Add support for Mac OS X 64bit builds with GYP

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 7647a7969d42a1e4094f8eb16e0701ba948ae992..eb8e641c436957dbfea09781e32d16fb11c8d5b7 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -319,6 +319,16 @@
             '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': {
@@ -360,6 +370,18 @@
               # 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': {