[GHC] #13129: Warn about home module, not listed in commang line

[GHC]

#13129: Warn about home module, not listed in commang line
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        Reporter:  Yuras             |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  phab:D2977
       Wiki Page:                    |
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Comment (by dfeuer):

 The referenced issue is a closed Cabal pull request. Can you try to
 explain exactly what the problem is, and why special GHC support is needed
 to solve it?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13129#comment:2>
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