On Tue, May 12, 2020 at 11:39:17AM -0700, Conrad Meyer wrote: > Why not just use _Bool and leave the compatibility definition only for > C++ (#define _Bool bool)? There was such version in interim, see https://reviews.freebsd.org/D24297?vs=on&id=70906#toc Exp-run reported issues with this variant, please look at the bug trail yourself.