def check_config_h():

    """Check if the current Python installation (specifically, pyconfig.h)
    appears amenable to building extensions with GCC.  Returns a tuple
    (status, details), where 'status' is one of the following constants:
      CONFIG_H_OK
        all is well, go ahead and compile
      CONFIG_H_NOTOK
        doesn't look good
      CONFIG_H_UNCERTAIN
        not sure -- unable to read pyconfig.h
    'details' is a human-readable string explaining the situation.

    Note there are two ways to conclude "OK": either 'sys.version' contains
    the string "GCC" (implying that this Python was built with GCC), or the
    installed "pyconfig.h" contains the string "__GNUC__".
    """

    # XXX since this function also checks sys.version, it's not strictly a
    # "pyconfig.h" check -- should probably be renamed...

    from distutils import sysconfig
    import string
    # if sys.version contains GCC then python was compiled with
    # GCC, and the pyconfig.h file should be OK
    if string.find(sys.version,"GCC") >= 0:
        return (CONFIG_H_OK, "sys.version mentions 'GCC'")

    fn = sysconfig.get_config_h_filename()
    try:
        # It would probably better to read single lines to search.
        # But we do this only once, and it is fast enough
        f = open(fn)
        s = f.read()
        f.close()

    except __HOLE__, exc:
        # if we can't read this file, we cannot say it is wrong
        # the compiler will complain later about this file as missing
        return (CONFIG_H_UNCERTAIN,
                "couldn't read '%s': %s" % (fn, exc.strerror))

    else:
        # "pyconfig.h" contains an "#ifdef __GNUC__" or something similar
        if string.find(s,"__GNUC__") >= 0:
            return (CONFIG_H_OK, "'%s' mentions '__GNUC__'" % fn)
        else:
            return (CONFIG_H_NOTOK, "'%s' does not mention '__GNUC__'" % fn)
dataset/ETHPy150Open babble/babble/include/jython/Lib/distutils/emxccompiler.py/check_config_h