cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_shm/struct-shmid_ds-shm_segsz.c -o sys_shm/struct-shmid_ds-shm_segsz -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
sys_shm/struct-shmid_ds-shm_segsz.c:10:10: error: incompatible pointer types initializing 'size_t *' (aka 'unsigned long *') with an expression of type 'int *' [-Werror,-Wincompatible-pointer-types]
        size_t *qux = &bar->shm_segsz;
                ^     ~~~~~~~~~~~~~~~
1 error generated.