https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119694
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I meant it the other way around, keep the getenv calls that should work for all users, maintainers or not in the 15 release as is. Rename all other getenv calls (those which are meant for maintainer debugging). So GCC 15 wouldn't allow those out of the box unless one e.g. tweaks one line in the sources, and GCC 16 would then reenable them until the env vars are renamed, partily removed, partly turned into options, dumping into dump files etc.