[bug #59490] target may not be remade if prerequisite has no recipe

[Greg Minshall]

Follow-up Comment #5, bug #59490 (project make):

thanks, both.

i apologize for my posted question being incomplete!

i'm very sympathetic to this:
> However, your makefile is lying to make; it says that the
> recipe for b1 builds just b1, but in fact it also builds c1
> "behind make's back".
(as, in general, i'd rather be a truth-teller).

i guess for public release, i had better not rely on "&:", until >= 4.3
make(1) become widely distributed.

thanks, by the way, for the fact that (afaict) if i have

b1 c1 &: a1
   <some recipe>
d1: c1
   <some other recipe>

but, in a run, <some recipe> is run, b1 changes, but c1 is *not* changed, then
d1 is *not* remade.

cheers.

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