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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: """ import _imp import os import re import sys import fnmatch from .errors import DistutilsPlatformError from .util import get_platform, get_host_platform # 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) BASE_PREFIX = os.path.normpath(sys.base_prefix) BASE_EXEC_PREFIX = os.path.normpath(sys.base_exec_prefix) # Path to the base directory of the project. On Windows the binary may # live in project/PCbuild/win32 or project/PCbuild/amd64. # set for cross builds if "_PYTHON_PROJECT_BASE" in os.environ: project_base = os.path.abspath(os.environ["_PYTHON_PROJECT_BASE"]) else: 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() # 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. def _is_python_source_dir(d): for fn in ("Setup", "Setup.local"): if os.path.isfile(os.path.join(d, "Modules", fn)): return True return False _sys_home = getattr(sys, '_home', None) if os.name == 'nt': def _fix_pcbuild(d): if d and os.path.normcase(d).startswith( os.path.normcase(os.path.join(PREFIX, "PCbuild"))): return PREFIX return d project_base = _fix_pcbuild(project_base) _sys_home = _fix_pcbuild(_sys_home) def _python_build(): if _sys_home: return _is_python_source_dir(_sys_home) return _is_python_source_dir(project_base) python_build = _python_build() # Calculate the build qualifier flags if they are defined. Adding the flags # to the include and lib directories only makes sense for an installation, not # an in-source build. build_flags = '' try: if not python_build: build_flags = sys.abiflags except AttributeError: # It's not a configure-based build, so the sys module doesn't have # this attribute, which is fine. pass 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 '%d.%d' % sys.version_info[:2] 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.base_prefix or sys.base_exec_prefix -- i.e., ignore 'plat_specific'. """ if prefix is None: prefix = plat_specific and BASE_EXEC_PREFIX or BASE_PREFIX if os.name == "posix": if python_build: # Assume the executable is in the build directory. The # pyconfig.h file should be in the same directory. Since # the build directory may not be the source directory, we # must use "srcdir" from the makefile to find the "Include" # directory. if plat_specific: return _sys_home or project_base else: incdir = os.path.join(get_config_var('srcdir'), 'Include') return os.path.normpath(incdir) python_dir = 'python' + get_python_version() + build_flags if not python_build and plat_specific: import sysconfig return sysconfig.get_path('platinclude') return os.path.join(prefix, "include", python_dir) elif os.name == "nt": if python_build: # Include both the include and PC dir to ensure we can find # pyconfig.h return (os.path.join(prefix, "include") + os.path.pathsep + os.path.join(prefix, "PC")) 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.base_prefix or sys.base_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: if standard_lib: prefix = plat_specific and BASE_EXEC_PREFIX or BASE_PREFIX else: 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 'VIRTUAL_ENV' not in os.environ and 'real_prefix' not in sys.__dict__ and sys.prefix == sys.base_prefix): return os.path.join(prefix, "lib", "python3", "dist-packages") else: return os.path.join(libpython, "site-packages") elif os.name == "nt": 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, ccshared, ldshared, shlib_suffix, ar, ar_flags, configure_cppflags, configure_cflags, configure_ldflags) = \ get_config_vars('CC', 'CXX', 'CFLAGS', 'CCSHARED', 'LDSHARED', 'SHLIB_SUFFIX', '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 'CFLAGS' in os.environ: cflags = cflags + ' ' + os.environ['CFLAGS'] ldshared = ldshared + ' ' + os.environ['CFLAGS'] elif configure_cflags: cflags = cflags + ' ' + configure_cflags 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, linker_exe=cc, archiver=archiver) compiler.shared_lib_extension = shlib_suffix 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(_sys_home or project_base, "PC") else: inc_dir = _sys_home or project_base else: inc_dir = get_python_inc(plat_specific=1) return os.path.join(inc_dir, 'pyconfig.h') def get_makefile_filename(): """Return full pathname of installed Makefile from the Python build.""" if python_build: return os.path.join(_sys_home or project_base, "Makefile") lib_dir = get_python_lib(plat_specific=0, standard_lib=1) config_file = 'config-{}{}'.format(get_python_version(), build_flags) if hasattr(sys.implementation, '_multiarch'): config_file += '-%s' % sys.implementation._multiarch return os.path.join(lib_dir, config_file, '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 True: 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(r"([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, errors="surrogateescape") if g is None: g = {} done = {} notdone = {} while True: 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('$$', '$') else: done[n] = v # Variables with a 'PY_' prefix in the makefile. These need to # be made available without that prefix through sysconfig. # Special care is needed to ensure that variable expansion works, even # if the expansion uses the name without a prefix. renamed_variables = ('CFLAGS', 'LDFLAGS', 'CPPFLAGS') # do variable interpolation here while notdone: for name in list(notdone): value = notdone[name] m = _findvar1_rx.search(value) or _findvar2_rx.search(value) if m: n = m.group(1) found = True if n in done: item = str(done[n]) elif n in notdone: # get it on a subsequent round found = False elif n in os.environ: # do it like make: fall back to environment item = os.environ[n] elif n in renamed_variables: if name.startswith('PY_') and name[3:] in renamed_variables: item = "" elif 'PY_' + n in notdone: found = False else: item = str(done['PY_' + n]) else: done[n] = item = "" if found: after = value[m.end():] value = value[:m.start()] + item + after if "$" in after: notdone[name] = value else: try: value = int(value) except ValueError: done[name] = value.strip() else: done[name] = value del notdone[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; just drop it since we can't deal del notdone[name] fp.close() # 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 True: 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 name = os.environ.get('_PYTHON_SYSCONFIGDATA_NAME', '_sysconfigdata_{abi}_{multiarch}'.format( abi=sys.abiflags, multiarch=getattr(sys.implementation, '_multiarch', ''), )) _temp = __import__(name, globals(), locals(), ['build_time_vars'], 0) build_time_vars = _temp.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['EXT_SUFFIX'] = _imp.extension_suffixes()[0] 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 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 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 # For backward compatibility, see issue19555 SO = _config_vars.get('EXT_SUFFIX') if SO is not None: _config_vars['SO'] = SO # Always convert srcdir to an absolute path srcdir = _config_vars.get('srcdir', project_base) if os.name == 'posix': if python_build: # If srcdir is a relative path (typically '.' or '..') # then it should be interpreted relative to the directory # containing Makefile. base = os.path.dirname(get_makefile_filename()) srcdir = os.path.join(base, srcdir) else: # srcdir is not meaningful since the installation is # spread about the filesystem. We choose the # directory containing the Makefile since we know it # exists. srcdir = os.path.dirname(get_makefile_filename()) _config_vars['srcdir'] = os.path.abspath(os.path.normpath(srcdir)) # Convert srcdir into an absolute path if it appears necessary. # Normally it is relative to the build directory. However, during # testing, for example, we might be running a non-installed python # from a different directory. if python_build and os.name == "posix": base = project_base if (not os.path.isabs(_config_vars['srcdir']) and base != os.getcwd()): # srcdir is relative and we are not in the same directory # as the executable. Assume executable is in the build # directory and make srcdir absolute. srcdir = os.path.join(base, _config_vars['srcdir']) _config_vars['srcdir'] = os.path.normpath(srcdir) # 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) """ if name == 'SO': import warnings warnings.warn('SO is deprecated, use EXT_SUFFIX', DeprecationWarning, 2) return get_config_vars().get(name)