[bug #63686] implement a flag to promote make warnings to fatal errors

[David Boyce]

Follow-up Comment #4, bug #63686 (project make):

I cannot think of an objection to prefer a special target as of current state.
At one time manipulating MAKEFLAGS internally was dicey but I gather that as
of 4.4.1 it's safe. If so, it appears that the methodologies of "special
target with potential --eval option" and "command-line option with potential
embedded MAKEFLAGS setting" have converged. Both would allow what I want,
which is for either the user or the makefile to impose its policy (with the
user winning any disagreements).


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