GHCi can't see 'atexit', can't load module

[Maurí­cio CA]

(I left this in cafe, but I think it is actually ghc related.)

I just checked it seems not to be possible to load any module in
GHCi that uses FFI to wrap the standard C function 'atexit'. When
trying that, we get a message saying the symbol 'atexit' can't be
found. (This is not a problem when building an executable with
ghc, though.)

It's easy to reproduce the problem. Just try something like this:

-----
module XXX where
import Foreign
import Foreign.C
foreign import ccall atexit :: FunPtr (IO ()) -> IO CInt
-----

Load it in ghci (after ':set -XForeignFunctionInterface' to get
FFI) and you will get the error. If we replace the line below for
the above we don't get any error message:

foreign import ccall exit :: CInt -> IO ()

Here, we just replaced 'atexit' by 'exit', which, according to
'nm' tool, is at the same 'libc' library that 'atexit' belongs to.

Thanks,
Maurício