There was (two days ago or so) a sequence of posts about this. You need the command line option -ffi.
-- Hal Daume III "Computer science is no more about computers | [EMAIL PROTECTED] than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume On Tue, 22 Oct 2002, Francis Girard wrote: > Hello, > > I'm a beginner trying to use FFI. I copied the example given in : > > The Glasgow Haskell Compiler User's Guide, Version 5.04 > Chapter 8. Foreign function interface (FFI) > > -------------------------------------------------------------------------- > module Foo where > > foreign export ccall foo :: Int -> IO Int > > foo :: Int -> IO Int > foo n = return (length (f n)) > > f :: Int -> [Int] > f 0 = [] > f n = n:(f (n-1)) > -------------------------------------------------------------------------- > > Copied it verbatim. And simply tried to compile it using "ghc -c Foo.hs -o > Foo.o" and always got the error : > > Type signature given for an expression (at the line following the "foreign > export") > > I then tried to import the "Foreign" and "Foreign.C" modules but it didn't > change anything. > > I am missing something and I would be VERY grateful to anyone that tells me > what. > > Thank you > > Francis Girard > Le Conquet (France) > [EMAIL PROTECTED] > _______________________________________________ > Glasgow-haskell-users mailing list > [EMAIL PROTECTED] > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > _______________________________________________ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users