>ability to define your own functions to determine if a target is up-to-date. Yes! A modular make-like would allow the tool to fit any scale. Imagine not only

>ability to define your own functions to determine if a target is up-to-date. Yes! A modular make-like would allow the tool to fit any scale. Imagine not only being able to define the up-to-date function, but being able to plug into remote build caches, and perform remote execution of build rules. There are already tools like this, such as Bazel, but they are less appropriate for the small scale than Make. The closest that I know of is BuildKit and related projects.