Run most of the unordered container tests (not the exception tests) on warning

level 4 on Visual C++.


[SVN r38648]

test/container/Jamfile.v2

@@ -9,6 +9,7 @@ project unordered-test/container
     : requirements
         <toolset>intel-linux:"<cxxflags>-strict_ansi -cxxlib-icc"
         <toolset>gcc:<cxxflags>-Wsign-promo
+        <toolset>msvc:<cxxflags>/W4
     ;
 
 test-suite container-tests

test/container/compile_tests.hpp

@@ -3,7 +3,17 @@
 // 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)
 
+#if defined(BOOST_MSVC)
+#pragma warning(push)
+#pragma warning(disable:4100) // unreferenced formal parameter
+#endif
+
 #include <boost/concept_check.hpp>
+
+#if defined(BOOST_MSVC)
+#pragma warning(pop)
+#endif
+
 #include <boost/mpl/assert.hpp>
 #include <boost/mpl/bool.hpp>
 #include <boost/type_traits/is_same.hpp>