[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:
            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 bgamari):

 `ghc -v` reveals that the failing command is,
 {{{
 Linking Hello.exe ...
 *** C Compiler:
 "C:\msys64\home\ben\ghc-8.0.1-i386\lib/../mingw/bin/gcc.exe" "-U__i686"
 "-march=i686" "-fno-stack-protector" "-DTABLES_NEXT_TO_CODE" "-c"
 "C:\msys64\home\ben\Prntare\ghc4688_0\ghc_4.c" "-o"
 "C:\msys64\home\ben\Prntare\ghc4688_0\ghc_5.o"
 "-IC:\msys64\home\ben\ghc-8.0.1-i386\lib/include"
 realgcc.exe: error: C:\msys64\home\ben\Präntare\ghc4688_0\ghc_4.c: No such
 file or directory
 realgcc.exe: fatal error: no input files
 compilation terminated.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12971#comment:4>
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