https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69517
Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jason at gcc dot gnu.org --- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> --- In 4.9.3 we implemented the proposal for arrays of runtime bound that was pulled out of C++14, and so it was pulled out of the compiler as well. So now excess initializers are undefined behavior. I don't think this is a bug.