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Buck makes you declare every dependency explicitly. A particular target must specify exactly what files it uses, and when it makes a build, it copies those files from the target and all its dependencies into an empty sandbox and builds there. It's wonderful.

Wonderful until you have a few thousand files you need to declare explicitly.

Or do I misunderstand something here?

https://buckbuild.com/function/glob.html

BTW take a look at tup: it tries to infer dependencies by watching which files each build step actually uses.

Redo enhances the timestamp approach instead: https://apenwarr.ca/log/20181113