The description of the -M option looks like this:

-M Generate dependency information suitable for use in a Makefile.
(copied from 
http://www.haskell.org/ghc/docs/latest/html/users_guide/flag-reference.html#id3152912)

It should contain the hint that it writes this information to a Makefile.
I'm thinking of something like
-M writes dependency information suitable for use in a Makefile into the 
Makefile

Is it worth filing a bug report?

Marc
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