https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97989
--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> --- cpp is just a different name of the same driver that defaults to -E, nothing else. -Wp,-g3 doesn't really do anything, because -g* aren't preprocessor options, it is a driver option (where driver among other transforms some -g* options to -dD for the preprocessor) and a compiler option.
