Follow-up Comment #6, bug #66500 (group make): [comment #5 comment #5:] > The rule for foo/tar is lacking a recipie. In this case make has no reason to > invalidate the cached mtime of foo/tar. As explained earlier make has no idea > that the recipie for foo touched foo/tar. Any recipie for foo/tar, even a > empty one, is sufficient to tell make to invalidate the cached mtime of > foo/tar.
POSIX make specification says:
"The make utility shall use the modification times of files to determine
whether the corresponding targets are out-of-date."
If timestamp caching causes different behaviour than reading them from
filesystem, it is a bug.
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