| SCons User Guide 0.96.95 | ||
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When you create a construction environment, SCons populates it with construction variables that are set up for various compilers, linkers and utilities that it finds on your system. Although this is usually helpful and what you want, it might be frustrating if SCons doesn't set certain variables that you expect to be sit. In situations like this, it's sometimes helpful to use the construction environment Dump method to print all or some of the construction variables. Note that the Dump method returns the representation of the variables in the environment for you to print (or otherwise manipulate):
On a POSIX system with gcc installed, this might generate:
% scons
scons: Reading SConscript files ...
{ 'BUILDERS': {},
'CONFIGUREDIR': '#/.sconf_temp',
'CONFIGURELOG': '#/config.log',
'CPPSUFFIXES': [ '.c',
'.C',
'.cxx',
'.cpp',
'.c++',
'.cc',
'.h',
'.H',
'.hxx',
'.hpp',
'.hh',
'.F',
'.fpp',
'.FPP',
'.m',
'.mm',
'.S',
'.spp',
'.SPP'],
'DSUFFIXES': ['.d'],
'Dir': <SCons.Defaults.Variable_Method_Caller instance at 0xb7c43bec>,
'Dirs': <SCons.Defaults.Variable_Method_Caller instance at 0xb7c43c0c>,
'ENV': {'PATH': '/usr/local/bin:/opt/bin:/bin:/usr/bin'},
'ESCAPE': <function escape at 0xb7b66c34>,
'File': <SCons.Defaults.Variable_Method_Caller instance at 0xb7c43c2c>,
'IDLSUFFIXES': ['.idl', '.IDL'],
'INSTALL': <function installFunc at 0xb7c41f0c>,
'INSTALLSTR': <function installStr at 0xb7c41f44>,
'LATEXSUFFIXES': ['.tex', '.ltx', '.latex'],
'LIBPREFIX': 'lib',
'LIBPREFIXES': '$LIBPREFIX',
'LIBSUFFIX': '.a',
'LIBSUFFIXES': ['$LIBSUFFIX', '$SHLIBSUFFIX'],
'MAXLINELENGTH': 128072,
'OBJPREFIX': '',
'OBJSUFFIX': '.o',
'PLATFORM': 'posix',
'PROGPREFIX': '',
'PROGSUFFIX': '',
'PSPAWN': <function piped_env_spawn at 0xb7b66fb4>,
'RDirs': <SCons.Defaults.Variable_Method_Caller instance at 0xb7c43c4c>,
'SCANNERS': [],
'SHELL': 'sh',
'SHLIBPREFIX': '$LIBPREFIX',
'SHLIBSUFFIX': '.so',
'SHOBJPREFIX': '$OBJPREFIX',
'SHOBJSUFFIX': '$OBJSUFFIX',
'SPAWN': <function spawnvpe_spawn at 0xb7b66a74>,
'TEMPFILE': <class SCons.Platform.TempFileMunge at 0xb7bd37ac>,
'TEMPFILEPREFIX': '@',
'TOOLS': [],
'_CPPDEFFLAGS': '${_defines(CPPDEFPREFIX, CPPDEFINES, CPPDEFSUFFIX, __env__)}',
'_CPPINCFLAGS': '$( ${_concat(INCPREFIX, CPPPATH, INCSUFFIX, __env__, RDirs, TARGET, SOURCE)} $)',
'_LIBDIRFLAGS': '$( ${_concat(LIBDIRPREFIX, LIBPATH, LIBDIRSUFFIX, __env__, RDirs, TARGET, SOURCE)} $)',
'_LIBFLAGS': '${_concat(LIBLINKPREFIX, LIBS, LIBLINKSUFFIX, __env__)}',
'__RPATH': '$_RPATH',
'_concat': <function _concat at 0xb7c41fb4>,
'_defines': <function _defines at 0xb7c47064>,
'_installStr': <function installStr at 0xb7c41f44>,
'_stripixes': <function _stripixes at 0xb7c4702c>}
scons: done reading SConscript files.
scons: Building targets ...
scons: `.' is up to date.
scons: done building targets.
|
On a Windows system with Visual C++ the output might look like:
C:\>scons
scons: Reading SConscript files ...
{ 'BUILDERS': {'Object': <SCons.Builder.CompositeBuilder instance at 0xb7b6024c>, 'SharedObject': <SCons.Builder.CompositeBuilder instance at 0xb7b603cc>, 'StaticObject': <SCons.Builder.CompositeBuilder instance at 0xb7b6024c>, 'PCH': <SCons.Builder.BuilderBase instance at 0xb7bd2eac>, 'RES': <SCons.Builder.BuilderBase instance at 0xb7b596ec>},
'CC': 'cl',
'CCCOM': <SCons.Action.FunctionAction instance at 0xb7b6086c>,
'CCCOMFLAGS': '$CPPFLAGS $_CPPDEFFLAGS $_CPPINCFLAGS /c $SOURCES /Fo$TARGET $CCPCHFLAGS $CCPDBFLAGS',
'CCFLAGS': ['/nologo'],
'CCPCHFLAGS': ['${(PCH and "/Yu%s /Fp%s"%(PCHSTOP or "",File(PCH))) or ""}'],
'CCPDBFLAGS': ['${(PDB and "/Z7") or ""}'],
'CFILESUFFIX': '.c',
'CFLAGS': [],
'CONFIGUREDIR': '#/.sconf_temp',
'CONFIGURELOG': '#/config.log',
'CPPDEFPREFIX': '/D',
'CPPDEFSUFFIX': '',
'CPPSUFFIXES': [ '.c',
'.C',
'.cxx',
'.cpp',
'.c++',
'.cc',
'.h',
'.H',
'.hxx',
'.hpp',
'.hh',
'.F',
'.fpp',
'.FPP',
'.m',
'.mm',
'.S',
'.spp',
'.SPP'],
'CXX': '$CC',
'CXXCOM': '$CXX $CXXFLAGS $CCCOMFLAGS',
'CXXFILESUFFIX': '.cc',
'CXXFLAGS': ['$CCFLAGS', '$(', '/TP', '$)'],
'DSUFFIXES': ['.d'],
'Dir': <SCons.Defaults.Variable_Method_Caller instance at 0xb7c58bec>,
'Dirs': <SCons.Defaults.Variable_Method_Caller instance at 0xb7c58c0c>,
'ENV': { 'INCLUDE': 'C:\\Program Files\\Microsoft Visual Studio/VC98\\include',
'LIB': 'C:\\Program Files\\Microsoft Visual Studio/VC98\\lib',
'PATH': 'C:\\Program Files\\Microsoft Visual Studio\\Common\\tools\\WIN95;C:\\Program Files\\Microsoft Visual Studio\\Common\\MSDev98\\bin;C:\\Program Files\\Microsoft Visual Studio\\Common\\tools;C:\\Program Files\\Microsoft Visual Studio/VC98\\bin',
'PATHEXT': '.COM;.EXE;.BAT;.CMD',
'SystemRoot': 'C:/WINDOWS'},
'ESCAPE': <function escape at 0xb7bc917c>,
'File': <SCons.Defaults.Variable_Method_Caller instance at 0xb7c58c2c>,
'IDLSUFFIXES': ['.idl', '.IDL'],
'INCPREFIX': '/I',
'INCSUFFIX': '',
'INSTALL': <function installFunc at 0xb7c56f0c>,
'INSTALLSTR': <function installStr at 0xb7c56f44>,
'LATEXSUFFIXES': ['.tex', '.ltx', '.latex'],
'LIBPREFIX': '',
'LIBPREFIXES': ['$LIBPREFIX'],
'LIBSUFFIX': '.lib',
'LIBSUFFIXES': ['$LIBSUFFIX'],
'MAXLINELENGTH': 2048,
'MSVS': {'VERSION': '6.0', 'VERSIONS': ['6.0']},
'MSVS_VERSION': '6.0',
'OBJPREFIX': '',
'OBJSUFFIX': '.obj',
'PCHCOM': '$CXX $CXXFLAGS $CPPFLAGS $_CPPDEFFLAGS $_CPPINCFLAGS /c $SOURCES /Fo${TARGETS[1]} /Yc$PCHSTOP /Fp${TARGETS[0]} $CCPDBFLAGS $PCHPDBFLAGS',
'PCHPDBFLAGS': ['${(PDB and "/Yd") or ""}'],
'PLATFORM': 'win32',
'PROGPREFIX': '',
'PROGSUFFIX': '.exe',
'PSPAWN': <function piped_spawn at 0xb7bc90d4>,
'RC': 'rc',
'RCCOM': '$RC $_CPPDEFFLAGS $_CPPINCFLAGS $RCFLAGS /fo$TARGET $SOURCES',
'RCFLAGS': [],
'RDirs': <SCons.Defaults.Variable_Method_Caller instance at 0xb7c58c4c>,
'SCANNERS': [],
'SHCC': '$CC',
'SHCCCOM': <SCons.Action.FunctionAction instance at 0xb7b608cc>,
'SHCCFLAGS': ['$CCFLAGS'],
'SHCFLAGS': ['$CFLAGS'],
'SHCXX': '$CXX',
'SHCXXCOM': '$SHCXX $SHCXXFLAGS $CCCOMFLAGS',
'SHCXXFLAGS': ['$CXXFLAGS'],
'SHELL': None,
'SHLIBPREFIX': '',
'SHLIBSUFFIX': '.dll',
'SHOBJPREFIX': '$OBJPREFIX',
'SHOBJSUFFIX': '$OBJSUFFIX',
'SPAWN': <function spawn at 0xb7bc9144>,
'STATIC_AND_SHARED_OBJECTS_ARE_THE_SAME': 1,
'TEMPFILE': <class SCons.Platform.TempFileMunge at 0xb7be87ac>,
'TEMPFILEPREFIX': '@',
'TOOLS': ['msvc'],
'_CPPDEFFLAGS': '${_defines(CPPDEFPREFIX, CPPDEFINES, CPPDEFSUFFIX, __env__)}',
'_CPPINCFLAGS': '$( ${_concat(INCPREFIX, CPPPATH, INCSUFFIX, __env__, RDirs, TARGET, SOURCE)} $)',
'_LIBDIRFLAGS': '$( ${_concat(LIBDIRPREFIX, LIBPATH, LIBDIRSUFFIX, __env__, RDirs, TARGET, SOURCE)} $)',
'_LIBFLAGS': '${_concat(LIBLINKPREFIX, LIBS, LIBLINKSUFFIX, __env__)}',
'_concat': <function _concat at 0xb7c56fb4>,
'_defines': <function _defines at 0xb7c5c064>,
'_installStr': <function installStr at 0xb7c56f44>,
'_stripixes': <function _stripixes at 0xb7c5c02c>}
scons: done reading SConscript files.
scons: Building targets ...
scons: `.' is up to date.
scons: done building targets.
|
The construction environments in these examples have actually been restricted to just gcc and Visual C++, respectively. In a real-life situation, the construction environments will likely contain a great many more variables.
To make it easier to see just what you're interested in, the Dump method allows you to specify a specific constrcution variable that you want to disply. For example, it's not unusual to want to verify the external environment used to execute build commands, to make sure that the PATH and other environment variables are set up the way they should be. You can do this as follows:
Which might display the following when executed on a POSIX system:
% scons
scons: Reading SConscript files ...
{'PATH': '/usr/local/bin:/opt/bin:/bin:/usr/bin'}
scons: done reading SConscript files.
scons: Building targets ...
scons: `.' is up to date.
scons: done building targets.
|
And the following when executed on a Windows system:
C:\>scons
scons: Reading SConscript files ...
{ 'INCLUDE': 'C:\\Program Files\\Microsoft Visual Studio/VC98\\include',
'LIB': 'C:\\Program Files\\Microsoft Visual Studio/VC98\\lib',
'PATH': 'C:\\Program Files\\Microsoft Visual Studio\\Common\\tools\\WIN95;C:\\Program Files\\Microsoft Visual Studio\\Common\\MSDev98\\bin;C:\\Program Files\\Microsoft Visual Studio\\Common\\tools;C:\\Program Files\\Microsoft Visual Studio/VC98\\bin',
'PATHEXT': '.COM;.EXE;.BAT;.CMD',
'SystemRoot': 'C:/WINDOWS'}
scons: done reading SConscript files.
scons: Building targets ...
scons: `.' is up to date.
scons: done building targets.
|
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