Add gxx_version

build/compiler_version.py

-#!/usr/bin/python
-
-# Copyright (c) 2009 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""Compiler version checking tool for gcc
-
-Print gcc version as XY if you are running gcc X.Y.*.
-This is used to tweak build flags for gcc 4.4.
-"""
-
-import os
-import re
-import subprocess
-import sys
-
-def GetVersion(compiler):
-  try:
-    # Note that compiler could be something tricky like "distcc g++".
-    compiler = compiler + " -dumpversion"
-    pipe = subprocess.Popen(compiler, stdout=subprocess.PIPE, shell=True)
-    gcc_output = pipe.communicate()[0]
-    result = re.match(r"(\d+)\.(\d+)", gcc_output)
-    return result.group(1) + result.group(2)
-  except Exception, e:
-    print >> sys.stderr, "compiler_version.py failed to execute:", compiler
-    print >> sys.stderr, e
-    return ""
-
-def main():
-  # Check if CXX environment variable exists and
-  # if it does use that compiler.
-  cxx = os.getenv("CXX", None)
-  if cxx:
-    cxxversion = GetVersion(cxx)
-    if cxxversion != "":
-      print cxxversion
-      return 0
-  else:
-    # Otherwise we check the g++ version.
-    gccversion = GetVersion("g++")
-    if gccversion != "":
-      print gccversion
-      return 0
-
-  return 1
-
-if __name__ == "__main__":
-  sys.exit(main())