[GHC] #9121: Presence of dyn_o files not checked upon recompilation

[GHC]

#9121: Presence of dyn_o files not checked upon recompilation
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        Reporter:  andreas.abel      |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Driver            |                 Version:  7.8.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by ezyang):

 Also, easy workaround: delete the offending `.o` file and GHC will
 recompile.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9121#comment:4>
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