https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106151
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Barry Revzin from comment #2) > I guess that's like: > > C++11/14: neither is an aggregate (base class). > C++17: both are aggregates. > C++20: Bar is an aggregate, but Foo is not (user-declared constructor). > > But that really shouldn't affect the code-gen here? (right???) It changes because if the constructor is used or it is zero-initialized . And it just happens GCC is not able to optimize it back to what the zero-initialized can be done.
