[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:  new
        Priority:  normal      |               Milestone:
       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:
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Comment (by Rufflewind):

 Replying to [comment:4 thomie]:
 > But escaped single quotes are still ok? That's what was used before
 525856.

 Before 525856, it was invoked like this (contains a double-quote only):

 {{{
 … -e 'config.compiler="$(TEST_HC)"'
 }}}

 Now it's invoked like this (with a double-quote 'and an escaped double-
 quote'):

 {{{
 … -e 'config.compiler="\"$(TEST_HC)\""'
 }}}

 The escaped double-quote is what's tripping up MinGW (an escaped single-
 quote would cause the same problem).

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10449#comment:5>
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