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diff --git a/boost/log/support/spirit_qi.hpp b/boost/log/support/spirit_qi.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   support/spirit_qi.hpp
+ * \author Andrey Semashev
+ * \date   19.07.2009
+ *
+ * This header enables Boost.Spirit.Qi support for Boost.Log.
+ */
+
+#ifndef BOOST_LOG_SUPPORT_SPIRIT_QI_HPP_INCLUDED_
+#define BOOST_LOG_SUPPORT_SPIRIT_QI_HPP_INCLUDED_
+
+#include <boost/utility/enable_if.hpp>
+#include <boost/spirit/include/qi_parse.hpp>
+#include <boost/spirit/include/qi_domain.hpp>
+#include <boost/spirit/include/support_unused.hpp>
+#include <boost/spirit/home/support/meta_compiler.hpp> // spirit::compile()
+#include <boost/spirit/home/qi/nonterminal/nonterminal_fwd.hpp> // rule forward declaration
+#include <boost/log/detail/config.hpp>
+#include <boost/log/utility/functional/matches.hpp>
+#include <boost/log/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+//! This tag type is used if an expression is recognized as a Boost.Spirit.Qi expression
+struct boost_spirit_qi_expression_tag;
+
+//! The metafunction detects the matching expression kind and returns a tag that is used to specialize \c match_traits
+template< typename ExpressionT >
+struct matching_expression_kind< ExpressionT, typename boost::enable_if< spirit::traits::matches< spirit::qi::domain, ExpressionT > >::type >
+{
+    typedef boost_spirit_qi_expression_tag type;
+};
+
+//! The matching function implementation
+template< typename ExpressionT >
+struct match_traits< ExpressionT, boost_spirit_qi_expression_tag >
+{
+    typedef typename spirit::result_of::compile< spirit::qi::domain, ExpressionT, spirit::unused_type >::type compiled_type;
+
+    static compiled_type compile(ExpressionT const& expr)
+    {
+        return spirit::compile< spirit::qi::domain >(expr);
+    }
+
+    template< typename StringT >
+    static bool matches(StringT const& str, ExpressionT const& expr)
+    {
+        typedef typename StringT::const_iterator const_iterator;
+        const_iterator it = str.begin(), end = str.end();
+        return (spirit::qi::parse(it, end, expr) && it == end);
+    }
+};
+
+//! The matching function implementation
+template< typename IteratorT, typename T1, typename T2, typename T3, typename T4 >
+struct match_traits< spirit::qi::rule< IteratorT, T1, T2, T3, T4 >, boost_spirit_qi_expression_tag >
+{
+    typedef spirit::qi::rule< IteratorT, T1, T2, T3, T4 > compiled_type;
+    static compiled_type compile(compiled_type const& expr) { return expr; }
+
+    template< typename StringT >
+    static bool matches(StringT const& str, compiled_type const& expr)
+    {
+        typedef typename StringT::const_iterator const_iterator;
+        const_iterator it = str.begin(), end = str.end();
+        return (spirit::qi::parse(it, end, expr) && it == end);
+    }
+};
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // BOOST_LOG_SUPPORT_SPIRIT_QI_HPP_INCLUDED_