Index: trunk/src/polygon.c
===================================================================
--- trunk/src/polygon.c	(revision 10208)
+++ trunk/src/polygon.c	(revision 10209)
@@ -705,7 +705,7 @@
 	return np;
 }
 
-/* clear np1 from the polygon */
+/* clear np1 from the polygon - should be inline with -O3 */
 static int Subtract(pcb_polyarea_t * np1, pcb_polygon_t * p, pcb_bool fnp)
 {
 	pcb_polyarea_t *merged = NULL, *np = np1;
@@ -743,6 +743,11 @@
 	return 1;
 }
 
+int pcb_poly_subtract(pcb_polyarea_t *np1, pcb_polygon_t *p, pcb_bool fnp)
+{
+	return Subtract(np1, p, fnp);
+}
+
 /* create a polygon of the pin clearance */
 pcb_polyarea_t *pcb_poly_from_pin(pcb_pin_t * pin, pcb_coord_t thick, pcb_coord_t clear)
 {
Index: trunk/src/polygon.h
===================================================================
--- trunk/src/polygon.h	(revision 10208)
+++ trunk/src/polygon.h	(revision 10209)
@@ -96,5 +96,8 @@
 
 pcb_bool pcb_pline_is_rectangle(pcb_pline_t *pl);
 
+/* clear np1 from the polygon; also free np1 if fnp is true. Returns 1 on
+   success. */
+int pcb_poly_subtract(pcb_polyarea_t *np1, pcb_polygon_t *p, pcb_bool fnp);
 
 #endif