+void __attribute__ ((format (printf, 2, 3))) _pb_debug_fn(const char *func,
+ const char *fmt, ...);
+#define pb_debug_fn(args...) _pb_debug_fn(__func__, args)
+void __attribute__ ((format (printf, 3, 4))) _pb_debug_fl(const char *func,
+ int line, const char *fmt, ...);
+#define pb_debug_fl(args...) _pb_debug_fl(__func__, __LINE__, args)