Questions had been:
A) names of macro and arguments okay?
B) other/similar/related use cases which should be covered?
C) how to design argument passing for all the arg1, arg2, arg3? Is the currrent approach sane or how to support someone needing some arg5?

No answers all the time mapped to: current approach okay :)

For usage & purpose of this macro see D11294, D11295, D11296

Also related:

• intermediate non-ecm-macro-based fixes for KF5 modules by D10733, D10732, D10724
• related CMake issue https://gitlab.kitware.com/cmake/cmake/issues/17750

Would push Monday, March 19th if no-one objects or has some comment.

LGTM
Do you think it would be possible to come up with a test for it?

In D10749#225709, @apol wrote:

LGTM

Thanks for having had a look :)

Do you think it would be possible to come up with a test for it?

Sadly no experience with cmake stuff testing and no initial idea how to write such tests. So would need some days of work, where I have other things more appealing to me :(