[GHC] #9626: Test command lines munged on Windows when running on msys Python

[GHC]

#9626: Test command lines munged on Windows when running on msys Python
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       Reporter:  gintas             |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Build System       |                 Version:  7.9
       Keywords:                     |        Operating System:  Windows
   Architecture:  Unknown/Multiple   |         Type of failure:  Building
     Difficulty:  Unknown            |  GHC failed
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:
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 On Windows, the test runner works fine if run under Windows-native Python,
 but fails with the msys Python because of the heuristic transformations
 that msys applies to all binary invocations of non-msys binaries (such as
 timeout.exe) by msys binaries (such as python). This is relatively easy to
 sidestep by going through /usr/bin/cmd in msys which sidesteps the
 argument munging.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9626>
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