From 9b511b4e0f05b253324f9ffb672652936cfcd6bd Mon Sep 17 00:00:00 2001
From: Wei-keng Liao <wkliao@users.noreply.github.com>
Date: Thu, 16 Nov 2017 00:01:01 -0600
Subject: [PATCH] fix codes might break strict-aliasing rules

---
 libsrc/ncx.m4 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/libsrc/ncx.m4 b/libsrc/ncx.m4
index f28aa9a43..96ad9210b 100644
--- a/libsrc/ncx.m4
+++ b/libsrc/ncx.m4
@@ -461,10 +461,15 @@ swap8b(void *dst, const void *src)
     op = (uint32_t*)((char*)dst+4);
     *op = SWAP4(*op);
 #else
+    uint64_t tmp = *(uint64_t*)src;
+    tmp = SWAP8(tmp);
+    memcpy(dst, &tmp, 8);
+
+    /* Codes below will cause "break strict-aliasing rules" in gcc
     uint64_t *op = (uint64_t*)dst;
-    /* copy over, make the below swap in-place */
     *op = *(uint64_t*)src;
     *op = SWAP8(*op);
+    */
 #endif
 
 #if 0