On Fri, 19 Apr 2024, Qing Zhao wrote:
> +The size of the union is as if the flexiable array member were omitted
> +except that it may have more trailing padding than the omission would imply.
"trailing padding" is more a concept for structures than for unions (where
padding depends on which union member is active). But I suppose it's
still true that the union can be larger than without the flexible member,
because of alignment considerations.
union u { char c; int a[]; };
needs to be sufficiently aligned for int, which means the size is a
multiple of the size of int, whereas if the flexible array member weren't
present, the size could be 1 byte.
--
Joseph S. Myers
josmy...@redhat.com
