all in the gyp

gyp/common_conditions.gypi

 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
 #    'SK_SUPPORT_HINTING_SCALE_FACTOR',
   ],
   'conditions' : [
     [ 'skia_gpu == 1',
       {
@@ skipping 290 matching lines @@
           [ 'skia_warnings_as_errors', {
             'xcode_settings': {
               'OTHER_CPLUSPLUSFLAGS': [
                 '-Werror',
                 '-Wall',
                 '-Wextra',
                 '-Wno-unused-parameter',
               ],
             },
           }],
+# This old compiler is really bad at figuring out when things are uninitialized, so ignore it.
+          [ '<(mac_sdk)==10.6', {
+            'xcode_settings': {
+              'OTHER_CPLUSPLUSFLAGS': [
+                '-Wno-uninitialized',
+              ],
+            },
+          }],
         ],
         'configurations': {
           'Debug': {
             'xcode_settings': {
               'GCC_OPTIMIZATION_LEVEL': '0',
             },
           },
           'Release': {
             'xcode_settings': {
               'GCC_OPTIMIZATION_LEVEL': '<(skia_release_optimization_level)',
@@ skipping 142 matching lines @@
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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 # indent-tabs-mode:nil
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