[GHC] #9760: ghc -c 7.8 drops last char of file name if -osuf contains a dot

[GHC]

#9760: ghc -c 7.8 drops last char of file name if -osuf contains a dot
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       Reporter:  nh2                |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:  7.8.4
      Component:  Build System       |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Moderate (less     |         Type of failure:
  than a day)                        |  None/Unknown
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:
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 I discovered that if I compile with `ghc -c -osuf .something Myfile.hs`
 where `Myfile.hs` contains TH and thus has to dynamically link in, say,
 `Other.hs`, I get the error that


 {{{
 Myfile.hs:1:1:
     cannot find normal object file 'Othe.dyn_o`
     while linking an interpreted expression
 }}}

 So `Other` was wrongly made into `Othe`, dropping the last character.

 If I don't pass `-osuf .something`, or have it not have a dot,
 everything's fine.

 The trouble is that `-osuf .something` worked fine in GHC <= 7.6.

 So I believe this is a regression, or at least a very bad error message.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9760>
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