Subversion Repositories openrisc_2011-10-31

/* Test for constant expressions: cases involving VLAs and typeof.  */

/* Origin: Joseph Myers <joseph@codesourcery.com> */

/* { dg-do compile } */

/* { dg-options "-std=gnu99 -pedantic-errors" } */

/* It appears address constants may contain casts to variably modified

   types.  Whether they should be permitted was discussed in

   <http://groups.google.com/group/comp.std.c/msg/923eee5ab690fd98>

   <LV7g2Vy3ARF$Ew9Q@romana.davros.org>; since static pointers to VLAs

   are definitely permitted within functions and may be initialized

   and such initialization involves implicit conversion to a variably

   modified type, allowing explicit casts seems appropriate.  Thus,

   GCC allows them as long as the "evaluated" size expressions do not

   contain the various operators not permitted to be evaluated in a

   constant expression, and as long as the result is genuinely

   constant (meaning that pointer arithmetic using the size of the VLA

   is generally not permitted).  */

static int sa[100];

int

f (int m, int n)

{

  static int (*a1)[n] = &sa;

  static int (*a2)[n] = (__typeof__(int (*)[n]))sa;

  static int (*a3)[n] = (__typeof__(int (*)[(int){m++}]))sa; /* { dg-error "constant" } */

  static int (*a4)[n] = (__typeof__((int (*)[n])sa))sa;

  static int (*a5)[n] = (__typeof__((int (*)[m++])sa))sa; /* { dg-error "constant" } */

  static int (*a6)[n] = (__typeof__((int (*)[100])(int (*)[m++])sa))sa;

  static int (*a7)[n] = (__typeof__((int (*)[n])sa + m++))sa; /* { dg-error "constant" } */

  return n;

}