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

[nalimilan at club dot fr]

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

--- Comment #5 from Milan Bouchet-Valat <nalimilan at club dot fr> ---
Note this actually also happens with the C compiler (the attached example also
illustrates this).