[sr #106268] Please implement -M option for M4!

[Eric Blake]

Update of sr #106268 (project m4):

                  Status:                    None => Confirmed              

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Follow-up Comment #1:

Hmm.  git head already provides -M to mean --module-directory, which has
nothing to do with dependency tracking, so we would have to use a different
letter (or if Gary's idea of simplifying modules pans out, free it up for a
better use).  However, the idea of dependency tracking is reasonable, and in
fact is already in the TODO from several years ago:

  + Make m4 show include dependencies like gcc so Makefile targets are
    updated when their (included) input files are updated (Erick B).

All we need is a volunteer with enough time and desire to implement it.


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