Follow-up Comment #3, bug #47715 (project make):
Sure, because when make tries to build "a/foo.o" it finds the pattern rule and
it assumes when the recipe is run it has produced the output files "a/foo.o",
"b/foo.o", and "c/foo.o" (because that's what your rule says it does, and make
believes you).
If it then is asked to build "b/foo.o", make says "hey, I already built that
as a result of running this recipe so I don't need to run it again".
But if you ask to build "b/bar.o", then make doesn't believe that this file is
already built so it matches the recipe again, this time with a stem of "bar",
and believes that the recipe builds the files "a/bar.o", "b/bar.o", and
"c/bar.o".
Probably it's better to email help-m...@gnu.org to get instruction and help on
these issues, rather than doing it through the bug tracking system.
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