https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106832
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I think the IEEE quad support isn't 100%, I see a couple of spots with: static if (real.mant_dig > 64) { pragma(msg, "printFloat tests disabled because of unsupported `real` format"); } where real.mant_dig == 64 is the Intel extended format (and 53 is double precision). IEEE quad is 113 though.