https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87071
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- (EE) Illegal instruction at address 0x7ffff2f2c8ea I don't see how this can possibly be a libstdc++ problem, since libstdc++ doesn't produce any CPU instructions, illegal or not. As I already said to you, there's nothing we can do with this info.