build/compiler_version.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2011 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, stdout=subprocess.PIPE, shell=True)
  22     gcc_output = pipe.communicate()[0]
  23     result = re.match(r"(\d+)\.(\d+)", gcc_output)
  24     return result.group(1) + result.group(2)
  25   except Exception, e:
  26     print >> sys.stderr, "compiler_version.py failed to execute:", compiler
  27     print >> sys.stderr, e
  28     return ""
  29
  30 def main():
  31   # Check if CXX environment variable exists and
  32   # if it does use that compiler.
  33   cxx = os.getenv("CXX", None)
  34   if cxx:
  35     cxxversion = GetVersion(cxx)
  36     if cxxversion != "":
  37       print cxxversion
  38       return 0
  39   else:
  40     # Otherwise we check the g++ version.
  41     gccversion = GetVersion("g++")
  42     if gccversion != "":
  43       print gccversion
  44       return 0
  45
  46   return 1
  47
  48 if __name__ == "__main__":
  49   sys.exit(main())