[GHC] #16047: Incorrect hscTarget in DynFlags when building hs-boot files

[GHC]

#16047: Incorrect hscTarget in DynFlags when building hs-boot files
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           Reporter:  osa1           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.7
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 We don't generate code for hs-boot files, but currently `hscTarget` field
 of `DynFlags` does not reflect that and we see `HscAsm` etc. when building
 boot files. I think we should see `HscNothing` instead.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16047>
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