Follow-up Comment #4, bug #9060 (project make):
The way make currently works is that MAKEFLAGS is re-parsed only after all the
makefiles have been read in and before make is about to start running recipes.
MAKEFLAGS is not reparsed immediately every time it's changes. This leads to
the behavior you're seeing, since undefined variables used during parsing
won't be flagged.
I don't know if it's so simple to simply have some special code that looks for
setting the MAKEFLAGS variable and does a re-parse every time; I'm not sure
all the flags in MAKEFLAGS are idempotent so parsing them multiple times might
lead to problems. This would need to be checked carefully.
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