Add throw_from_library_test

test/lib3_throw.hpp

@@ -0,0 +1,35 @@
+#ifndef LIB3_THROW_HPP_INCLUDED
+#define LIB3_THROW_HPP_INCLUDED
+
+// Copyright 2018 Peter Dimov
+//
+// 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/config.hpp>
+#include <exception>
+
+#if defined(LIB3_DYN_LINK)
+# if defined(LIB3_SOURCE)
+#  define LIB3_DECL BOOST_SYMBOL_EXPORT
+# else
+#  define LIB3_DECL BOOST_SYMBOL_IMPORT
+# endif
+#else
+# define LIB3_DECL
+#endif
+
+namespace lib3
+{
+
+struct exception: public std::exception
+{
+};
+
+LIB3_DECL void f();
+
+} // namespace lib3
+
+#endif // #ifndef LIB3_THROW_HPP_INCLUDED