https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55252
--- Comment #17 from Jonathan Wakely <redi at gcc dot gnu.org> --- It would be less of a pain if -Wsystem-headers caused both locations to be printed, but it doesn't, so sometimes the only option is to dump the preprocessed source without line markers and then compile that to get two locations, then map the location in the preprocessed source back to a line in the original source.
