I get lots of warnings when I compile code using the logging library with g++ 4.1.3 with -W -Wall. I think they're all "class with virtual functions has non-virtual destructor", e.g. /usr/local/src/boost-logging/boost/logging/detail/logger_base.hpp: In instantiation of ‘boost::logging::detail::default_cache_keeper<boost::logging::detail::cache_before_init<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >’: /usr/local/src/boost-logging/boost/logging/detail/logger_base.hpp:126: instantiated from ‘boost::logging::logger_base<boost::logging::gather::ostream_like::return_str<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> > >, boost::logging::default_, boost::logging::override>’ /usr/local/src/boost-logging/boost/logging/detail/logger.hpp:214: instantiated from ‘boost::logging::logger<boost::logging::gather::ostream_like::return_str<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> > >, boost::logging::default_>’ Session.cc:203: instantiated from here /usr/local/src/boost-logging/boost/logging/detail/logger_base.hpp:53: warning: ‘struct boost::logging::detail::default_cache_keeper<boost::logging::detail::cache_before_init<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >’ has virtual functions but non-virtual destructor /usr/local/src/boost-logging/boost/logging/detail/logger_base.hpp: In instantiation of ‘boost::logging::logger_base<boost::logging::gather::ostream_like::return_str<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> > >, boost::logging::default_, boost::logging::override>’: /usr/local/src/boost-logging/boost/logging/detail/logger.hpp:214: instantiated from ‘boost::logging::logger<boost::logging::gather::ostream_like::return_str<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> > >, boost::logging::default_>’ Session.cc:203: instantiated from here /usr/local/src/boost-logging/boost/logging/detail/logger_base.hpp:126: warning: ‘struct boost::logging::logger_base<boost::logging::gather::ostream_like::return_str<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> > >, boost::logging::default_, boost::logging::override>’ has virtual functions but non-virtual destructor These are too verbose to ignore, even if they are harmless. Can they be fixed? Phil.