Reland of -fno-exceptions only on .cc files https://codereview.chromium.org/560873003/ with fix for…

third_party/libc++/libc++.gyp

 # Copyright 2013 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.
 
 {
   'targets': [
     {
       'target_name': 'libcxx_proxy',
       'type': 'none',
       'dependencies=': [
@@ skipping 73 matching lines @@
       'include_dirs': [
         'trunk/include',
         '../libc++abi/trunk/include',
       ],
       'cflags': [
         '-fstrict-aliasing',
         '-nostdinc++',
         '-std=c++11',
       ],
       'cflags_cc!': [
+        '-fno-exceptions',
         '-fno-rtti',
       ],
       'cflags!': [
-        '-fno-exceptions',
         '-fvisibility=hidden',
       ],
       'ldflags': [
         '-nodefaultlibs',
       ],
       'ldflags!': [
         # This somehow causes a warning from clang about an unused compilation
         # option. Use '-lpthread' instead.
         # TODO(earthdok): find out what's causing the warning.
         '-pthread',
       ],
       'libraries': [
         '-lc',
         '-lgcc_s',
         '-lpthread',
         '-lrt',
       ],
     },
   ]
 }