https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116330
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Created attachment 60278 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60278&action=edit As far as I can get it Note changes in white spaces even spaces to returns will cause the compare debug to go away. This is why this one is so fragile. I have not looked into what is going wrong either.