src/v8/gypfiles/detect_v8_host_arch.py

#!/usr/bin/env python
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"""Outputs host CPU architecture in format recognized by gyp."""

import platform
import re
import sys


def main():
  print DoMain([])
  return 0

def DoMain(_):
  """Hook to be called from gyp without starting a separate python
  interpreter."""
  host_arch = platform.machine()
  host_system = platform.system();

  # 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 == 'aarch64':
    host_arch = 'arm64'
  elif host_arch == 'mips64':
    host_arch = 'mips64el'
  elif host_arch.startswith('mips'):
    host_arch = 'mipsel'

  # Under AIX the value returned by platform.machine is not
  # the best indicator of the host architecture
  # AIX 6.1 which is the lowest level supported only provides
  # a 64 bit kernel
  if host_system == 'AIX':
    host_arch = 'ppc64'

  # 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'

  return host_arch

if __name__ == '__main__':
  sys.exit(main())