https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118408
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #7) > Some of them, no? Only if one rebuilds all the new ABI std::regex using > objects with newer gcc. Ah yes, good point. > On the other side, was std::regex a thing in libstdc++ when we used to have > just the old ABI (i.e. an era where building with the old ABI was the norm, > rather than trying to do something really weird)? std::regex didn't work at all until GCC 4.9.0, but the cxx11 ABI was added in 5.1, so the 4.9.x releases had a working std::regex but only supported the old ABI.
