https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91440
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|c |pch Known to work| |9.1.0 Host| |x86_64-w64-mingw32 Known to fail| |9.2.0 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- I don't think there's any changes that would explain this. Can I ask you to try bisecting the compiler or taking out that extra patch?