gcc/testsuite/gcc.dg/Wvla-larger-than-1.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target alloca } */
   3 /* { dg-options "-Wvla-larger-than=100 -O2" } */
   4
   5 typedef __SIZE_TYPE__ size_t;
   6
   7 extern void useit (char *);
   8
   9 int num;
  10
  11 void test_vlas (size_t num)
  12 {
  13   char str2[num];               /* { dg-warning "unbounded use" } */
  14   useit(str2);
  15
  16   num = 98;
  17   for (int i=0; i < 1234; ++i) {
  18     char str[num];              // OK, VLA in a loop, but it is a
  19                                 // known size *AND* the compiler takes
  20                                 // care of cleaning up between
  21                                 // iterations with
  22                                 // __builtin_stack_restore.
  23     useit(str);
  24   }
  25 }