Enable logging for Mac by default on debug builds.

webrtc/base/logging.cc

 /*
  *  Copyright 2004 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 329 matching lines @@
   for (StreamList::iterator it = streams_.begin(); it != streams_.end(); ++it) {
     min_sev = std::min(dbg_sev_, it->second);
   }
   min_sev_ = min_sev;
 }
 
 void LogMessage::OutputToDebug(const std::string& str,
                                LoggingSeverity severity,
                                const std::string& tag) {
   bool log_to_stderr = log_to_stderr_;
-#if defined(WEBRTC_MAC) && !defined(WEBRTC_IOS) && (!defined(DEBUG) || defined(NDEBUG))
+#if defined(WEBRTC_MAC) && !defined(WEBRTC_IOS) && (!defined(_DEBUG) || defined(NDEBUG))
   // On the Mac, all stderr output goes to the Console log and causes clutter.
   // So in opt builds, don't log to stderr unless the user specifically sets
   // a preference to do so.
   CFStringRef key = CFStringCreateWithCString(kCFAllocatorDefault,
                                               "logToStdErr",
                                               kCFStringEncodingUTF8);
   CFStringRef domain = CFBundleGetIdentifier(CFBundleGetMainBundle());
   if (key != NULL && domain != NULL) {
     Boolean exists_and_is_valid;
     Boolean should_log =
@@ skipping 193 matching lines @@
   }
 
   if (state) {
     state->unprintable_count_[input] = consecutive_unprintable;
   }
 }
 
 //////////////////////////////////////////////////////////////////////
 
 }  // namespace rtc