field '' with variable sized type 'union jset::(anonymous at ./usr/include/linux/bcache.h:286:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]

field '' with variable sized type 'union jset::(anonymous at ./usr/include/linux/bcache.h:287:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]