https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111956
--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> --- Note that the default C long double is what is controlled by --with-long-double-128 and --with-long-double-format, those configs do not tell you whether using __ieee128 with -mabi=ieeelongdouble will work.
