Merge hash warning fixes from trunk.

[SVN r58032]

test/hash_no_ext_fail_test.cpp

@@ -3,17 +3,26 @@
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
-#define HASH_NAMESPACE boost
+#include "./config.hpp"
 
 // Simple test to make sure BOOST_HASH_NO_EXTENSIONS does disable extensions
 // (or at least one of them).
-#define BOOST_HASH_NO_EXTENSIONS
+#if !defined(BOOST_HASH_NO_EXTENSIONS)
+#  define BOOST_HASH_NO_EXTENSIONS
+#endif
 
-#include <boost/functional/hash.hpp>
-#include <boost/functional/hash.hpp>
+#ifdef TEST_STD_INCLUDES
+#  include <functional>
+#else
+#  include <boost/functional/hash.hpp>
+#endif
+
+template <class T> void ignore(T const&) {}
 
 int main()
 {
     HASH_NAMESPACE::hash< int[10] > hasher;
+    ignore(hasher);
+
     return 0;
 }