https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92826
--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- TS 18661-3 has been accepted in principle for C2x, but no-one has done the editing work needed to get it into the (LaTeX) form needed to add as an Annex to the C standard. Once that's in, I'll update GCC so that uses of _Float128 and the "f128" constant suffix will no longer be rejected with -std=c2x (or -std=gnu2x) -Wpedantic (but the "q" suffix will continue to be diagnosed).
