[Bug c++/69550] Need a way to disable "flexible array member in an otherwise empty struct" error on GCC 6

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69550

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
(In reply to Milan Bouchet-Valat from comment #5)
> Note this actually also happens with the C compiler (the attached example
> also illustrates this).

That's the correct behavior.