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

[Mark Wotton]

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
<ivan.miljenovic at gmail.com> 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 <jdkoeck at gmail.com>:
>> 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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>>
>
>
>
> --
> Ivan Lazar Miljenovic
> Ivan.Miljenovic at gmail.com
> IvanMiljenovic.wordpress.com
> Joan Crawford  - "I, Joan Crawford, I believe in the dollar.
> Everything I earn, I spend." -
> http://www.brainyquote.com/quotes/authors/j/joan_crawford.html
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