Added explicit fall-through comments to pacify GCC.

src/defaults.c

@@ -3378,6 +3378,8 @@ static int setSwPOptions(WScreen * scr, WDefaultEntry * entry, void *tdata, void
 			}
 		}
 
+		/* Fall through. */
+
 	case 1:
 		if (!WMIsPLString(WMGetFromPLArray(array, 0))) {
 			wwarning(_("Invalid arguments for option \"%s\""), entry->key);

src/menu.c

@@ -1591,6 +1591,7 @@ void wMenuScroll(WMenu *menu)
 		switch (ev.type) {
 		case EnterNotify:
 			WMHandleEvent(&ev);
+			/* Fall through. */
 		case MotionNotify:
 			x = (ev.type == MotionNotify) ? ev.xmotion.x_root : ev.xcrossing.x_root;
 			y = (ev.type == MotionNotify) ? ev.xmotion.y_root : ev.xcrossing.y_root;
@@ -1644,6 +1645,7 @@ void wMenuScroll(WMenu *menu)
 			break;
 		case KeyPress:
 			done = 1;
+			/* Fall through. */
 		default:
 			WMHandleEvent(&ev);
 			break;

src/placement.c

@@ -527,6 +527,7 @@ void PlaceWindow(WWindow *wwin, int *x_ret, int *y_ret, unsigned width, unsigned
 	case WPM_CENTER:
 		if (center_place_window(wwin, x_ret, y_ret, width, height, usableArea))
 			break;
+		/* Fall through. */
 
 	case WPM_AUTO:
 		if (autoPlaceWindow(wwin, x_ret, y_ret, width, height, False, usableArea)) {
@@ -538,6 +539,8 @@ void PlaceWindow(WWindow *wwin, int *x_ret, int *y_ret, unsigned width, unsigned
 		   through to cascade placement, as people who want tiling want
 		   automagicness aren't going to want to place their window */
 
+		/* Fall through. */
+
 	case WPM_CASCADE:
 		if (wPreferences.window_placement == WPM_AUTO || wPreferences.window_placement == WPM_CENTER)
 			scr->cascade_index++;