From 9ee33b67cabd51eb5f09d6460a0a37341c9a92fb Mon Sep 17 00:00:00 2001
From: "Peter D. Barnes, Jr." <barnes26@llnl.gov>
Date: Mon, 15 Jul 2013 14:19:57 -0700
Subject: [PATCH] Fix strict aliasing warning.

---
 src/core/model/hash-function.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/core/model/hash-function.h b/src/core/model/hash-function.h
index df0d9b661..1845d1709 100644
--- a/src/core/model/hash-function.h
+++ b/src/core/model/hash-function.h
@@ -21,6 +21,7 @@
 #ifndef HASHFUNCTION_H
 #define HASHFUNCTION_H
 
+#include <cstring>  // memcpy
 #include "simple-ref-count.h"
 
 namespace ns3 {
@@ -143,8 +144,11 @@ public:
   }
   uint32_t GetHash32 (const char * buffer, const size_t size)
   {
-    uint64_t hash = GetHash64 (buffer, size);
-    return *(uint32_t *)(void *)(&hash);
+    uint32_t hash32;
+    uint64_t hash64 = GetHash64 (buffer, size);
+
+    memcpy (&hash32, &hash64, sizeof (hash32));
+    return hash32;
   }
   void clear () { };
 private: