cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations time/struct-itimerspec-it_interval.c -o time/struct-itimerspec-it_interval -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
time/struct-itimerspec-it_interval.c:2:17: error: declaration of 'struct itimerspec' will not be visible outside of this function [-Werror,-Wvisibility]
    2 | void foo(struct itimerspec* bar)
      |                 ^
time/struct-itimerspec-it_interval.c:4:29: error: incomplete definition of type 'struct itimerspec'
    4 |         struct timespec *qux = &bar->it_interval;
      |                                 ~~~^
time/struct-itimerspec-it_interval.c:2:17: note: forward declaration of 'struct itimerspec'
    2 | void foo(struct itimerspec* bar)
      |                 ^
2 errors generated.