https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87015
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Or if 7.3 works and 8.x doesn't and the two are ABI compatible (dunno about mingw), then you could after you find problematic *.ii file try to bisect which compiler revision changed the behavior and from there you we could try to discover what changed.
