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* doc/make.texi (Chained Rules): [SV 60904] Clarify intermediate files.

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Paul Smith 2021-09-06 10:46:52 -04:00
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doc/make.texi
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@ -10007,11 +10007,13 @@ files. But intermediate files are treated differently in two ways.
The first difference is what happens if the intermediate file does not
exist. If an ordinary file @var{b} does not exist, and @code{make}
considers a target that depends on @var{b}, it invariably creates
@var{b} and then updates the target from @var{b}. But if @var{b} is an
intermediate file, then @code{make} can leave well enough alone. It
won't bother updating @var{b}, or the ultimate target, unless some
prerequisite of @var{b} is newer than that target or there is some other
reason to update that target.
@var{b} and then updates the target from @var{b}. But if @var{b} is
an intermediate file, then @code{make} can leave well enough alone:
it won't create @var{b} unless one of its prerequisites is out of
date. This means the target depending on @var{b} won't be rebuilt
either, unless there is some other reason to update that target: for
example the target doesn't exist or a different prerequisite is newer
than the target.
The second difference is that if @code{make} @emph{does} create @var{b}
in order to update something else, it deletes @var{b} later on after it