Enable -fstrict-aliasing in the GYP build of V8 for the Mac in Release mode

tools/gyp/v8.gyp

 # Copyright 2009 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 79 matching lines @@
             'conditions': [
               [ 'gcc_version=="44"', {
                 'cflags': [
                   # Avoid gcc 4.4 strict aliasing issues in dtoa.c
                   '-fno-strict-aliasing',
                   # Avoid crashes with gcc 4.4 in the v8 test suite.
                   '-fno-tree-vrp',
                 ],
               }],
             ],
-            'cflags_cc': [
-              '-fno-rtti',
-            ],
           }],
-          ['OS=="mac"', {
-            'xcode_settings': {
-              'GCC_OPTIMIZATION_LEVEL': '3',
-            },
-          }],
+          ['OS=="mac"', {
+            'xcode_settings': {
+              'GCC_OPTIMIZATION_LEVEL': '3',  # -O3
+              'GCC_STRICT_ALIASING': 'YES',   # -fstrict-aliasing.  Mainline gcc
+                                              # enables this at -O2 and above,
+                                              # but Apple gcc does not unless it
+                                              # is specified explicitly.
+            },
+          }],
           ['OS=="win"', {
             'msvs_configuration_attributes': {
               'OutputDirectory': '$(SolutionDir)$(ConfigurationName)',
               'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
               'CharacterSet': '1',
             },
             'msvs_settings': {
               'VCCLCompilerTool': {
                 'RuntimeLibrary': '0',
                 'Optimizations': '2',
                 'InlineFunctionExpansion': '2',
                 'EnableIntrinsicFunctions': 'true',
                 'FavorSizeOrSpeed': '0',
                 'OmitFramePointers': 'true',
                 'StringPooling': 'true',
               },
               'VCLinkerTool': {
                 'LinkIncremental': '1',
                 'OptimizeReferences': '2',
                 'OptimizeForWindows98': '1',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],
         ],
       },
     },
-    'xcode_settings': {
-      'GCC_ENABLE_CPP_EXCEPTIONS': 'NO',
-      'GCC_ENABLE_CPP_RTTI': 'NO',
-    },
   },
   'targets': [
     {
       'target_name': 'v8',
       'type': 'none',
       'conditions': [
         ['v8_use_snapshot=="true"', {
           'dependencies': ['v8_snapshot'],
         },
         {
@@ skipping 235 matching lines @@
       'conditions': [
         ['target_arch=="arm"', {
           'include_dirs+': [
             '../../src/arm',
           ],
           'sources': [
             '../../src/arm/assembler-arm-inl.h',
             '../../src/arm/assembler-arm.cc',
             '../../src/arm/assembler-arm.h',
             '../../src/arm/builtins-arm.cc',
-            '../../src/arm/cfg-arm.cc',
+            '../../src/arm/cfg-arm.cc',
             '../../src/arm/codegen-arm.cc',
             '../../src/arm/codegen-arm.h',
             '../../src/arm/constants-arm.h',
             '../../src/arm/cpu-arm.cc',
             '../../src/arm/debug-arm.cc',
             '../../src/arm/disasm-arm.cc',
             '../../src/arm/frames-arm.cc',
             '../../src/arm/frames-arm.h',
             '../../src/arm/ic-arm.cc',
             '../../src/arm/jump-target-arm.cc',
@@ skipping 10 matching lines @@
         }],
         ['target_arch=="ia32"', {
           'include_dirs+': [
             '../../src/ia32',
           ],
           'sources': [
             '../../src/ia32/assembler-ia32-inl.h',
             '../../src/ia32/assembler-ia32.cc',
             '../../src/ia32/assembler-ia32.h',
             '../../src/ia32/builtins-ia32.cc',
-            '../../src/ia32/cfg-ia32.cc',
+            '../../src/ia32/cfg-ia32.cc',
             '../../src/ia32/codegen-ia32.cc',
             '../../src/ia32/codegen-ia32.h',
             '../../src/ia32/cpu-ia32.cc',
             '../../src/ia32/debug-ia32.cc',
             '../../src/ia32/disasm-ia32.cc',
             '../../src/ia32/frames-ia32.cc',
             '../../src/ia32/frames-ia32.h',
             '../../src/ia32/ic-ia32.cc',
             '../../src/ia32/jump-target-ia32.cc',
             '../../src/ia32/macro-assembler-ia32.cc',
@@ skipping 12 matching lines @@
         }],
         ['target_arch=="x64"', {
           'include_dirs+': [
             '../../src/x64',
           ],
           'sources': [
             '../../src/x64/assembler-x64-inl.h',
             '../../src/x64/assembler-x64.cc',
             '../../src/x64/assembler-x64.h',
             '../../src/x64/builtins-x64.cc',
-            '../../src/x64/cfg-x64.cc',
+            '../../src/x64/cfg-x64.cc',
             '../../src/x64/codegen-x64.cc',
             '../../src/x64/codegen-x64.h',
             '../../src/x64/cpu-x64.cc',
             '../../src/x64/debug-x64.cc',
             '../../src/x64/disasm-x64.cc',
             '../../src/x64/frames-x64.cc',
             '../../src/x64/frames-x64.h',
             '../../src/x64/ic-x64.cc',
             '../../src/x64/jump-target-x64.cc',
             '../../src/x64/macro-assembler-x64.cc',
@@ skipping 110 matching lines @@
       ],
       'conditions': [
         [ 'OS=="win"', {
           # This could be gotten by not setting chromium_code, if that's OK.
           'defines': ['_CRT_SECURE_NO_WARNINGS'],
         }],
       ],
     },
   ],
 }