Re: [Haskell-cafe] Compiling a shared library on MacOS X

There's a patch for it in GHC HEAD by Stephen Blackheath and me, and an accompanying patch for Cabal. http://hackage.haskell.org/trac/ghc/ticket/3550 http://hackage.haskell.org/trac/hackage/ticket/591 has the details. mark On Mon, Jan 4, 2010 at 10:36 AM, Ivan Miljenovic wrote:

If I recall correctly, dynamic linking/shared library support is not yet available for OSX, as the Industrial Haskell Group does not have any knowledge of OSX (but is willing to pay someone who does to do the work).

2010/1/4 Jean-Denis Koeck :

...

Hello, I'm using the following cabal file to build a shared library with ghc:

Build-Type:            Simple Executable libmylibrary.dll   If os(windows)     CPP-Options:        -DWIN32   Extensions:           ForeignFunctionInterface   Build-Depends:        ...   Main-Is:              libmylibrary.hs   Ghc-Options:          -W --make -no-hs-main -optl-shared -optl-s -O2

The resulting library is called from a C++ graphical user interface (using Qt), which worked great so far on Windows and Linux.

However, the compilation fails on MacOS X:

Undefined symbols:   "_ZCMain_main_closure", referenced from:       _ZCMain_main_closure$non_lazy_ptr in libHSrts.a(Main.o)   "___stginit_ZCMain", referenced from:       ___stginit_ZCMain$non_lazy_ptr in libHSrts.a(Main.o) ld: symbol(s) not found collect2: ld returned 1 exit status

I don't know much about shared libraries, even less about them on MacOS X :( Any idea ?

Jean-Denis Koeck

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