https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112968
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- The above listed failures are all FAILs in libstdc++, except for a couple of compilation timed out ones (caused by valgrind being too slow and the box being busy). So yes, it is just -std=c++26.
