Re: [Haskell-cafe] Undefined symbol error coming from shared, dynamic library.

Hi, Captain ! I got haskell shared libraries with following cabal command: cabal install --global --reinstall --disable-library-profiling --enable-shared --ghc-option=-dynamic mtl and so on. It allowed me to get haskell libraries and I could compile my own shared libraries. And ldd helps me to know which libraries need me to use them on users computers with my library. I believe this cabal options can set in ~/.cabal/config or somethisg like this. In my case I merely create shell script and call it cabal-shared.sh. :) There is my options to compile my library: ghc -O2 --make -no-hs-main -dynamic -shared -fPIC -optl '-shared' -optc '-DMODULE=MyLibModule' -o MyLibModule.so MyLibModule.hs module_init.c -optl-Wl -lHSrts-ghc7.0.2 where module_init.c has contents: #define CAT(a,b) XCAT(a,b) #define XCAT(a,b) a ## b #define STR(a) XSTR(a) #define XSTR(a) #a #include extern void CAT (__stginit_, MODULE) (void); static void library_init (void) __attribute__ ((constructor)); static void library_init (void) { /* This seems to be a no-op, but it makes the GHCRTS envvar work. */ static char *argv[] = { STR (MODULE) ".so", 0 }, **argv_ = argv; static int argc = 1; hs_init (&argc, &argv_); hs_add_root (CAT (__stginit_, MODULE)); } static void library_exit (void) __attribute__ ((destructor)); static void library_exit (void) { hs_exit (); } Cheers, Sergiy