Switch usage of _DEBUG macro to NDEBUG.

webrtc/system_wrappers/include/logging.h

 /*
  *  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.
  */
 
@@ skipping 113 matching lines @@
   LOG_SEVERITY_PRECONDITION(webrtc::sev) \
     webrtc::LogMessage(__FILE__, __LINE__, webrtc::sev).stream()
 
 // The _V version is for when a variable is passed in.  It doesn't do the
 // namespace concatination.
 #define LOG_V(sev) \
   LOG_SEVERITY_PRECONDITION(sev) \
     webrtc::LogMessage(__FILE__, __LINE__, sev).stream()
 
 // The _F version prefixes the message with the current function name.
-#if (defined(__GNUC__) && defined(_DEBUG)) || defined(WANT_PRETTY_LOG_F)
+#if (defined(__GNUC__) && !defined(NDEBUG)) || defined(WANT_PRETTY_LOG_F)
 #define LOG_F(sev) LOG(sev) << __PRETTY_FUNCTION__ << ": "
 #else
 #define LOG_F(sev) LOG(sev) << __FUNCTION__ << ": "
 #endif
 
 #define LOG_API0() LOG_F(LS_VERBOSE)
 #define LOG_API1(v1) LOG_API0() << #v1 << "=" << v1
 #define LOG_API2(v1, v2) LOG_API1(v1) \
     << ", " << #v2 << "=" << v2
 #define LOG_API3(v1, v2, v3) LOG_API2(v1, v2) \
     << ", " << #v3 << "=" << v3
 
 #define LOG_FERR0(sev, func) LOG(sev) << #func << " failed"
 #define LOG_FERR1(sev, func, v1) LOG_FERR0(sev, func) \
     << ": " << #v1 << "=" << v1
 #define LOG_FERR2(sev, func, v1, v2) LOG_FERR1(sev, func, v1) \
     << ", " << #v2 << "=" << v2
 #define LOG_FERR3(sev, func, v1, v2, v3) LOG_FERR2(sev, func, v1, v2) \
     << ", " << #v3 << "=" << v3
 #define LOG_FERR4(sev, func, v1, v2, v3, v4) LOG_FERR3(sev, func, v1, v2, v3) \
     << ", " << #v4 << "=" << v4
 
 #endif  // LOG
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_LOGGING_H_