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      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())
     56