https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95561
Bug ID: 95561 Summary: std::is_signed_v<__int128> is false Product: gcc Version: 10.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: janezz55 at gmail dot com Target Milestone: --- As the comment says, std::is_signed_v<__int128> should evaluate to true.