I'm in the middle of converting a large project from C++03 to C++14, and of course crossing the C++11 gap, I want identify all of the places where the override keyword should be used but is not, and add it. When I turned on -Wsuggest-override in gcc-7.2 I got a fair number of warnings from boost code, for example: ...boost/program_options/value_semantic.hpp:304:14: error: ‘bool boost::program_options::typed_value::is_composing() const [with T = std::basic_string<char>; charT = char]’ can be marked override [-Werror=suggest-override] bool is_composing() const { return m_composing; } ^~~~~~~~~~~~ ...boost/program_options/value_semantic.hpp:306:18: error: ‘unsigned int boost::program_options::typed_value::min_tokens() const [with T = std::basic_string<char>; charT = char]’ can be marked override [-Werror=suggest-override] unsigned min_tokens() const ^~~~~~~~~~ ...boost/program_options/value_semantic.hpp:315:18: error: ‘unsigned int boost::program_options::typed_value::max_tokens() const [with T = std::basic_string<char>; charT = char]’ can be marked override [-Werror=suggest-override] unsigned max_tokens() const { ^~~~~~~~~~ ...boost/program_options/value_semantic.hpp:325:14: error: ‘bool boost::program_options::typed_value::is_required() const [with T = std::basic_string<char>; charT = char]’ can be marked override [-Werror=suggest-override] bool is_required() const { return m_required; } ^~~~~~~~~~~ (There were others - this is just a small sample) This is probably not the first time this has been brought up, but there is no BOOST_OVERRIDE (or BOOST_FINAL, for that matter) definition in Boost.Config that would allow Boost itself to be compatible with C++03 or C++11 cleanly relative to this language feature. I found a number of posts about this issue elsewhere. Has this issue been discussed here before? I could spend some time adding this to Boost.Config and then making boost compile cleanly with cxxstd=03,11 toolset=gcc-7 cxxflags="-Wsuggest-override", as it would help support a more complete conversion to the new language level for projects, and it would enable existing projects to turn on the warning to improve their code, as well as improve Boost. Thoughts? - Jim