clang support

testing/gtest.gyp

 # Copyright (c) 2009 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.
 
 {
   'targets': [
     {
       'target_name': 'gtest',
       'type': '<(library)',
       'msvs_guid': 'BFE8E2A7-3B3B-43B0-A994-3058B852DB8B',
@@ skipping 61 matching lines @@
             # must be instructed that RTTI is disabled here, and for any
             # direct dependents that might include gtest headers.
             'GTEST_HAS_RTTI=0',
           ],
           'direct_dependent_settings': {
             'defines': [
               'GTEST_HAS_RTTI=0',
             ],
           },
         }],
+        ['clang==1', {
+          # We want gtest features that use tr1::tuple, but clang currently
+          # doesn't support the variadic templates used by libstdc++'s
+          # implementation.  gtest supports this scenario by providing its
+          # own implementation but we must opt in to it.
+          'defines': [
+            'GTEST_USE_OWN_TR1_TUPLE=1',
+          ],
+          'direct_dependent_settings': {
+            'defines': [
+              'GTEST_USE_OWN_TR1_TUPLE=1',
+            ],
+          },
+        }],
       ],
       'direct_dependent_settings': {
         'defines': [
           'UNIT_TEST',
         ],
         'include_dirs': [
           'gtest/include',  # So that gtest headers can find themselves.
         ],
         'target_conditions': [
           ['_type=="executable"', {'test': 1}],
@@ skipping 14 matching lines @@
       ],
     },
   ],
 }
 
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