[GHC] #8683: add "cpp program" and "cpp program options" to settings file

[GHC]

#8683: add "cpp program" and "cpp program options" to settings file
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        Reporter:  carter            |            Owner:
            Type:  feature request   |           Status:  patch
        Priority:  normal            |        Milestone:  7.8.1
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #8439
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Changes (by carter):

 * status:  new => patch


Comment:

 ok, the configure setup pieces now work! (thanks peter!)

 one last thing that peter has suggested, and I agree with, is that we
 should add that using  --with-cpp=foo then requires you to specify a
 --with-cpp-flags=blah (because theres no general way to determine the
 right flags, so they must be user supplied if you're specifying your own
 cpp)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8683#comment:10>
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