Don't treat warnings as errors when compiling with GCC 4.6

build/common.gypi

 # Copyright (c) 2011 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1067 matching lines @@
   },
   'conditions': [
     ['os_posix==1 and OS!="mac"', {
       'target_defaults': {
         # Enable -Werror by default, but put it in a variable so it can
         # be disabled in ~/.gyp/include.gypi on the valgrind builders.
         'variables': {
           # Use -fno-strict-aliasing, see http://crbug.com/32204
           'no_strict_aliasing%': 1,
           'conditions': [
-            ['OS=="linux"', {
+            # Disabled for GCC 4.6; see http://crbug.com/80071
+            ['OS=="linux" and gcc_version!=46', {
               'werror%': '-Werror',
               }, { # turn off -Werror on other Unices
               'werror%': '',
             }],
           ],
         },
         'cflags': [
           '<(werror)',  # See note above about the werror variable.
           '-pthread',
           '-fno-exceptions',
@@ skipping 660 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: