Compile rtc_base_objc for Mac.

webrtc/base/base.gyp

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'includes': [ '../build/common.gypi', ],
   'conditions': [
     ['os_posix == 1 and OS != "mac" and OS != "ios"', {
       'conditions': [
         ['sysroot!=""', {
           'variables': {
             'pkg-config': '../../../build/linux/pkg-config-wrapper "<(sysroot)" "<(target_arch)"',
           },
         }, {
           'variables': {
             'pkg-config': 'pkg-config'
           },
         }],
       ],
     }],
-    # TODO(tkchin): Mac support. There are a bunch of problems right now because
-    # of some settings pulled down from Chromium.
-    ['OS=="ios"', {
+    ['OS=="ios" or (OS=="mac" and mac_deployment_target=="10.7")', {
       'targets': [
         {
           'target_name': 'rtc_base_objc',
           'type': 'static_library',
+          'includes': [ '../build/objc_common.gypi' ],
           'dependencies': [
             'rtc_base',
           ],
           'sources': [
             'objc/NSString+StdString.h',
             'objc/NSString+StdString.mm',
             'objc/RTCDispatcher.h',
             'objc/RTCDispatcher.m',
             'objc/RTCLogging.h',
             'objc/RTCLogging.mm',
@@ skipping 11 matching lines @@
               ],
               'all_dependent_settings': {
                 'xcode_settings': {
                   'OTHER_LDFLAGS': [
                     '-framework AVFoundation',
                   ],
                 },
               },
             }],
           ],
-          'xcode_settings': {
-            'CLANG_ENABLE_OBJC_ARC': 'YES',
-            'CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS': 'YES',
-          },
         }
       ],
     }], # OS=="ios"
   ],
   'targets': [
     {
       # The subset of rtc_base approved for use outside of libjingle.
       'target_name': 'rtc_base_approved',
       'type': 'static_library',
       'sources': [
@@ skipping 668 matching lines @@
     },
     {
      'target_name': 'gtest_prod',
       'type': 'static_library',
       'sources': [
         'gtest_prod_util.h',
       ],
     },
   ],
 }