https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70238
Michael Matz <matz at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |matz at gcc dot gnu.org --- Comment #4 from Michael Matz <matz at gcc dot gnu.org> --- Well, I think one basic promise we try to make with our shared libs is that it _can_ be upgraded in a system and it's expected to work. I don't think experimental features should be allowed to deviate from that rule (for instance many of the other parts of c++11 cared for this by either not providing symbols in libstdc++.so at all or providing compatibility). Basically our shared library (not just the object files) has a change in one symbol, and we didn't bump either the symversion or the soname, which I'd say is a bug (we can't fix anymore :-/ ).