[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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Comment (by trommler):

 Replying to [comment:20 trommler]:
 > Replying to [comment:16 carter]:
 > OK, I see what the issue is:
 > > here an error from
 > > ./configure --with-gcc=clang --with-cpp=gcc
 > >
 > > (where i try to add the cpp flags to mk/config.in with a patch i've
 not pushed yet)
 > >
 > > [...]
 > > with the associated log  being
 > >
 > > {{{
 > > This file contains any messages produced by compilers while
 > > running configure, to aid debugging if configure makes a mistake.
 > >
 > > It was created by Haskell terminfo package configure 0.2, which was
 > > generated by GNU Autoconf 2.69.  Invocation command line was
 > >
 > >   $ ./configure --with-compiler=ghc CFLAGS= -m64 -fno-stack-protector
 LDFLAGS= -m64   CPPFLAGS= -m64 -E -undef -traditional    --with-cc=gcc
 --with-gcc=/Users/carter/bin/gcc
 > >
 > > [...]
 > > configure:2413: checking whether the C compiler works
 > > configure:2435: gcc  -m64 -fno-stack-protector     -m64 -E -undef
 -traditional     -m64   conftest.c  >&5
 > >[...]
 > > }}}
 Wait a minute! Why are those flags passed to the C compiler at all. I
 thought they were meant to be used by ghc to preprocess Haskell files?!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8683#comment:21>
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