(C++) patch re array size in templates

[Jason Merrill]

This fixes the GNU array-of-zero extension in templates.

1999-02-24  Jason Merrill  <jason@yorick.cygnus.com>

	* pt.c (tsubst): Allow an array of explicit size zero.

Index: pt.c
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/gcc/cp/pt.c,v
retrieving revision 1.264
diff -c -p -r1.264 pt.c
*** pt.c	1999/02/21 16:38:19	1.264
--- pt.c	1999/02/24 19:45:28
*************** tsubst (t, args, complain, in_decl)
*** 6017,6025 ****
  	return t;
  
        {
! 	tree max = TREE_OPERAND (TYPE_MAX_VALUE (t), 0);
  
! 	max = tsubst_expr (max, args, complain, in_decl);
  	if (max == error_mark_node)
  	  return error_mark_node;
  
--- 6017,6025 ----
  	return t;
  
        {
! 	tree max, omax = TREE_OPERAND (TYPE_MAX_VALUE (t), 0);
  
! 	max = tsubst_expr (omax, args, complain, in_decl);
  	if (max == error_mark_node)
  	  return error_mark_node;
  
*************** tsubst (t, args, complain, in_decl)
*** 6032,6038 ****
  	    return itype;
  	  }
  
! 	if (integer_zerop (max) || INT_CST_LT (max, integer_zero_node))
  	  {
  	    /* [temp.deduct]
  
--- 6032,6044 ----
  	    return itype;
  	  }
  
! 	if (integer_zerop (omax))
! 	  {
! 	    /* Still allow an explicit array of size zero.  */
! 	    if (pedantic)
! 	      pedwarn ("creating array with size zero");
! 	  }
! 	else if (integer_zerop (max) || INT_CST_LT (max, integer_zero_node))
  	  {
  	    /* [temp.deduct]