https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100246
--- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> --- for the record the patch in comment #3 allowed bootstrap to succeed on Darwin12 with clang 3.4-based Xcode.
iains at gcc dot gnu.org via Gcc-bugs Fri, 07 May 2021 12:44:26 -0700
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100246
--- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> --- for the record the patch in comment #3 allowed bootstrap to succeed on Darwin12 with clang 3.4-based Xcode.