Hi, I've been trying to get FFI to just do something, anything, for the past few weeks and have not been able to do anything. I've looked around for documentation and have read the ghc's documention page for ffi several times and nothing works. Main problem, I think, is that I am not sure how I should compile the *.hs and *.c files. If someone could post an example of a "hs" and a "c" file and how to compile it with ghc, i would be very apreciative. I have looked at http://www.haskell.org/ghc/docs/latest/html/users_guide/sec-ffi-ghc.html for a long time, and I can't figure out how to reproduce the example. I have noticed that if you name your hs file "M.hs" as the page says, then ghc will produce M_stub.h instead of the included "foo_stub.h" that the c main program lists. I've used windowsXP and ghc[rpm] installed on redhat7.3, and still nothing works. my best linux output... [Jacob@localhost ffi]$ ls main.c M.hs [Jacob@localhost ffi]$ ghc -fglasgow-exts M.hs /usr/lib/ghc-5.04/libHSrts.a(Main.o): In function `main': Main.o(.text+0x4): undefined reference to `__stginit_Main' Main.o(.text+0x1b): undefined reference to `Main_zdmain_closure' collect2: ld returned 1 exit status [Jacob@localhost ffi]$ ghc -fglasgow-exts main.c M_stub.c In file included from main.c:4: /usr/lib/ghc-5.04/include/RtsAPI.h:125: syntax error before `const' /usr/lib/ghc-5.04/include/RtsAPI.h:126: syntax error before `const' main.c: In function `main': main.c:12: `__stginit_foo' undeclared (first use in this function) main.c:12: (Each undeclared identifier is reported only once main.c:12: for each function it appears in.) main.c: At top level: /usr/lib/ghc-5.04/include/RtsAPI.h:125: storage size of `GHCziTopHandler_runIO_closure' isn't known /usr/lib/ghc-5.04/include/RtsAPI.h:126: storage size of `GHCziTopHandler_runNonIO_closure' isn't known [Jacob@localhost ffi]$ ls Foo.hi main.c M.hs M.o M_stub.c M_stub.h M_stub.o [Jacob@localhost ffi]$ Not sure if this is the apropriate mailinglists, but I have looked in most of the others, and FFI is rarely discussed. Thank you for listening, Jacob Colvin _________________________________________________________________ Join the worlds largest e-mail service with MSN Hotmail. http://www.hotmail.com