https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85672
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #5) > (In reply to Marc Glisse from comment #4) > > - -Wsystem-headers -Wundef will warn > > That's the status quo. It would take a ton of effort to avoid -Wundef > warnings in libstdc++ and that's not something I'm going to work on. In other words, don't use -Wsystem-headers -Wundef
