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

I'm not sure if it is of any help, but at the haskell-wiki there's an article about how to communicate between Haskell and Objective-C using XCode: http://haskell.org/haskellwiki/Using_Haskell_in_an_Xcode_Cocoa_project -chris On 4 jan 2010, at 00:36, 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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