[Bug libstdc++/95561] std::is_signed_v<__int128> is false

[janezz55 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95561

--- Comment #2 from Janez Zemva <janezz55 at gmail dot com> ---
(In reply to Marc Glisse from comment #1)
> Are you using -std=gnu++17 or -std=c++17 ?

yes, of course.