https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58822
--- Comment #27 from Michi Henning <michi at triodia dot com> --- My apologies for my incredibly late reply. (I just stumbled across this issue again.) And my thanks to you for taking the time to analyse this! I think your analysis is right. 3.8.5/3: "- the pointer is implicitly converted to a pointer to a virtual base class" So, this is UB. Really nasty, in the sense that make_shared<T>(args) doesn't always do the same thing as shared_ptr<T>(new T(args)) Seeing how subtle this is, a warning for the implicit conversion to pointer to base would be supremely useful.
