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#include <stdio.h>
 
void func(int **p) {
  printf("Pointer is at %p\n", (void *)p);
}
 
int main(void) {
  int *p;
  func(p);
  func(&p);
  int **pp = &p;
  func(&pp);
  return 0;
}

prog.c: In function 'main':
prog.c:9:8: error: passing argument 1 of 'func' from incompatible pointer type [-Werror]
   func(p);
        ^
prog.c:3:6: note: expected 'int **' but argument is of type 'int *'
 void func(int **p) {
      ^
prog.c:12:8: error: passing argument 1 of 'func' from incompatible pointer type [-Werror]
   func(&pp);
        ^
prog.c:3:6: note: expected 'int **' but argument is of type 'int ***'
 void func(int **p) {
      ^
cc1: all warnings being treated as errors

Standard output is empty