[GHC] #8650: Unexpected behaviour of import ccall "header.h function"

[GHC]

#8650: Unexpected behaviour of import ccall "header.h function"
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        Reporter:  nh2                |            Owner:
            Type:  bug                |           Status:  new
        Priority:  normal             |        Milestone:
       Component:  Compiler           |          Version:  7.6.3
      Resolution:                     |         Keywords:
Operating System:  Unknown/Multiple   |     Architecture:  Unknown/Multiple
 Type of failure:  Documentation bug  |       Difficulty:  Unknown
       Test Case:                     |       Blocked By:
        Blocking:                     |  Related Tickets:
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Comment (by carter):

 so does ghc currently not check if the header file is visible among the
 enumerated include dirs when compiling the ffi binding?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8650#comment:1>
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