http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56231
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> 2013-02-07 13:54:20 UTC --- To clarify, we are also switching between different translation-units main filenames - but I don't think we can easily distinguish this from #includes. Well, maybe we can, if at compile-time we can identify the "main" source via libcpp.
