From 9ab67dce75977b92a8c872d51bdbe1f8b6816859 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Thu, 28 Aug 2014 17:00:03 -0600
Subject: [PATCH] In some configurations, g_system_tmer must be extern'ed as a
 private variable

---
 sched/clock/clock.h | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/sched/clock/clock.h b/sched/clock/clock.h
index 976ec117fb..f875d3e842 100644
--- a/sched/clock/clock.h
+++ b/sched/clock/clock.h
@@ -66,14 +66,25 @@
 /********************************************************************************
  * Global Variables
  ********************************************************************************/
+#if !defined(CONFIG_SCHED_TICKLESS) && __HAVE_KERNEL_GLOBALS == 0
+  /* The system clock exists (CONFIG_SCHED_TICKLESS), but it not prototyped
+   * globally in include/nuttx/clock.h.
+   */
 
-#ifdef CONFIG_SYSTEM_TIME64
-extern uint64_t        g_tickbias;
-#else
-extern uint32_t        g_tickbias;
+#  ifdef CONFIG_SYSTEM_TIME64
+extern volatile uint64_t g_system_timer;
+#  else
+extern volatile uint32_t g_system_timer;
+#  endif
 #endif
 
-extern struct timespec g_basetime;
+#ifdef CONFIG_SYSTEM_TIME64
+extern uint64_t          g_tickbias;
+#else
+extern uint32_t          g_tickbias;
+#endif
+
+extern struct timespec   g_basetime;
 
 /********************************************************************************
  * Public Function Prototypes