https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122667
--- Comment #6 from Marc Mutz <marc.mutz at hotmail dot com> --- They're part of the public API, documented to be deprecated (https://doc.qt.io/qt-6/qobject-obsolete.html), but they lack the compiler warning that usually goes with deprecations. You can't just "remove [API] and see what breaks", because the problem isn't Qt (we can git-grep instead, we don't need a deprecation macro), but our _users_.
