[GHC] #15072: Teach the testsuite driver about response files

[GHC]

#15072: Teach the testsuite driver about response files
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           Reporter:  bgamari        |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.2.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Currently `T14697` is disabled on Windows as that test produces a long
 enough command-line (mostly `-D` flags) that it runs amok of the Windows
 command-line length limit.

 It seems like the solution here will be to teach the testsuite driver to
 invoke GHC with a response file.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15072>
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