https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85222
--- Comment #15 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Richard Biener from comment #13) > I'm probably going to locally patch it to be consistent with the default ABI > choice - that at least keeps programs working that do not explicitely choose > the ABI via #define _GLIBCXX_USE_CXX11_ABI and is consistent with the system > integrators choice of the default ABI to keep compatibility to older GCC > versions. That makes sense. Maybe we should do that on trunk too (it doesn't affect the default configuration where the new ABI is the default).