Follow-up Comment #3, bug #63439 (project make):
It's true that the same issue exists for this, but in this case it's not a
regression. It also warned in previous releases:
~$ make --version
GNU Make 4.3
~$ echo 'all:;echo $(GNUMAKEFLAGS)' | make -f- --warn-undefined-variables
echo
~$ echo 'all:;echo $(MAKECMDGOALS)' | make -f- --warn-undefined-variables
/tmp/GmXydHev:1: warning: undefined variable 'MAKECMDGOALS'
echo
I think we're going to need a more generic way to disable warnings for certain
variables that should not be warned about if they're not set.
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