Update protobuf.gyp for iOS.

 protoc must be build for the Mac platform and not for iOS. mac_build.gypi is used to allow this.

TEST=None
BUG=None
R=stuartmorgan@chromium.org


Review URL: https://chromiumcodereview.appspot.com/10855048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150778 0039d316-1c4b-4281-b951-d872f2087c98

third_party/protobuf/protobuf.gyp

@@ -165,6 +165,8 @@
     },
     {
       'target_name': 'protoc',
+      'conditions': [
+        ['OS!="ios"', {
           'type': 'executable',
           'toolsets': ['host'],
           'sources': [
@@ -232,6 +234,44 @@
             '<(config_h_dir)',
             'src/src',
           ],
+        }, {  # else, OS=="ios"
+          'type': 'none',
+          'variables': {
+            'ninja_output_dir': 'ninja-protoc',
+            # Gyp to rerun
+            're_run_targets': [
+              'third_party/protobuf/protobuf.gyp',
+            ],
+          },
+          'includes': ['../../build/ios/mac_build.gypi'],
+          'actions': [
+            {
+              'action_name': 'compile protoc',
+              'inputs': [],
+              'outputs': [],
+              'action': [
+                '<@(ninja_cmd)',
+                'protoc',
+              ],
+              'message': 'Generating the C++ protocol buffers compiler',
+            },
+            {
+              'action_name': 'copy protoc',
+              'inputs': [
+                '<(ninja_product_dir)/protoc',
+              ],
+              'outputs': [
+                '<(PRODUCT_DIR)/protoc',
+              ],
+              'action': [
+                'cp',
+                '<(ninja_product_dir)/protoc',
+                '<(PRODUCT_DIR)/protoc',
+              ],
+            },
+          ],
+        }],
+      ],
     },
     {
       # Generate the python module needed by all protoc-generated Python code.