gcc/testsuite/gcc.dg/pr79538.c

   1 /* PR middle-end/79538 - missing -Wformat-overflow with %s and non-member array arguments
   2    { dg-do compile }
   3    { dg-options "-O2 -Wformat-overflow" } */
   4
   5 char a3[3];
   6 char a4[4];
   7 char d[3];
   8
   9 void g (int i)
  10 {
  11   const char *s = i < 0 ? a3 : a4;
  12   __builtin_sprintf (d, "%s", s);      /* { dg-warning ".__builtin_sprintf. may write a terminating nul past the end of the destination" } */
  13   return;
  14 }
  15
  16 void f ()
  17 {
  18   char des[3];
  19   char src[] = "abcd";
  20   __builtin_sprintf (des, "%s", src); /* { dg-warning "directive writing up to 4 bytes into a region of size 3" } */
  21   return;
  22 }