On Fri, May 30, 2025 at 11:06:01AM -0700, Kees Cook wrote:
> #define __DEFINE_FLEX(type, name, member, count, trailer...) \
> _Static_assert(__builtin_constant_p(count), \
> "onstack flex array members require compile-time const
> count"); \
> union {
> \
> u8 bytes[struct_size_t(type, member, count)]; \
> type obj; \
> } name##_u trailer; \
> type *name = (type *)&name##_u
>
> #define _DEFINE_FLEX(type, name, member, count, initializer...)
> \
> __DEFINE_FLEX(type, name, member, count, = { .obj = initializer })
> [...]
> Does that look like what you'd want? (Note I didn't actually build this;
> I want to make sure the concept is workable...)
FWIW, this is working as expected: https://godbolt.org/z/P7Go8Tr33
I'll send a proper patch...
--
Kees Cook
