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#include <stdio.h>
#include <stdlib.h>
 
struct list {
    int key;
    struct list *next;
};
 
struct list *append(struct list **l1, int k)
{
    *l1 = malloc(sizeof *l1);
    (*l1)->key = k;
    return *l1;
}
 
int main(void)
{
    struct list *p, *l1, l2 = { 42, NULL }, l3 = { 24, NULL };
    int i;
 
    for (p = l1, i = 0; i < 42; ++i)
        p = append(p, i);
 
    for (struct list *p = l1; p != NULL; p = p->next)
        printf("%d\n", p->key);
}
 

cc1: warnings being treated as errors
prog.c: In function ‘main’:
prog.c:22: error: passing argument 1 of ‘append’ from incompatible pointer type
prog.c:18: error: unused variable ‘l3’
prog.c:18: error: unused variable ‘l2’

Standard output is empty