pyobjc_setup.py 文件源码

def get_sdk_level():
    cflags = get_config_var('CFLAGS')
    cflags = shlex.split(cflags)
    for i, val in enumerate(cflags):
        if val == '-isysroot':
            sdk = cflags[i+1]
            break
    else:
        return None

    if sdk == '/':
        return get_os_level()

    sdk = os.path.basename(sdk)
    assert sdk.startswith('MacOSX')
    assert sdk.endswith('.sdk')
    return sdk[6:-4]