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The specific configuration variables available depend heavily on the platform and configuration. The values may be retrieved using get_config_var(name), and the list of variables is available via get_config_vars().keys(). Additional convenience functions are also available. Written by: Fred L. Drake, Jr. Email: """ __revision__ = "$Id$" import os import re import string import sys import fnmatch from distutils.errors import DistutilsPlatformError # These are needed in a couple of spots, so just compute them once. PREFIX = os.path.normpath(sys.prefix) EXEC_PREFIX = os.path.normpath(sys.exec_prefix) # Path to the base directory of the project. On Windows the binary may # live in project/PCBuild9. If we're dealing with an x64 Windows build, # it'll live in project/PCbuild/amd64. if sys.executable: project_base = os.path.dirname(os.path.abspath(sys.executable)) else: # sys.executable can be empty if argv[0] has been changed and Python is # unable to retrieve the real program name project_base = os.getcwd() if os.name == "nt" and "pcbuild" in project_base[-8:].lower(): project_base = os.path.abspath(os.path.join(project_base, os.path.pardir)) # PC/VS7.1 if os.name == "nt" and "\\pc\\v" in project_base[-10:].lower(): project_base = os.path.abspath(os.path.join(project_base, os.path.pardir, os.path.pardir)) # PC/AMD64 if os.name == "nt" and "\\pcbuild\\amd64" in project_base[-14:].lower(): project_base = os.path.abspath(os.path.join(project_base, os.path.pardir, os.path.pardir)) # set for cross builds if "_PYTHON_PROJECT_BASE" in os.environ: # this is the build directory, at least for posix project_base = os.path.normpath(os.environ["_PYTHON_PROJECT_BASE"]) # python_build: (Boolean) if true, we're either building Python or # building an extension with an un-installed Python, so we use # different (hard-wired) directories. # Setup.local is available for Makefile builds including VPATH builds, # Setup.dist is available on Windows def _python_build(): for fn in ("Setup.dist", "Setup.local"): if os.path.isfile(os.path.join(project_base, "Modules", fn)): return True return False python_build = _python_build() def get_python_version(): """Return a string containing the major and minor Python version, leaving off the patchlevel. Sample return values could be '1.5' or '2.2'. """ return sys.version[:3] def get_python_inc(plat_specific=0, prefix=None): """Return the directory containing installed Python header files. If 'plat_specific' is false (the default), this is the path to the non-platform-specific header files, i.e. Python.h and so on; otherwise, this is the path to platform-specific header files (namely pyconfig.h). If 'prefix' is supplied, use it instead of sys.prefix or sys.exec_prefix -- i.e., ignore 'plat_specific'. """ if os.name == "posix": if python_build: if sys.executable: buildir = os.path.dirname(sys.executable) else: # sys.executable can be empty if argv[0] has been changed # and Python is unable to retrieve the real program name buildir = os.getcwd() if plat_specific: # python.h is located in the buildir inc_dir = buildir else: # the source dir is relative to the buildir srcdir = os.path.abspath(os.path.join(buildir, get_config_var('srcdir'))) # Include is located in the srcdir inc_dir = os.path.join(srcdir, "Include") return inc_dir else: if not (prefix is None): return os.path.join(prefix, "include", "python" + get_python_version())+(sys.pydebug and "_d" or "") if plat_specific: return get_config_var('CONFINCLUDEPY') else: return get_config_var('INCLUDEPY') elif os.name == "nt": return os.path.join(prefix, "include") elif os.name == "os2": return os.path.join(prefix, "Include") else: raise DistutilsPlatformError( "I don't know where Python installs its C header files " "on platform '%s'" % os.name) def get_python_lib(plat_specific=0, standard_lib=0, prefix=None): """Return the directory containing the Python library (standard or site additions). If 'plat_specific' is true, return the directory containing platform-specific modules, i.e. any module from a non-pure-Python module distribution; otherwise, return the platform-shared library directory. If 'standard_lib' is true, return the directory containing standard Python library modules; otherwise, return the directory for site-specific modules. If 'prefix' is supplied, use it instead of sys.prefix or sys.exec_prefix -- i.e., ignore 'plat_specific'. """ is_default_prefix = not prefix or os.path.normpath(prefix) in ('/usr', '/usr/local') if prefix is None: prefix = plat_specific and EXEC_PREFIX or PREFIX if os.name == "posix": libpython = os.path.join(prefix, "lib", "python" + get_python_version()) if standard_lib: return libpython elif is_default_prefix and 'PYTHONUSERBASE' not in os.environ and 'real_prefix' not in sys.__dict__: return os.path.join(libpython, "dist-packages") else: return os.path.join(libpython, "site-packages") elif os.name == "nt": if standard_lib: return os.path.join(prefix, "Lib") else: if get_python_version() < "2.2": return prefix else: return os.path.join(prefix, "Lib", "site-packages") elif os.name == "os2": if standard_lib: return os.path.join(prefix, "Lib") else: return os.path.join(prefix, "Lib", "site-packages") else: raise DistutilsPlatformError( "I don't know where Python installs its library " "on platform '%s'" % os.name) def customize_compiler(compiler): """Do any platform-specific customization of a CCompiler instance. Mainly needed on Unix, so we can plug in the information that varies across Unices and is stored in Python's Makefile. """ if compiler.compiler_type == "unix": if sys.platform == "darwin": # Perform first-time customization of compiler-related # config vars on OS X now that we know we need a compiler. # This is primarily to support Pythons from binary # installers. The kind and paths to build tools on # the user system may vary significantly from the system # that Python itself was built on. Also the user OS # version and build tools may not support the same set # of CPU architectures for universal builds. global _config_vars # Use get_config_var() to ensure _config_vars is initialized. if not get_config_var('CUSTOMIZED_OSX_COMPILER'): import _osx_support _osx_support.customize_compiler(_config_vars) _config_vars['CUSTOMIZED_OSX_COMPILER'] = 'True' (cc, cxx, cflags, extra_cflags, basecflags, ccshared, ldshared, so_ext, ar, ar_flags, configure_cppflags, configure_cflags, configure_ldflags) = \ get_config_vars('CC', 'CXX', 'CFLAGS', 'EXTRA_CFLAGS', 'BASECFLAGS', 'CCSHARED', 'LDSHARED', 'SO', 'AR', 'ARFLAGS', 'CONFIGURE_CPPFLAGS', 'CONFIGURE_CFLAGS', 'CONFIGURE_LDFLAGS') if 'CC' in os.environ: newcc = os.environ['CC'] if (sys.platform == 'darwin' and 'LDSHARED' not in os.environ and ldshared.startswith(cc)): # On OS X, if CC is overridden, use that as the default # command for LDSHARED as well ldshared = newcc + ldshared[len(cc):] cc = newcc if 'CXX' in os.environ: cxx = os.environ['CXX'] if fnmatch.filter([cc, cxx], '*-4.[0-8]'): configure_cflags = configure_cflags.replace('-fstack-protector-strong', '-fstack-protector') ldshared = ldshared.replace('-fstack-protector-strong', '-fstack-protector') cflags = cflags.replace('-fstack-protector-strong', '-fstack-protector') if 'LDSHARED' in os.environ: ldshared = os.environ['LDSHARED'] if 'CPP' in os.environ: cpp = os.environ['CPP'] else: cpp = cc + " -E" # not always if 'LDFLAGS' in os.environ: ldshared = ldshared + ' ' + os.environ['LDFLAGS'] elif configure_ldflags: ldshared = ldshared + ' ' + configure_ldflags if 'BASECFLAGS' in os.environ: basecflags = os.environ['BASECFLAGS'] if 'CFLAGS' in os.environ: cflags = ' '.join(str(x) for x in (basecflags, os.environ['CFLAGS'], extra_cflags) if x) ldshared = ldshared + ' ' + os.environ['CFLAGS'] elif configure_cflags: cflags = ' '.join(str(x) for x in (basecflags, configure_cflags, extra_cflags) if x) ldshared = ldshared + ' ' + configure_cflags if 'CPPFLAGS' in os.environ: cpp = cpp + ' ' + os.environ['CPPFLAGS'] cflags = cflags + ' ' + os.environ['CPPFLAGS'] ldshared = ldshared + ' ' + os.environ['CPPFLAGS'] elif configure_cppflags: cpp = cpp + ' ' + configure_cppflags cflags = cflags + ' ' + configure_cppflags ldshared = ldshared + ' ' + configure_cppflags if 'AR' in os.environ: ar = os.environ['AR'] if 'ARFLAGS' in os.environ: archiver = ar + ' ' + os.environ['ARFLAGS'] else: archiver = ar + ' ' + ar_flags cc_cmd = cc + ' ' + cflags compiler.set_executables( preprocessor=cpp, compiler=cc_cmd, compiler_so=cc_cmd + ' ' + ccshared, compiler_cxx=cxx, linker_so=ldshared + ' ' + ccshared, linker_exe=cc, archiver=archiver) compiler.shared_lib_extension = so_ext def get_config_h_filename(): """Return full pathname of installed pyconfig.h file.""" if python_build: if os.name == "nt": inc_dir = os.path.join(project_base, "PC") else: inc_dir = project_base else: inc_dir = get_python_inc(plat_specific=1) if get_python_version() < '2.2': config_h = 'config.h' else: # The name of the config.h file changed in 2.2 config_h = 'pyconfig.h' return os.path.join(inc_dir, config_h) def get_makefile_filename(): """Return full pathname of installed Makefile from the Python build.""" if python_build: return os.path.join(project_base, "Makefile") lib_dir = get_python_lib(plat_specific=1, standard_lib=1) return os.path.join(get_config_var('LIBPL'), "Makefile") def parse_config_h(fp, g=None): """Parse a config.h-style file. A dictionary containing name/value pairs is returned. If an optional dictionary is passed in as the second argument, it is used instead of a new dictionary. """ if g is None: g = {} define_rx = re.compile("#define ([A-Z][A-Za-z0-9_]+) (.*)\n") undef_rx = re.compile("/[*] #undef ([A-Z][A-Za-z0-9_]+) [*]/\n") # while 1: line = fp.readline() if not line: break m = define_rx.match(line) if m: n, v = m.group(1, 2) try: v = int(v) except ValueError: pass g[n] = v else: m = undef_rx.match(line) if m: g[m.group(1)] = 0 return g # Regexes needed for parsing Makefile (and similar syntaxes, # like old-style Setup files). _variable_rx = re.compile("([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)") _findvar1_rx = re.compile(r"\$\(([A-Za-z][A-Za-z0-9_]*)\)") _findvar2_rx = re.compile(r"\${([A-Za-z][A-Za-z0-9_]*)}") def parse_makefile(fn, g=None): """Parse a Makefile-style file. A dictionary containing name/value pairs is returned. If an optional dictionary is passed in as the second argument, it is used instead of a new dictionary. """ from distutils.text_file import TextFile fp = TextFile(fn, strip_comments=1, skip_blanks=1, join_lines=1) if g is None: g = {} done = {} notdone = {} while 1: line = fp.readline() if line is None: # eof break m = _variable_rx.match(line) if m: n, v = m.group(1, 2) v = v.strip() # `$$' is a literal `$' in make tmpv = v.replace('$$', '') if "$" in tmpv: notdone[n] = v else: try: v = int(v) except ValueError: # insert literal `$' done[n] = v.replace('$$', '$') else: done[n] = v # do variable interpolation here variables = list(notdone.keys()) # Variables with a 'PY_' prefix in the makefile. These need to # be made available without that prefix through sysconfig. # Special care is needed to ensure that variable expansion works, even # if the expansion uses the name without a prefix. renamed_variables = ('CFLAGS', 'LDFLAGS', 'CPPFLAGS') while len(variables) > 0: for name in tuple(variables): value = notdone[name] m = _findvar1_rx.search(value) or _findvar2_rx.search(value) if m is not None: n = m.group(1) found = True if n in done: item = str(done[n]) elif n in notdone: # get it on a subsequent round found = False elif n in os.environ: # do it like make: fall back to environment item = os.environ[n] elif n in renamed_variables: if name.startswith('PY_') and name[3:] in renamed_variables: item = "" elif 'PY_' + n in notdone: found = False else: item = str(done['PY_' + n]) else: done[n] = item = "" if found: after = value[m.end():] value = value[:m.start()] + item + after if "$" in after: notdone[name] = value else: try: value = int(value) except ValueError: done[name] = value.strip() else: done[name] = value variables.remove(name) if name.startswith('PY_') \ and name[3:] in renamed_variables: name = name[3:] if name not in done: done[name] = value else: # bogus variable reference (e.g. "prefix=$/opt/python"); # just drop it since we can't deal done[name] = value variables.remove(name) # strip spurious spaces for k, v in done.items(): if isinstance(v, str): done[k] = v.strip() # save the results in the global dictionary g.update(done) return g def expand_makefile_vars(s, vars): """Expand Makefile-style variables -- "${foo}" or "$(foo)" -- in 'string' according to 'vars' (a dictionary mapping variable names to values). Variables not present in 'vars' are silently expanded to the empty string. The variable values in 'vars' should not contain further variable expansions; if 'vars' is the output of 'parse_makefile()', you're fine. Returns a variable-expanded version of 's'. """ # This algorithm does multiple expansion, so if vars['foo'] contains # "${bar}", it will expand ${foo} to ${bar}, and then expand # ${bar}... and so forth. This is fine as long as 'vars' comes from # 'parse_makefile()', which takes care of such expansions eagerly, # according to make's variable expansion semantics. while 1: m = _findvar1_rx.search(s) or _findvar2_rx.search(s) if m: (beg, end) = m.span() s = s[0:beg] + vars.get(m.group(1)) + s[end:] else: break return s _config_vars = None def _init_posix(): """Initialize the module as appropriate for POSIX systems.""" # _sysconfigdata is generated at build time, see the sysconfig module from _sysconfigdata import build_time_vars global _config_vars _config_vars = {} _config_vars.update(build_time_vars) def _init_nt(): """Initialize the module as appropriate for NT""" g = {} # set basic install directories g['LIBDEST'] = get_python_lib(plat_specific=0, standard_lib=1) g['BINLIBDEST'] = get_python_lib(plat_specific=1, standard_lib=1) # XXX hmmm.. a normal install puts include files here g['INCLUDEPY'] = get_python_inc(plat_specific=0) g['SO'] = '.pyd' g['EXE'] = ".exe" g['VERSION'] = get_python_version().replace(".", "") g['BINDIR'] = os.path.dirname(os.path.abspath(sys.executable)) global _config_vars _config_vars = g def _init_os2(): """Initialize the module as appropriate for OS/2""" g = {} # set basic install directories g['LIBDEST'] = get_python_lib(plat_specific=0, standard_lib=1) g['BINLIBDEST'] = get_python_lib(plat_specific=1, standard_lib=1) # XXX hmmm.. a normal install puts include files here g['INCLUDEPY'] = get_python_inc(plat_specific=0) g['SO'] = '.pyd' g['EXE'] = ".exe" global _config_vars _config_vars = g def get_config_vars(*args): """With no arguments, return a dictionary of all configuration variables relevant for the current platform. Generally this includes everything needed to build extensions and install both pure modules and extensions. On Unix, this means every variable defined in Python's installed Makefile; on Windows and Mac OS it's a much smaller set. With arguments, return a list of values that result from looking up each argument in the configuration variable dictionary. """ global _config_vars if _config_vars is None: func = globals().get("_init_" + os.name) if func: func() else: _config_vars = {} # Normalized versions of prefix and exec_prefix are handy to have; # in fact, these are the standard versions used most places in the # Distutils. _config_vars['prefix'] = PREFIX _config_vars['exec_prefix'] = EXEC_PREFIX # OS X platforms require special customization to handle # multi-architecture, multi-os-version installers if sys.platform == 'darwin': import _osx_support _osx_support.customize_config_vars(_config_vars) if args: vals = [] for name in args: vals.append(_config_vars.get(name)) return vals else: return _config_vars def get_config_var(name): """Return the value of a single variable using the dictionary returned by 'get_config_vars()'. Equivalent to get_config_vars().get(name) """ return get_config_vars().get(name)