gcc/testsuite/gcc.dg/Walloca-2.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target alloca } */
   3 /* { dg-options "-Walloca-larger-than=2000 -O2" } */
   4
   5 void f (void *);
   6
   7 void
   8 g1 (int n)
   9 {
  10   void *p;
  11   if (n > 0 && n < 2000)
  12     p = __builtin_alloca (n); // { dg-bogus "unbounded use of 'alloca'" "" }
  13   else
  14     p = __builtin_malloc (n);
  15   f (p);
  16 }
  17
  18 void
  19 g2 (int n)
  20 {
  21   void *p;
  22   if (n < 2000)
  23     p = __builtin_alloca (n); // { dg-warning "may be too large" }
  24   else
  25     p = __builtin_malloc (n);
  26   f (p);
  27 }
  28
  29 void
  30 g3 (int n)
  31 {
  32   void *p;
  33   if (n > 0 && n < 3000)
  34     {
  35       p = __builtin_alloca (n); // { dg-warning "may be too large" }
  36     }
  37   else
  38     p = __builtin_malloc (n);
  39   f (p);
  40 }