Follow-up Comment #2, bug #45311 (project make):
I think the confusion here has to do with the value of $@. One might
reasonably expect, in a multi-target pattern rule, that $@ would be the list
of all matching out-of-date targets but in fact, according to the
documentation:
"In a pattern rule that has multiple targets (see Introduction to Pattern
Rules), ‘$@’ is the name of whichever target caused the rule’s recipe to
be run."
Which is a bit unclear wrt the case where neither target exists, but does
imply strongly that $@ will refer to just one target.
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