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

   1 /* PR middle-end/82063 - issues with arguments enabled by -Wall
   2    Verify that alloca() calls in loops are not diagnosed by default.
   3    { dg-do compile }
   4    { dg-options "-O2 -ftrack-macro-expansion=0" } */
   5
   6 extern void* alloca (__SIZE_TYPE__);
   7
   8 void sink (void*);
   9
  10 #define T(x) sink (x)
  11
  12 void test_alloca (unsigned n)
  13 {
  14   /* Verify that alloca(0) is not diagnosed in a loop either.  */
  15   for (unsigned i = 0; i < n; ++i)
  16     T (alloca (0));
  17
  18   /* Verify no warnings for the loops below.  */
  19   for (unsigned i = 0; i < n; ++i)
  20     T (alloca (1));
  21
  22   for (unsigned i = 1; i < n; ++i)
  23     T (alloca (n));
  24 }