[bug #48643] Irrelevant targets can confuse make on which pattern rule to select.

[Paul D. Smith]

Follow-up Comment #21, bug #48643 (project make):

I thought about this but adding such a note caused it to turn up in somewhat
unusual places.  For example in this test:

all: hello.tsk
%.tsk: %.o; $(info hello.tsk)
%.o: %.c; $(info hello.c)
%.o: %.f %.tsk; $(info hello.f)

we expect to get this output:

  make: Circular hello.o <- hello.tsk dependency dropped.
  hello.f
  hello.tsk


If I add a note when we start the compatibility check, it shows up here
(obviously we'd pick a more informative note if we added this):

  Starting compatibility search
  make: Circular hello.o <- hello.tsk dependency dropped.
  hello.f
  hello.tsk


I guess it's appropriate here but it seemed odd to me.

We should consider it.  I wonder how many existing build systems would trigger
this note?  That would be an interesting statistic.

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