[GHC] #9700: Support C structures in Haskell FFI

[GHC]

#9700: Support C structures in Haskell FFI
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              Reporter:  Yuras       |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.8.3
             Component:  Compiler    |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D252   |
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Comment (by svenpanne):

 Hmmm, I think the wiki page is confusing C types and Haskell types:

    * If one wants to bind to a C structure containing int/char/float/...,
 one has to use CInt/CChar/CFloat/... on the Haskell side.

    * If one wants to access Haskell stuff containing Int/Char/Float, one
 has to use HsInt/HsChar/HsFloat/... on the C side.

 Any kind of structure marshaling can't change anything about that, there's
 no portable correspondence between the types in both worlds.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9700#comment:4>
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