[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 #4 from Milan Bouchet-Valat <nalimilan at club dot fr> ---
Yes, -fpermissive is a better solution. The code at stake has been replaced in
the master branch, but breaking API in stable releases isn't great.