cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations signal/ucontext_t-uc_stack.c -o signal/ucontext_t-uc_stack -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
signal/ucontext_t-uc_stack.c:4:23: error: no member named 'uc_stack' in 'struct sigcontext'
        stack_t *qux = &bar->uc_stack;
                        ~~~  ^
1 error generated.