Part of fix for http://dartbug.com/6528

runtime/dart-runtime.gyp

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'includes': [
     'tools/gyp/runtime-configurations.gypi',
     'vm/vm.gypi',
     'bin/bin.gypi',
     'third_party/double-conversion/src/double-conversion.gypi',
@@ skipping 42 matching lines @@
       'dependencies': [
         'libdart_dependency_helper',
       ],
       'actions': [
         {
           'action_name': 'generate_version_cc',
           'inputs': [
             'tools/make_version.py',
             '../tools/VERSION',
             '<(version_in_cc_file)',
-            # We need to list the libdart_dependency_helper executable here
-            # otherwise the action doesn't get executed if any of
-            # libdart/libdart_withcore changes
+            # Depend on libdart_dependency_helper to track the libraries it
+            # depends on.
             '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)libdart_dependency_helper<(EXECUTABLE_SUFFIX)',
           ],
           'outputs': [
             '<(version_cc_file)',
           ],
           'action': [
             'python',
             '-u', # Make standard I/O unbuffered.
             'tools/make_version.py',
             '--output', '<(version_cc_file)',
@@ skipping 21 matching lines @@
     },
     {
       'target_name': 'runtime_packages',
       'type': 'none',
       'dependencies': [
         '../pkg/pkg.gyp:pkg_packages',
       ],
     },
   ],
 }