Simon Marlow wrote:
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
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Just to revisit this topic for a second. I have also attempted to create static link libraries in linux that can be linked outside of ghc and have unfortunately failed. One of the problems is that it is not easily determined which libraries contain a given unreferenced symbol, moreover trying to link against all the libraries or all the object code invariably runs into errors. For example libHSrts.o contains main which conflicts with an external main (in say C). When I attempt to find a minimal set of libraries to include I invariably run into hundres of unresolved references such as undefined reference to `stg_ap_p_fast' libPowCDF.a(Parsefile.o): In function `r1IF_info': or libPowCDF.a(HSrts.o): In function `addDLL': (.text+0xb318): undefined reference to `dlopen' but there are typically hundreds of such unresolved references. What I'd really like is something like the --mk-dll option for ghc under windows to make a stand-alone library in linux, either static or dynamic. Otherwise to export Haskell code to the rest of the world requires that the linking be performed with ghc. For a complex project that relies heavily on a given set of compiler tools, this may be impossible. -- View this message in context: http://www.nabble.com/Creating-static-libraries-using-GHC-tf941394.html#a952... Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.