build/compiler_version.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 """Compiler version checking tool for gcc
   7
   8 Print gcc version as XY if you are running gcc X.Y.*.
   9 This is used to tweak build flags for gcc 4.4.
  10 """
  11
  12 import os
  13 import re
  14 import subprocess
  15 import sys
  16
  17 def GetVersion(compiler):
  18   try:
  19     # Note that compiler could be something tricky like "distcc g++".
  20     compiler = compiler + " -dumpversion"
  21     pipe = subprocess.Popen(compiler, shell=True,
  22                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  23     gcc_output, gcc_error = pipe.communicate()
  24     if pipe.returncode:
  25       raise subprocess.CalledProcessError(pipe.returncode, compiler)
  26
  27     result = re.match(r"(\d+)\.(\d+)", gcc_output)
  28     return result.group(1) + result.group(2)
  29   except Exception, e:
  30     if gcc_error:
  31       sys.stderr.write(gcc_error)
  32     print >> sys.stderr, "compiler_version.py failed to execute:", compiler
  33     print >> sys.stderr, e
  34     return ""
  35
  36 def main():
  37   # Check if CXX environment variable exists and
  38   # if it does use that compiler.
  39   cxx = os.getenv("CXX", None)
  40   if cxx:
  41     cxxversion = GetVersion(cxx)
  42     if cxxversion != "":
  43       print cxxversion
  44       return 0
  45   else:
  46     # Otherwise we check the g++ version.
  47     gccversion = GetVersion("g++")
  48     if gccversion != "":
  49       print gccversion
  50       return 0
  51
  52   return 1
  53
  54 if __name__ == "__main__":
  55   sys.exit(main())