[Haskell-cafe] Creating DLLs with GHC

[Jason Dagit]

On 9/26/06, Matthew Bromberg <mattcbro at earthlink.net> wrote:
> I am having some difficulty with creating a dynamic link library using
> GHC on windows XP.
>
> I am attempting to follow the example in
> http://www.haskell.org/ghc/docs/6.4/html/users_guide/win32-dlls.html
>
> though I have a binary build of ghc 6.5
>
> My problem (I think) is that some of my Haskell source files link to an
> external C library also contained in a DLL.
>
> I generate my Haskell object files when I compile my Haskell executable.
> I then attempt to use the object files in a ghc compiler statement like
> this,
>
> ghc --mk-dll -o netsim.dll ExternLib.o ExternLib_stub.o dllNet.o src1.o
> src1_stub.o src2.o  -optl-lmatrixstack -optl-L"."
>
> My external C library is in matrixstack.dll and it has a corresponding
> static link stub library matrixstack.lib in the same directory as all
> the sources. It has references in one of the sources (say src1.hs).
>
> Unfortunately I get a host of undefined references to basically all the
> functions in matrixstack.dll and also some undefined references of the form
> Parsefile.o:ghc2996_0.hc:(.text+0x130): undefined reference to
> `TextziParserCombinatorsziParsecziError_show_closure'
> Parsefile.o:ghc2996_0.hc:(.text+0x220): undefined reference to
> `TextziParserCombinatorsziParsecziChar_spaces_closure'
> Parsefile.o:ghc2996_0.hc:(.text+0x24a): undefined reference to
> `TextziParserCombinatorsziParsecziChar_spaces_closure'
> Parsefile.o:ghc2996_0.hc:(.text+0x29c): undefined reference to
> `TextziParserCombinatorsziParsecziChar_spaces_closure'
> ...

If you use cabal I think can follow an example I put on the wiki to
get these undefined references to go away:
http://www.haskell.org/haskellwiki/Cabal

Jason