Mail Archives: cygwin/1998/07/24/09:30:38
On Thu, 23 Jul 1998, Aaron Schweiger wrote:
> I am trying to link the mgui graphics library under gnu-win32, however,
> I keep getting linking errors:
>
> e:\MINGW32\LIB\GCC-LIB\i386-mingw32\egcs-2.90.27\../../..\libmguiw.a(mguiinit.o)(.text+0x2ad):mguiinit.c:
> undefined reference to `MessageBoxA'
> e:\MINGW32\LIB\GCC-LIB\i386-mingw32\egcs-2.90.27\../../..\libmguiw.a(mguiinit.o)(.text+0x904):mguiinit.c:
> undefined reference to `GetModuleFileNameA'
>
> Quite clearly, the library I am linking is forgetting the @16 needed at
> the end of the function name. Can I resolve this problem?
>
Hmmm ... looks like something is redefining STDCALL somewhere, and that's
the root of your problem. In Windows32/ASCIIFunctions.h, MessageBoxA is
declared as the following:
int
STDCALL
MessageBoxA (
/* parameters here
/* parameters here );
You must be including some header *before* windows.h that's redefining
STDCALL to *nothing* and hence gcc doesn't know that it should append
the @16 to the name of the function and also generate the right code
for pascal-style calling convention required.
Check for messages when compiling and see if there are any messages like:
......[file name]: ##: warning: STDCALL redefined.
......[ another ]: ##: warning: STDCALL first defined here.
That should get you started. Also, make sure that you've not changed the
GCC specs files.
fyi, STDCALL is defined to __stdcall__((attribute)) in <Windows32/Base.h>
iff i386 is defined by pre-processor (which is should be in your case).
Regards,
Mumit
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