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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/107815] 20_util/to_chars/float128_c++23.cc FAILs
Date: Thu, 24 Nov 2022 09:16:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107815

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #10)
> It's only necessary on sparc: i386-pc-solaris2.11 PASSed even before.
> That's what I've been using successfully last night:
>=20
> +// Solaris has non-conforming printf, see PR98384 and PR107815.
> +#if !(defined(__sun__) && defined(__svr4__) && defined(__sparc__))
>      std::numeric_limits<std::float128_t>::max()
> +#endif

I think i386-pc-solaris2.11 doesn't do anything for the test.
While __STDCPP_FLOAT128_T__ is defined there,
_GLIBCXX_LDOUBLE_IS_IEEE_BINARY128 shouldn't be (long double I bet is
Intel extended 80-bit format) and
_GLIBCXX_HAVE_FLOAT128_MATH is defined for now only on glibc 2.26 or later
(where the library provides sinf128 etc. APIs for _Float128).=