https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69550
--- Comment #18 from Milan Bouchet-Valat <nalimilan at club dot fr> --- FWIW, Debian has identified a few packages failing to build with the "flexible array member in otherwise empty struct" error under GCC 6: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=812023 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=812024 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=812026 Not sure whether these affect public API or not.