FIX #2688

[ghc-hetmet.git] / rts / sm / GC.h

diff --git a/rts/sm/GC.h b/rts/sm/GC.h
index 913df24..5e2e3a5 100644 (file)
--- a/rts/sm/GC.h
+++ b/rts/sm/GC.h
@@ -39,7 +39,7 @@ extern SpinLock gc_alloc_block_sync;
 #endif
 
 #if defined(PROF_SPIN) && defined(THREADED_RTS)
-StgWord64 whitehole_spin;
+extern StgWord64 whitehole_spin;
 #endif
 
 #define WORK_UNIT_WORDS 128