[RFC] Mark CATCH cmake variables as advanced

[bernhardmgruber]

I just noticed that we got a lot of cmake variables from Catch2 in the default view of ccmake:

Since I don't think that we should tamper with these variables, I would like to mark them as advanced in cmake, so they are hidden by default.

[j-stephan]

I don't think this is the right approach. We should probably use ExternalProject(https://cmake.org/cmake/help/v3.18/module/ExternalProject.html) instead.

[bernhardmgruber]

If that gets rid of the CATCH_* cmake variables, I am all for it!

[bernhardmgruber]

@j-stephan are you going to do the thing with ExternalProject? If not, are you fine with my suggested approach? If not, then I would close the issue.

[j-stephan]

Not right now, but I'm still for trying out ExternalProject. Shouldn't be that hard I think.

[bernhardmgruber]

Ok then, go for it! :)

[j-stephan]

I just tried it with FetchContent which should be really similar to ExternalProject. The variables still show up in ccmake so feel free to try out your approach.