So when you run make without changing any of the dependencies it says target upto date. I was curious how it keeps track of changes to the files, does it have some kind of revision control system under the hood. If so, where are these files stored?
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abc def foo bar
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No, it just compares the last-modified dates of the files.
If the target is newer than all of its dependencies, it's up to date. Otherwise the relevant dependencies are re-built.
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Also see [this](https://stackoverflow.com/a/2145605/4179032) for "commands" (not representing physical files) like `clean` and `install` as targets – Leponzo Jul 03 '21 at 05:11