Add handling for | to the transitional alternative layout rule

[ghc-hetmet.git] / includes / rts / storage / MBlock.h

diff --git a/includes/rts/storage/MBlock.h b/includes/rts/storage/MBlock.h
index 03396c1..0943d4c 100644 (file)
--- a/includes/rts/storage/MBlock.h
+++ b/includes/rts/storage/MBlock.h
@@ -24,6 +24,11 @@ extern void *getFirstMBlock(void);
 extern void *getNextMBlock(void *mblock);
 #endif
 
+#ifdef THREADED_RTS
+// needed for HEAP_ALLOCED below
+extern SpinLock gc_alloc_block_sync;
+#endif
+
 /* -----------------------------------------------------------------------------
    The HEAP_ALLOCED() test.