def get_default_compiler(osname=None, platform=None):
    """Determine the default compiler to use for the given platform.

    osname should be one of the standard Python OS names (i.e. the
    ones returned by os.name) and platform the common value
    returned by sys.platform for the platform in question.

    The default values are os.name and sys.platform in case the
    parameters are not given.
    """
    if osname is None:
        osname = os.name
    if platform is None:
        platform = sys.platform
    for pattern, compiler in _default_compilers:
        if (
            re.match(pattern, platform) is not None
            or re.match(pattern, osname) is not None
        ):
            return compiler
    # Default to Unix compiler
    return 'unix'
Determine the default compiler to use for the given platform.

    osname should be one of the standard Python OS names (i.e. the
    ones returned by os.name) and platform the common value
    returned by sys.platform for the platform in question.

    The default values are os.name and sys.platform in case the
    parameters are not given.
    
product/gradle-plugin/src/main/python/setuptools/_distutils/ccompiler.py