From b9a3b070d3bb7731e2aad8a448e6e7f3938dcdf3 Mon Sep 17 00:00:00 2001
From: Joerg Sonnenberger <joerg@bec.de>
Date: Sat, 29 Apr 2017 18:54:29 +0200
Subject: [PATCH] Don't check unaligned access in ubsan for GCC.

---
 libarchive/xxhash.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/libarchive/xxhash.c b/libarchive/xxhash.c
index 6f5ba52fa..70750bae0 100644
--- a/libarchive/xxhash.c
+++ b/libarchive/xxhash.c
@@ -141,13 +141,19 @@ typedef struct _U32_S { U32 v; } _PACKED U32_S;
 #  pragma pack(pop)
 #endif
 
-#define A32(x) (((const U32_S *)(x))->v)
-
 
 /****************************************
 ** Compiler-specific Functions and Macros
 *****************************************/
-#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+#define GCC_VERSION ((__GNUC__-0) * 100 + (__GNUC_MINOR__ - 0))
+
+#if GCC_VERSION >= 409
+__attribute__((__no_sanitize_undefined__))
+#endif
+static inline U32 A32(const void * x)
+{
+    return (((const U32_S *)(x))->v);
+}
 
 /* Note : although _rotl exists for minGW (GCC under windows), performance seems poor */
 #if defined(_MSC_VER)
-- 
2.47.3