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#if ARDUINO_USB_CDC_ON_BOOT
  #define S3USBSerial Serial
#else
  #if ARDUINO_USB_MODE
    #define S3USBSerial USBSerial
  #else
    #error "Please, board settings -> USB CDC On Boot=Enabled"
  #endif
#endif
 
void setup() {
  S3USBSerial.begin(115200);
}
 
void loop() {
  static int cnt = 0;
  cnt++;
  S3USBSerial.printf("cnt = %d\n", cnt);
  delay(100);
}

prog.cpp:7:6: error: #error "Please, board settings -> USB CDC On Boot=Enabled"
     #error "Please, board settings -> USB CDC On Boot=Enabled"
      ^~~~~
prog.cpp: In function ‘void setup()’:
prog.cpp:12:3: error: ‘S3USBSerial’ was not declared in this scope
   S3USBSerial.begin(115200);
   ^~~~~~~~~~~
prog.cpp: In function ‘void loop()’:
prog.cpp:18:3: error: ‘S3USBSerial’ was not declared in this scope
   S3USBSerial.printf("cnt = %d\n", cnt);
   ^~~~~~~~~~~
prog.cpp:19:3: error: ‘delay’ was not declared in this scope
   delay(100);
   ^~~~~

Standard output is empty