https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61579
--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> --- One consequence of it not being a warning option is that -Werror=write-strings is accepted but behaves identically to -Wwrite-strings, which is pretty surprising. You need to use -Wwrite-strings -Werror=discarded-qualifiers to really enforce string literals as const types (which would make a lot more sense if it was -fwrite-strings).
