Follow-up Comment #6, bug #63111 (project make):
I took a shot at creating a warning. It's not so simple.
I think that the thing we want to warn about is:
* we used a pattern rule with multiple targets to build the wanted target
* the wanted target was actually updated
* some also-make target was not updated
This is because we don't want to raise a warning about a pattern rule that
intentionally doesn't update any of its targets (maybe it decides that things
are up to date even if the timestamps don't show this). We only want to warn
about pattern rules that don't update ALL the targets.
Unfortunately this is not so easy to determine the way things work today. The
main problem is that we don't do all the investigation of an also-make target
that we do of the primary target, so we don't actually know whether it was
updated or not. We can detect whether it was not created at all, but not
whether it was updated. Maybe that's good enough? It won't help the
situation where the also-make file exists but is not up to date and is not
updated by running the recipe: in this case there would be no warning but
(with the changes for bug #12078 ) the target would still be rebuilt every
time you run make.
The smaller problem is that whether the main target was updated or not can
only be determined in specific spots and there are more than one: there's at
least one for goal targets and one for non-goal targets, so we'd need to add
the check in two places.
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