From:	btuysser AT qualcomm DOT com (Bijan Tuysserkani)
Subject:	msvc dll and gcc
17 Jul 1997 17:31:38 -0700 :
Approved:	cygnus DOT gnu-win32 AT cygnus DOT com
Distribution:	cygnus
Message-ID:	<3.0.1.32.19970717174505.009791b0.cygnus.gnu-win32@smtphost-co.qualcomm.com>
Mime-Version:	1.0
X-Sender:	btuysser AT smtphost-co DOT qualcomm DOT com
X-Mailer:	Windows Eudora Pro Version 3.0.1 (32)
Original-To:	"gnu-win32 AT cygnus DOT com" <gnu-win32 AT cygnus DOT com>
Original-Sender:	owner-gnu-win32 AT cygnus DOT com

Hi,

I want to use some functions of a dll library in my code
that gets compiled with gcc. To test if that works I created
a small dll example that works fine under msvc.

Then I created a def file and used 

dlltool --def foo.def --dllname foo.dll --output-lib foo.a

That worked fine. 

But when I link it with together with footest.c, which calls the 
dll-function, I get this result :

bash$ gcc footest.c foo.a -o footest.exe
C:\TEMP\cc0014041.o(.text+0x2e):footest.c: undefined reference to `myhello'
gcc: Internal compiler error: program ld got fatal signal 1

Below are the sources I use :

-----------------------------------------------------------------
foo.c : source file for dll, compiled with msvc4.2

#include "stdio.h"

__declspec(dllexport) void myhello()
{
	printf("hello world\n");
}
-----------------------------------------------------------------
footest.c : source for gcc 

#include "stdio.h"

extern void myopinion();

int main()
{
	printf("start my dll function\n");
	myopinion();
	return(0);
}
-----------------------------------------------------------------
foo.def : 

LIBRARY foo
EXPORTS
myhello AT 0

------------------------------------------------------------------
output of nm :
bash$ nm foo.a | grep T
00000000 T _myhello AT 0


I then downloaded the directX package from  
http://dragon.acadiau.ca/~025668b/develop/cygnus
but again, when I tried to compile it with 

 gcc main.c libddraw.a -o main.exe

I get this :

C:\TEMP\cc0014301.o(.text+0x72):main.c: undefined reference to
`CreateWindowExA AT 48'
C:\TEMP\cc0014301.o(.text+0x88):main.c: undefined reference to `ShowWindow AT 8'
C:\TEMP\cc0014301.o(.text+0x93):main.c: undefined reference to
`UpdateWindow AT 4'
C:\TEMP\cc0014301.o(.text+0xa7):main.c: undefined reference to
`GetMessageA AT 16'
C:\TEMP\cc0014301.o(.text+0xb9):main.c: undefined reference to
`TranslateMessage AT 4'
C:\TEMP\cc0014301.o(.text+0xc2):main.c: undefined reference to
`DispatchMessageA AT 4'
C:\TEMP\cc0014301.o(.text+0x22c):main.c: undefined reference to
`GetStockObject AT 4'
C:\TEMP\cc0014301.o(.text+0x241):main.c: undefined reference to
`RegisterClassA AT 4'
C:\TEMP\cc0014301.o(.text+0x289):main.c: undefined reference to `BeginPaint AT 8'
C:\TEMP\cc0014301.o(.text+0x29b):main.c: undefined reference to `EndPaint AT 8'
C:\TEMP\cc0014301.o(.text+0x2a5):main.c: undefined reference to
`PostQuitMessage AT 4'
C:\TEMP\cc0014301.o(.text+0x2bd):main.c: undefined reference to
`DefWindowProcA AT 16'
gcc: Internal compiler error: program ld got fatal signal 1

output of nm :

bash$ nm libddraw.a | grep T
00000000 ? ___imp_thk3216_ThunkData32
00000000 T _thk3216_ThunkData32
00000000 ? ___imp_thk1632_ThunkData32
00000000 T _thk1632_ThunkData32
00000000 T _VidMemLargestFree
00000000 T _VidMemInit
00000000 T _VidMemFree
00000000 T _VidMemFini
00000000 T _VidMemAmountFree
00000000 T _VidMemAlloc
00000000 T _InternalUnlock
00000000 T _InternalLock
00000000 T _DllGetClassObject
00000000 T _DllCanUnloadNow
00000000 T _DirectDrawEnumerateW
00000000 T _DirectDrawEnumerateA
00000000 T _DirectDrawCreateClipper
00000000 T _DirectDrawCreate
00000000 T _DSoundHelp
00000000 T _DDInternalUnlock
00000000 T _DDInternalLock
00000000 T _DDHAL32_VidMemFree
00000000 T _DDHAL32_VidMemAlloc

Does anybody know why the linker cannot find the symbols?

thanks in advance,

	Bijan
                                                          /\
                                                  .  /\  /  \
------------------------------------------------ / \/  \/    \
Bijan Tuysserkani                               /      /      \
Qualcomm Inc.                                                  \
5450 Western Ave.                             
Boulder, CO  80301                        (303) 473-6852 (voice)
btuysser AT qualcomm DOT com                     (303) 473-6665 (fax)

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