[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        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 It is an attempt to fix this cabal issue:
 https://github.com/haskell/cabal/pull/1455

 Basically, when user fails to list all modules in `exposed-modules` or
 `other-modules`, cabal produces broken package.

 The idea of the fix is to teach GHC to warn about home modules (not from
 an other package), that are not explicitly listed in command line.

 Option name `-Wmissing-home-modules` is a subject for bikeshedding.

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