[GHC] #7478: setSessionDynFlags does not always work

[GHC]

#7478: setSessionDynFlags does not always work
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        Reporter:  edsko             |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:  7.8.1
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:  ghc-api/T7478     |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonmar):

 I expect there's a mismatch between modules compiled with `-dynamic` and
 without, or something like that.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7478#comment:9>
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