Add support for Mac OS X 64bit builds with GYP

build/common.gypi

 # Copyright 2012 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 301 matching lines @@
           ['OS=="freebsd" or OS=="openbsd"', {
             'cflags': [ '-I/usr/local/include' ],
           }],
           ['OS=="netbsd"', {
             'cflags': [ '-I/usr/pkg/include' ],
           }],
           ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd"', {
             'cflags': [ '-Wall', '<(werror)', '-W', '-Wno-unused-parameter',
                         '-Wnon-virtual-dtor', '-Woverloaded-virtual' ],
           }],
+          ['OS=="mac" and target_arch=="ia32"', {

[Jakob Kummerow, 2012/03/28 16:08:51]

Since these definitions (here and below) are independent from whether we build
in Release or Debug mode, how about moving them to a general OS=="mac" section
above? (To be precise, there's a big OS!="mac" section, which could get an
else-branch containing this.)

+            'xcode_settings': {
+              'ARCHS': ['i386']
+            }
+          }],
+          ['OS=="mac" and target_arch=="x64"', {
+            'xcode_settings': {
+              'ARCHS': ['x86_64']
+            }
+          }],
         ],
       },  # Debug
       'Release': {
         'conditions': [
           ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd" \
             or OS=="android"', {
             'cflags!': [
               '-O2',
               '-Os',
             ],
@@ skipping 21 matching lines @@
           ['OS=="mac"', {
             'xcode_settings': {
               'GCC_OPTIMIZATION_LEVEL': '3',  # -O3
 
               # -fstrict-aliasing.  Mainline gcc
               # enables this at -O2 and above,
               # but Apple gcc does not unless it
               # is specified explicitly.
               'GCC_STRICT_ALIASING': 'YES',
             },
+            'conditions': [
+              ['target_arch=="ia32"', {
+                'xcode_settings': {
+                  'ARCHS': ['i386']
+                }
+              }],
+              ['target_arch=="x64"', {
+                'xcode_settings': {
+                  'ARCHS': ['x86_64']
+                }
+              }],
+            ],
           }],  # OS=="mac"
           ['OS=="win"', {
             'msvs_configuration_attributes': {
               'OutputDirectory': '<(DEPTH)\\build\\$(ConfigurationName)',
               'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
               'CharacterSet': '1',
             },
             'msvs_settings': {
               'VCCLCompilerTool': {
                 'Optimization': '2',
@@ skipping 21 matching lines @@
                 # some test cases can cause stack overflow.
                 # 'StackReserveSize': '297152',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }