Re: [Haskell-cafe] FFI link failing due to no main?

Thanks for the reply! I think this might be a Mac OS X issue. I've stripped my rather longwinded example down to the simplest case (one Haskell source file to create a single shared library containing a single exported function) and this compiles (and ultimately runs) fine on Linux. So I'm either doing something wrong which shouldn't really work on Linux (and I'm getting lucky!)... or something screwy is happening on Mac version: This exports a single function which is then #included in CInterface.c to create a new pure-C wrapper to the function. ghc -O2 -c HaskellFuncs.hs ghc -O2 -no-hs-main --make -optl '-shared' CInterface.c HaskellFuncs_stub.o HaskellFuncs.o -o libCInterface.so One Mac OS X I get the following error - but it works fine on Ubuntu. I'm using 6.10.4 on both machines: Linking libCInterface.so ... 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 Could anyone comment if I'm doing anything wrong, or is this a case of unsupported functionality on (PPC/Leopard) Mac OS X? Has anyone succeeded in getting a similar example to work on Mac OS X? I notice on Linux it is still very temperamental, if I play around with the arguments even slightly I get the same error there. Cheers, Phil. On 26 Aug 2009, at 06:51, Yusaku Hashimoto wrote:

Missing -c option?

And -v option to see what's going on.

On Wed, Aug 26, 2009 at 10:37 AM, wrote:

...

Hi,

After creating my stub objects etc using GHC, I'm trying to create a library with a C interface to some Haskell functions. I'm explicitly passing in -no-hs-main yet the linker still fails due to missing main?

I'm sure I've had this working before with a slightly simpler example, but can't work out what is wrong here.

If I give it a main (to humor it - it's not a solution), then it links and produces an executable - so it looks to me like I'm not telling the linker what I want correctly?

Any ideas?

Cheers,

Phil.

ghc -O2 --make -no-hs-main -package mtl -package array -optl '- shared' FFI/Octave/MyInterface.c FFI/Octave/OptionInterface_stub.o FFI/Octave/OptionInterface.o ./FrameworkInterface.o ./Maths/Prime.o ./MonteCarlo/DataStructures.o ./MonteCarlo/European.o ./MonteCarlo/Framework.o ./MonteCarlo/Interface.o ./MonteCarlo/ Lookback.o ./Normal/Acklam.o ./Normal/BoxMuller.o ./Normal/Framework.o ./Normal/Interface.o ./Random/Framework.o ./Random/Halton.o ./Random/Interface.o ./Random/Ranq1.o -o FFI/Octave/ libMyInterface.so Linking FFI/Octave/libMyInterface.so ... Undefined symbols: "___stginit_ZCMain", referenced from: ___stginit_ZCMain$non_lazy_ptr in libHSrts.a(Main.o) "_ZCMain_main_closure", referenced from: _ZCMain_main_closure$non_lazy_ptr in libHSrts.a(Main.o) ld: symbol(s) not found collect2: ld returned 1 exit status

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