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Compiling a shared library on MacOS X

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Jean-Denis Koeck

3 Jan 2010 3 Jan '10

9:28 a.m.

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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Jean-Denis Koeck

3 Jan 3 Jan

11:33 a.m.

According to the manual, I have to use the -shared flag to compile a library. But I get the following error: link: GHC not built to link this way: LinkDynLib Guess I have to recompile ghc ! 2010/1/3 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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Brandon S. Allbery KF8NH

6:08 p.m.

On Jan 3, 2010, at 09:28 , Jean-Denis Koeck wrote:

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

I don't know if any released GHC knows how to do that yet. In any case it's still experimental. -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH

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Ivan Miljenovic

6:36 p.m.

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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-- Ivan Lazar Miljenovic Ivan.Miljenovic@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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Chris Eidhof

4 Jan 4 Jan

7:20 p.m.

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

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@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 _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

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Mark Wotton

7:38 p.m.

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

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@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 _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

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participants (5)

Brandon S. Allbery KF8NH
Chris Eidhof
Ivan Miljenovic
Jean-Denis Koeck
Mark Wotton