Simple 'depend on extra file' case not working
https://github.com/AndiDog/cmake-depend-on-file-issue is a minimal example and the CMakeLists.txt + README show my problem. To me, this looks like a very basic and important use case of CMake: adding a (non-generated) file as separate dependency to a top-level target should just work. Tried quite a few things to no avail.