build/compiler_version.py

   1 #!/usr/bin/python
   2
   3 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
   4 # Use of this source code is governed by a BSD-style license that can be
   5 # found in the LICENSE file.
   6
   7 """Compiler version checking tool for gcc
   8
   9 Print gcc version as XY if you are running gcc X.Y.*.
  10 This is used to tweak build flags for gcc 4.4.
  11 """
  12
  13 import os
  14 import re
  15 import subprocess
  16 import sys
  17
  18 def GetVersion(compiler):
  19   try:
  20     # Note that compiler could be something tricky like "distcc g++".
  21     compiler = compiler + " -dumpversion"
  22     pipe = subprocess.Popen(compiler, stdout=subprocess.PIPE, shell=True)
  23     gcc_output = pipe.communicate()[0]
  24     result = re.match(r"(\d+)\.(\d+)", gcc_output)
  25     return result.group(1) + result.group(2)
  26   except Exception, e:
  27     print >> sys.stderr, "compiler_version.py failed to execute:", compiler
  28     print >> sys.stderr, e
  29     return ""
  30
  31 def main():
  32   # Check if CXX environment variable exists and
  33   # if it does use that compiler.
  34   cxx = os.getenv("CXX", None)
  35   if cxx:
  36     cxxversion = GetVersion(cxx)
  37     if cxxversion != "":
  38       print cxxversion
  39       return 0
  40   else:
  41     # Otherwise we check the g++ version.
  42     gccversion = GetVersion("g++")
  43     if gccversion != "":
  44       print gccversion
  45       return 0
  46
  47   return 1
  48
  49 if __name__ == "__main__":
  50   sys.exit(main())