cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations spawn/posix_spawnattr_setschedparam.c -o spawn/posix_spawnattr_setschedparam -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
spawn/posix_spawnattr_setschedparam.c:6:54: error: declaration of 'struct sched_param' will not be visible outside of this function [-Werror,-Wvisibility]
    6 | int (*foo)(posix_spawnattr_t *restrict, const struct sched_param *restrict) = posix_spawnattr_setschedparam;
      |                                                      ^
spawn/posix_spawnattr_setschedparam.c:6:79: error: use of undeclared identifier 'posix_spawnattr_setschedparam'
    6 | int (*foo)(posix_spawnattr_t *restrict, const struct sched_param *restrict) = posix_spawnattr_setschedparam;
      |                                                                               ^
2 errors generated.