[hedora]

I suggest reading “recursive make considered harmful”. It is a wonderful introduction to make, and explains how to avoid a few pitfalls most make users (including this article) run into.

In particular, the targets in the subdirectory makefiles can and should be auto-generated using make itself. There’s no need for the makefiles in the subdirectories (there is also no need to use an external tool to generate them, which is the other mistake people often make).