Added writing forward declaration of dispinterface.

tools/widl/header.c

@@ -682,7 +682,8 @@ void write_forward(type_t *iface)
    * attributes - however, if we don't have a full definition at this point
    * (i.e. this is an IDL forward), then we also assume that it is an object
    * interface, since non-object interfaces shouldn't need forwards */
-  if ((!iface->defined || is_object(iface->attrs)) && !iface->written) {
+  if ((!iface->defined || is_object(iface->attrs) || is_attr(iface->attrs, ATTR_DISPINTERFACE))
+        && !iface->written) {
     fprintf(header,"#ifndef __%s_FWD_DEFINED__\n", iface->name);
     fprintf(header,"#define __%s_FWD_DEFINED__\n", iface->name);
     fprintf(header, "typedef struct %s %s;\n", iface->name, iface->name);

tools/widl/parser.y

@@ -595,7 +595,7 @@ dispinterface: tDISPINTERFACE aIDENTIFIER	{ $$ = get_type(0, $2, 0); }
 dispinterfacehdr: attributes dispinterface	{ $$ = $2;
 						  if ($$->defined) yyerror("multiple definition error\n");
 						  $$->attrs = $1;
-						/*  $$->attrs = make_attr(ATTR_DISPINTERFACE); */
+						  $$->attrs = make_attr(ATTR_DISPINTERFACE);
 						/*  LINK($$->attrs, $1); */
 						  $$->ref = find_type("IDispatch", 0);
 						  if (!$$->ref) yyerror("IDispatch is undefined\n");

tools/widl/widltypes.h

@@ -98,6 +98,7 @@ enum attr_type
     ATTR_V1ENUM,
     ATTR_VERSION,
     ATTR_WIREMARSHAL,
+    ATTR_DISPINTERFACE
 };
 
 enum expr_type