https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99708
--- Comment #26 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #25)
> It is defined to __ieee128 whenever that exists, and not defined otherwise?
> Yes, the logic and control flow are byzantine.
No, far from it.
E.g. on linux -mlong-double-128 -mabi=ieeelongdouble -mno-float128
means that __ieee128 works, long double works too and are the same, but
__float128 doesn't.
Even worse (and the reason why I've moved it to a different function) is that
one can do
#pragma GCC target ("no-float128")
or
#pragma GCC target ("float128")
in the middle of the source.
