https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77728
--- Comment #39 from Jakub Jelinek <jakub at gcc dot gnu.org> --- It is an ABI change, so I think it is highly undesirable to backport. It is enough that people will have to rebuild many packages built by GCC 7 prereleases, if it is backported, they would have to rebuild also anything built by GCC 5 or 6.
