On Tue, Sep 12, 2023 at 07:22:24PM +0300, Alexey Dobriyan wrote:
> __DECLARE_FLEX_ARRAY(T, member) macro expands to
>
> struct {
> struct {} __empty_member;
> T member[];
> };
>
> which is subtly wrong in C++ because sizeof(struct{}) is 1 not 0,
> changing UAPI structures layouts.
Looking at this again just now, what about using a 0-length array
instead of an anonymous struct?
https://godbolt.org/z/rGaxPWjef
Then we don't need an #ifdef at all...
struct {
int __empty_member[0];
T member[];
};
-Kees
--
Kees Cook
