[GHC] #13899: Improve [-Wmissing-home-modules] error message

[GHC]

#13899: Improve [-Wmissing-home-modules] error message
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           Reporter:  alanz          |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.2.1
          Component:  Compiler       |           Version:  8.2.1-rc2
           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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 At the moment when this warning is triggered, GHC emits something like

 {{{#!hs
 <no location info>: warning: [-Wmissing-home-modules]
     Modules are not listed in command line:
 Language.Haskell.GHC.ExactPrint
 }}}

 It is not clear that this is actually reporting a problem in the cabal
 file which has incomplete "other-modules" for one or other target.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13899>
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