Add -Wno-array-bounds to SConstruct for PNaCl GlibC build.

SConstruct

 #! -*- python -*-
 # Copyright (c) 2011 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import atexit
 import glob
 import os
 import platform
 import shutil
@@ skipping 517 matching lines @@
 pre_base_env['ENV']['CYGWIN'] = os.environ.get('CYGWIN', 'nodosfilewarning')
 
 if pre_base_env.Bit('werror'):
   werror_flags = ['-Werror']
 else:
   werror_flags = []
 
 # Allow variadic macros
 werror_flags = werror_flags + ['-Wno-variadic-macros']
 
+# Clang Bug:
+# array-bounds detection gives false positive on valid code in GLibC.
+# BUG= http://llvm.org/bugs/show_bug.cgi?id=11536
+if pre_base_env.Bit('bitcode') and pre_base_env.Bit('nacl_glibc'):
+  werror_flags += ['-Wno-array-bounds']
+
 # ----------------------------------------------------------
 # Method to make sure -pedantic, etc, are not stripped from the
 # default env, since occasionally an engineer will be tempted down the
 # dark -- but wide and well-trodden -- path of expediency and stray
 # from the path of correctness.
 
 def EnsureRequiredBuildWarnings(env):
   if env.Bit('linux') or env.Bit('mac'):
     required_env_flags = set(['-pedantic', '-Wall'] + werror_flags)
     ccflags = set(env.get('CCFLAGS'))
@@ skipping 3223 matching lines @@
   nacl_env.ValidateSdk()
 
 if BROKEN_TEST_COUNT > 0:
   msg = "There are %d broken tests." % BROKEN_TEST_COUNT
   if GetOption('brief_comstr'):
     msg += " Add --verbose to the command line for more information."
   print msg
 
 # separate warnings from actual build output
 Banner('B U I L D - O U T P U T:')