> I was mainly worried about us trying to for example copy a bit-packed
> substructure like
>
> struct A {
> unsigned use_1_bit : 1;
> struct B {
> char large[100];
> } b;
> } a, b;
>
> where b.large[0] is at offset 1 bit of a (I believe this is possible
> with Ada, right?).Actually no, it's not possible. Once something is BLKmode, it's at least aligned on a byte boundary. It's only possible for integral modes. -- Eric Botcazou
