https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101544
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> --- IIRC libstdc++ had a freestanding mode that could serve as base.
rguenth at gcc dot gnu.org via Gcc-bugs Wed, 21 Jul 2021 06:27:14 -0700
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101544
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> --- IIRC libstdc++ had a freestanding mode that could serve as base.