[GHC] #10449: Out-of-tree tests broken on MinGW + native Python due to quoting of config.compiler

[GHC]

#10449: Out-of-tree tests broken on MinGW + native Python due to quoting of
config.compiler
-------------------------------+-------------------------------------------
        Reporter:  Rufflewind  |                   Owner:
            Type:  bug         |                  Status:  patch
        Priority:  normal      |               Milestone:  7.12.1
       Component:  Test Suite  |                 Version:  7.10.1
      Resolution:              |                Keywords:
Operating System:  Windows     |            Architecture:  Unknown/Multiple
 Type of failure:  Other       |               Test Case:
      Blocked By:              |                Blocking:
 Related Tickets:  #10441      |  Differential Revisions:  Phab:D911
-------------------------------+-------------------------------------------

Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"ce166a3aaab28a9b08c60da6d0cfdab998b6e8ca/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ce166a3aaab28a9b08c60da6d0cfdab998b6e8ca"
 Testdriver: do not interfer with MinGW path magic (#10449)

 This should fix the testsuite driver on Windows using the MinGW tools
 with a native build of Python.

 MinGW automagically converts MinGW-style paths (e.g.
 '/c/programs/ghc/bin/ghc') into ordinary Windows paths (e.g.
 'C:/programs/ghc/bin/ghc') when a native Windows program is invoked. But
 it doesn't do so when those paths are wrapped with a pair of escaped
 double quotes.

 The fix is to not call `eval` on the paths in Python, which let's us use
 one less pair of quotes, and makes MinGW happy.

 Reviewers: Rufflewind, austin

 Differential Revision: https://phabricator.haskell.org/D911
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10449#comment:10>
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