Tom Hawkins wrote:
I have a chunk of Haskell code I would like wrap up and distribute as a library. Is there a way to build a static library (*.a) that includes my code plus the Haskell runtime, which C programs can easily link against? Here is what I have tried so far...
ghc --make -fffi MyLib # Builds MyLib.o and MyLib_stub.o. gcc -c -I/usr/local/lib/ghc-6.4.1/include MyLibWrapper.c ar -r libMyLib.a MyLib.o MyLib_stub.o MyLibWrapper.o
This works fine when I use ghc to compile and link a C program...
ghc main.c libMyLib.a
But if I use gcc, it throws a lot of unresolved references. I have no problem compiling with ghc, but the folks using my library probably won't have it installed.
I added -v to ghc to see how it calls gcc; it seems to link in different libraries based on what Haskell libraries are being used, and it undefines a bunch is symbol references. Are there any switches to have ghc return a single archive with everything included?
No switches, I'm afraid. You'll need to include the complete contents of libHSrts.a, and whatever packages you're using: probably at least base and haskell98, i.e. libHSbase.a and libHShasekll98.a respectively. I don't know if you can include the contents of a .a file directly when building another .a file, if not you'll need to unpack these archives and include their contents when building your archive. Cheers, Simon