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//Title of this code
//g++  4.9.1

#include <boost/log/sinks/sync_frontend.hpp>
#include <boost/log/sinks/basic_sink_backend.hpp>
#include <boost/log/sinks/frontend_requirements.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/trivial.hpp>
#include <iostream>

class ForwardingLogSinkBackend : public boost::log::sinks::basic_sink_backend<boost::log::sinks::combine_requirements<boost::log::sinks::synchronized_feeding>::type> {
public:
    explicit ForwardingLogSinkBackend()
    {
    }

// The function consumes the log records that come from the the logging frontend
    void consume(const boost::log::record_view& rec)
    {
        auto map = rec.attribute_values();
        for(auto mi = map.begin(); mi != map.end(); ++mi) {
            std::clog << mi->first << " : " << mi->second.get_type().pretty_name() << std::endl;
        }

auto severity = rec.attribute_values()[boost::log::aux::default_attribute_names::severity()].extract<boost::log::trivial::severity_level>();
        std::clog << "severity" << " = " << severity << ", message = " << *rec[boost::log::expressions::smessage] << std::endl;
    }

};

typedef boost::log::sinks::synchronous_sink<ForwardingLogSinkBackend> ForwardingLogSink;

int main()
{
    auto sink = boost::make_shared<ForwardingLogSink>(boost::make_shared<ForwardingLogSinkBackend>());
    boost::log::core::get()->add_sink(sink);

BOOST_LOG_TRIVIAL(info) << "Hello, World!";
}

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Compilation time: 4.63 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 4.78 sec