`Blink.ino` does not compile for Nicla Sense ME, unless `#include "Nicla_System"`

[aliphys]

Describe the problem

The Blink sketch does not run without modification on the Nicla Sense ME. It is required to add the #include "Nicla_System.h" directive, in order for the sketch to compile and successfully upload.

To reproduce

1. Open Blink.ino from File -> Examples -> 01.Basics -> Blink.
2. Connect the Nicla Sense ME board and select from the drop down menu
3. Compile. A message informing the user to include the Nicla_System.h library is given in the bottom right corner

/tmp/.arduinoIDE-unsaved2023327-15341-54bj3y.wzmz7/Blink/Blink.ino: In function 'void setup()':
/tmp/.arduinoIDE-unsaved2023327-15341-54bj3y.wzmz7/Blink/Blink.ino:29:10: error: call to 'pinMode' declared with attribute error: Please include Nicla_System.h to use this pin
   pinMode(LED_BUILTIN, OUTPUT);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
/tmp/.arduinoIDE-unsaved2023327-15341-54bj3y.wzmz7/Blink/Blink.ino: In function 'void loop()':
/tmp/.arduinoIDE-unsaved2023327-15341-54bj3y.wzmz7/Blink/Blink.ino:34:15: error: call to 'digitalWrite' declared with attribute error: Please include Nicla_System.h to use this pin
   digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
/tmp/.arduinoIDE-unsaved2023327-15341-54bj3y.wzmz7/Blink/Blink.ino:36:15: error: call to 'digitalWrite' declared with attribute error: Please include Nicla_System.h to use this pin
   digitalWrite(LED_BUILTIN, LOW);   // turn the LED off by making the voltage LOW
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~

exit status 1

Compilation error: call to 'pinMode' declared with attribute error: Please include Nicla_System.h to use this pin

4. Add #include "Nicla_System.h" just above the setup() function.
5. Compile again, which will be successful.

Sketch uses 55788 bytes (10%) of program storage space. Maximum is 527616 bytes.
Global variables use 12256 bytes (19%) of dynamic memory, leaving 52032 bytes for local variables. Maximum is 64288 bytes.

7. After uploading, all three RGB LEDs will start blinking together (white light)

Expected behavior

It is NOT required to add `#include "Nicla_System.h" to the sketch. Based on the selected FQBN, the compiler should add the directive if required.

The examples version

https://github.com/arduino/arduino-examples/commit/dfedf56610d6110887e227e114c11c2ba4211fb7

Additional context

The Blink sketch is the de-facto Hello World example, and often the first sketch users upload to their board. Replicated on IDE 1 and Web Editor also.

Issue checklist

• [X] I searched for previous reports in the issue tracker
• [X] I verified the problem still occurs when using the latest version
• [X] My report contains all necessary details

[aliphys]

While there is a dedicated Blink_Nicla.ino sketch, the Blink.ino sketch should work with all boards.

• https://github.com/arduino/ArduinoCore-mbed/issues/615

[facchinm]

The error directive was added to target EXACTLY that case; I think it's more than enough to drive the user to add the include (which is enough to make everything work automatically)