cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations fcntl/struct-flock-l_whence.c -o fcntl/struct-flock-l_whence -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
fcntl/struct-flock-l_whence.c:2:17: error: ‘struct flock’ declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
    2 | void foo(struct flock* bar)
      |                 ^~~~~
fcntl/struct-flock-l_whence.c: In function ‘foo’:
fcntl/struct-flock-l_whence.c:4:26: error: invalid use of undefined type ‘struct flock’
    4 |         short *qux = &bar->l_whence;
      |                          ^~
cc1: all warnings being treated as errors