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

[GHC]

#8683: add "cpp program" and "cpp program options" to settings file
-------------------------------------+------------------------------------
        Reporter:  carter            |            Owner:
            Type:  feature request   |           Status:  patch
        Priority:  high              |        Milestone:  7.8.2
       Component:  Compiler          |          Version:  7.8.1-rc2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #8439
-------------------------------------+------------------------------------

Comment (by carter):

 sounds good to me. Especially since the patch is more future proofing than
 "needed today".  Malcom's remark on  devs
 {{{

 This looks like the key information:

 > Building xhtml-3000.2.1...
 > Preprocessing library xhtml-3000.2.1...
 > ghc: could not execute:

 Ghc is reporting that it could not execute "".  This suggests the
 commandline for external preprocessing is incorrectly formed.
 }}}

 is suggestive. I may have to revisit herbert's patch perhaps.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8683#comment:56>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler