gcc/testsuite/g++.dg/conversion/nullptr1.C

/* Test for overflow in NULL pointer constant.  */
/* { dg-do compile } */

#include <limits.h>

void *p = 0;

void *q = 0 * (INT_MAX + 1);  // { dg-error "invalid conversion" }
// { dg-warning "integer overflow in expression" "" { target *-*-* } .-1 }