Wrap the watchdog in #ifdefs and disable it for now. My poor imagination

can't think of a situation where resetting the controller in the middle
of a build would be useful. Even hanging ist better :-/

The difference in program size is just 238 bytes.

config.h.dist

@@ -92,6 +92,11 @@ firmware build options
 */
 #define	MOVEBUFFER_SIZE	8
 
+/*
+	FiveD on Arduino implements a watchdog, which has to be reset every 250ms or it will reboot the controller. As rebooting (and letting the GCode sending application trying to continue the build with a then different Home point) is probably even worse than just hanging, and there is no better restore code in place, this is disabled for now.
+*/
+// #define USE_WATCHDOG
+
 /*
 	analog subsystem stuff
 	REFERENCE - which analog reference to use. see analog.h for choices

watchdog.c

@@ -1,5 +1,8 @@
+
 #include	"watchdog.h"
 
+#ifdef USE_WATCHDOG
+
 #include	<avr/wdt.h>
 #include	<avr/interrupt.h>
 
@@ -40,3 +43,5 @@ void wd_reset() {
 		wd_flag &= ~1;
 	}
 }
+
+#endif /* USE_WATCHDOG */

watchdog.h

@@ -1,6 +1,10 @@
 #ifndef	_WATCHDOG_H
 #define	_WATCHDOG_H
 
+#include "config.h"
+
+#ifdef USE_WATCHDOG
+
 // initialize
 void wd_init(void) __attribute__ ((cold));
 
@@ -9,4 +13,10 @@ void wd_reset(void);
 
 // notable lack of disable function
 
+#else /* USE_WATCHDOG */
+
+#define wd_init()  /* empty */
+#define wd_reset() /* empty */
+
+#endif	/* USE_WATCHDOG */
 #endif	/* _WATCHDOG_H */