mtime comparison considered harmful

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mtime comparison considered harmful

Gregory Szorc-2
https://apenwarr.ca/log/20181113

This article has a terrific overview on mtime and other file system wonkiness and goes into detail on implications for build systems. There’s even discussion of implications of using file hashes for build system DAGs. As a bonus, it is also a fairly good overview of the ways Make is a bad build system. Overall, a must read/bookmark for build system folks.

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