[GHC] #9457: hsc2hs breaks with `--cflag=-Werror` in cross-compilation mode

[GHC]

#9457: hsc2hs breaks with `--cflag=-Werror` in cross-compilation mode
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        Reporter:  rwbarton          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  hsc2hs            |                 Version:  7.9
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #10237            |                Blocking:
                                     |  Differential Revisions:
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Comment (by erikd):

 I think what `hsc2hs` needs is a test suite that is always compiled with
 `-Werror` switched on.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9457#comment:2>
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