https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119684
--- Comment #18 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I'm afraid implementing format specifier extensions months or years before they are actually used in the compiler is not possible, they are added when we need them for something. Usually that is during gcc development stage (so May-mid Nov), so if during patch review the submitter is reminded to post a patch against gettext, there could be a few months before it is actually needed (Feb-Apr). And, not every GCC major release actually adds new format specifiers.
