1. Is it possible to treat warnings as errors in a Makfile (and thus exit before Makefile proceeds)

  2. Furthermore, is it possible to filter out which warning yields an error?

My use case: I want to use --warn-undefined-variables in combination with this so that Makefile will exit when a variable is undefined, which is a very common source of error. Obviously I don't want to manually check for each variable as this is error-prone/tedious. I couldn't find anything on this, but it's a pretty important/basic feature.

Note: I'm not looking for -Werror which is a gcc specific command not applicable to my use case.

makefile warnings undefined build-error
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