https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90223
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- I already said GCC 6.x is not supported in PR 88673
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90223
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- I already said GCC 6.x is not supported in PR 88673