Gyp changes for ninja iOS build.

third_party/protobuf/protobuf.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'conditions': [
     ['use_system_protobuf==0', {
       'conditions': [
         ['OS!="win"', {
           'variables': {
@@ skipping 39 matching lines @@
               # the ninja build, so setting all the inputs and outputs isn't an
               # option). The first target is given here; the second target is the
               # normal protoc target under the condition that "OS==iOS".
               'target_name': 'compile_protoc',
               'type': 'none',
               'includes': ['../../build/ios/mac_build.gypi'],
               'actions': [
                 {
                   'action_name': 'compile protoc',
                   'inputs': [],
-                  'outputs': [],
+                  # A nonexistant name forces the ninja cmd every time.

[Mark Mentovai, 2013/05/01 18:12:10]

Here too.

+                  'outputs': [
+                    '<(ninja_product_dir)/protoc',

[Mark Mentovai, 2013/05/01 18:12:10]

So what…a real output and a fake output? Why?

+                    'compile_protoc'
+                  ],
                   'action': [
                     '<@(ninja_cmd)',
                     'protoc',
                   ],
                   'message': 'Generating the C++ protocol buffers compiler',
                 },
               ],
             },
           ],
         }],
@@ skipping 348 matching lines @@
           'toolsets': ['host', 'target'],
         },
         {
           'target_name': 'py_proto',
           'type': 'none',
         },
       ],
     }],
   ],
 }