I don't think there was anything specific about C++11 that would have forced every implementation to change their ABI. IIRC, one of the most significant was a

I don't think there was anything specific about C++11 that would have forced every implementation to change their ABI. IIRC, one of the most significant was a change that made copy-on-write an invalid (or at least much more difficult) implementation for std::string, and gcc's std::string was CoW. http://developerblog.redhat.com/2015/02/05/gcc5-and-the-c11-abi/ http://developerblog.redhat.com/2015/02/05/gcc5-and-the-c11-...