FetchContent, find_package, and missing package files

[craig.scott]

If the dependency defines a <project>_VERSION variable at all, it would be in the project’s scope and would not be visible in the scope where FetchContent_MakeAvailable() was called. I alluded to that in my earlier comment:

@craig.scott

There is a proposal discussed somewhere in the CMake issue tracker for a way to potentially extract some sort of version information based on the dependency’s top level project version, but that’s at best a partial heuristic, not a robust equivalent.