id summary reporter owner description type status milestone component version severity resolution keywords cc 1275 boost::program_options::validation_error::what() is private anonymous Vladimir Prus The what() method of boost::program_options::validation_error is private, making it impossible to properly display the error message to the user (we have to catch or upcast to boost::program_options::error, whose what() doesn't provide the same level of detail (i.e. the option name)). Bugs closed To Be Determined program_options Boost 1.34.1 Problem fixed