[CMake] how to track package dependencies

[Juan Sanchez]

What would be the best way to tackle having dependencies with multiple
packages?  For example, if package A depends on both packages B and C:

1. To make sure the compiler is the same
2. Know what flags where used for the sources in the dependency
3. Know whether or not the static archive is position independent
4. If package B and C are both dependent on D, that both are using the
same version when creating package A.

Thanks,

Juan