[GHC] #3971: ghc-pkg list segfaults in ghc-6.12.1.20100330

[GHC]

#3971: ghc-pkg list segfaults in ghc-6.12.1.20100330
---------------------------+------------------------------------------------
    Reporter:  wkahl       |       Owner:                
        Type:  bug         |      Status:  new           
    Priority:  normal      |   Component:  Package system
     Version:  6.12.1 RC1  |    Keywords:                
          Os:  Linux       |    Testcase:                
Architecture:  powerpc     |     Failure:  None/Unknown  
---------------------------+------------------------------------------------

Comment(by wkahl):

 The
 [http://www.haskell.org/haskellwiki/GHC/Using_the_FFI#Callbacks_into_Haskell_from_foreign_code
 CallBacker] example segfaults, too, both with GHC-6.10.4 and
 GHC-6.12.1.20100330.

 I then changed main slightly:
 {{{
 main :: IO ()
 main = do
   squareW <- wrap square     -- make function pointer from the function
   putStrLn "got squareW"
   let x = 4
   y <- twice squareW x       -- use the foreign function with our callback
   print y                    -- see that it worked
   z <- twice squareW y
   print z
   freeHaskellFunPtr squareW  -- clean up after ourselves
 }}}
 Running this produces:
 {{{
  ./CallBacker
 got squareW
 Segmentation fault
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3971#comment:9>
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