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copied!<p>The canonical way of is this:</p> <ol> <li>Export the functions (via FFI) to initialise RTS (runtime system) by the foreign program</li> <li>Export actual functions you would like to implement in Haskell</li> </ol> <p>The following sections of manual describe this: <a href="http://www.haskell.org/ghc/docs/7.0-latest/html/users_guide/ffi-ghc.html#ffi-library" rel="nofollow">[1]</a> <a href="http://www.haskell.org/ghc/docs/7.0-latest/html/users_guide/using-shared-libs.html#id471899" rel="nofollow">[2]</a></p> <p>On the other way, you can try technique described in this blog post (which mine, by the way):</p> <p><a href="http://mostlycode.wordpress.com/2010/01/03/shared-haskell-so-library-with-ghc-6-10-4-and-cabal/" rel="nofollow">http://mostlycode.wordpress.com/2010/01/03/shared-haskell-so-library-with-ghc-6-10-4-and-cabal/</a></p> <p>It boils down to creating a small C file which is called automatically right after a library is loaded. It should be linked together into the library.</p> <pre><code>#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 (); } </code></pre> <p>Edit: Original blog post describing this technique is this: <a href="http://weblog.haskell.cz/pivnik/building-a-shared-library-in-haskell/" rel="nofollow">http://weblog.haskell.cz/pivnik/building-a-shared-library-in-haskell/</a></p>

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