This is in Visual Studio 2019, testing code for the Teensy4 board.  Most things are working quite well BUT - I've been experimenting with interrupts  and cli() is showing a red underscore and the above message.

It appears the the first of these macros shows the error, and the remaining interrupt handlers have no error - until i comment out cli() and then the error propagates down to 'noInterrupts() - and so on.

Arduino tool chain is 1.8.9  I just opened the sketch in the Arduino IDE - and there was no complaints on those functions....  So something in either VS2019 or Intellisense is confused.    I guess I should ignore the warnings - but something COULD be amiss inthe VS2019 world.


Ideas?



Below is the test ISR which does get hit at a button press

void ISR_Handler() {
	dummy = 1;
	cli();          <---- has error msg
	noInterrupts();
	//Serial.println("In ISR");
	flag = !flag;
	interrupts();
	sei();
	interrupts();
}