https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37820
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> --- (In reply to brian from comment #1) > To list predefined macros, use -dM with an empty input file, e.g. "gcc > -dM -E - </dev/null". Also, this is difficult to remember, and it would be nice to have a more memorable alias for it.
