gnu.py 文件源码

def get_flags_linker_so(self):
        opt = self.linker_so[1:]
        if sys.platform == 'darwin':
            target = os.environ.get('MACOSX_DEPLOYMENT_TARGET', None)
            # If MACOSX_DEPLOYMENT_TARGET is set, we simply trust the value
            # and leave it alone.  But, distutils will complain if the
            # environment's value is different from the one in the Python
            # Makefile used to build Python.  We let disutils handle this
            # error checking.
            if not target:
                # If MACOSX_DEPLOYMENT_TARGET is not set in the environment,
                # we try to get it first from the Python Makefile and then we
                # fall back to setting it to 10.3 to maximize the set of
                # versions we can work with.  This is a reasonable default
                # even when using the official Python dist and those derived
                # from it.
                import distutils.sysconfig as sc
                g = {}
                filename = sc.get_makefile_filename()
                sc.parse_makefile(filename, g)
                target = g.get('MACOSX_DEPLOYMENT_TARGET', '10.3')
                os.environ['MACOSX_DEPLOYMENT_TARGET'] = target
                if target == '10.3':
                    s = 'Env. variable MACOSX_DEPLOYMENT_TARGET set to 10.3'
                    warnings.warn(s)

            opt.extend(['-undefined', 'dynamic_lookup', '-bundle'])
        else:
            opt.append("-shared")
        if sys.platform.startswith('sunos'):
            # SunOS often has dynamically loaded symbols defined in the
            # static library libg2c.a  The linker doesn't like this.  To
            # ignore the problem, use the -mimpure-text flag.  It isn't
            # the safest thing, but seems to work. 'man gcc' says:
            # ".. Instead of using -mimpure-text, you should compile all
            #  source code with -fpic or -fPIC."
            opt.append('-mimpure-text')
        return opt