Suppress opus #pragma warning on iOS & OS/X, too.

third_party/opus/opus.gyp

 # 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.
 
 {
   'variables': {
     'conditions': [
       ['(OS=="android" or chromeos==1) and target_arch=="arm"', {
         'use_opus_fixed_point%': 1,
         'use_opus_arm_optimization%': 1,
@@ skipping 33 matching lines @@
           'defines': [
             'USE_ALLOCA',
             'inline=__inline',
           ],
           'msvs_disabled_warnings': [
             4305,  # Disable truncation warning in celt/pitch.c .
             4334,  # Disable 32-bit shift warning in src/opus_encoder.c .
           ],
         }],
         [ 'os_posix==1 and OS!="android"', {
+          # Suppress a warning given by opus_decoder.c that tells us
+          # optimizations are turned off.
           'cflags': [
-            # Suppress a warning given by opus_decoder.c that tells us
-            # optimizations are turned off.
             '-Wno-#pragma-messages',
           ],
+          'xcode_settings': {
+            'WARNING_CFLAGS': [
+              '-Wno-#pragma-messages',
+            ],
+          },
         }],
         ['use_opus_fixed_point==0', {
           'include_dirs': [
             'src/silk/float',
           ],
           'sources/': [
             ['exclude', '/fixed/[^/]*_FIX.(h|c)$'],
           ],
         }, {
           'defines': [
@@ skipping 47 matching lines @@
       'sources': [
         'src/src/opus_demo.c',
       ],
       'include_dirs': [
         'src/celt',
         'src/silk',
       ],
     },  # target opus_demo
   ]
 }