[Hackage] #850: Configure fails when an Objective-C .h file is specified

Hackage cvs-ghc at haskell.org
Fri May 27 20:36:10 CEST 2011

#850: Configure fails when an Objective-C .h file is specified
  Reporter:  dankna         |        Owner:                           
      Type:  defect         |       Status:  new                      
  Priority:  normal         |    Milestone:                           
 Component:  Cabal library  |      Version:  HEAD                     
  Severity:  normal         |     Keywords:  configure mac objective-c
Difficulty:  unknown        |   Ghcversion:                           
  Platform:                 |  

Comment(by dankna):

 It occurs to me trying to solve this that it's actually a hard problem.
 Passing the -x <language> flag to gcc is the easy part, but in the general
 case the header file could be C, ObjC, C++, or even ObjC++.  There's no
 way for Cabal to infer which it is, since it has the same extension, .h,
 in all four cases.

 I see two approaches.  One would be to have the package author pass the
 information in the .cabal file somehow.  The drawback is that it's not
 really clear what a good interface would be.  The other would be to try to
 autodetect it after all somehow, perhaps by getting gcc to spit out
 dependency information to see what source files (which /can/ have their
 languages inferred by their filenames) includes what header files.

Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/850#comment:1>
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