Fix compiler_version.py on systems with non-English locale.

build/compiler_version.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 """
@@ skipping 42 matching lines @@
     return result.group(1) + result.group(2)
   except Exception, e:
     if tool_error:
       sys.stderr.write(tool_error)
     print >> sys.stderr, "compiler_version.py failed to execute:", compiler
     print >> sys.stderr, e
     return ""
 
 
 def main(args):
+  # Force the locale to C otherwise the version string could be localized
+  # making regex matching fail.
+  os.environ["LC_ALL"] = "C"
+
   tool = "compiler"
   if len(args) == 1:
     tool = args[0]
   elif len(args) > 1:
     print "Unknown arguments!"
 
   # Check if CXX environment variable exists and
   # if it does use that compiler.
   cxx = os.getenv("CXX", None)
   if cxx:
     cxxversion = GetVersion(cxx, tool)
     if cxxversion != "":
       print cxxversion
       return 0
   else:
     # Otherwise we check the g++ version.
     gccversion = GetVersion("g++", tool)
     if gccversion != "":
       print gccversion
       return 0
 
   return 1
 
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv[1:]))