def test_apple_bitcode(self):
        '''
        Test that -fembed-bitcode is correctly added while compiling and
        -bitcode_bundle is added while linking when b_bitcode is true and not
        when it is false.  This can't be an ordinary test case because we need
        to inspect the compiler database.
        '''
        testdir = os.path.join(self.platform_test_dir, '7 bitcode')
        env = get_fake_env(testdir, self.builddir, self.prefix)
        cc = detect_c_compiler(env, MachineChoice.HOST)
        if cc.id != 'clang':
            raise unittest.SkipTest('Not using Clang on OSX')
        # Try with bitcode enabled
        out = self.init(testdir, extra_args='-Db_bitcode=true')
        # Warning was printed
        self.assertRegex(out, 'WARNING:.*b_bitcode')
        # Compiler options were added
        for compdb in self.get_compdb():
            if 'module' in compdb['file']:
                self.assertNotIn('-fembed-bitcode', compdb['command'])
            else:
                self.assertIn('-fembed-bitcode', compdb['command'])
        build_ninja = os.path.join(self.builddir, 'build.ninja')
        # Linker options were added
        with open(build_ninja, encoding='utf-8') as f:
            contents = f.read()
            m = re.search('LINK_ARGS =.*-bitcode_bundle', contents)
        self.assertIsNotNone(m, msg=contents)
        # Try with bitcode disabled
        self.setconf('-Db_bitcode=false')
        # Regenerate build
        self.build()
        for compdb in self.get_compdb():
            self.assertNotIn('-fembed-bitcode', compdb['command'])
        build_ninja = os.path.join(self.builddir, 'build.ninja')
        with open(build_ninja, encoding='utf-8') as f:
            contents = f.read()
            m = re.search('LINK_ARGS =.*-bitcode_bundle', contents)
        self.assertIsNone(m, msg=contents)

        Test that -fembed-bitcode is correctly added while compiling and
        -bitcode_bundle is added while linking when b_bitcode is true and not
        when it is false.  This can't be an ordinary test case because we need
        to inspect the compiler database.
        
unittests/darwintests.py