As of g++-4.5, the first argument to EXPECT_EQ cannot be

base/logging_unittest.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace logging {
@@ skipping 43 matching lines @@
   const int kExpectedDebugOrReleaseCalls = 6;
   const int kExpectedDebugCalls = 6;
   const int kExpectedCalls =
       kExpectedDebugOrReleaseCalls + (DEBUG_MODE ? kExpectedDebugCalls : 0);
   EXPECT_CALL(mock_log_source, Log()).Times(kExpectedCalls).
       WillRepeatedly(Return("log message"));
 
   SetMinLogLevel(LOG_INFO);
 
   EXPECT_TRUE(LOG_IS_ON(INFO));
-  EXPECT_EQ(DEBUG_MODE != 0, DLOG_IS_ON(INFO));
+  // As of g++-4.5, the first argument to EXPECT_EQ cannot be a
+  // constant expression.
+  const bool kIsDebugMode = (DEBUG_MODE != 0);
+  EXPECT_EQ(kIsDebugMode, DLOG_IS_ON(INFO));
   EXPECT_TRUE(VLOG_IS_ON(0));
 
   LOG(INFO) << mock_log_source.Log();
   LOG_IF(INFO, true) << mock_log_source.Log();
   PLOG(INFO) << mock_log_source.Log();
   PLOG_IF(INFO, true) << mock_log_source.Log();
   VLOG(0) << mock_log_source.Log();
   VLOG_IF(0, true) << mock_log_source.Log();
 
   DLOG(INFO) << mock_log_source.Log();
@@ skipping 162 matching lines @@
   // These should still reference |some_variable| so we don't get
   // unused variable warnings.
   DCHECK(some_variable) << "test";
   DPCHECK(some_variable) << "test";
   DCHECK_EQ(some_variable, 1) << "test";
 }
 
 }  // namespace
 
 }  // namespace logging