RE: [bug #13976] Regression in :: deps handling between V3.76 and V3.80

[Paul D. Smith]

  > From: Paul Smith [mailto:address@hidden On Behalf Of Paul D. Smith

  >> all: foo .WAIT bar
  >> 
  >> foo: baz biz
  >> bar: boz booz

  >> would be that neither foo NOR any of its prerequisites would 
  >> be built until bar and all if its prerequisites were finished.

%% address@hidden writes:

  rm> Didn't you get that backwards?

  rm> Shouldn't it be that bar and its prerequistes are built after foo and
  rm> all its prerequisites?

Oh right.  So I had the other examples of order-only wrong too; it would
be:

    all: foo bar
    bar: | foo

But in order to get the full functionality you'd need:

    all: foo bar

    foo: baz biz
    bar: boz booz

    bar boz booz: | foo

And on and on for any prerequisites of bar, boz, and booz, etc.  Ouch.
This is more powerful than the proposed .WAIT in one way, though: since
it actually creates target prerequisites it isn't impacted by targets
being built through a different branch of the dependency graph.

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