Remving global statics from the headers, so we can split-link.

base/logging.h

 // Copyright (c) 2012 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.
 
 #ifndef BASE_LOGGING_H_
 #define BASE_LOGGING_H_
 
 #include <cassert>
 #include <string>
 #include <cstring>
@@ skipping 630 matching lines @@
 #define DVLOG(verboselevel) DVLOG_IF(verboselevel, VLOG_IS_ON(verboselevel))
 
 #define DVPLOG(verboselevel) DVPLOG_IF(verboselevel, VLOG_IS_ON(verboselevel))
 
 // Definitions for DCHECK et al.
 
 #if ENABLE_DCHECK
 
 #if defined(NDEBUG)
 
-BASE_EXPORT extern DcheckState g_dcheck_state;
+BASE_EXPORT DcheckState get_dcheck_state();
+BASE_EXPORT void set_dcheck_state(DcheckState state);
 
 #if defined(DCHECK_ALWAYS_ON)
 
 #define DCHECK_IS_ON() true
 #define COMPACT_GOOGLE_LOG_EX_DCHECK(ClassName, ...) \
   COMPACT_GOOGLE_LOG_EX_FATAL(ClassName , ##__VA_ARGS__)
 #define COMPACT_GOOGLE_LOG_DCHECK COMPACT_GOOGLE_LOG_FATAL
 const LogSeverity LOG_DCHECK = LOG_FATAL;
 
 #else
 
 #define COMPACT_GOOGLE_LOG_EX_DCHECK(ClassName, ...) \
   COMPACT_GOOGLE_LOG_EX_ERROR_REPORT(ClassName , ##__VA_ARGS__)
 #define COMPACT_GOOGLE_LOG_DCHECK COMPACT_GOOGLE_LOG_ERROR_REPORT
 const LogSeverity LOG_DCHECK = LOG_ERROR_REPORT;
 #define DCHECK_IS_ON()                                                  \
-  ((::logging::g_dcheck_state ==                                        \
+  ((::logging::get_dcheck_state() ==                                        \
     ::logging::ENABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS) &&        \
    LOG_IS_ON(DCHECK))
 
 #endif  // defined(DCHECK_ALWAYS_ON)
 
 #else  // defined(NDEBUG)
 
 // On a regular debug build, we want to have DCHECKs enabled.
 #define COMPACT_GOOGLE_LOG_EX_DCHECK(ClassName, ...) \
   COMPACT_GOOGLE_LOG_EX_FATAL(ClassName , ##__VA_ARGS__)
@@ skipping 303 matching lines @@
 #elif NOTIMPLEMENTED_POLICY == 5
 #define NOTIMPLEMENTED() do {\
   static bool logged_once = false;\
   LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\
   logged_once = true;\
 } while(0);\
 EAT_STREAM_PARAMETERS
 #endif
 
 #endif  // BASE_LOGGING_H_