Bare Metal Option

[sstaub]

Describe the solution you'd like
It would nice to have an option to program the Arduino boards without the Arduino framework.
This is possible in PlatformIO, because the #include of Arduino.h is not hidden.

[per1234]

Hi @sstaub. Even though I think the Arduino sketch preprocessor's default behavior of automatically adding the #include directive for Arduino.h to the .ino file is very important for providing beginners with a gentle learning curve, I also think it's nice to allow advanced users to have control over this. Cristian Maglie came up with what I think is the perfect solution to allow this: arduino/Arduino#4352 (comment)

the preprocessor now skips the automatic insertion of the #include <Arduino.h> if the sketch already includes it.

You can combine this feature with a preprocessor conditional to prevent Arduino.h from being included in the sketch. People doing that might also find the ability to override the core library's main() to be handy:

#if false
#include <Arduino.h>
#endif

int main() {
  return 0;
}