https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119481
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Alejandro Colomar from comment #6) > But maybe I should say (part of) this extension is quite dangerous, > regardless of it violating the standard. So don't use the option to enable the extensions then. > And it would allow using the extension in new code, in ways that are not > dangerous. It seems like what you want is a way to enable individual extensions from the plan9 set. Then the existing -fplan9-extensions option will still enable them all, as it's designed to do. But code that wants to use one or two of those extensions, not all, can select that instead.