[GHC] #8736: GHCi doesn't load .dyn_o files appropriately

[GHC]

#8736: GHCi doesn't load .dyn_o files appropriately
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        Reporter:  thoughtpolice     |                Owner:  thoughtpolice
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.1
       Component:  GHCi              |              Version:  7.8.1-rc2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9282             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by duncan):

 I should point out (as in my dupe ticket #11118) that this causes `cabal
 repl` to never be able to load .o files for modules previously compiled,
 and that there is no sensible workaround that `cabal` can use. The only
 way to make it work, afaics, is to call ghc to build things twice, once
 for `-static` and once for `-dynamic` outputs. We don't want to do this
 since it'll almost double compile times compared to using `-dynamic-too`.

 So this is perhaps more important than spj realised (in #comment:4).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8736#comment:18>
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