access violation when using string literals with lambda style formatting expressions

[Stefan Mianome <smianome@…>]

The code below crashes with an access violation when using the BOOST_LOG_SEV macro. I'm using boost 1.60 compiled with msvc-10.0.

    #include <boost/log/trivial.hpp>
    #include <boost/log/sinks.hpp>
    #include <boost/log/expressions.hpp>
    #include <boost/log/expressions/formatters.hpp>
    #include <boost/log/attributes.hpp>
    #include <boost/core/null_deleter.hpp>
    #include <iostream>
    
    #define BOOST_TEST_MODULE TestsLogging
    #include <boost/test/unit_test.hpp>
        BOOST_AUTO_TEST_SUITE(example_lib_log)

        BOOST_AUTO_TEST_CASE(severity_logging_min) {
                                                
                namespace src = ::boost::log::sources;
                namespace keywords = ::boost::log::keywords;
                namespace expr = boost::log::expressions;
                namespace attributes = boost::log::attributes;

                //sink backend setup
                typedef boost::log::sinks::text_ostream_backend text_ostream_backend;

                boost::shared_ptr<text_ostream_backend> backend =
                        boost::make_shared<text_ostream_backend>();

                backend->add_stream(boost::shared_ptr<std::ostream>(&std::cerr, boost::null_deleter()));
                backend->auto_flush(true);

                //sink frontend setup
                typedef boost::log::sinks::synchronous_sink<text_ostream_backend> synchronous_sink_text_ostream_backend;
                        
                boost::shared_ptr<synchronous_sink_text_ostream_backend> sink(new synchronous_sink_text_ostream_backend(backend));

                sink->set_formatter(expr::stream << "[" << expr::message); //problem is here

                boost::log::core::get()->add_sink(sink);

                //logger setup
                typedef src::severity_logger<boost::log::trivial::severity_level> severity_logger;

                severity_logger lg;

                //logging function
                BOOST_LOG_SEV(lg, boost::log::trivial::debug) << "First entry."; //exception happens here

                boost::log::core::get()->remove_sink(sink);
        }
    BOOST_AUTO_TEST_SUITE_END()

• When I remove the line where the formatter for the sink is set, the code works fine.
• When I remove the string literal "[" from the stream (expr::stream << expr::message), the code works fine.
• When i move the string literal to the end (expr::stream << expr::message << "[") the code also works.
• The code works with boost 1.57.

[Andrey Semashev]

Works without a problem for me on gcc 5.2. Looks like a specific compiler issue to me.

[Stefan Mianome <smianome@…>]

i've just tried to run it on msvc-14. It works aswell. I've found a workaround for msvc-10 that suits my needs. By passing a custom formatting function to the sinks set_formatter function, conditional formatting + string literals at the beginning of the stream are possible. I've spent 2 days to figure out that the problem is not with the code :(

[Stefan Mianome <smianome@…>]

i've just tried to run it on msvc-14. It works aswell. I've found a workaround for msvc-10 that suits my needs. By passing a custom formatting function to the sinks set_formatter function, conditional formatting + string literals at the beginning of the stream are possible. I've spent 2 days to figure out that the problem is not with the code :(

[anonymous]

This got also reported on Boost.User for MSVC11: ​http://thread.gmane.org/gmane.comp.lib.boost.user/85258

[anonymous]

This seems to be the same bug as #12025.