+#define weak __attribute__((weak))
+#define noret __attribute__((noreturn))
+
+#define stringify(v) #v
+#define stringify__(v) stringify(v)
+
+inline static void noret
+spin()
+{
+ volatile int __infloop = 1;
+ while (__infloop)
+ ;
+ __builtin_unreachable();
+}