[boost] [logging] lots of warnings

From: Phil Endecott (spam_from_boost_dev_at_[hidden])
Date: 2008-02-08 09:06:59

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.