, std::allocator<char> >]' /cygdrive/c/data/boost/develop/boost/boost/lexical_cast.hpp:256: instantiated from `Target boost::lexical_cast(const Source&) [with Target = int, Source = std ::basic_string<char, std::char_traits<char>, std::allocator<char> >]' /cygdrive/c/data/boost/develop/boost/boost/program_options/detail/value_semantic .hpp:83: instantiated from `void boost::program_options::validate(boost::any&, const std::vector<std::basic_string<charT, std::char_traits<_CharT>, std::alloc ator<_T2> >, std::allocator<std::basic_string<charT, std::char_traits<_CharT>, s
We seem to have acquired even more intrusive warnings from lexical_cast now, for example a quickbook build yields: /cygdrive/c/data/boost/develop/boost/boost/lexical_cast.hpp: In constructor `boo st::detail::lexical_stream<Target, Source>::lexical_stream() [with Target = int, Source = std::basic_string<char, std::char_traits<char>, std::allocator<char> > ]': /cygdrive/c/data/boost/develop/boost/boost/lexical_cast.hpp:230: instantiated from `Target boost::detail::lexical_cast(typename boost::call_traits<T2>::value_ type) [with Target = int, Source = std::basic_string<char, std::char_traits<char td::allocator<_T2> > > >&, T*, long int) [with T = int, charT = char]' /cygdrive/c/data/boost/develop/boost/boost/program_options/detail/value_semantic .hpp:151: instantiated from `void boost::program_options::typed_value<T, charT
::xparse(boost::any&, const std::vector<std::basic_string<charT, std::char_trai ts<_CharT>, std::allocator<_T2> >, std::allocator<std::basic_string<charT, std:: char_traits<_CharT>, std::allocator<_T2> > > >&) const [with T = int, charT = ch ar]' /cygdrive/c/data/boost/develop/boost/tools/quickbook/detail/quickbook.cpp:521: instantiated from here /cygdrive/c/data/boost/develop/boost/boost/lexical_cast.hpp:150: warning: statem ent has no effect
which is pretty unpleasant :-( At least previously the warning only struct at level 4 in MSVC, now they seem to hit everything unfortunately. Of course there may not be a solution that suites everyone! John.