[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
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 Yes, I can't use `hscTarget` reliably in my code but it's sometimes
 incorrect.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16047#comment:2>
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