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

[GHC]

#12971: Paths are encoded incorrectly when invoking GCC
---------------------------------+----------------------------------------
        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:                |
---------------------------------+----------------------------------------

Comment (by bgamari):

 Indeed I can reproduce this with,
 {{{
 $ mkdir Präntare
 $ export TMP=`pwd`/Präntare
 $ echo 'main = putStrLn "hello world!"' > Hello.hs
 $ ghc Hello.hs
 1 of 1] Compiling Main             ( Hello.hs, Hello.o )
 Linking Hello.exe ...
 realgcc.exe: error: C:\msys64\home\ben\Präntare\ghc2596_0\ghc_4.c: No such
 file or directory
 realgcc.exe: fatal error: no input files
 compilation terminated.
 `gcc.exe' failed in phase `C Compiler'. (Exit code: 1)

 $ export TMP=/tmp
 $ ghc Hello.hs
 Linking Hello.exe ...
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12971#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler