Merge from trunk:

* Fix stream related issues with libc++ and clang (fixes #7704, fixes #8267)
* Change runtime assert to compile time when converting to pointer (fixes #8267)

[SVN r83689]

test/lexical_cast_to_pointer_test.cpp

@@ -0,0 +1,21 @@
+//  //  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2013.
+//
+//  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).
+
+#include <boost/lexical_cast.hpp>
+#include <boost/type.hpp>
+
+#define BOOST_INCLUDE_MAIN
+#include <boost/test/test_tools.hpp>
+
+int test_main(int, char*[])
+{
+    boost::lexical_cast<char*>("Hello");
+    return 0;
+}