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

[GHC]

#12971: Paths are encoded incorrectly when invoking GCC
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        Reporter:  erikprantare  |                Owner:  Phyx
            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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Comment (by Ben Gamari <ben@…>):

 In [changeset:"8f0546bfaf47ec865bb0c6dc2cb0ac451367f65a/ghc"
 8f0546bf/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="8f0546bfaf47ec865bb0c6dc2cb0ac451367f65a"
 testsuite: Add test for #12971

 Test Plan: Validate

 Reviewers: austin

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2855

 GHC Trac Issues: #12971
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12971#comment:8>
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