Fixing compiler_version for Fedora.

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.
 """
 
 import os
 import re
 import subprocess
 import sys
 
 
 def GetVersion(compiler, tool):
   tool_output = tool_error = None
   try:
     # Note that compiler could be something tricky like "distcc g++".
     if tool == "compiler":
       compiler = compiler + " -dumpversion"
       # 4.6
       version_re = re.compile(r"(\d+)\.(\d+)")
     elif tool == "assembler":
       compiler = compiler + " -Xassembler --version -x assembler -c /dev/null"
-      # GNU assembler (GNU Binutils for Ubuntu) 2.22
-      version_re = re.compile(r"GNU [^ ]+ \(.*\) (\d+).(\d+)")
+      # Unmodified: GNU assembler (GNU Binutils) 2.24
+      # Ubuntu: GNU assembler (GNU Binutils for Ubuntu) 2.22
+      # Fedora: GNU assembler version 2.23.2
+      version_re = re.compile(r"^GNU [^ ]+ .* (\d+).(\d+).*?$", re.M)
     elif tool == "linker":
       compiler = compiler + " -Xlinker --version"
-      # GNU gold (GNU Binutils for Ubuntu 2.22) 1.11
-      version_re = re.compile(r"GNU [^ ]+ \(.*\) (\d+).(\d+)")
+      # Using BFD linker
+      # Unmodified: GNU ld (GNU Binutils) 2.24
+      # Ubuntu: GNU ld (GNU Binutils for Ubuntu) 2.22
+      # Fedora: GNU ld version 2.23.2
+      # Using Gold linker
+      # Unmodified: GNU gold (GNU Binutils 2.24) 1.11
+      # Ubuntu: GNU gold (GNU Binutils for Ubuntu 2.22) 1.11
+      # Fedora: GNU gold (version 2.23.2) 1.11
+      version_re = re.compile(r"^GNU [^ ]+ .* (\d+).(\d+).*?$", re.M)
     else:
       raise Exception("Unknown tool %s" % tool)
 
     pipe = subprocess.Popen(compiler, shell=True,
                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     tool_output, tool_error = pipe.communicate()
     if pipe.returncode:
       raise subprocess.CalledProcessError(pipe.returncode, compiler)
 
     result = version_re.match(tool_output)
@@ skipping 26 matching lines @@
     gccversion = GetVersion("g++", tool)
     if gccversion != "":
       print gccversion
       return 0
 
   return 1
 
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv[1:]))