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

   1 /* PR middle-end/82063 - issues with arguments enabled by -Wall
   2    { dg-do compile }
   3    { dg-options "-O2 -Walloca-larger-than=0 -Wvla-larger-than=0 -ftrack-macro-expansion=0" } */
   4
   5 extern void* alloca (__SIZE_TYPE__);
   6
   7 void sink (void*);
   8
   9 #define T(x) sink (x)
  10
  11 void test_alloca (void)
  12 {
  13   /* Verify that alloca(0) is diagnosed even if the limit is zero.  */
  14   T (alloca (0));   /* { dg-warning "argument to .alloca. is zero" } */
  15   T (alloca (1));   /* { dg-warning "argument to .alloca. is too large" } */
  16 }
  17
  18 void test_vla (unsigned n)
  19 {
  20   /* VLAs smaller than 32 bytes are optimized into ordinary arrays.  */
  21   if (n < 1 || 99 < n)
  22     n = 1;
  23
  24   char a[n];        /* { dg-warning "argument to variable-length array " } */
  25   T (a);
  26 }