[bug #57898] Automatic variable for all targets on grouped target

[Robert Sachunsky]

Follow-up Comment #1, bug #57898 (project make):

*$?* is of course already taken (for the update-triggering prerequisites).

But I would also find it very useful to have an automatic variable for all the
targets in the group.

How about *$%* (archive member name) then? The documentation says it's empty
if the target is not an archive member. So we could add another case here: if
the target is part of a group, the full name of the group.

Or how about another ASCII special character like *$&*?

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