https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110836
--- Comment #2 from Andris Pavenis <andris at gcc dot gnu.org> --- Warning would allow to detected problem earlier. Otherwise it could only be detected later in case when affected structure or class is part of an library and its objects are not created directly inside the library. In this case the inability to create objects may only be detected later when building other packages which uses this library In our case the problem appeared when replacing deriving from boost::noncopyable with added deleted copy constructor and deleted assignment operators.
