https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113970
--- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> --- Created attachment 57501 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57501&action=edit without PCH As Andrew says, the differences are in the debug info (it might even only be in the order of the debug info - hard to tell from a quick comparison).