Strict check on libraries should check for header guards or #pragma once

[Strooom]

I think a header file for a library should always have either header guards or #pragme once, so the linter should check for that.
I checked a library without that, and it passed the checks..

[per1234]

Thanks for your suggestion @Strooom.

Linting of C++ is outside the scope of the Arduino Lint project. The reason is that there are already a tremendous number of excellent tools for C++ code. So there is no need for Arduino to produce another one.

The opportunity for us to provide something of value is in the area of Arduino-specific things such as the library.properties metadata file, Library Manager compliance, sketch folder structure, boards platform configuration files, package index data, etc.

[Strooom]

I understand, but I think the #pragma once check belongs more to the structure of a good library, than to the C++ contents of it. Anyway, thanks for your fast response and thank you for Arduino Lint