Serial port to rectify odd and even check problems

cores/arduino/Print.h

@@ -100,9 +100,9 @@ public:
     size_t println(double, int = 2);
     size_t println(const Printable&);
     size_t println(void);
-
+#ifdef SUPPORTS_PRINTF
     int printf(const char * format, ...);
-
+#endif
     virtual void flush() { /* Empty implementation for backward compatibility */ }
 };