[GHC] #9176: GHC not generating dyn_hi files

[GHC]

#9176: GHC not generating dyn_hi files
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        Reporter:  heatsink  |            Owner:
            Type:  bug       |           Status:  new
        Priority:  normal    |        Milestone:
       Component:  Compiler  |          Version:  7.9
      Resolution:            |         Keywords:  dynamic
Operating System:  MacOS X   |     Architecture:  x86_64 (amd64)
 Type of failure:  Other     |       Difficulty:  Unknown
       Test Case:            |       Blocked By:
        Blocking:            |  Related Tickets:
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Comment (by heatsink):

 The dyn_hi file goes missing because GHC detects a bad module interface
 hash and disables dynamic-too.  It's disabled in `findAndReadIface` by
 assigning False to `canGenerateDynamicToo`.  That flag stops
 `hscWriteIface` from writing a dyn_hi file.

 GHC will print diagnostic messages if it's run with `-ddump-if-trace`, so
 you can see this happening.

 IMO, this condition should be an error because GHC does not generate the
 file it was told to generate.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9176#comment:3>
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