setup.py 文件源码

def ask_supports_thread():
    from distutils.core import Distribution
    from distutils.sysconfig import get_config_vars
    get_config_vars()      # workaround for a bug of distutils, e.g. on OS/X
    config = Distribution().get_command_obj('config')
    ok = config.try_compile('__thread int some_threadlocal_variable_42;')
    if ok:
        define_macros.append(('USE__THREAD', None))
    else:
        ok1 = config.try_compile('int some_regular_variable_42;')
        if not ok1:
            no_working_compiler_found()
        sys.stderr.write("Note: will not use '__thread' in the C code\n")
        sys.stderr.write("The above error message can be safely ignored\n")