Index: trunk/src/drc.c
===================================================================
--- trunk/src/drc.c	(revision 32930)
+++ trunk/src/drc.c	(revision 32931)
@@ -152,8 +152,11 @@
 
 void pcb_drc_all(void)
 {
+	int ran = 0;
 	pcb_view_list_free_fields(&pcb_drc_lst);
-	rnd_event(&PCB->hidlib, PCB_EVENT_DRC_RUN, NULL);
+	rnd_event(&PCB->hidlib, PCB_EVENT_DRC_RUN, "p", &ran);
+	if (ran == 0)
+		rnd_message(RND_MSG_ERROR, "No DRC tests ran. Is any DRC plugin compiled? Are they disabled? Are all rules disabled?\n");
 }
 
 static const char pcb_acts_DRC[] = "DRC([list|simple|print|log|dump])";
Index: trunk/src/event.h
===================================================================
--- trunk/src/event.h	(revision 32930)
+++ trunk/src/event.h	(revision 32931)
@@ -53,7 +53,7 @@
 
 	PCB_EVENT_DRAW_CROSSHAIR_CHATT,       /* called from crosshair code upon attached object recalculation; event handlers can use this hook to enforce various geometric restrictions */
 
-	PCB_EVENT_DRC_RUN,                    /* called from core to run all configured DRCs (implemented in plugins) */
+	PCB_EVENT_DRC_RUN,                    /* called from core to run all configured DRCs (implemented in plugins). Args: (int *) that each DRC plugin shall increase if it did any check */
 
 	PCB_EVENT_NET_INDICATE_SHORT,         /* called by core to get a shortcircuit indicated (e.g. by mincut). Args: (pcb_net_t *net, pcb_any_obj_t *offending_term, pcb_net_t *offending_net, int *handled, int *cancel) - if *handled is non-zero, the short is already indicated; if *cancel is non-zero the whole process is cancelled, no more advanced short checking should take place in this session */
 
Index: trunk/src_plugins/drc_query/drc_query.c
===================================================================
--- trunk/src_plugins/drc_query/drc_query.c	(revision 32930)
+++ trunk/src_plugins/drc_query/drc_query.c	(revision 32931)
@@ -227,7 +227,7 @@
 	gdl_iterator_t it;
 	rnd_conf_listitem_t *i;
 	long cnt = 0;
-	int bufno = -1;
+	int bufno = -1, *ran;
 	pcb_qry_exec_t ec;
 	drc_query_prog_t prog;
 
@@ -255,6 +255,10 @@
 		if ((dis != NULL) && (*dis != 0))
 			continue;
 
+		assert(argv[1].type == RND_EVARG_PTR);
+		ran = argv[1].d.p;
+		(*ran)++;
+
 		prog.name = i->name;
 		cnt += drc_qry_exec(&ec, pcb, &pcb_drc_lst, i->name,
 			load_str(rule, i, "type"), load_str(rule, i, "title"), load_str(rule, i, "desc"),