Serial was not declared

[saitoib]

Hi, all

In case of Separate compilation, using Serial.print in the ico file

'Serial' was not declared in this scope

It will result in an error with.
In cpp or h file, I should declare extern, but what should be declared as Serial's type ?

Or, where is it defined ?

Thank you.

[pert]

saitoib:
Or, where is it defined ?

Here:

arduino/Arduino/blob/1.8.5/hardware/arduino/avr/cores/arduino/HardwareSerial.h#L143

Your post is extremely unclear but you should be aware that the Arduino IDE automatically adds the line:

#include <Arduino.h>

to every sketch prior to compilation.

[saitoib]

I solved it.

Thank you very much.