Manually pad them, and it'll complain about unused fields ;) I've actually had some pieces of code where it was super useful to enable that padding warning as

Manually pad them, and it'll complain about unused fields ;) I've actually had some pieces of code where it was super useful to enable that padding warning as an error. Some complicated C++ types that needed to have identical memory layouts across compilers yet often weren't because of some really nasty shenanigans... -Weverything is for people who really want to explicitly opt out of every warning they don't like.