[Bug tree-optimization/81849] missing -Wstringop-overflow writing to the last element of a struct

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81849

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is expected and I thought was documented a few times over as an GNU
extension.