From: geier AT forwiss DOT uni-passau DOT de (Roland Geier)
Subject: Re: DLL Problem
24 Aug 1997 08:45:21 -0700
Approved: cygnus DOT gnu-win32 AT cygnus DOT com
Distribution: cygnus
Message-ID: <199708212048.WAA07599.cygnus.gnu-win32@bombadill.forwiss.uni-passau.de>
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In-Reply-To: <199708201219.OAA01103@hugo.int-evry.fr> from Stephane Mariel at "Aug 20, 97 02:19:29 pm"
Original-To: stf AT hugo DOT int-evry DOT fr (Stephane Mariel)
Original-Cc: gnu-win32 AT cygnus DOT com
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> I'm trying to port a tcl module from unix to win95 as a dll to load within
> wish.
>
> So i tried to began with the example provided on cygnus.com , it works
> fine, i got my foo.dll, main.exe, but moving to my real software when I run
> ld I got:
> c:/gnuwin32/b18/H-i386-cygwin32/i386-cygwin32/lib/libcygwin.a(libccrt0.o)(.t
>
> ext+0x8a):libccrt0.cc: undefined reference to `GetModuleHandleA AT 4'
> c:/gnuwin32/b18/H-i386-cygwin32/i386-cygwin32/lib/libcygwin.a(libcmain.o)(.t
>
> ext+0xc):libcmain.cc: undefined reference to `GetModuleHandleA AT 4'
> c:/gnuwin32/b18/H-i386-cygwin32/i386-cygwin32/lib/libcygwin.a(libcmain.o)(.t
>
> ext+0x15):libcmain.cc: undefined reference to `GetCommandLineA AT 0'
> c:/gnuwin32/b18/H-i386-cygwin32/i386-cygwin32/lib/libcygwin.a(libcmain.o)(.t
>
> ext+0x1e):libcmain.cc: undefined reference to `WinMain AT 16'
>
> This seems to be a reentrancy problem, since a simple call like :
> fprintf(stderr, ...)

....for me this seems to be a forgotten '-lkernel32' at link-time :). The
undefined ref to 'WinMain' can be avoided with:

        echo 'int main() { return 0; }' > fixup.c;
        echo 'asm (".section .idata$3\n" ".long 0,0,0,0,0,0,0,0");' >> fixup.c;
        gcc -c fixup.c
        # link fixup.o with your dll...

hth,

--- Roland.

---
Roland Geier                    Phone: ++49 (8505) 92182          
Universitaet Passau, GER 	Fax:   ++49 (8505) 922311
Lehrstuhl Prof. Dr. Donner      geier AT forwiss DOT uni-passau DOT de	
D-94032 Passau                  http://www.uni-passau.de/~geier/





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