def get_ext_outputs(self):
        """Get a list of relative paths to C extensions in the output distro"""

        all_outputs = []
        ext_outputs = []

        paths = {self.bdist_dir: ''}
        for base, dirs, files in sorted_walk(self.bdist_dir):
            for filename in files:
                if os.path.splitext(filename)[1].lower() in NATIVE_EXTENSIONS:
                    all_outputs.append(paths[base] + filename)
            for filename in dirs:
                paths[os.path.join(base, filename)] = paths[base] + filename + '/'

        if self.distribution.has_ext_modules():
            build_cmd = self.get_finalized_command('build_ext')
            for ext in build_cmd.extensions:
                if isinstance(ext, Library):
                    continue
                fullname = build_cmd.get_ext_fullname(ext.name)
                filename = build_cmd.get_ext_filename(fullname)
                if not os.path.basename(filename).startswith('dl-'):
                    if os.path.exists(os.path.join(self.bdist_dir, filename)):
                        ext_outputs.append(filename)

        return all_outputs, ext_outputs
Get a list of relative paths to C extensions in the output distro
product/gradle-plugin/src/main/python/setuptools/command/bdist_egg.py