There is DJB's redo[1], which has some implementations. Also, one could probably modify make to use hashes. But personally I think that mtime is a nice compro

There is DJB's redo[1], which has some implementations. Also, one could probably modify make to use hashes. But personally I think that mtime is a nice compromise, as it's often a correct heuristic, and hashing files is not cheap, especially for big projects that'd have a performance penalty. [1] https://cr.yp.to/redo.html https://cr.yp.to/redo.html