https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69840
--- Comment #3 from Kostya Serebryany <kcc at gcc dot gnu.org> --- You don't :) The agreement between the teams was that the code in gcc is a verbatim copy of upstream. (Well, there was a single-line difference at some point) If you break this assumption, the next merge will undo your change. Or the next merge will become impossible.
