https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71534
bogdan <inadgob at yahoo dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |inadgob at yahoo dot com --- Comment #3 from bogdan <inadgob at yahoo dot com> --- Following the adoption of P0386R2 into the working draft, the declaration of bar is now a definition, because bar is an inline variable. This makes GCC's behaviour standard-conforming in C++1z mode as far as I can tell. However, I think a fix should still be applied to C++14 and 11 modes, in the interest of portability.