Remove warning when __builtin_frame_address is used with gcc >= 6.

lib/bcheck.c

@@ -234,6 +234,15 @@ BOUND_PTR_INDIR(8)
 BOUND_PTR_INDIR(12)
 BOUND_PTR_INDIR(16)
 
+#if defined(__GNUC__) && (__GNUC__ >= 6)
+/*
+ * At least gcc 6.2 complains when __builtin_frame_address is used whith
+ * nonzero argument.
+ */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wframe-address"
+#endif
+
 /* return the frame pointer of the caller */
 #define GET_CALLER_FP(fp)\
 {\
@@ -274,6 +283,10 @@ void FASTCALL __bound_local_delete(void *p1)
     }
 }
 
+#if defined(__GNUC__) && (__GNUC__ >= 6)
+#pragma GCC diagnostic pop
+#endif
+
 static BoundEntry *__bound_new_page(void)
 {
     BoundEntry *page;