gcc and microsoft linker

[Dibyendu Ghosh <dghosh at synopsys dot com>]

Hi,

In my project which is on Windows NT 4.0, I am in a situation where, I need
to build most of the source files using gcc and some files using cl.exe
(which comes with microsoft vc++ 6.0). I was getting some problem, so to
simulate it using a small sample project I tried all possible options using
gcc, cl and link.exe (which comes with vc6.0). I just created a file
mainfunc.c with the following contents:

extern void libfunc();

int main()
{
	libfunc();
	return 0;
}

And another source file, libfunc.c with the following contents:

#include<stdio.h>

void libfunc()
{
	printf("From LibFunc\n");
}

And then I compile these two files and generate mainfunc.o, libfunc.o,
mainfunc.obj, libfunc.obj.
And the I try to build my executable using all possible combinations.

What I find is that link.exe doesn't understand mainfunc.o much and gives
one unresolved external as follows:

Full output from link.exe:
==========================

Microsoft (R) 32-Bit Incremental Linker Version 5.10.7303
Copyright (C) Microsoft Corp 1992-1997. All rights reserved.


Searching Libraries
    Searching d:\Programs\Micros~1\VC98\LIB\LIBC.lib:
    Searching d:\Programs\Micros~1\VC98\LIB\OLDNAMES.lib:
    Searching d:\Programs\Micros~1\VC98\LIB\kernel32.lib:
    Searching d:\Programs\Micros~1\VC98\LIB\LIBC.lib:
    Searching d:\Programs\Micros~1\VC98\LIB\OLDNAMES.lib:

Done Searching Libraries
mainfunc.o : error LNK2001: unresolved external symbol ___main
gcctest3.exe : fatal error LNK1120: 1 unresolved externals

=====================================================================

Then I tried to resolve this by passing libcygwin.a also to link.exe, it
builds the executable, but generates a warning, and later GPF occurs when
running the executable. How do I resolve this problem?

======================================================================
Full output from linker in this case:
_____________________________________

Microsoft (R) 32-Bit Incremental Linker Version 5.10.7303
Copyright (C) Microsoft Corp 1992-1997. All rights reserved.


Searching Libraries
    Searching
c:\Cygnus\cygwin-b20\h-i586-cygwin32\i586-cygwin32\lib\libcygwin.a:
libcygwin.a(ds7.o) : warning LNK4078: multiple ".idata" sections found with
different attributes (40000000)
    Searching d:\Programs\Micros~1\VC98\LIB\LIBC.lib:
    Searching d:\Programs\Micros~1\VC98\LIB\OLDNAMES.lib:
    Searching d:\Programs\Micros~1\VC98\LIB\kernel32.lib:

Done Searching Libraries
____________________________________________________________________________
_________________________________
============================================================================
=================================

Any suggestions/comments on this problem are most welcome!
With Thanks in Advance,
Dibyendu Ghosh