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

[Paul D. Smith]

Update of bug #63686 (project make):

           Fixed Release:                    None => SCM                    

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Follow-up Comment #3:

I have implemented a comprehensive method of controlling warnings in general,
including setting the action to take to "ignore", "warn", or "error", and also
added a few new warnings, which should be available in the next major
(non-bugfix) release (this is not committed yet it's in my local repo).

I implemented it as a flag "--warn..." not as a special target.  Of course you
can always use "MAKEFLAGS += --warn..." in your makefile.

If there are reasons to want a special target please let me know.


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