Bug 679832: In nsCheapSets, cast 32-bit value to intptr_t before converting it to 64-bit void*, to silence GCC 4.6 warning. r=bsmedberg

xpcom/ds/nsCheapSets.h

@@ -175,7 +175,16 @@ private:
   /** Set the single integer */
   void SetInt(PRInt32 aInt)
   {
-    mValOrHash = (void*)((aInt << 1) | 0x1);
+    /**
+     * NOTE: on 64-bit GCC, we do an intermediate cast to (intptr_t) to fix
+     * build warning about converting 32-bit value to 64-bit pointer.
+     * This is GCC-only since some platforms/compilers lack "intptr_t".
+     */
+    mValOrHash = (void*)
+#if (defined(__GNUC__) && defined(__x86_64__))
+                 (intptr_t)
+#endif
+                 ((aInt << 1) | 0x1);
   }
   /** Create the hash and initialize */
   nsresult InitHash(nsInt32HashSet** aSet);