From 249492e08adbf034976770ab3b021ba093a2ab18 Mon Sep 17 00:00:00 2001
From: jvoisin
Date: Sat, 18 Mar 2023 14:01:02 +0100
Subject: Make use of __builtin_dynamic_object_size

GCC and Clang provide __builtin_dynamic_object_size
(see documentation: https://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html),
so we should make use of it when its available.
---
 include/fortify-headers.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'include/fortify-headers.h')

diff --git a/include/fortify-headers.h b/include/fortify-headers.h
index 4de5bef..a37cd4a 100644
--- a/include/fortify-headers.h
+++ b/include/fortify-headers.h
@@ -21,4 +21,12 @@
 #define _FORTIFY_FN(fn) _FORTIFY_ORIG(__USER_LABEL_PREFIX__,fn); \
 	extern __inline__ __attribute__((__always_inline__,__gnu_inline__,__artificial__))
 
+
+/* Use __builtin_dynamic_object_size with _FORTIFY_SOURCE>2, if available.  */
+#if _FORTIFY_SOURCE  > 2 && defined __has_builtin && __has_builtin (__builtin_dynamic_object_size)
+#define __bos(ptr, type) __builtin_dynamic_object_size (ptr, type)
+#else
+#define __bos(ptr, type) __builtin_object_size (ptr, type)
+#endif
+
 #endif
-- 
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