[GHC] #12971: Paths are encoded incorrectly when invoking GCC

[GHC]

#12971: Paths are encoded incorrectly when invoking GCC
-------------------------------------+-------------------------------------
        Reporter:  erikprantare      |                Owner:  Phyx
            Type:  bug               |               Status:  patch
        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):  Phab:D2917
       Wiki Page:                    |  Phab:/D2942
-------------------------------------+-------------------------------------
Changes (by Phyx-):

 * differential:  Phab:D2917 => Phab:D2917 Phab:/D2942


Comment:

 Added another possible fix.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12971#comment:11>
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