1 files changed, 5 insertions, 1 deletions
diff --git a/vm_core.h b/vm_core.h
index 8ebd390532..39843093f3 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -109,7 +109,11 @@
 #define UNLIKELY(x) (x)
 #endif /* __GNUC__ >= 3 */
 
-#if (defined(__clang__) && __clang_major__ >= 4)
+#ifndef __has_attribute
+# define __has_attribute(x) 0
+#endif
+
+#if __has_attribute(unused)
 #define UNINITIALIZED_VAR(x) x __attribute__((unused))
 #elif defined(__GNUC__) && __GNUC__ >= 3
 #define UNINITIALIZED_VAR(x) x = x