I'm not sure what you mean here. It should use CMake's usual change-detection/dependency-tracking mechanism. [0] The generation of the .h file from the .h.in f

I'm not sure what you mean here. It should use CMake's usual change-detection/dependency-tracking mechanism. [0] The generation of the .h file from the .h.in file does happen at compile-time. (Well, at build time, right before the compiler is invoked.) [0] https://stackoverflow.com/a/24246566/ https://stackoverflow.com/a/24246566/