def query_vcvarsall(version, arch="x86"):
    """Launch vcvarsall.bat and read the settings from its environment"""
    vcvarsall = find_vcvarsall(version)
    interesting = {"include", "lib", "libpath", "path"}
    result = {}

    if vcvarsall is None:
        raise DistutilsPlatformError("Unable to find vcvarsall.bat")
    log.debug("Calling 'vcvarsall.bat %s' (version=%s)", arch, version)
    popen = subprocess.Popen(
        '"{}" {} & set'.format(vcvarsall, arch),
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
    )
    try:
        stdout, stderr = popen.communicate()
        if popen.wait() != 0:
            raise DistutilsPlatformError(stderr.decode("mbcs"))

        stdout = stdout.decode("mbcs")
        for line in stdout.split("\n"):
            line = Reg.convert_mbcs(line)
            if '=' not in line:
                continue
            line = line.strip()
            key, value = line.split('=', 1)
            key = key.lower()
            if key in interesting:
                if value.endswith(os.pathsep):
                    value = value[:-1]
                result[key] = removeDuplicates(value)

    finally:
        popen.stdout.close()
        popen.stderr.close()

    if len(result) != len(interesting):
        raise ValueError(str(list(result.keys())))

    return result
Launch vcvarsall.bat and read the settings from its environment
product/gradle-plugin/src/main/python/setuptools/_distutils/msvc9compiler.py