score: Move _Watchdog_Ticks_since_boot definition

cpukit/score/Makefile.am

@@ -326,6 +326,7 @@ libscore_a_SOURCES += src/coretod.c src/coretodset.c src/coretodget.c \
 libscore_a_SOURCES += src/watchdog.c src/watchdogadjust.c \
     src/watchdogadjusttochain.c src/watchdoginsert.c src/watchdogremove.c \
     src/watchdogtickle.c
+libscore_a_SOURCES += src/watchdogtickssinceboot.c
 
 ## USEREXT_C_FILES
 libscore_a_SOURCES += src/userextaddset.c \

cpukit/score/include/rtems/score/watchdog.h

@@ -129,7 +129,7 @@ typedef struct {
  *
  * With a 1ms watchdog tick, this counter overflows after 50 days since boot.
  */
-SCORE_EXTERN volatile Watchdog_Interval _Watchdog_Ticks_since_boot;
+extern volatile Watchdog_Interval _Watchdog_Ticks_since_boot;
 
 /**@}*/
 

cpukit/score/src/watchdogtickssinceboot.c

@@ -0,0 +1,29 @@
+/**
+ *  @file
+ *
+ *  @brief Watchdog Ticks Since Boot
+ *  @ingroup ScoreWatchdog
+ */
+
+/*
+ *  COPYRIGHT (c) 1989-2009.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/score/watchdog.h>
+
+/*
+ * This is defined in a separate module to allow the new network to define it
+ * with an additional strong reference.  Strong references cannot alias a
+ * common symbol.  Since the GCC option -fno-common is not used throughout
+ * RTEMS we cannot define it here.
+ */
+volatile Watchdog_Interval _Watchdog_Ticks_since_boot;