[bug #54854] multi-target rules invoked too often with -j2

[Paul D. Smith]

Follow-up Comment #7, bug #54854 (group make):

If you can rely on having GNU Make 4.3 or better, you can use grouped explicit
targets to get the same behavior make provides to pattern rules, with explicit
rules:

https://www.gnu.org/software/make/manual/html_node/Multiple-Targets.html

If you must support versions of GNU Make prior to 4.3 (released in 2020) then
you will have to use alternate methods.


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