Follow-up Comment #1, bug #64115 (project make):
make warns about undefined variable GNUMAKEFLAGS when -R is specified.
$ echo 'all:' | make -f - -R --warn-undefined-variables
make: warning: reference to undefined variable 'GNUMAKEFLAGS'
make: Nothing to be done for 'all'.
$
This patch adds GNUMAKEFLAGS to defined_vars.
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