Reland of mac and ios: Build third-party code with -Wall.

third_party/class-dump/class-dump.gyp

 # Copyright (c) 2015 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': {
     'mac_deployment_target': '10.9',
     'mac_sdk_min': '10.9',
   },
   'targets': [
@@ skipping 150 matching lines @@
         'src/Source/NSError-CDExtensions.h',
         'src/Source/NSError-CDExtensions.m',
         'src/Source/NSScanner-CDExtensions.h',
         'src/Source/NSScanner-CDExtensions.m',
         'src/Source/NSString-CDExtensions.h',
         'src/Source/NSString-CDExtensions.m',
         'src/Source/ULEB128.h',
         'src/Source/ULEB128.m',
         'src/Source/cd_objc2.h',
       ],
+      'variables': {
+        'clang_warning_flags': [
+          # e.g. CDRebaseTypeDescription in CDLCDyldInfo.m
+          '-Wno-unused-function',
+        ],
+      },
       'link_settings': {
         'libraries': [
           '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
         ],
         'xcode_settings': {
           'OTHER_LDFLAGS': [
             '-lcrypto',
           ],
         },
       },
       'include_dirs': [
         'src/Source',
       ],
       'xcode_settings': {
         'GCC_PREFIX_HEADER': 'src/class-dump-Prefix.pch',
         'CLANG_ENABLE_OBJC_ARC': 'YES',
         'CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS': 'NO',
       },
     },
   ],  # targets
 }