Enable the -Wundef warning for clang

webrtc/modules/audio_processing/test/process_test.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include <math.h>
 #include <stdio.h>
 #include <string.h>
 #ifdef WEBRTC_ANDROID
 #include <sys/stat.h>
 #endif
 
 #include <algorithm>
 #include <memory>
 
 #include "webrtc/base/format_macros.h"
+#include "webrtc/base/ignore_wundef.h"
 #include "webrtc/base/timeutils.h"
 #include "webrtc/modules/audio_processing/include/audio_processing.h"
 #include "webrtc/modules/audio_processing/include/config.h"
 #include "webrtc/modules/audio_processing/test/protobuf_utils.h"
 #include "webrtc/modules/audio_processing/test/test_utils.h"
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/system_wrappers/include/cpu_features_wrapper.h"
+#include "webrtc/test/gtest.h"
 #include "webrtc/test/testsupport/fileutils.h"
 #include "webrtc/test/testsupport/perf_test.h"
+
+RTC_PUSH_IGNORING_WUNDEF()
 #ifdef WEBRTC_ANDROID_PLATFORM_BUILD
-#include "gtest/gtest.h"
 #include "external/webrtc/webrtc/modules/audio_processing/debug.pb.h"
 #else
-#include "testing/gtest/include/gtest/gtest.h"
 #include "webrtc/modules/audio_processing/debug.pb.h"
 #endif
+RTC_POP_IGNORING_WUNDEF()
 
 namespace webrtc {
 
 using webrtc::audioproc::Event;
 using webrtc::audioproc::Init;
 using webrtc::audioproc::ReverseStream;
 using webrtc::audioproc::Stream;
 
 namespace {
 
@@ skipping 1108 matching lines @@
 }  // namespace
 }  // namespace webrtc
 
 int main(int argc, char* argv[]) {
   webrtc::void_main(argc, argv);
 
   // Optional, but removes memory leak noise from Valgrind.
   google::protobuf::ShutdownProtobufLibrary();
   return 0;
 }