cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations fcntl/struct-f_owner_ex-type.c -o fcntl/struct-f_owner_ex-type -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
fcntl/struct-f_owner_ex-type.c:2:17: error: 'struct f_owner_ex' declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
 void foo(struct f_owner_ex* bar)
                 ^~~~~~~~~~
fcntl/struct-f_owner_ex-type.c: In function 'foo':
fcntl/struct-f_owner_ex-type.c:4:17: error: dereferencing pointer to incomplete type 'struct f_owner_ex'
  int *qux = &bar->type;
                 ^~
cc1: all warnings being treated as errors