Re: [Mingw-users] Re: DLLS

[Jiri K. <jirikrivanek@BetaControl.cz>]

> Hi Jiri,
>
>
> "Jiri Krivanek" <jirikrivanek@BetaControl.cz> writes:
> > When I use the above mentioned technique, I receive the following
> > linker error message (please note that this is only one of many):
> > ...:main.c: undefined reference to 'GdipDeletePen@4'
>
> So your example was incomplete in a central aspect.  :-(

Sorry for that, I discovered this later as I have not known anything
about mangling ...

>
> As you have already discovered, "...@4" indicates that __stdcall is
> used with the functions that you want.  Note that most Windows API use
> that calling convention.  Sadly the internal representation of the
> symbols, with the "...@4", is not the same as the one regularly used
> by Windows APIs, without decoration.
>
> So lets try again.  I add __stdcall to the prototype and definition of
> Mul().  I execute
>
>  c:\tmp> gcc -shared -Wl,--kill-at -o kkh.dll kkh.c
>  c:\tmp> objdump -p kkh.dll | grep Mul
> 	[   0] Mul
>
> To get a DLL that matches your requirements.
>
> Now I'd expect that
>
>  c:\tmp> gcc -Wl,--enable-stdcall-fixup -o kkh-user.exe ^
>          kkh-user.c kkh.dll
>
> should work, but sadly it doesn't.  This may be a bug in the linker or
> a misunderstanding of --enable-stdcall-fixup on my part.
>
> So I use the traditional method.  Create a module definition file that
> matches the DLL and from that make an import library
>
> >>>>>>>>> kkh.def
> LIBRARY 'KKH.DLL'
> EXPORTS
> 	Mul@8
> <<<<<<<<<
>
>  c:\tmp> dlltool --kill-at --input-def kkh.def --output-lib kkh.lib
>
> This links and works:
>
>  c:\tmp> gcc -o kkh-user.exe kkh-user.c kkh.lib
>  c:\tmp> kkh-user
>  2*2=4
>
> So the process is: Create a function list for the GDI+ DLLs (use a
> script based on objdump), add the right suffixes (4 *
> number-of-parameters) and create an import library.  And they lived
> happily ever after ;-).
>
>
> Hope this helps, benny
>
>
>
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  Ing. Jiri Krivanek
  Realtime applications programmer
  Beta Control s.r.o.
  Cerneho 58/60
  635 00 BRNO-Bystrc
  CZECH REPUBLIC
  tel.: +420 5 46 22 34 91 - 36
  email 1: JiriKrivanek@BetaControl.cz