Index: trunk/src_plugins/export_gcode/gcode.c
===================================================================
--- trunk/src_plugins/export_gcode/gcode.c	(revision 17247)
+++ trunk/src_plugins/export_gcode/gcode.c	(revision 17248)
@@ -669,11 +669,14 @@
 			type = 'C';
 			r = pcb_to_gcode(gc->width / 2 + gcode_toolradius);
 			break;
-		default:
 		case pcb_cap_square:
 			r = pcb_to_gcode(gc->width + gcode_toolradius * 2);
 			type = 'S';
 			break;
+		default:
+			assert(!"unhandled cap");
+			r = 1;
+			type = 'C';
 		}
 		sprintf(name, "#%.2x%.2x%.2x_%c_%d", gc->color->r, gc->color->g, gc->color->b, type, r);
 
Index: trunk/src_plugins/export_gerber/gerber.c
===================================================================
--- trunk/src_plugins/export_gerber/gerber.c	(revision 17247)
+++ trunk/src_plugins/export_gerber/gerber.c	(revision 17248)
@@ -960,10 +960,12 @@
 		case pcb_cap_round:
 			shape = ROUND;
 			break;
-		default:
 		case pcb_cap_square:
 			shape = SQUARE;
 			break;
+		default:
+			assert(!"unhandled cap");
+			shape = ROUND;
 		}
 		aptr = findAperture(curr_aptr_list, linewidth, shape);
 		if (aptr == NULL)
Index: trunk/src_plugins/export_nelma/nelma.c
===================================================================
--- trunk/src_plugins/export_nelma/nelma.c	(revision 17247)
+++ trunk/src_plugins/export_nelma/nelma.c	(revision 17248)
@@ -775,11 +775,14 @@
 			type = 'C';
 			r = pcb_to_nelma(gc->width / 2);
 			break;
-		default:
 		case pcb_cap_square:
 			r = pcb_to_nelma(gc->width);
 			type = 'S';
 			break;
+		default:
+			assert(!"unhandled cap");
+			type = 'C';
+			r = 1;
 		}
 		sprintf(name, "#%.2x%.2x%.2x_%c_%d", gc->color->r, gc->color->g, gc->color->b, type, r);
 
Index: trunk/src_plugins/export_png/png.c
===================================================================
--- trunk/src_plugins/export_png/png.c	(revision 17247)
+++ trunk/src_plugins/export_png/png.c	(revision 17248)
@@ -1477,10 +1477,12 @@
 		case pcb_cap_round:
 			type = 'C';
 			break;
-		default:
 		case pcb_cap_square:
 			type = 'S';
 			break;
+		default:
+			assert(!"unhandled cap");
+			type = 'C';
 		}
 		if (gc->width)
 			r = SCALE(gc->width + 2 * bloat);
Index: trunk/src_plugins/export_ps/eps.c
===================================================================
--- trunk/src_plugins/export_ps/eps.c	(revision 17247)
+++ trunk/src_plugins/export_ps/eps.c	(revision 17248)
@@ -494,10 +494,12 @@
 		case pcb_cap_round:
 			c = 1;
 			break;
-		default:
 		case pcb_cap_square:
 			c = 2;
 			break;
+		default:
+			assert(!"unhandled cap");
+			c = 1;
 		}
 		fprintf(f, "%d setlinecap\n", c);
 		lastcap = gc->cap;
Index: trunk/src_plugins/export_ps/ps.c
===================================================================
--- trunk/src_plugins/export_ps/ps.c	(revision 17247)
+++ trunk/src_plugins/export_ps/ps.c	(revision 17248)
@@ -1041,10 +1041,12 @@
 		case pcb_cap_round:
 			c = 1;
 			break;
-		default:
 		case pcb_cap_square:
 			c = 2;
 			break;
+		default:
+			assert(!"unhandled cap");
+			c = 1;
 		}
 		fprintf(global.f, "%d setlinecap %d setlinejoin\n", c, c);
 		lastcap = gc->cap;
Index: trunk/src_plugins/export_svg/svg.c
===================================================================
--- trunk/src_plugins/export_svg/svg.c	(revision 17247)
+++ trunk/src_plugins/export_svg/svg.c	(revision 17248)
@@ -84,6 +84,9 @@
 			return "round";
 		case pcb_cap_square:
 			return "square";
+		default:
+			assert(!"unhandled cap");
+			return "round";
 	}
 	return "";
 }
Index: trunk/src_plugins/hid_gtk2_gdk/gtkhid-gdk.c
===================================================================
--- trunk/src_plugins/hid_gtk2_gdk/gtkhid-gdk.c	(revision 17247)
+++ trunk/src_plugins/hid_gtk2_gdk/gtkhid-gdk.c	(revision 17248)
@@ -601,6 +601,10 @@
 		gc->cap = GDK_CAP_PROJECTING;
 		gc->join = GDK_JOIN_MITER;
 		break;
+	default:
+		assert(!"unhandled cap");
+		gc->cap = GDK_CAP_ROUND;
+		gc->join = GDK_JOIN_ROUND;
 	}
 	if (gc->pixel_gc)
 		gdk_gc_set_line_attributes(gc->pixel_gc, Vz(gc->width), GDK_LINE_SOLID, (GdkCapStyle) gc->cap, (GdkJoinStyle) gc->join);
Index: trunk/src_plugins/hid_gtk3_cairo/gtkhid-cairo.c
===================================================================
--- trunk/src_plugins/hid_gtk3_cairo/gtkhid-cairo.c	(revision 17247)
+++ trunk/src_plugins/hid_gtk3_cairo/gtkhid-cairo.c	(revision 17248)
@@ -766,6 +766,8 @@
 		cap = CAIRO_LINE_CAP_SQUARE;
 		join = CAIRO_LINE_JOIN_MITER;
 		break;
+	default:
+		assert(!"unhandled cap");
 	}
 	gc->cap = cap;
 	gc->join = join;
Index: trunk/src_plugins/hid_lesstif/main.c
===================================================================
--- trunk/src_plugins/hid_lesstif/main.c	(revision 17247)
+++ trunk/src_plugins/hid_lesstif/main.c	(revision 17248)
@@ -3006,9 +3006,9 @@
 		join = JoinRound;
 		break;
 	default:
-		cap = CapProjecting;
-		join = JoinBevel;
-		break;
+		assert(!"unhandled cap");
+		cap = CapRound;
+		join = JoinRound;
 	}
 	if (gc->xor_set) {
 		XSetFunction(display, my_gc, GXxor);
Index: trunk/src_plugins/lib_hid_gl/hidgl.c
===================================================================
--- trunk/src_plugins/lib_hid_gl/hidgl.c	(revision 17247)
+++ trunk/src_plugins/lib_hid_gl/hidgl.c	(revision 17248)
@@ -339,6 +339,10 @@
 			x2 += deltax * width / 2. / length;
 			y2 += deltay * width / 2. / length;
 			break;
+
+		default:
+			assert(!"unhandled cap");
+			circular_caps = 1;
 		}
 
 		drawgl_add_triangle(x1 - wdx, y1 - wdy, x2 - wdx, y2 - wdy, x2 + wdx, y2 + wdy);