https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59401
--- Comment #7 from Kazumoto Kojima <kkojima at gcc dot gnu.org> --- (In reply to Oleg Endo from comment #6) > Kaz, what's your opinion on making GBR to be call preserved by default? Looks OK to me for 5.0. It's clearly an ABI change but a change to the more robust direction and wouldn't be surprising to users.