1 files changed, 8 insertions, 0 deletions
diff --git a/gc.h b/gc.h
index 1b112f8459..439f8d349c 100644
--- a/gc.h
+++ b/gc.h
@@ -74,4 +74,12 @@ int ruby_get_stack_grow_direction(volatile VALUE *addr);
 # define STACK_UPPER(x, a, b) (stack_growup_p(x) ? a : b)
 #endif
 
+#if STACK_GROW_DIRECTION
+#define STACK_GROW_DIR_DETECTION
+#define STACK_DIR_UPPER(a,b) STACK_UPPER(0, a, b)
+#else
+#define STACK_GROW_DIR_DETECTION VALUE stack_grow_dir_detection
+#define STACK_DIR_UPPER(a,b) STACK_UPPER(&stack_grow_dir_detection, a, b)
+#endif
+
 #endif /* RUBY_GC_H */