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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99708] __SIZEOF_FLOAT128__ not defined on
 powerpc64le-linux
Date: Fri, 04 Mar 2022 19:30:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99708

--- 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 otherwis=
e?
> Yes, the logic and control flow are byzantine.

No, far from it.
E.g. on linux -mlong-double-128 -mabi=3Dieeelongdouble -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 th=
at
one can do
#pragma GCC target ("no-float128")
or
#pragma GCC target ("float128")
in the middle of the source.=