[GHC] #3389: CPP strips out C-style comments

[GHC]

#3389: CPP strips out C-style comments
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        Reporter:  nominolo          |            Owner:  igloo
            Type:  feature request   |           Status:  closed
        Priority:  normal            |        Milestone:  7.0.1
       Component:  Driver            |          Version:  6.10.2
      Resolution:  wontfix           |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:  T3389             |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 I can confirm `int-e`s finding here. Should we just add `-ffreestanding`
 to the test case?

 I don’t find any other use or documentation of `-optP -C` in ghc or the
 testsuite.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3389#comment:11>
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