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From: "g.peterhoff@t-online.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/109758] std::abs(__float128) doesn't support NaN
Date: Sat, 06 May 2023 22:48:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109758

--- Comment #3 from g.peterhoff@t-online.de ---
>> libstdc++ doesn't depend on libquadmath and the __float128 support is th=
ere very limited.
Yes, exactly. There should be nothing of quadmath in the std implementation=
s of
C/C++. But in bits/std_abs.h this is the case.

>> Use std::float128_t instead (in GCC 13.1)?
std::float128_t can only be used from C++23 on, but quadmath can also be us=
ed
with older standard/compiler versions.=