gcc/testsuite/gcc.dg/Wvla-larger-than-3.c

   1 /* Verify that VLA definitions with an unknown upper bound don't trigger
   2    -Wvla-larger-than= warnings by default.
   3    { dg-do compile }
   4    { dg-require-effective-target alloca }
   5    { dg-options "-O2 -Wall" } */
   6
   7 void f (void *, ...);
   8
   9 void nowarn_vla_int (int n)
  10 {
  11   char a[n];
  12
  13   if (n < 1234)
  14     n = 1234;
  15
  16   char b[n];
  17   f (a, b);
  18 }
  19
  20 void nowarn_vla_uint (unsigned n)
  21 {
  22   char a[n];
  23   f (a);
  24
  25   if (n < 2345)
  26     n = 2345;
  27
  28   char b[n];
  29   f (a, b);
  30 }
  31
  32 void nowarn_vla_long (long n)
  33 {
  34   char a[n];
  35
  36   if (n < 1234)
  37     n = 1234;
  38
  39   char b[n];
  40   f (a, b);
  41 }
  42
  43 void nowarn_vla_ulong (unsigned long n)
  44 {
  45   char a[n];
  46   f (a);
  47
  48   if (n < 2345)
  49     n = 2345;
  50
  51   char b[n];
  52   f (a, b);
  53 }
  54
  55 /* Verify that a VLA whose size is definitely in excess of PTRDIFF_MAX
  56    is diagnosed by default.  */
  57
  58 void warn_vla (__PTRDIFF_TYPE__ n)
  59 {
  60   int a[n];
  61   f (a);
  62
  63   if (n <= __PTRDIFF_MAX__)
  64     n = __PTRDIFF_MAX__;
  65
  66   int b[n];   /* { dg-warning "argument to variable-length array is too large" } */
  67   f (a, b);
  68 }