https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89592
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> --- It depends if the users can expect that they can actually access the flexible array members or if it is like if they declare a new variable with that type without initializer and then copy it over. In the latter case the flexible array member can't be dereferenced.
