[bug #60077] Deterministic $@ for grouped targets patch

[Todd Lowe]

Follow-up Comment #2, bug #60077 (project make):

I admit I wasn't too thrilled about making $@ behave differently between
explicit and pattern rules, but I definitely did not want to change the long
standing pattern rule behaviour and didn't find the grouped-target $@ useful. 
I had proposed $! for instigating target, but I can see that the inconsistency
in that would be worse than the solution.

I'm not sure why I didn't like the idea of $(firstword $&), but likely because
I was too focused on $@ not behaving the way it did with my pseudo
grouped-targets by macro :-) 

I had not thought about $(@^) and $(@<), but I like the consistency they have
with the existing variables. 

I wrote my patch last fall and other priorities have delayed our move to 4.3.
If I get back to it before someone else, I will implement these and provide a
new patch.


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