dart-sdk/build/detect_host_arch.py

#!/usr/bin/env python3
# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Outputs host CPU architecture in format recognized by gyp."""

import platform
import re
import sys


def HostArch():
    """Returns the host architecture with a predictable string."""
    host_arch = platform.machine()

    # Convert machine type to format recognized by gyp.
    if re.match(r'i.86', host_arch) or host_arch == 'i86pc':
        host_arch = 'ia32'
    elif host_arch in ['x86_64', 'amd64']:
        host_arch = 'x64'
    elif host_arch.startswith('arm'):
        host_arch = 'arm'
    elif host_arch.startswith('aarch64'):
        host_arch = 'arm64'
    elif host_arch.startswith('mips'):
        host_arch = 'mips'
    elif host_arch.startswith('ppc'):
        host_arch = 'ppc'
    elif host_arch.startswith('s390'):
        host_arch = 's390'

    # platform.machine is based on running kernel. It's possible to use 64-bit
    # kernel with 32-bit userland, e.g. to give linker slightly more memory.
    # Distinguish between different userland bitness by querying
    # the python binary.
    if host_arch == 'x64' and platform.architecture()[0] == '32bit':
        host_arch = 'ia32'
    if host_arch == 'arm64' and platform.architecture()[0] == '32bit':
        host_arch = 'arm'

    return host_arch


def DoMain(_):
    """Hook to be called from gyp without starting a separate python
  interpreter."""
    return HostArch()


if __name__ == '__main__':
    print(DoMain([]))