https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91423
--- Comment #3 from Anders Schau Knatten <anders at knatten dot org> --- (In reply to Richard Biener from comment #1) > I think GCC tells you that deriving from std::array from a packed struct is > going to cause trouble because std::array expects to be naturally aligned? Do you know why std::array expect to be naturally aligned? I checked by the way, and gcc and clang both seem to naturally align base class subobjects. So in this case, the std::array subobject will be naturally aligned regardless of Vec packing: https://godbolt.org/z/9ZZ3eT In any case, if that is what it's trying to tell me, I think the warning could be improved.
