Python distutils.sysconfig.get_config_var() Examples

def test_sysconfig_compiler_vars(self):
        # On OS X, binary installers support extension module building on
        # various levels of the operating system with differing Xcode
        # configurations.  This requires customization of some of the
        # compiler configuration directives to suit the environment on
        # the installed machine.  Some of these customizations may require
        # running external programs and, so, are deferred until needed by
        # the first extension module build.  With Python 3.3, only
        # the Distutils version of sysconfig is used for extension module
        # builds, which happens earlier in the Distutils tests.  This may
        # cause the following tests to fail since no tests have caused
        # the global version of sysconfig to call the customization yet.
        # The solution for now is to simply skip this test in this case.
        # The longer-term solution is to only have one version of sysconfig.

        import sysconfig as global_sysconfig
        if sysconfig.get_config_var('CUSTOMIZED_OSX_COMPILER'):
            self.skipTest('compiler flags customized')
        self.assertEqual(global_sysconfig.get_config_var('LDSHARED'), sysconfig.get_config_var('LDSHARED'))
        self.assertEqual(global_sysconfig.get_config_var('CC'), sysconfig.get_config_var('CC')) 

def get_tests(config={}):
    tests = []
    tests += list_test_cases(RSATest)
    try:
        from Crypto.PublicKey import _fastmath
        tests += list_test_cases(RSAFastMathTest)
    except ImportError:
        from distutils.sysconfig import get_config_var
        import inspect
        _fm_path = os.path.normpath(os.path.dirname(os.path.abspath(
            inspect.getfile(inspect.currentframe())))
            +"/../../PublicKey/_fastmath"+get_config_var("SO"))
        if os.path.exists(_fm_path):
            raise ImportError("While the _fastmath module exists, importing "+
                "it failed. This may point to the gmp or mpir shared library "+
                "not being in the path. _fastmath was found at "+_fm_path)
    if config.get('slow_tests',1):
        tests += list_test_cases(RSASlowMathTest)
    return tests 

def get_tests(config={}):
    tests = []
    tests += list_test_cases(DSATest)
    try:
        from Crypto.PublicKey import _fastmath
        tests += list_test_cases(DSAFastMathTest)
    except ImportError:
        from distutils.sysconfig import get_config_var
        import inspect
        _fm_path = os.path.normpath(os.path.dirname(os.path.abspath(
            inspect.getfile(inspect.currentframe())))
            +"/../../PublicKey/_fastmath"+get_config_var("SO"))
        if os.path.exists(_fm_path):
            raise ImportError("While the _fastmath module exists, importing "+
                "it failed. This may point to the gmp or mpir shared library "+
                "not being in the path. _fastmath was found at "+_fm_path)
    tests += list_test_cases(DSASlowMathTest)
    return tests 

def get_ext_filename(self, fullname):
        filename = _build_ext.get_ext_filename(self, fullname)
        if fullname in self.ext_map:
            ext = self.ext_map[fullname]
            use_abi3 = (
                six.PY3
                and getattr(ext, 'py_limited_api')
                and get_abi3_suffix()
            )
            if use_abi3:
                so_ext = get_config_var('EXT_SUFFIX')
                filename = filename[:-len(so_ext)]
                filename = filename + get_abi3_suffix()
            if isinstance(ext, Library):
                fn, ext = os.path.splitext(filename)
                return self.shlib_compiler.library_filename(fn, libtype)
            elif use_stubs and ext._links_to_dynamic:
                d, fn = os.path.split(filename)
                return os.path.join(d, 'dl-' + fn)
        return filename 

def _fixup_command(self, cmd):
        # When Python was build with --enable-shared, -L. is not good enough
        # to find the libpython<blah>.so.  This is because regrtest runs it
        # under a tempdir, not in the top level where the .so lives.  By the
        # time we've gotten here, Python's already been chdir'd to the
        # tempdir.
        #
        # To further add to the fun, we can't just add library_dirs to the
        # Extension() instance because that doesn't get plumbed through to the
        # final compiler command.
        if (sysconfig.get_config_var('Py_ENABLE_SHARED') and
            not sys.platform.startswith('win')):
            runshared = sysconfig.get_config_var('RUNSHARED')
            if runshared is None:
                cmd.library_dirs = ['.']
            else:
                name, equals, value = runshared.partition('=')
                cmd.library_dirs = value.split(os.pathsep) 

def get_ext_filename(self, fullname):
        filename = _build_ext.get_ext_filename(self, fullname)
        if fullname in self.ext_map:
            ext = self.ext_map[fullname]
            use_abi3 = (
                six.PY3
                and getattr(ext, 'py_limited_api')
                and get_abi3_suffix()
            )
            if use_abi3:
                so_ext = get_config_var('EXT_SUFFIX')
                filename = filename[:-len(so_ext)]
                filename = filename + get_abi3_suffix()
            if isinstance(ext, Library):
                fn, ext = os.path.splitext(filename)
                return self.shlib_compiler.library_filename(fn, libtype)
            elif use_stubs and ext._links_to_dynamic:
                d, fn = os.path.split(filename)
                return os.path.join(d, 'dl-' + fn)
        return filename 

def get_ext_filename(self, fullname):
        filename = _build_ext.get_ext_filename(self, fullname)
        if fullname in self.ext_map:
            ext = self.ext_map[fullname]
            use_abi3 = (
                six.PY3
                and getattr(ext, 'py_limited_api')
                and get_abi3_suffix()
            )
            if use_abi3:
                so_ext = get_config_var('EXT_SUFFIX')
                filename = filename[:-len(so_ext)]
                filename = filename + get_abi3_suffix()
            if isinstance(ext, Library):
                fn, ext = os.path.splitext(filename)
                return self.shlib_compiler.library_filename(fn, libtype)
            elif use_stubs and ext._links_to_dynamic:
                d, fn = os.path.split(filename)
                return os.path.join(d, 'dl-' + fn)
        return filename 

def runtime_library_dir_option(self, dir):
        # XXX Hackish, at the very least.  See Python bug #445902:
        # http://sourceforge.net/tracker/index.php
        #   ?func=detail&aid=445902&group_id=5470&atid=105470
        # Linkers on different platforms need different options to
        # specify that directories need to be added to the list of
        # directories searched for dependencies when a dynamic library
        # is sought.  GCC has to be told to pass the -R option through
        # to the linker, whereas other compilers just know this.
        # Other compilers may need something slightly different.  At
        # this time, there's no way to determine this information from
        # the configuration data stored in the Python installation, so
        # we use this hack.
        compiler = os.path.basename(sysconfig.get_config_var("CC"))
        if sys.platform[:6] == "darwin":
            # MacOSX's linker doesn't understand the -R flag at all
            return "-L" + dir
        elif sys.platform[:5] == "hp-ux":
            if self._is_gcc(compiler):
                return ["-Wl,+s", "-L" + dir]
            return ["+s", "-L" + dir]
        elif sys.platform[:7] == "irix646" or sys.platform[:6] == "osf1V5":
            return ["-rpath", dir]
        elif self._is_gcc(compiler):
            return "-Wl,-R" + dir
        else:
            return "-R" + dir 

def get_abi_tag():
    """Return the ABI tag based on SOABI (if available) or emulate SOABI
    (CPython 2, PyPy)."""
    soabi = get_config_var('SOABI')
    impl = get_abbr_impl()
    if not soabi and impl in ('cp', 'pp') and hasattr(sys, 'maxunicode'):
        d = ''
        m = ''
        u = ''
        if get_flag('Py_DEBUG',
                    lambda: hasattr(sys, 'gettotalrefcount'),
                    warn=(impl == 'cp')):
            d = 'd'
        if get_flag('WITH_PYMALLOC',
                    lambda: impl == 'cp',
                    warn=(impl == 'cp')):
            m = 'm'
        if get_flag('Py_UNICODE_SIZE',
                    lambda: sys.maxunicode == 0x10ffff,
                    expected=4,
                    warn=(impl == 'cp' and
                          sys.version_info < (3, 3))) \
                and sys.version_info < (3, 3):
            u = 'u'
        abi = '%s%s%s%s%s' % (impl, get_impl_ver(), d, m, u)
    elif soabi and soabi.startswith('cpython-'):
        abi = 'cp' + soabi.split('-')[1]
    elif soabi:
        abi = soabi.replace('.', '_').replace('-', '_')
    else:
        abi = None
    return abi 

def get_impl_ver():
    """Return implementation version."""
    impl_ver = get_config_var("py_version_nodot")
    if not impl_ver or get_abbr_impl() == 'pp':
        impl_ver = ''.join(map(str, get_impl_version_info()))
    return impl_ver 

def test_build_ext_path_with_os_sep(self):
        dist = Distribution({'name': 'UpdateManager'})
        cmd = build_ext(dist)
        cmd.ensure_finalized()
        ext = sysconfig.get_config_var("SO")
        ext_name = os.path.join('UpdateManager', 'fdsend')
        ext_path = cmd.get_ext_fullpath(ext_name)
        wanted = os.path.join(cmd.build_lib, 'UpdateManager', 'fdsend' + ext)
        self.assertEqual(ext_path, wanted) 

def pythonlib_dir():
    """return path where libpython* is."""
    if sys.platform == 'win32':
        return os.path.join(sys.prefix, "libs")
    else:
        return get_config_var('LIBDIR') 

def _spawn_posix(cmd, search_path=1, verbose=0, dry_run=0):
    log.info(' '.join(cmd))
    if dry_run:
        return
    exec_fn = search_path and os.execvp or os.execv
    exec_args = [cmd[0], cmd]
    if sys.platform == 'darwin':
        global _cfg_target, _cfg_target_split
        if _cfg_target is None:
            _cfg_target = sysconfig.get_config_var(
                                  'MACOSX_DEPLOYMENT_TARGET') or ''
            if _cfg_target:
                _cfg_target_split = [int(x) for x in _cfg_target.split('.')]
        if _cfg_target:
            # ensure that the deployment target of build process is not less
            # than that used when the interpreter was built. This ensures
            # extension modules are built with correct compatibility values
            cur_target = os.environ.get('MACOSX_DEPLOYMENT_TARGET', _cfg_target)
            if _cfg_target_split > [int(x) for x in cur_target.split('.')]:
                my_msg = ('$MACOSX_DEPLOYMENT_TARGET mismatch: '
                          'now "%s" but "%s" during configure'
                                % (cur_target, _cfg_target))
                raise DistutilsPlatformError(my_msg)
            env = dict(os.environ,
                       MACOSX_DEPLOYMENT_TARGET=cur_target)
            exec_fn = search_path and os.execvpe or os.execve
            exec_args.append(env)
    pid = os.fork()

    if pid == 0:  # in the child
        try:
            exec_fn(*exec_args)
        except OSError, e:
            sys.stderr.write("unable to execute %s: %s\n" %
                             (cmd[0], e.strerror))
            os._exit(1)

        sys.stderr.write("unable to execute %s for unknown reasons" % cmd[0])
        os._exit(1) 

def _get_source_filename():
    srcdir = sysconfig.get_config_var('srcdir')
    if srcdir is None:
        return os.path.join(sysconfig.project_base, 'Modules', 'xxmodule.c')
    return os.path.join(srcdir, 'Modules', 'xxmodule.c') 

def test_setuptools_compat(self):
        import distutils.core, distutils.extension, distutils.command.build_ext
        saved_ext = distutils.extension.Extension
        try:
            # on some platforms, it loads the deprecated "dl" module
            test_support.import_module('setuptools_build_ext', deprecated=True)

            # theses import patch Distutils' Extension class
            from setuptools_build_ext import build_ext as setuptools_build_ext
            from setuptools_extension import Extension

            etree_c = os.path.join(self.tmp_dir, 'lxml.etree.c')
            etree_ext = Extension('lxml.etree', [etree_c])
            dist = Distribution({'name': 'lxml', 'ext_modules': [etree_ext]})
            cmd = setuptools_build_ext(dist)
            cmd.ensure_finalized()
            cmd.inplace = 1
            cmd.distribution.package_dir = {'': 'src'}
            cmd.distribution.packages = ['lxml', 'lxml.html']
            curdir = os.getcwd()
            ext = sysconfig.get_config_var("SO")
            wanted = os.path.join(curdir, 'src', 'lxml', 'etree' + ext)
            path = cmd.get_ext_fullpath('lxml.etree')
            self.assertEqual(wanted, path)
        finally:
            # restoring Distutils' Extension class otherwise its broken
            distutils.extension.Extension = saved_ext
            distutils.core.Extension = saved_ext
            distutils.command.build_ext.Extension = saved_ext 

def setUp(self):
        self._backup_platform = sys.platform
        self._backup_get_config_var = sysconfig.get_config_var
        class CompilerWrapper(UnixCCompiler):
            def rpath_foo(self):
                return self.runtime_library_dir_option('/foo')
        self.cc = CompilerWrapper() 

def tearDown(self):
        sys.platform = self._backup_platform
        sysconfig.get_config_var = self._backup_get_config_var 

def get_abi_tag():
    """Return the ABI tag based on SOABI (if available) or emulate SOABI
    (CPython 2, PyPy)."""
    soabi = get_config_var('SOABI')
    impl = get_abbr_impl()
    if not soabi and impl in ('cp', 'pp') and hasattr(sys, 'maxunicode'):
        d = ''
        m = ''
        u = ''
        if get_flag('Py_DEBUG',
                    lambda: hasattr(sys, 'gettotalrefcount'),
                    warn=(impl == 'cp')):
            d = 'd'
        if get_flag('WITH_PYMALLOC',
                    lambda: impl == 'cp',
                    warn=(impl == 'cp')):
            m = 'm'
        if get_flag('Py_UNICODE_SIZE',
                    lambda: sys.maxunicode == 0x10ffff,
                    expected=4,
                    warn=(impl == 'cp' and
                          sys.version_info < (3, 3))) \
                and sys.version_info < (3, 3):
            u = 'u'
        abi = '%s%s%s%s%s' % (impl, get_impl_ver(), d, m, u)
    elif soabi and soabi.startswith('cpython-'):
        abi = 'cp' + soabi.split('-')[1]
    elif soabi:
        abi = soabi.replace('.', '_').replace('-', '_')
    else:
        abi = None
    return abi 

def get_flag(var, fallback, expected=True, warn=True):
    """Use a fallback method for determining SOABI flags if the needed config
    var is unset or unavailable."""
    val = get_config_var(var)
    if val is None:
        if warn:
            logger.debug("Config variable '%s' is unset, Python ABI tag may "
                         "be incorrect", var)
        return fallback()
    return val == expected 

def get_impl_ver():
    """Return implementation version."""
    impl_ver = get_config_var("py_version_nodot")
    if not impl_ver or get_abbr_impl() == 'pp':
        impl_ver = ''.join(map(str, get_impl_version_info()))
    return impl_ver 

def get_config_var(var):
    try:
        return sysconfig.get_config_var(var)
    except IOError as e:  # Issue #1074
        warnings.warn("{0}".format(e), RuntimeWarning)
        return None 

def get_abi_tag():
    """Return the ABI tag based on SOABI (if available) or emulate SOABI
    (CPython 2, PyPy)."""
    soabi = get_config_var('SOABI')
    impl = get_abbr_impl()
    if not soabi and impl in ('cp', 'pp') and hasattr(sys, 'maxunicode'):
        d = ''
        m = ''
        u = ''
        if get_flag('Py_DEBUG',
                    lambda: hasattr(sys, 'gettotalrefcount'),
                    warn=(impl == 'cp')):
            d = 'd'
        if get_flag('WITH_PYMALLOC',
                    lambda: impl == 'cp',
                    warn=(impl == 'cp')):
            m = 'm'
        if get_flag('Py_UNICODE_SIZE',
                    lambda: sys.maxunicode == 0x10ffff,
                    expected=4,
                    warn=(impl == 'cp' and
                          sys.version_info < (3, 3))) \
                and sys.version_info < (3, 3):
            u = 'u'
        abi = '%s%s%s%s%s' % (impl, get_impl_ver(), d, m, u)
    elif soabi and soabi.startswith('cpython-'):
        abi = 'cp' + soabi.split('-')[1]
    elif soabi:
        abi = soabi.replace('.', '_').replace('-', '_')
    else:
        abi = None
    return abi 

def get_flag(var, fallback, expected=True, warn=True):
    """Use a fallback method for determining SOABI flags if the needed config
    var is unset or unavailable."""
    val = get_config_var(var)
    if val is None:
        if warn:
            warnings.warn("Config variable '{0}' is unset, Python ABI tag may "
                          "be incorrect".format(var), RuntimeWarning, 2)
        return fallback()
    return val == expected 

def get_impl_ver():
    """Return implementation version."""
    impl_ver = get_config_var("py_version_nodot")
    if not impl_ver or get_abbr_impl() == 'pp':
        impl_ver = ''.join(map(str, get_impl_version_info()))
    return impl_ver 

def get_config_var(var):
    try:
        return sysconfig.get_config_var(var)
    except IOError as e:  # pip Issue #1074
        warnings.warn("{0}".format(e), RuntimeWarning)
        return None 

def pythonlib_dir():
    """return path where libpython* is."""
    if sys.platform == 'win32':
        return os.path.join(sys.prefix, "libs")
    else:
        return get_config_var('LIBDIR') 

def get_ext_filename(self, ext_name):
        r"""Convert the name of an extension (eg. "foo.bar") into the name
        of the file from which it will be loaded (eg. "foo/bar.so", or
        "foo\bar.pyd").
        """
        from distutils.sysconfig import get_config_var
        ext_path = string.split(ext_name, '.')
        # OS/2 has an 8 character module (extension) limit :-(
        if os.name == "os2":
            ext_path[len(ext_path) - 1] = ext_path[len(ext_path) - 1][:8]
        # extensions in debug_mode are named 'module_d.pyd' under windows
        so_ext = get_config_var('SO')
        if os.name == 'nt' and self.debug:
            return os.path.join(*ext_path) + '_d' + so_ext
        return os.path.join(*ext_path) + so_ext 

def _make_ext_name(modname):
    if os.name == 'nt' and sys.executable.endswith('_d.exe'):
        modname += '_d'
    return modname + sysconfig.get_config_var('SO') 

def test_osx_explicit_ldshared(self):
        # Issue #18080:
        # ensure that setting CC env variable does not change
        #   explicit LDSHARED setting for linker
        def gcv(v):
            if v == 'LDSHARED':
                return 'gcc-4.2 -bundle -undefined dynamic_lookup '
            return 'gcc-4.2'
        sysconfig.get_config_var = gcv
        with EnvironmentVarGuard() as env:
            env['CC'] = 'my_cc'
            env['LDSHARED'] = 'my_ld -bundle -dynamic'
            sysconfig.customize_compiler(self.cc)
        self.assertEqual(self.cc.linker_so[0], 'my_ld') 

def python_is_optimized():
    """Find if Python was built with optimizations."""
    # We don't have sysconfig on Py2.6:
    import sysconfig
    cflags = sysconfig.get_config_var('PY_CFLAGS') or ''
    final_opt = ""
    for opt in cflags.split():
        if opt.startswith('-O'):
            final_opt = opt
    return final_opt != '' and final_opt != '-O0'