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* doc/make.texi (Prerequisite Types): [SV 61069] Mention PHONY prereqs

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Paul Smith 2021-09-05 23:28:03 -04:00
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@ -2073,6 +2073,10 @@ declare the same file to be both a normal and an order-only
prerequisite, the normal prerequisite takes precedence (since they
have a strict superset of the behavior of an order-only prerequisite).
Order-only prerequisites are never checked when determining if the
target is out of date; even order-only prerequisites marked as phony
(@pxref{Phony Targets}) will not cause the target to be rebuilt.
Consider an example where your targets are to be placed in a separate
directory, and that directory might not exist before @code{make} is
run. In this situation, you want the directory to be created before