Specify unused parameter

gpio/gpio.c

@@ -499,7 +499,7 @@ void doExport (int argc, char *argv[])
  *	to exit the program. Crude but effective.
  *********************************************************************************
  */
-static void wfi (int pin)
+static void wfi (UNUSED int pin)
 {
   exit (EXIT_SUCCESS);
 }

wiringPi/wiringPi.h

@@ -34,6 +34,7 @@
 
 // GCC warning suppressor - don't warn about unused parameters (-Wunused-parameter)
 #define UNU __attribute__((unused))
+#define UNUSED __attribute__((unused))
 
 // Mask for the bottom 64 pins which belong to the Raspberry Pi
 //    The others are available for the other devices