Re: [Haskell-cafe] Building SDL-image package on Windows

I think the best thing to do is to darcs send a patch with the necessary changes On Thu, Aug 28, 2008 at 1:05 AM, Garrick Chin wrote:

Hello,

Adding the main macro undef has solved the linker errors and both SDL_image and SDL_ttf build and install correctly now. For both SDL_image and SDL_ttf only the ./Graphics/UI/SDL/Image/Version.hsc file needed to be changed, pasting in the undef macro under "#include SDL_image.h" and "#include SDL_ttf.h" respectively. Thanks for your help!

It would probably be a good idea to include these notes in a WIN32 file like for the SDL package for other users. I sent an e-mail to the listed maintainer on Hackage yesterday, is that the best way to about doing this?

On Wed, Aug 27, 2008 at 4:40 AM, Bit Connor wrote:

...

Hi, I wrote the instructions in the WIN32 file.

This looks like the same problem that I originally had with the SDL package, mangling of "main" function in C land by the hand of the C SDL.h include file.

If you look at the .hsc files from the SDL package, you will see the fix I applied at the top of each file, after #including SDL.h the evil "main" macro is undefined:

#include "SDL.h" #ifdef main #undef main #endif

Probably the same must be done for all the .hsc files in SDL-image(and probably also all other haskell SDL addon packages).

Please let me know if this information is helpful.

2008/8/27 Garrick Chin :

...

Hello,

I'm trying to build the latest SDL-image package (0.5.2) from Hackage on Windows and encountering problems. These are the steps I've taken so far:

1. Downloaded SDL 1.2.13 developmental library for Mingw32 to E:\SDL-1.2.13, and SDL_image 1.2.6 developmental library for VC8 to E:\SDL_image-1.2.6. 2. Installed SDL package from Hackage, modifying the SDL.cabal according to the included WIN32 readme file and then runghc Setup.lhs configure/build/install 3. Downloaded the SDL-image package from Hackage, modified the SDL-image.cabal file to add the line "Include-Dirs: E:\SDL_image-1.2.6\include\SDL, E:\SDL-1.2.13\include\SDL" so Cabal can find the header files. After doing "runghc Setup.lhs configure", "runghc Setup.lhs build -v" gives me the following output:

Creating dist\build (and its parents) Creating dist\build\autogen (and its parents) Preprocessing library SDL-image-0.5.2... Creating dist\build\Graphics\UI\SDL\Image (and its parents) E:\ghc\ghc-6.8.2\bin\hsc2hs.exe --cc=E:\ghc\ghc-6.8.2\bin\ghc.exe --ld=E:\ghc\ghc-6.8.2\bin\ghc.exe --cflag=-package --cflag=SDL-0.5.4 --cflag=-package --cflag=base-3.0.1.0 --cflag=-IE:\SDL_image-1.2.6\include\SDL --cflag=-IE:\SDL-1.2.13\include\SDL -o dist\build\Graphics\UI\SDL\Image\Version.hs Graphics\UI\SDL\Image\Version.hsc E:/ghc/ghc-6.8.2/libHSrts.a(Main.o)(.text+0x7):Main.c: undefined reference to `__stginit_ZCMain' E:/ghc/ghc-6.8.2/libHSrts.a(Main.o)(.text+0x36):Main.c: undefined reference to `ZCMain_main_closure' collect2: ld returned 1 exit status linking dist\build\Graphics\UI\SDL\Image\Version_hsc_make.o failed command was: E:\ghc\ghc-6.8.2\bin\ghc.exe dist\build\Graphics\UI\SDL\Image\Version_hsc_make.o -o dist\build\Graphics\UI\SDL\Image\Version_hsc_make.exe

The results of a limited google search suggests that the __stginit_ZCMain linker error has to do with GHC expecting a main function, but I'm not really sure how that works in context of a library.

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