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Original message from Sven Panne:

HOpenGL did it once again... :-} The NCG for x86
doesn't honour the calling convention for "wrappers":

-- example module ------------------------------------
module CB where

import Foreign.C.Types ( CInt )
import Foreign.Ptr ( FunPtr )

type Callback = CInt -> IO ()

foreign import ccall   "wrapper" makeCallback1 ::
   Callback -> IO (FunPtr Callback)

foreign import stdcall "wrapper" makeCallback2 ::
   Callback -> IO (FunPtr Callback)

-- shell transcript ----------------------------------
$ rm -f *.o ; ghc -c -fffi CB.hs ; nm *.o|grep _CB_d
         U _CB_dS1
         U _CB_dS2    <= !!!!!!!!!! @8 is missing
00000008 T _CB_dS1
00000070 T _CB_dS2@8

$ rm -f *.o ; ghc -c -fffi CB.hs -O ; nm *.o|grep
_CB_d
         U _CB_dUu@8
         U _CB_dUv
00000070 T _CB_dUu@8
------------------------------------------------------

I'd be grateful if this would be be fixed for the next
patchlevel release.

Cheers,
   S.

Trac metadata

Trac field	Value
Version	5.04
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	ResolvedFixed
Component	Compiler (FFI)
Test case
Differential revisions
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Blocking
CC
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Architecture