[GHC] #9351: add ability to version symbols .c for packages with C code

[GHC]

#9351: add ability to version symbols .c for packages with C code
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              Reporter:  slyfox      |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.8.3
             Component:  Compiler    |         Keywords:  backpack
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by hvr):

 Fwiw, I'd rather have a macro for the `.hs` part as well than have yet
 another FFI calling convention. (it'd be useful in other cases as well, to
 have the ability to uniformly transform the ABI-level C symbol name; e.g.
 for GMP, all official function names are prefixed by `__g` prefix at the
 ABI level)

 E.g. something like:

 {{{#!hs
 foreign import ccall C_PKG_NAME("a.h","get_something") :: IO Int
 }}}

 This will, however, require a better CPP than the current traditional CPP
 mode to work...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9351#comment:1>
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