ardupilot/libraries/AP_HAL_Empty/examples/empty_example/empty_example.cpp

#include <AP_HAL.h>
#include <AP_Common.h>
#include <AP_Progmem.h>
#include <AP_Param.h>
#include <StorageManager.h>
#include <AP_Math.h>

#include <AP_HAL_AVR.h>
#include <AP_HAL_SITL.h>
#include <AP_HAL_Empty.h>

const AP_HAL::HAL& hal = AP_HAL_BOARD_DRIVER;

void setup() {
	hal.console->println_P(PSTR("Empty setup"));
}
void loop() {}

AP_HAL_MAIN();