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diff --git a/boost/log/utility/unused_variable.hpp b/boost/log/utility/unused_variable.hpp
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+/*
+ *          Copyright Andrey Semashev 2007 - 2014.
+ * 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)
+ */
+/*!
+ * \file   unused_variable.hpp
+ * \author Andrey Semashev
+ * \date   10.05.2008
+ *
+ * The header contains definition of a macro to suppress compiler warnings about unused variables.
+ */
+
+#ifndef BOOST_LOG_UTILITY_UNUSED_VARIABLE_HPP_INCLUDED_
+#define BOOST_LOG_UTILITY_UNUSED_VARIABLE_HPP_INCLUDED_
+
+#include <boost/log/detail/config.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+#if defined(__GNUC__)
+
+//! The macro suppresses compiler warnings for \c var being unused
+#define BOOST_LOG_UNUSED_VARIABLE(type, var, initializer) __attribute__((unused)) type var initializer
+
+#else
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+template< typename T >
+BOOST_FORCEINLINE void no_unused_warnings(T const&) BOOST_NOEXCEPT {}
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+//! The macro suppresses compiler warnings for \c var being unused
+#define BOOST_LOG_UNUSED_VARIABLE(type, var, initializer) type var initializer; ::boost::log::aux::no_unused_warnings(var)
+
+#endif
+
+#endif // BOOST_LOG_UTILITY_UNUSED_VARIABLE_HPP_INCLUDED_