Unused lint not available in vhdl_lang

[Xcodo]

Unused lint not available in vhdl_lang

[Schottkyc137]

The project, when called from the command line, currently does not perform any unused declaration detection.
@kraigher is there a particular reason for this or was this just overlooked? I don't see a compelling reason at the moment not to enable this.

[kraigher]

The vhdl_lang executable was never really created by me for external users. I added it to be able to quickly check that VHDL LS would cleanly work on real world projects in the example projects. When doing this I did not want to be spammed with unused declarations commonly found in real world projects, I only caree about avoiding false positive errors. But checking for unused declarations could have been an opt out option for vhdl_lang instead of the default.

I think vhdl_lang needs a declared purpose that it can be designed to fit. Maybe its purpose should be running checks for CI as its main role in the future.

[Schottkyc137]

I guess it makes sense. Maybe there should then also be the option to output machine-parsable code (e.g., json) for better integration with pipelines. Unsure if there is a standardised format.
We could also use this in one of our pipelines as integration test to check that the example project parses without errors. This would have been helpful in a couple of PR's where the unit tests didn't catch the regression