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Re: [Mingw-cross-env-list] Link errors in SDL/Qt project

From: Volker Grabsch
Subject: Re: [Mingw-cross-env-list] Link errors in SDL/Qt project
Date: Fri, 16 Apr 2010 14:30:11 +0200
User-agent: Mutt/1.5.13 (2006-08-11)

Nikos Chantziaras <address@hidden> schrieb:
> >>TEMPLATE = app
> >>CONFIG += qt release
> >>LIBS += -lSDL -lSDL_mixer
> I found out there's a whole set of extra stuff needed.  I had to add all 
> the below:
> -lmikmod -lpthread -lsmpeg -lwsock32 -ldxguid -lvorbisfile -lvorbis -logg

You can find out all needed options via:

    i686-pc-mingw32-pkg-config --libs sdl
    i686-pc-mingw32-pkg-config --libs SDL_mixer

You can also combine these commands:

    i686-pc-mingw32-pkg-config --libs sdl SDL_mixer

If there's any dependency missing in those command outputs, please
report this to us. It would be a bug that has to be fixed in

I don't know whether you can incorporate that command via shell
backticks into your *.pro file:

    LIBS += -lSDL -lSDL_mixer

    win32 {
        LIBS += `i686-pc-mingw32-pkg-config --libs sdl SDL_mixer`

If that doesn't work, I suggest to mention those flags explicitly:

    LIBS += -lSDL -lSDL_mixer

    win32 {
        LIBS += -lmikmod -lpthread -lws2_32 ...

Note, however, that the exact list of required libraries might change
in future versions. For instance, we could decide to build SDL without
pthreads. Or we could support another sound library in SDL_mixer. So
if anything fails, don't forget to compare your list of libraries with
the outputs of:

    i686-pc-mingw32-pkg-config --libs sdl
    i686-pc-mingw32-pkg-config --libs SDL_mixer
    i686-pc-mingw32-pkg-config --libs ...

> The application links, but doesn't run in Windows (exits immediately 
> when double clicking).  In Wine, it hangs indefinitely with:
> err:ntdll:RtlpWaitForCriticalSection section 0x11ad510 "?" wait timed 
> out in thread 0009, blocked by 0000, retrying (60 sec)

This seems to be a pthread problem with SDL oder SDL_mixer. Please have
a look at:


It would be great if you could try the advices I gave there. The
original poster didn't respond yet.

Alternatively, you could try to fix the pthread library. For technical
reasons, it is built as part of the GCC build, in src/gcc.mk, lines 62-71.
The idea was to use pthreads to support OpenMP, but that doesn't really
work and noone had yet found the time to fix it.

Any investigation on that topic is greatly appreciated.



Volker Grabsch
NotJustHosting GbR

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