Disable harmless warnings for 3rdparty code: yasm.

third_party/yasm/yasm.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.
 
 # The yasm build process creates a slew of small C subprograms that
 # dynamically generate files at various point in the build process.  This makes
 # the build integration moderately complex.
 #
 # There are three classes of dynamically generated files:
 #   1) C source files that should be included in the build (eg., lc3bid.c)
@@ skipping 140 matching lines @@
          '<(shared_generated_dir)/x86cpu.c',
          '<(shared_generated_dir)/x86regtmod.c',
       ],
       'include_dirs': [
         '<@(yasm_include_dirs)',
         '<(shared_generated_dir)',
         '<(generated_dir)',
       ],
       'defines': [ '<@(yasm_defines)' ],
       'cflags': [ '<@(yasm_cflags)', ],
+      'conditions': [
+        ['clang==1', {
+          'xcode_settings': {
+            'WARNING_CFLAGS': [
+              # yasm passes a `const elf_machine_sym*` through `void*`.
+              '-Wno-incompatible-pointer-types',
+            ],
+          },
+          'cflags': [
+            '-Wno-incompatible-pointer-types',
+          ],
+        }],
+      ],
       'rules': [
         {
           'rule_name': 'generate_gperf',
           'extension': 'gperf',
           'inputs': [ '<(PRODUCT_DIR)/'
                       '<(EXECUTABLE_PREFIX)genperf<(EXECUTABLE_SUFFIX)' ],
           'outputs': [
             '<(generated_dir)/<(RULE_INPUT_ROOT).c',
           ],
           'action': ['<(PRODUCT_DIR)/genperf',
@@ skipping 349 matching lines @@
          'source/patched-yasm/tools/re2c/mbo_getopt.c',
          'source/patched-yasm/tools/re2c/substr.c',
          'source/patched-yasm/tools/re2c/translate.c',
       ],
       'include_dirs': [
         '<@(yasm_include_dirs)',
       ],
       'cflags': [
         '-std=gnu99',
       ],
+      'conditions': [
+        ['clang==1', {
+          'xcode_settings': {
+            'WARNING_CFLAGS': [
+              # re2c is missing CLOSEVOP from one switch.
+              '-Wno-switch-enum',
+            ],
+          },
+          'cflags': [
+            '-Wno-switch-enum',
+          ],
+        }],
+      ],
     },
     {
       'target_name': 'genmodule',
       'type': 'executable',
       'toolsets': ['host'],
       'dependencies': [
         'config_sources',
       ],
       'sources': [
         'source/patched-yasm/libyasm/genmodule.c',
       ],
       'include_dirs': [
         '<@(yasm_include_dirs)',
 
       ],
       'cflags': [
         '-std=gnu99',
       ],
     },
   ],
 }