succeeds). This method returns 1 on success and 0 on error. Configure.CheckType(_s_e_l_f, _t_y_p_e___n_a_m_e, [_i_n_c_l_u_d_e_s, _l_a_n_g_u_a_g_e]) Checks for the existence of a type defined by ttyyppeeddeeff. _t_y_p_e___n_a_m_e specifies the typedef name to check for. _i_n_c_l_u_d_e_s is a string containing one or more ##iinncclluuddee lines that will be inserted into the program that will be run to test for the exis- tence of the type. The optional _l_a_n_g_u_a_g_e argument should be CC or CC++++ and selects the compiler to be used for the check; the default is "C". Example of a typical Configure usage: env = Environment() conf = Configure( env ) if not conf.CheckCHeader( 'math.h' ): print 'We really need math.h!' Exit(1) if conf.CheckLibWithHeader( 'qt', 'qapp.h', 'c++', 'QApplication qapp(0,0);' ): # do stuff for qt - usage, e.g. conf.env.Append( CPPFLAGS = '-DWITH_QT' ) env = conf.Finish() You can define your own custom checks. in addition to the predefined checks. These are passed in a dictionary to the Configure function. This dictionary maps the names of the checks to user defined Python callables (either Python functions or class instances implementing the _____c_a_l_l____ method). The first argument of the call is always a _C_h_e_c_k_C_o_n_- _t_e_x_t instance followed by the arguments, which must be supplied by the user of the check. These CheckContext instances define the following methods: CheckContext.Message(_s_e_l_f, _t_e_x_t) Usually called before the check is started. _t_e_x_t will be dis- played to the user, e.g. 'Checking for library X...' CheckContext.Result(_s_e_l_f_,, _r_e_s) Usually called after the check is done. _r_e_s can be either an integer or a string. In the former case, 'ok' (res != 0) or 'failed' (res == 0) is displayed to the user, in the latter case the given string is displayed. CheckContext.TryCompile(_s_e_l_f, _t_e_x_t, _e_x_t_e_n_s_i_o_n) Checks if a file with the specified _e_x_t_e_n_s_i_o_n (e.g. '.c') con- taining _t_e_x_t can be compiled using the environment's OObbjjeecctt builder. Returns 1 on success and 0 on failure. CheckContext.TryLink(_s_e_l_f, _t_e_x_t, _e_x_t_e_n_s_i_o_n) Checks, if a file with the specified _e_x_t_e_n_s_i_o_n (e.g. '.c') con- taining _t_e_x_t can be compiled using the environment's PPrrooggrraamm builder. Returns 1 on success and 0 on failure. CheckContext.TryRun(_s_e_l_f, _t_e_x_t, _e_x_t_e_n_s_i_o_n) Checks, if a file with the specified _e_x_t_e_n_s_i_o_n (e.g. '.c') con- taining _t_e_x_t can be compiled using the environment's PPrrooggrraamm builder. On success, the program is run. If the program executes successfully (that is, its return status is 0), a tuple _(_1_, _o_u_t_- _p_u_t_S_t_r_) is returned, where _o_u_t_p_u_t_S_t_r is the standard output of the program. If the program fails execution (its return status is non-zero), then (0, '') is returned. CheckContext.TryAction(_s_e_l_f, _a_c_t_i_o_n, [_t_e_x_t, _e_x_t_e_n_s_i_o_n]) Checks if the specified _a_c_t_i_o_n with an optional source file (contents _t_e_x_t , extension _e_x_t_e_n_s_i_o_n = '' ) can be executed. _a_c_t_i_o_n may be anything which can be converted to a ssccoonnss Action. On success, _(_1_, _o_u_t_p_u_t_S_t_r_) is returned, where _o_u_t_p_u_t_S_t_r is the content of the target file. On failure _(_0_, _'_'_) is returned. CheckContext.TryBuild(_s_e_l_f, _b_u_i_l_d_e_r, [_t_e_x_t, _e_x_t_e_n_s_i_o_n]) Low level implementation for testing specific builds; the meth- ods above are based on this method. Given the Builder instance _b_u_i_l_d_e_r and the optional _t_e_x_t of a source file with optional _e_x_t_e_n_s_i_o_n, this method returns 1 on success and 0 on failure. In addition, _s_e_l_f_._l_a_s_t_T_a_r_g_e_t is set to the build target node, if the build was successful. Example for implementing and using custom tests: def CheckQt(context, qtdir): context.Message( 'Checking for qt ...' ) lastLIBS = context.env['LIBS'] lastLIBPATH = context.env['LIBPATH'] lastCPPPATH= context.env['CPPPATH'] context.env.Append(LIBS = 'qt', LIBPATH = qtdir + '/lib', CPPPATH = qtdir + '/include' ) ret = context.TryLink(""" #include int main(int argc, char **argv) { QApplication qapp(argc, argv); return 0; } """) if not ret: context.env.Replace(LIBS = lastLIBS, LIBPATH=lastLIBPATH, CPPPATH=lastCPPPATH) context.Result( ret ) return ret env = Environment() conf = Configure( env, custom_tests = { 'CheckQt' : CheckQt } ) if not conf.CheckQt('/usr/lib/qt'): print 'We really need qt!' Exit(1) env = conf.Finish() CCoonnssttrruuccttiioonn VVaarriiaabbllee OOppttiioonnss Often when building software, various options need to be specified at build time that are not known when the SConstruct/SConscript files are written. For example, libraries needed for the build may be in non- standard locations, or site-specific compiler options may need to be passed to the compiler. ssccoonnss provides a mechanism for overridding construction variables from the command line or a text-based SConscript file through an Options object. To create an Options object, call the Options() function: Options([_f_i_l_e_s], [_a_r_g_s]) This creates an Options object that will read construction vari- ables from the file or list of filenames specified in _f_i_l_e_s. If no files are specified, or the _f_i_l_e_s argument is NNoonnee, then no files will be read. The optional argument _a_r_g_s is a dictionary of values that will override anything read from the specified files; it is primarily intended to be passed the AARRGGUUMMEENNTTSS dic- tionary that holds variables specified on the command line. Example: opts = Options('custom.py') opts = Options('overrides.py', ARGUMENTS) opts = Options(None, {FOO:'expansion', BAR:7}) Options objects have the following methods: Add(_k_e_y, [_h_e_l_p, _d_e_f_a_u_l_t, _v_a_l_i_d_a_t_o_r, _c_o_n_v_e_r_t_e_r]) This adds a customizable construction variable to the Options object. _k_e_y is the name of the variable. _h_e_l_p is the help text for the variable. _d_e_f_a_u_l_t is the default value of the variable; if the default value is NNoonnee and there is no explicit value specified, the construction variable will _n_o_t be added to the construction environment. _v_a_l_i_d_a_t_o_r is called to validate the value of the variable, and should take three arguments: key, value, and environment _c_o_n_v_e_r_t_e_r is called to convert the value before putting it in the environment, and should take a single argument: value. Example: opts.Add('CC', 'The C compiler') AddOptions(_l_i_s_t) A wrapper script that adds multiple customizable construction variables to an Options object. _l_i_s_t is a list of tuple or list objects that contain the arguments for an individual call to the AAdddd method. opt.AddOptions( ('debug', '', 0), ('CC', 'The C compiler'), ('VALIDATE', 'An option for testing validation', 'notset', validator, None), ) Update(_e_n_v, [_a_r_g_s]) This updates a construction environment _e_n_v with the customized construction variables. Normally this method is not called directly, but is called indirectly by passing the Options object to the Environment() function: env = Environment(options=opts) Save(_f_i_l_e_n_a_m_e, _e_n_v) This saves the currently set options into a script file named _f_i_l_e_n_a_m_e that can be used on the next invocation to automati- cally load the current settings. This method combined with the Options method can be used to support caching of options between runs. env = Environment() opts = Options(['options.cache', 'custom.py']) opts.Add(...) opts.Update(env) opts.Save('options.cache', env) GenerateHelpText(_e_n_v, [_s_o_r_t]) This generates help text documenting the customizable construc- tion variables suitable to passing in to the Help() function. _e_n_v is the construction environment that will be used to get the actual values of customizable variables. Calling with an optional _s_o_r_t function will cause the output to be sorted by the specified argument. The specific _s_o_r_t function should take two arguments and return -1, 0 or 1 (like the standard Python _c_m_p function). Help(opts.GenerateHelpText(env)) Help(opts.GenerateHelpText(env, sort=cmp)) The text based SConscript file is executed as a Python script, and the global variables are queried for customizable construction variables. Example: CC = 'my_cc' To make it more convenient to work with customizable Options, ssccoonnss provides a number of functions that make it easy to set up various types of Options: BoolOption(_k_e_y, _h_e_l_p, _d_e_f_a_u_l_t) Return a tuple of arguments to set up a Boolean option. The option will use the specified name _k_e_y, have a default value of _d_e_f_a_u_l_t, and display the specified _h_e_l_p text. The option will interpret the values yy, yyeess, tt, ttrruuee, 11, oonn and aallll as true, and the values nn, nnoo, ff, ffaallssee, 00, ooffff and nnoonnee as false. EnumOption(_k_e_y, _h_e_l_p, _d_e_f_a_u_l_t, _a_l_l_o_w_e_d___v_a_l_u_e_s, [_m_a_p, _i_g_n_o_r_e_c_a_s_e]) Return a tuple of arguments to set up an option whose value may be one of a specified list of legal enumerated values. The option will use the specified name _k_e_y, have a default value of _d_e_f_a_u_l_t, and display the specified _h_e_l_p text. The option will only support those values in the _a_l_l_o_w_e_d___v_a_l_u_e_s list. The optional _m_a_p argument is a dictionary that can be used to con- vert input values into specific legal values in the _a_l_l_o_w_e_d___v_a_l_- _u_e_s list. If the value of _i_g_n_o_r_e___c_a_s_e is 00 (the default), then the values are case-sensitive. If the value of _i_g_n_o_r_e___c_a_s_e is 11, then values will be matched case-insensitive. If the value of _i_g_n_o_r_e___c_a_s_e is 11, then values will be matched case-insensi- tive, and all input values will be converted to lower case. ListOption(_k_e_y, _h_e_l_p, _d_e_f_a_u_l_t, _n_a_m_e_s, [_,map_]_) Return a tuple of arguments to set up an option whose value may be one or more of a specified list of legal enumerated values. The option will use the specified name _k_e_y, have a default value of _d_e_f_a_u_l_t, and display the specified _h_e_l_p text. The option will only support the values aallll, nnoonnee, or the values in the _n_a_m_e_s list. More than one value may be specified, with all val- ues separated by commas. The default may be a string of comma- separated default values, or a list of the default values. The optional _m_a_p argument is a dictionary that can be used to con- vert input values into specific legal values in the _n_a_m_e_s list. PackageOption(_k_e_y, _h_e_l_p, _d_e_f_a_u_l_t) Return a tuple of arguments to set up an option whose value is a path name of a package that may be enabled, disabled or given an explicit path name. The option will use the specified name _k_e_y, have a default value of _d_e_f_a_u_l_t, and display the specified _h_e_l_p text. The option will support the values yyeess, ttrruuee, oonn, eennaabbllee or sseeaarrcchh, in which case the specified _d_e_f_a_u_l_t will be used, or the option may be set to an arbitrary string (typically the path name to a package that is being enabled). The option will also support the values nnoo, ffaallssee, ooffff or ddiissaabbllee to disable use of the specified option. PathOption(_k_e_y, _h_e_l_p, _d_e_f_a_u_l_t, [_v_a_l_i_d_a_t_o_r]) Return a tuple of arguments to set up an option whose value is expected to be a path name. The option will use the specified name _k_e_y, have a default value of _d_e_f_a_u_l_t, and display the spec- ified _h_e_l_p text. An additional _v_a_l_i_d_a_t_o_r may be specified that will be called to verify that the specified path is acceptable. SCons supplies the following ready-made validators: PPaatthhOOpp-- ttiioonn..PPaatthhEExxiissttss (the default), which verifies that the specified path exists; PPaatthhOOppttiioonn..PPaatthhIIssFFiillee, which verifies that the specified path is an existing file; PPaatthhOOppttiioonn..PPaatthhIIssDDiirr, which verifies that the specified path is an existing directory; and PPaatthhOOppttiioonn..PPaatthhIIssDDiirrCCrreeaattee, which verifies that the specified path is a directory, and will create the specified directory if the path does not exist. You may supply your own _v_a_l_i_d_a_t_o_r function, which must take three arguments (_k_e_y, the name of the options variable to be set; _v_a_l, the specified value being checked; and _e_n_v, the construction environment) and should raise an exception if the specified value is not acceptable. These functions make it convenient to create a number of options with consistent behavior in a single call to the AAddddOOppttiioonnss method: opts.AddOptions( BoolOption('warnings', 'compilation with -Wall and similiar', 1), EnumOption('debug', 'debug output and symbols', 'no' allowed_values=('yes', 'no', 'full'), map={}, ignorecase=0), # case sensitive ListOption('shared', 'libraries to build as shared libraries', 'all', names = list_of_libs), PackageOption('x11', 'use X11 installed here (yes = search some places)', 'yes'), PathOption('qtdir', 'where the root of Qt is installed', qtdir), PathOption('foopath', 'where the foo library is installed', foopath, PathOption.PathIsDir), ) FFiillee aanndd DDiirreeccttoorryy NNooddeess The _F_i_l_e() and _D_i_r() functions return _F_i_l_e and _D_i_r Nodes, respectively. python objects, respectively. Those objects have several user-visible attributes and methods that are often useful: path The build path of the given file or directory. This path is relative to the top-level directory (where the SSCCoonnssttrruucctt file is found). The build path is the same as the source path if _b_u_i_l_d___d_i_r is not being used. abspath The absolute build path of the given file or directory. srcnode() The _s_r_c_n_o_d_e() method returns another _F_i_l_e or _D_i_r object repre- senting the _s_o_u_r_c_e path of the given _F_i_l_e or _D_i_r. The # Get the current build dir's path, relative to top. Dir('.').path # Current dir's absolute path Dir('.').abspath # Next line is always '.', because it is the top dir's path relative to itself. Dir('#.').path File('foo.c').srcnode().path # source path of the given source file. # Builders also return File objects: foo = env.Program('foo.c') print "foo will be built in %s"%foo.path EEXXTTEENNDDIINNGG SSCCOONNSS BBuuiillddeerr OObbjjeeccttss ssccoonnss can be extended to build different types of targets by adding new Builder objects to a construction environment. _I_n _g_e_n_e_r_a_l, you should only need to add a new Builder object when you want to build a new type of file or other external target. If you just want to invoke a differ- ent compiler or other tool to build a Program, Object, Library, or any other type of output file for which ssccoonnss already has an existing Builder, it is generally much easier to use those existing Builders in a construction environment that sets the appropriate construction vari- ables (CC, LINK, etc.). Builder objects are created using the BBuuiillddeerr function. The BBuuiillddeerr function accepts the following arguments: action The command line string used to build the target from the source. aaccttiioonn can also be: a list of strings representing the command to be executed and its arguments (suitable for enclosing white space in an argument), a dictionary mapping source file name suffixes to any combination of command line strings (if the builder should accept multiple source file extensions), a Python function; an Action object (see the next section); or a list of any of the above. An action function takes three arguments: _s_o_u_r_c_e - a list of source nodes, _t_a_r_g_e_t - a list of target nodes, _e_n_v - the con- struction environment. prefix The prefix that will be prepended to the target file name. This may be specified as a: * _s_t_r_i_n_g, * _c_a_l_l_a_b_l_e _o_b_j_e_c_t - a function or other callable that takes two arguments (a construction environment and a list of sources) and returns a prefix, * _d_i_c_t_i_o_n_a_r_y - specifies a mapping from a specific source suffix (of the first source specified) to a correspond- ing target prefix. Both the source suffix and target prefix specifications may use environment variable sub- stitution, and the target prefix (the 'value' entries in the dictionary) may also be a callable object. The default target prefix may be indicated by a dictionary entry with a key value of None. b = Builder("build_it < $SOURCE > $TARGET" prefix = "file-") def gen_prefix(env, sources): return "file-" + env['PLATFORM'] + '-' b = Builder("build_it < $SOURCE > $TARGET", prefix = gen_prefix) b = Builder("build_it < $SOURCE > $TARGET", suffix = { None: "file-", "$SRC_SFX_A": gen_prefix }) suffix The suffix that will be appended to the target file name. This may be specified in the same manner as the prefix above. If the suffix is a string, then ssccoonnss will append a '.' to the begin- ning of the suffix if it's not already there. The string returned by callable object (or obtained from the dictionary) is untouched and must append its own '.' to the beginning if one is desired. b = Builder("build_it < $SOURCE > $TARGET" suffix = "-file") def gen_suffix(env, sources): return "." + env['PLATFORM'] + "-file" b = Builder("build_it < $SOURCE > $TARGET", suffix = gen_suffix) b = Builder("build_it < $SOURCE > $TARGET", suffix = { None: ".sfx1", "$SRC_SFX_A": gen_suffix }) src_suffix The expected source file name suffix. This may be a string or a list of strings. target_scanner A Scanner object that will be invoked to find implicit dependen- cies for this target file. This keyword argument should be used for Scanner objects that find implicit dependencies based only on the target file and the construction environment, _n_o_t for implicit (See the section "Scanner Objects," below, for informa- tion about creating Scanner objects.) source_scanner A Scanner object that will be invoked to find implicit depen- dences in any source files used to build this target file. This is where you would specify a scanner to find things like ##iinncclluuddee lines in source files. The pre-built DDiirrSSccaannnneerr Scan- ner object may be used to indicate that this Builder should scan directory trees for on-disk changes to files that ssccoonnss does not know about from other Builder or function calls. (See the sec- tion "Scanner Objects," below, for information about creating your own Scanner objects.) target_factory A factory function that the Builder will use to turn any targets specified as strings into SCons Nodes. By default, SCons assumes that all targets are files. Other useful target_factory values include DDiirr, for when a Builder creates a directory tar- get, and EEnnttrryy, for when a Builder can create either a file or directory target. Example: MakeDirectoryBuilder = Builder(action=my_mkdir, target_factory=Dir) env = Environment() env.Append(BUILDERS = {'MakeDirectory':MakeDirectoryBuilder}) env.MakeDirectory('new_directory', []) Note that the call to the MakeDirectory Builder needs to specify an empty source list to make the string represent the builder's target; without that, it would assume the argument is the source, and would try to deduce the target name from it, which in the absence of an automati- cally-added prefix or suffix would lead to a matching target and source name and a circular dependency. source_factory A factory function that the Builder will use to turn any sources specified as strings into SCons Nodes. By default, SCons assumes that all source are files. Other useful source_factory values include DDiirr, for when a Builder uses a directory as a source, and EEnnttrryy, for when a Builder can use files or directo- ries (or both) as sources. Example: CollectBuilder = Builder(action=my_mkdir, source_factory=Entry) env = Environment() env.Append(BUILDERS = {'Collect':CollectBuilder}) env.Collect('archive', ['directory_name', 'file_name']) emitter A function or list of functions to manipulate the target and source lists before dependencies are established and the tar- get(s) are actually built. eemmiitttteerr can also be a string con- taining a construction variable to expand to an emitter function or list of functions, or a dictionary mapping source file suf- fixes to emitter functions. (Only the suffix of the first source file is used to select the actual emitter function from an emitter dictionary.) An emitter function takes three arguments: _s_o_u_r_c_e - a list of source nodes, _t_a_r_g_e_t - a list of target nodes, _e_n_v - the con- struction environment. An emitter must return a tuple contain- ing two lists, the list of targets to be built by this builder, and the list of sources for this builder. Example: def e(target, source, env): return (target + ['foo.foo'], source + ['foo.src']) # Simple association of an emitter function with a Builder. b = Builder("my_build < $TARGET > $SOURCE", emitter = e) def e2(target, source, env): return (target + ['bar.foo'], source + ['bar.src']) # Simple association of a list of emitter functions with a Builder. b = Builder("my_build < $TARGET > $SOURCE", emitter = [e, e2]) # Calling an emitter function through a construction variable. env = Environment(MY_EMITTER = e) b = Builder("my_build < $TARGET > $SOURCE", emitter = '$MY_EMITTER') # Calling a list of emitter functions through a construction variable. env = Environment(EMITTER_LIST = [e, e2]) b = Builder("my_build < $TARGET > $SOURCE", emitter = '$EMITTER_LIST') # Associating multiple emitters with different file # suffixes using a dictionary. def e_suf1(target, source, env): return (target + ['another_target_file'], source) def e_suf2(target, source, env): return (target, source + ['another_source_file']) b = Builder("my_build < $TARGET > $SOURCE", emitter = {'.suf1' : e_suf1, '.suf2' : e_suf2}) The _g_e_n_e_r_a_t_o_r and _a_c_t_i_o_n arguments must not both be used for the same Builder. multi Specifies whether this builder is allowed to be called multiple times for the same target file(s). The default is 0, which means the builder can not be called multiple times for the same target file(s). Calling a builder multiple times for the same target simply adds additional source files to the target; it is not allowed to change the environment associated with the target, specify addition environment overrides, or associate a different builder with the target. env A construction environment that can be used to fetch source code using this Builder. (Note that this environment is _n_o_t used for normal builds of normal target files, which use the environment that was used to call the Builder for the target file.) generator A function that returns a list of actions that will be executed to build the target(s) from the source(s). The returned action(s) may be an Action object, or anything that can be con- verted into an Action object (see the next section). The generator function takes four arguments: _s_o_u_r_c_e - a list of source nodes, _t_a_r_g_e_t - a list of target nodes, _e_n_v - the con- struction environment, _f_o_r___s_i_g_n_a_t_u_r_e - a Boolean value that specifies whether the generator is being called for generating a build signature (as opposed to actually executing the command). Example: def g(source, target, env, for_signature): return [["gcc", "-c", "-o"] + target + source] b = Builder(generator=g) src_builder Specifies a builder to use when a source file name suffix does not match any of the suffixes of the builder. Using this argu- ment produces a multi-stage builder. single_source Specifies that this builder expects exactly one source file per call. Giving more than one source files without target files results in implicitely calling the builder multiple times (once for each source given). Giving multiple source files together with target files results in a UserError exception. The _g_e_n_e_r_a_t_o_r and _a_c_t_i_o_n arguments must not both be used for the same Builder. env A construction environment that can be used to fetch source code using this Builder. (Note that this environment is _n_o_t used for normal builds of normal target files, which use the environment that was used to call the Builder for the target file.) b = Builder(action="build < $SOURCE > $TARGET") env = Environment(BUILDERS = {'MyBuild' : b}) env.MyBuild('foo.out', 'foo.in', my_arg = 'xyzzy') chdir A directory from which scons will execute the action(s) speci- fied for this Builder. If the cchhddiirr argument is a string or a directory Node, scons will change to the specified directory. If the cchhddiirr is not a string or Node and is non-zero, then scons will change to the target file's directory. Note that scons will _n_o_t automatically modify its expansion of construction variables like $$TTAARRGGEETT and $$SSOOUURRCCEE when using the chdir keyword argument--that is, the expanded file names will still be relative to the top-level SConstruct directory, and consequently incorrect relative to the chdir directory. Builders created using chdir keyword argument, will need to use construction variable expansions like $${{TTAARRGGEETT..ffiillee}} and $${{SSOOUURRCCEE..ffiillee}} to use just the filename portion of the targets and source. b = Builder(action="build < ${SOURCE.file} > ${TARGET.file}", chdir=1) env = Environment(BUILDERS = {'MyBuild' : b}) env.MyBuild('sub/dir/foo.out', 'sub/dir/foo.in') Any additional keyword arguments supplied when a Builder object is cre- ated (that is, when the Builder() function is called) will be set in the executing construction environment when the Builder object is called. The canonical example here would be to set a construction variable to the repository of a source code system. Any additional keyword arguments supplied when a Builder _o_b_j_e_c_t is called will only be associated with the target created by that particu- lar Builder call (and any other files built as a result of the call). These extra keyword arguments are passed to the following functions: command generator functions, function Actions, and emitter functions. AAccttiioonn OObbjjeeccttss The BBuuiillddeerr(()) function will turn its aaccttiioonn keyword argument into an appropriate internal Action object. You can also explicity create Action objects using the AAccttiioonn() global function, which can then be passed to the BBuuiillddeerr() function. This can be used to configure an Action object more flexibly, or it may simply be more efficient than letting each separate Builder object create a separate Action when mul- tiple Builder objects need to do the same thing. The AAccttiioonn() global function returns an appropriate object for the action represented by the type of the first argument: Action If the first argument is already an Action object, the object is simply returned. String If the first argument is a string, a command-line Action is returned. Action('$CC -c -o $TARGET $SOURCES') List If the first argument is a list, then a list of Action objects is returned. An Action object is created as necessary for each element in the list. If an element _w_i_t_h_i_n the list is itself a list, the internal list is the command and arguments to be exe- cuted via the command line. This allows white space to be enclosed in an argument by defining a command in a list within a list: Action([['cc', '-c', '-DWHITE SPACE', '-o', '$TARGET', '$SOURCES']]) Function If the first argument is a Python function, a function Action is returned. The Python function takes three keyword arguments, ttaarrggeett (a Node object representing the target file), ssoouurrccee (a Node object representing the source file) and eennvv (the construc- tion environment used for building the target file). The ttaarrggeett and ssoouurrccee arguments may be lists of Node objects if there is more than one target file or source file. The actual target and source file name(s) may be retrieved from their Node objects via the built-in Python str() function: target_file_name = str(target) source_file_names = map(lambda x: str(x), source) The function should return 00 or NNoonnee to indicate a successful build of the target file(s). The function may raise an excep- tion or return a non-zero exit status to indicate an unsuccess- ful build. def build_it(target = None, source = None, env = None): # build the target from the source return 0 a = Action(build_it) If the action argument is not one of the above, None is returned. The second, optional argument is a Python function that returns a string to be printed to describe the action being executed. Like a function to build a file, this function takes three arguments: ttaarrggeett (a Node object representing the target file), ssoouurrccee (a Node object representing the source file) and eennvv (a construction environment). The ttaarrggeett and ssoouurrccee arguments may be lists of Node objects if there is more than one target file or source file. Examples: def build_it(target, source, env): # build the target from the source return 0 def string_it(target, source, env): return "building '%s' from '%s'" % (target[0], source[0]) # Use a positional argument. a = Action(build_it, string_it) # Alternatively, use a keyword argument. a = Action(build_it, strfunction=string_it) The third, also optional argument is a list of construction variables whose values will be included in the signature of the Action when deciding whether a target should be rebuilt because the action changed. This is necessary whenever you want a target to be rebuilt when a spe- cific construction variable changes, because the underlying Python code for a function will not change when the value of the construction vari- able does. def build_it(target, source, env): # build the target from the 'XXX' construction variable open(target[0], 'w').write(env['XXX']) return 0 def string_it(target, source): return "building '%s' from '%s'" % (target[0], source[0]) # Use positional arguments. a = Action(build_it, string_it, ['XXX']) # Alternatively, use a keyword argument. a = Action(build_it, varlist=['XXX']) The AAccttiioonn() global function also takes a cchhddiirr keyword argument which specifies that scons will execute the action after changing to the specified directory. If the chdir argument is a string or a directory Node, scons will change to the specified directory. If the chdir argu- ment is not a string or Node and is non-zero, then scons will change to the target file's directory. Note that scons will _n_o_t automatically modify its expansion of con- struction variables like $$TTAARRGGEETT and $$SSOOUURRCCEE when using the chdir key- word argument--that is, the expanded file names will still be relative to the top-level SConstruct directory, and consequently incorrect rela- tive to the chdir directory. Builders created using chdir keyword argument, will need to use construction variable expansions like $${{TTAARR-- GGEETT..ffiillee}} and $${{SSOOUURRCCEE..ffiillee}} to use just the filename portion of the targets and source. a = Action("build < ${SOURCE.file} > ${TARGET.file}", chdir=1) MMiisscceellllaanneeoouuss AAccttiioonn FFuunnccttiioonnss ssccoonnss supplies a number of functions that arrange for various common file and directory manipulations to be performed. These are similar in concept to "tasks" in the Ant build tool, although the implementation is slightly different. These functions do not actually perform the specified action at the time the function is called, but instead return an Action object that can be executed at the appropriate time. (In Object-Oriented terminology, these are actually Action _F_a_c_t_o_r_y func- tions that return Action objects.) In practice, there are two natural ways that these Action Functions are intended to be used. First, if you need to perform the action at the time the SConscript file is being read, you can use the EExxeeccuuttee global function to do so: Execute(Touch('file')) Second, you can use these functions to supply Actions in a list for use by the CCoommmmaanndd method. This can allow you to perform more complicated sequences of file manipulation without relying on platform-specific external commands: that env = Environment(TMPBUILD = '/tmp/builddir') env.Command('foo.out', 'foo.in', [Mkdir('$TMPBUILD'), Copy('${SOURCE.dir}', '$TMPBUILD') "cd $TMPBUILD && make", Delete('$TMPBUILD')]) Chmod(_d_e_s_t, _m_o_d_e) Returns an Action object that changes the permissions on the specified _d_e_s_t file or directory to the specified _m_o_d_e. Exam- ples: Execute(Chmod('file', 0755)) env.Command('foo.out', 'foo.in', [Copy('$TARGET', '$SOURCE'), Chmod('$TARGET', 0755)]) Copy(_d_e_s_t, _s_r_c) Returns an Action object that will copy the _s_r_c source file or directory to the _d_e_s_t destination file or directory. Examples: Execute(Copy('foo.output', 'foo.input')) env.Command('bar.out', 'bar.in', Copy('$TARGET', '$SOURCE')) Delete(_e_n_t_r_y, [_m_u_s_t___e_x_i_s_t]) Returns an Action that deletes the specified _e_n_t_r_y, which may be a file or a directory tree. If a directory is specified, the entire directory tree will be removed. If the _m_u_s_t___e_x_i_s_t flag is set, then a Python error will be thrown if the specified entry does not exist; the default is mmuusstt__eexxiisstt==00, that is, the Action will silently do nothing if the entry does not exist. Examples: Execute(Delete('/tmp/buildroot')) env.Command('foo.out', 'foo.in', [Delete('${TARGET.dir}'), MyBuildAction]) Execute(Delete('file_that_must_exist', must_exist=1)) Mkdir(_d_i_r) Returns an Action that creates the specified directory _d_i_r _. Examples: Execute(Mkdir('/tmp/outputdir')) env.Command('foo.out', 'foo.in', [Mkdir('/tmp/builddir', Copy('$SOURCE', '/tmp/builddir') "cd /tmp/builddir && ]) Move(_d_e_s_t, _s_r_c) Returns an Action that moves the specified _s_r_c file or directory to the specified _d_e_s_t file or directory. Examples: Execute(Move('file.destination', 'file.source')) env.Command('output_file', 'input_file', [MyBuildAction, Move('$TARGET', 'file_created_by_MyBuildAction')]) Touch(_f_i_l_e) Returns an Action that updates the modification time on the specified _f_i_l_e. Examples: Execute(Touch('file_to_be_touched')) env.Command('marker', 'input_file', [MyBuildAction, Touch('$TARGET')]) VVaarriiaabbllee SSuubbssttiittuuttiioonn Before executing a command, ssccoonnss performs construction variable inter- polation on the strings that make up the command line of builders. Variables are introduced by a $$ prefix. Besides construction vari- ables, scons provides the following variables for each command execu- tion: TARGET The file name of the target being built, or the file name of the first target if multiple targets are being built. TARGETS The file names of all targets being built. SOURCE The file name of the source of the build command, or the file name of the first source if multiple sources are being built. SOURCES The file names of the sources of the build command. (Note that the above variables are reserved and may not be set in a construction environment.) For example, given the construction variable CC='cc', targets=['foo'], and sources=['foo.c', 'bar.c']: action='$CC -c -o $TARGET $SOURCES' would produce the command line: cc -c -o foo foo.c bar.c Variable names may be surrounded by curly braces ({}) to separate the name from the trailing characters. Within the curly braces, a variable name may have a Python slice subscript appended to select one or more items from a list. In the previous example, the string: ${SOURCES[1]} would produce: bar.c Additionally, a variable name may have the following special modifiers appended within the enclosing curly braces to modify the interpolated string: base The base path of the file name, including the directory path but excluding any suffix. dir The name of the directory in which the file exists. file The file name, minus any directory portion. filebase Just the basename of the file, minus any suffix and minus the directory. suffix Just the file suffix. abspath The absolute path name of the file. posix The POSIX form of the path, with directories separated by // (forward slashes) not backslashes. This is sometimes necessary on Win32 systems when a path references a file on other (POSIX) systems. srcpath The directory and file name to the source file linked to this file through BuildDir. If this file isn't linked, it just returns the directory and filename unchanged. srcdir The directory containing the source file linked to this file through BuildDir. If this file isn't linked, it just returns the directory part of the filename. rsrcpath The directory and file name to the source file linked to this file through BuildDir. If the file does not exist locally but exists in a Repository, the path in the Repository is returned. If this file isn't linked, it just returns the directory and filename unchanged. rsrcdir The Repository directory containing the source file linked to this file through BuildDir. If this file isn't linked, it just returns the directory part of the filename. For example, the specified target will expand as follows for the corre- sponding modifiers: $TARGET => sub/dir/file.x ${TARGET.base} => sub/dir/file ${TARGET.dir} => sub/dir ${TARGET.file} => file.x ${TARGET.filebase} => file ${TARGET.suffix} => .x ${TARGET.abspath} => /top/dir/sub/dir/file.x SConscript('src/SConscript', build_dir='sub/dir') $SOURCE => sub/dir/file.x ${SOURCE.srcpath} => src/file.x ${SOURCE.srcdir} => src Repository('/usr/repository') $SOURCE => sub/dir/file.x ${SOURCE.rsrcpath} => /usr/repository/src/file.x ${SOURCE.rsrcdir} => /usr/repository/src Lastly, a variable name may be a callable Python function associated with a construction variable in the environment. The function should take four arguments: _t_a_r_g_e_t - a list of target nodes, _s_o_u_r_c_e - a list of source nodes, _e_n_v - the construction environment, _f_o_r___s_i_g_n_a_t_u_r_e - a Boolean value that specifies whether the function is being called for generating a build signature. SCons will insert whatever the called function returns into the expanded string: def foo(target, source, env, for_signature): return "bar" # Will expand $BAR to "bar baz" env=Environment(FOO=foo, BAR="$FOO baz") You can use this feature to pass arguments to a Python function by cre- ating a callable class that stores one or more arguments in an object, and then uses them when the ____ccaallll____(()) method is called. Note that in this case, the entire variable expansion must be enclosed by curly braces so that the arguments will be associated with the instantiation of the class: class foo: def __init__(self, arg): self.arg = arg def __call__(self, target, source, env, for_signature): return arg + " bar" # Will expand $BAR to "my argument bar baz" env=Environment(FOO=foo, BAR="${FOO('my argument')} baz") The special pseudo-variables $$(( and $$)) may be used to surround parts of a command line that may change _w_i_t_h_o_u_t causing a rebuild--that is, which are not included in the signature of target files built with this command. All text between $$(( and $$)) will be removed from the command line before it is added to file signatures, and the $$(( and $$)) will be removed before the command is executed. For example, the command line: echo Last build occurred $( $TODAY $). > $TARGET would execute the command: echo Last build occurred $TODAY. > $TARGET but the command signature added to any target files would be: echo Last build occurred . > $TARGET SCons uses the following rules when converting construction variables into command lines: String When the value is a string it is interpreted as a space delim- ited list of command line arguments. List When the value is a list it is interpreted as a list of command line arguments. Each element of the list is converted to a string. Other Anything that is not a list or string is converted to a string and interpreted as a single command line argument. Newline Newline characters (\n) delimit lines. The newline parsing is done after all other parsing, so it is not possible for argu- ments (e.g. file names) to contain embedded newline characters. This limitation will likely go away in a future version of SCons. SSccaannnneerr OObbjjeeccttss You can use the SSccaannnneerr function to define objects to scan new file types for implicit dependencies. Scanner accepts the following argu- ments: function A Python function that will process the Node (file) and return a list of strings (file names) representing the implicit dependen- cies found in the contents. The function takes three or four arguments: def scanner_function(node, env, path): def scanner_function(node, env, path, arg): The nnooddee argument is the internal SCons node representing the file. Use ssttrr((nnooddee)) to fetch the name of the file, and nnooddee..ggeett__ccoonntteennttss(()) to fetch contents of the file. The eennvv argument is the construction environment for the scan. Fetch values from it using the eennvv..DDiiccttiioonnaarryy(()) method. The ppaatthh argument is a tuple (or list) of directories that can be searched for files. This will usually be the tuple returned by the ppaatthh__ffuunnccttiioonn argument (see below). The aarrgg argument is the argument supplied when the scanner was created, if any. name The name of the Scanner. This is mainly used to identify the Scanner internally. argument An optional argument that, if specified, will be passed to the scanner function (described above) and the path function (speci- fied below). skeys An optional list that can be used to determine which scanner should be used for a given Node. In the usual case of scanning for file names, this argument will be a list of suffixes for the different file types that this Scanner knows how to scan. If the argument is a string, then it will be expanded into a list by the current environment. path_function A Python function that takes two or three arguments: a construc- tion environment, directory Node, and optional argument supplied when the scanner was created. The ppaatthh__ffuunnccttiioonn returns a tuple of directories that can be searched for files to be returned by this Scanner object. node_class The class of Node that should be returned by this Scanner object. Any strings or other objects returned by the scanner function that are not of this class will be run through the nnooddee__ffaaccttoorryy function. node_factory A Python function that will take a string or other object and turn it into the appropriate class of Node to be returned by this Scanner object. scan_check An optional Python function that takes two arguments, a Node (file) and a construction environment, and returns whether the Node should, in fact, be scanned for dependencies. This check can be used to eliminate unnecessary calls to the scanner func- tion when, for example, the underlying file represented by a Node does not yet exist. recursive An optional flag that specifies whether this scanner should be re-invoked on the dependency files returned by the scanner. When this flag is not set, the Node subsystem will only invoke the scanner on the file being scanned, and not (for example) also on the files specified by the #include lines in the file being scanned. _r_e_c_u_r_s_i_v_e may be a callable function, in which case it will be called with a list of Nodes found and should return a list of Nodes that should be scanned recursively; this can be used to select a specific subset of Nodes for additional scanning. Note that ssccoonnss has a global SSoouurrcceeFFiilleeSSccaannnneerr object that is used by the OObbjjeecctt(), SShhaarreeddOObbjjeecctt(), and SSttaattiiccOObbjjeecctt() builders to decide which scanner should be used for different file extensions. You can using the SSoouurrcceeFFiilleeSSccaannnneerr..aadddd__ssccaann-- nneerr() method to add your own Scanner object to the ssccoonnss infras- tructure that builds target programs or libraries from a list of source files of different types: def xyz_scan(node, env, path): contents = node.get_contents() # Scan the contents and return the included files. XYZScanner = Scanner(xyz_scan) SourceFileScanner.add_scanner('.xyx', XYZScanner) env.Program('my_prog', ['file1.c', 'file2.f', 'file3.xyz']) SSYYSSTTEEMM--SSPPEECCIIFFIICC BBEEHHAAVVIIOORR SCons and its configuration files are very portable, due largely to its implementation in Python. There are, however, a few portability issues waiting to trap the unwary. ..CC ffiillee ssuuffffiixx SCons handles the upper-case ..CC file suffix differently, depending on the capabilities of the underlying system. On a case-sensitive system such as Linux or UNIX, SCons treats a file with a ..CC suffix as a C++ source file. On a case-insensitive system such as Windows, SCons treats a file with a ..CC suffix as a C source file. ..FF ffiillee ssuuffffiixx SCons handles the upper-case ..FF file suffix differently, depending on the capabilities of the underlying system. On a case-sensitive system such as Linux or UNIX, SCons treats a file with a ..FF suffix as a For- tran source file that is to be first run through the standard C prepro- cessor. On a case-insensitive system such as Windows, SCons treats a file with a ..FF suffix as a Fortran source file that should _n_o_t be run through the C preprocessor. WWIINN3322:: CCyyggwwiinn TToooollss aanndd CCyyggwwiinn PPyytthhoonn vvss.. WWiinnddoowwss PPyytthhoonnss Cygwin supplies a set of tools and utilities that let users work on a Windows system using a more POSIX-like environment. The Cygwin tools, including Cygwin Python, do this, in part, by sharing an ability to interpret UNIX-like path names. For example, the Cygwin tools will internally translate a Cygwin path name like /cygdrive/c/mydir to an equivalent Windows pathname of C:/mydir (equivalent to C:\mydir). Versions of Python that are built for native Windows execution, such as the python.org and ActiveState versions, do not have the Cygwin path name semantics. This means that using a native Windows version of Python to build compiled programs using Cygwin tools (such as gcc, bison, and flex) may yield unpredictable results. "Mixing and match- ing" in this way can be made to work, but it requires careful attention to the use of path names in your SConscript files. In practice, users can sidestep the issue by adopting the following rules: When using gcc, use the Cygwin-supplied Python interpreter to run SCons; when using Microsoft Visual C/C++ (or some other Windows compiler) use the python.org or ActiveState version of Python to run SCons. WWIINN3322:: ssccoonnss..bbaatt ffiillee On WIN32 systems, SCons is executed via a wrapper ssccoonnss..bbaatt file. This has (at least) two ramifications: First, Windows command-line users that want to use variable assignment on the command line may have to put double quotes around the assign- ments: scons "FOO=BAR" "BAZ=BLEH" Second, the Cygwin shell does not recognize this file as being the same as an ssccoonnss command issued at the command-line prompt. You can work around this either by executing ssccoonnss..bbaatt from the Cygwin command line, or by creating a wrapper shell script named ssccoonnss .. MMiinnGGWW The MinGW bin directory must be in your PATH environment variable or the PATH variable under the ENV construction variable for SCons to detect and use the MinGW tools. When running under the native Windows Python interpreter, SCons will prefer the MinGW tools over the Cygwin tools, if they are both installed, regardless of the order of the bin directories in the PATH variable. If you have both MSVC and MinGW installed and you want to use MinGW instead of MSVC, then you must explictly tell SCons to use MinGW by passing tools=['mingw'] to the Environment() function, because SCons will prefer the MSVC tools over the MinGW tools. EEXXAAMMPPLLEESS To help you get started using SCons, this section contains a brief overview of some common tasks. BBaassiicc CCoommppiillaattiioonn FFrroomm aa SSiinnggllee SSoouurrccee FFiillee env = Environment() env.Program(target = 'foo', source = 'foo.c') Note: Build the file by specifying the target as an argument ("scons foo" or "scons foo.exe"). or by specifying a dot ("scons ."). BBaassiicc CCoommppiillaattiioonn FFrroomm MMuullttiippllee SSoouurrccee FFiilleess env = Environment() env.Program(target = 'foo', source = Split('f1.c f2.c f3.c')) SSeettttiinngg aa CCoommppiillaattiioonn FFllaagg env = Environment(CCFLAGS = '-g') env.Program(target = 'foo', source = 'foo.c') SSeeaarrcchh TThhee LLooccaall DDiirreeccttoorryy FFoorr ..hh FFiilleess Note: You do _n_o_t need to set CCFLAGS to specify -I options by hand. SCons will construct the right -I options from CPPPATH. env = Environment(CPPPATH = ['.']) env.Program(target = 'foo', source = 'foo.c') SSeeaarrcchh MMuullttiippllee DDiirreeccttoorriieess FFoorr ..hh FFiilleess env = Environment(CPPPATH = ['include1', 'include2']) env.Program(target = 'foo', source = 'foo.c') BBuuiillddiinngg aa SSttaattiicc LLiibbrraarryy env = Environment() env.StaticLibrary(target = 'foo', source = Split('l1.c l2.c')) env.StaticLibrary(target = 'bar', source = ['l3.c', 'l4.c']) BBuuiillddiinngg aa SShhaarreedd LLiibbrraarryy env = Environment() env.SharedLibrary(target = 'foo', source = ['l5.c', 'l6.c']) env.SharedLibrary(target = 'bar', source = Split('l7.c l8.c')) LLiinnkkiinngg aa LLooccaall LLiibbrraarryy IInnttoo aa PPrrooggrraamm env = Environment(LIBS = 'mylib', LIBPATH = ['.']) env.Library(target = 'mylib', source = Split('l1.c l2.c')) env.Program(target = 'prog', source = ['p1.c', 'p2.c']) DDeeffiinniinngg YYoouurr OOwwnn BBuuiillddeerr OObbjjeecctt Notice that when you invoke the Builder, you can leave off the target file suffix, and SCons will add it automatically. bld = Builder(action = 'pdftex < $SOURCES > $TARGET' suffix = '.pdf', src_suffix = '.tex') env = Environment(BUILDERS = {'PDFBuilder' : bld}) env.PDFBuilder(target = 'foo.pdf', source = 'foo.tex') # The following creates "bar.pdf" from "bar.tex" env.PDFBuilder(target = 'bar', source = 'bar') Note also that the above initialization overwrites the default Builder objects, so the Environment created above can not be used call Builders like env.Program(), env.Object(), env.StaticLibrary(), etc. AAddddiinngg YYoouurr OOwwnn BBuuiillddeerr OObbjjeecctt ttoo aann EEnnvviirroonnmmeenntt bld = Builder(action = 'pdftex < $SOURCES > $TARGET' suffix = '.pdf', src_suffix = '.tex') env = Environment() env.Append(BUILDERS = {'PDFBuilder' : bld}) env.PDFBuilder(target = 'foo.pdf', source = 'foo.tex') env.Program(target = 'bar', source = 'bar.c') You also can use other Pythonic techniques to add to the BUILDERS con- struction variable, such as: env = Environment() env['BUILDERS]['PDFBuilder'] = bld DDeeffiinniinngg YYoouurr OOwwnn SSccaannnneerr OObbjjeecctt import re include_re = re.compile(r'^include\s+(\S+)$', re.M) def kfile_scan(node, env, path, arg): contents = node.get_contents() includes = include_re.findall(contents) return includes kscan = Scanner(name = 'kfile', function = kfile_scan, argument = None, skeys = ['.k']) scanners = Environment().Dictionary('SCANNERS') env = Environment(SCANNERS = scanners + [kscan]) env.Command('foo', 'foo.k', 'kprocess < $SOURCES > $TARGET') bar_in = File('bar.in') env.Command('bar', bar_in, 'kprocess $SOURCES > $TARGET') bar_in.target_scanner = kscan CCrreeaattiinngg aa HHiieerraarrcchhiiccaall BBuuiilldd Notice that the file names specified in a subdirectory's SConscript file are relative to that subdirectory. SConstruct: env = Environment() env.Program(target = 'foo', source = 'foo.c') SConscript('sub/SConscript') sub/SConscript: env = Environment() # Builds sub/foo from sub/foo.c env.Program(target = 'foo', source = 'foo.c') SConscript('dir/SConscript') sub/dir/SConscript: env = Environment() # Builds sub/dir/foo from sub/dir/foo.c env.Program(target = 'foo', source = 'foo.c') SShhaarriinngg VVaarriiaabblleess BBeettwweeeenn SSCCoonnssccrriipptt FFiilleess You must explicitly Export() and Import() variables that you want to share between SConscript files. SConstruct: env = Environment() env.Program(target = 'foo', source = 'foo.c') Export("env") SConscript('subdirectory/SConscript') subdirectory/SConscript: Import("env") env.Program(target = 'foo', source = 'foo.c') BBuuiillddiinngg MMuullttiippllee VVaarriiaannttss FFrroomm tthhee SSaammee SSoouurrccee Use the build_dir keyword argument to the SConscript function to estab- lish one or more separate build directories for a given source direc- tory: SConstruct: cppdefines = ['FOO'] Export("cppdefines") SConscript('src/SConscript', build_dir='foo') cppdefines = ['BAR'] Export("cppdefines") SConscript('src/SConscript', build_dir='bar') src/SConscript: Import("cppdefines") env = Environment(CPPDEFINES = cppdefines) env.Program(target = 'src', source = 'src.c') Note the use of the Export() method to set the "cppdefines" variable to a different value each time we call the SConscript function. HHiieerraarrcchhiiccaall BBuuiilldd ooff TTwwoo LLiibbrraarriieess LLiinnkkeedd WWiitthh aa PPrrooggrraamm SConstruct: env = Environment(LIBPATH = ['#libA', '#libB']) Export('env') SConscript('libA/SConscript') SConscript('libB/SConscript') SConscript('Main/SConscript') libA/SConscript: Import('env') env.Library('a', Split('a1.c a2.c a3.c')) libB/SConscript: Import('env') env.Library('b', Split('b1.c b2.c b3.c')) Main/SConscript: Import('env') e = env.Copy(LIBS = ['a', 'b']) e.Program('foo', Split('m1.c m2.c m3.c')) The '#' in the LIBPATH directories specify that they're relative to the top-level directory, so they don't turn into "Main/libA" when they're used in Main/SConscript. Specifying only 'a' and 'b' for the library names allows SCons to append the appropriate library prefix and suffix for the current plat- form (for example, 'liba.a' on POSIX systems, CCuussttoommiizziinngg ccoonnttrruuccttiioonn vvaarriiaabblleess ffrroomm tthhee ccoommmmaanndd lliinnee.. The following would allow the C compiler to be specified on the command line or in the file custom.py. opts = Options('custom.py') opts.Add('CC', 'The C compiler.') env = Environment(options=opts) Help(opts.GenerateHelpText(env)) The user could specify the C compiler on the command line: scons "CC=my_cc" or in the custom.py file: CC = 'my_cc' or get documentation on the options: $ scons -h CC: The C compiler. default: None actual: cc UUssiinngg MMiiccrroossoofftt VViissuuaall CC++++ pprreeccoommppiilleedd hheeaaddeerrss Since windows.h includes everything and the kitchen sink, it can take quite some time to compile it over and over again for a bunch of object files, so Microsoft provides a mechanism to compile a set of headers once and then include the previously compiled headers in any object file. This technology is called precompiled headers. The general recipe is to create a file named "StdAfx.cpp" that includes a single header named "StdAfx.h", and then include every header you want to precompile in "StdAfx.h", and finally include "StdAfx.h" as the first header in all the source files you are compiling to object files. For example: StdAfx.h: #include #include StdAfx.cpp: #include Foo.cpp: #include /* do some stuff */ Bar.cpp: #include /* do some other stuff */ SConstruct: env=Environment() env['PCHSTOP'] = 'StdAfx.h' env['PCH'] = env.PCH('StdAfx.cpp')[0] env.Program('MyApp', ['Foo.cpp', 'Bar.cpp']) For more information see the document for the PCH builder, and the PCH and PCHSTOP construction variables. To learn about the details of pre- compiled headers consult the MSDN documention for /Yc, /Yu, and /Yp. UUssiinngg MMiiccrroossoofftt VViissuuaall CC++++ eexxtteerrnnaall ddeebbuuggggiinngg iinnffoorrmmaattiioonn Since including debugging information in programs and shared libraries can cause their size to increase significantly, Microsoft provides a mechanism for including the debugging information in an external file called a PDB file. SCons supports PDB files through the PDB construc- tion variable. SConstruct: env=Environment() env['PDB'] = 'MyApp.pdb' env.Program('MyApp', ['Foo.cpp', 'Bar.cpp']) For more information see the document for the PDB construction vari- able. EENNVVIIRROONNMMEENNTT SCONS_LIB_DIR Specifies the directory that contains the SCons Python module directory (e.g. /home/aroach/scons-src-0.01/src/engine). SCONSFLAGS A string of options that will be used by scons in addition to those passed on the command line. SSEEEE AALLSSOO ssccoonnss User Manual, ssccoonnss Design Document, ssccoonnss source code. AAUUTTHHOORRSS Steven Knight Anthony Roach February 2005 SCONS(1)