Follow-up Comment #1, bug #60165 (project make):
The attached patch (if I understand it correctly) will break the large
majority of makefiles that use pattern rules today, including even some
built-in rules in GNU make. It's clearly a non-starter from a
backward-compatibility standpoint.
We implemented "&:" for explicit rules, to allow them to declare grouped
targets: multiple targets generated by a single invocation of the recipe (this
is how pattern rules ":") work.
We need to finish this by allowing a single definition of a pattern rule to
create "exploded" rules: multiple pattern rules (the way explicit rules with
":" work). But as above, we definitely can't do that by just changing the way
pattern rules with ":" work.
Back when "&:" was suggested I had proposed using "|:" as a separator that
means that one rule is created for each target. That is, if you use "&:"
(with any type of rule) you get grouped behavior. If you use "|:" (with any
type of rule) you get exploded behavior. And if you use ":" without a
specifier you get the "historical" behavior (exploded with explicit rules and
grouped with pattern rules).
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