[GHC] #12971: Paths are encoded incorrectly when invoking GCC (was: Change default tmpdir)

[GHC]

#12971: Paths are encoded incorrectly when invoking GCC
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        Reporter:  erikprantare  |                Owner:
            Type:  bug           |               Status:  new
        Priority:  highest       |            Milestone:  8.2.1
       Component:  Compiler      |              Version:  8.0.1
      Resolution:                |             Keywords:
Operating System:  Windows       |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Changes (by bgamari):

 * priority:  normal => highest
 * os:  Unknown/Multiple => Windows
 * type:  feature request => bug
 * milestone:   => 8.2.1


Comment:

 Oh dear, it looks like we are failing to encode a filename with UTF-16 as
 expected by Windows.

 This is quite

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12971#comment:2>
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