http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47486
--- Comment #7 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-02-15 15:51:45 UTC --- (In reply to comment #5) > "%{E|M|MM|MT|MQ|MD|MMD:;:" F951_OPTIONS "}" Good idea - and looks cleaner. Except (my bug) that -MD and -MMD do not imply "-E". Thus, those shouldn't appear in that list. Additionally, with -M the output goes - according to Kai (thanks for testing!) - still to stdout. I think the "if (gfc_cpp_preprocess_only ())" in fortran/cpp.c's gfc_cpp_init_0 needs to be modified.