Linking with .LIB files

Thu Mar 27 20:59:00 GMT 1997

Text item: 

     Okay, I've pulled together the feedback and made a few more attempts.

     I compile the program using:
        gcc -o simple.c

     and link using:

     link simple.o libc.a libcygwin.a libkernel32.a libuser32.a glu32.lib 
     opengl32.lib libgdi32.a /subsystem:windows /machine:i386 
     /entry:mainCRTStartup

     The output:

//f/pgming/opengl/simple$ make
link simple.o libc.a libcygwin.a libkernel32.a libuser32.a glu32.lib opengl32.li
b libgdi32.a /subsystem:windows /machine:i386 /entry:mainCRTStartup
Microsoft (R) 32-Bit Incremental Linker Version 5.00.7022
Copyright (C) Microsoft Corp 1992-1997. All rights reserved.

libcygwin.a(libccrt0.o) : error LNK2001: unresolved external symbol ___CTOR_LIST
__
libcygwin.a(libccrt0.o) : error LNK2001: unresolved external symbol ___DTOR_LIST
__
libcygwin.a(libccrt0.o) : error LNK2001: unresolved external symbol __data_start
__
libcygwin.a(libccrt0.o) : error LNK2001: unresolved external symbol __data_end__

libcygwin.a(libccrt0.o) : error LNK2001: unresolved external symbol __bss_start_
_
libcygwin.a(libccrt0.o) : error LNK2001: unresolved external symbol __bss_end__
simple.exe : fatal error LNK1120: 6 unresolved externals
make: *** [simple.exe] Error 25
//f/pgming/opengl/simple$

     I greped the contents of every .a I could find and there's no trace of a 
     __data_start__ tag anywhere.  I grep them by doing the following:

        mkdir out
        for x in *.a; do nm $x > out/$x; done;
        cd out
        egrep data_start *

     This has the advantage of telling me which file any matches are found.  It 
     worked quite well for finding _GetModuleHandleA@4.  I also checked crt0.o 
     just in case.  Maybe the compiler was suppose to generate these symbols?  
     Or maybe it's something ld understands but link doesn't?

     Simple.c is a very simple windows program (with a WinMain) that calls 
     OpenGL primitives.  I copied it from a companion CD of a book to use for 
     testing this out.

     The GNU-Win32 I'm using I pulled from 
        ftp://ftp.cygnus.com/pub/gnu-win32/latest/all.tar.gz

     Apparently this is b17, not b17.1.  Sounds like getting the patches to 
     b17.1 should resolve the issue of using OpenGL.  Though I'm still 
     interested in getting this to work.  (call me stubborn if you like)

     So, any ideas about why I'm missing these symbols and what can I do about 
     it?

     Thanks, for the help guy's!  I do appreciate it!

     Dave

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References: <Wed, 26 Mar 97 10:42:13 PST_6@ccm.jf.intel.com>
Subject: Re: Linking with .LIB files
CC: gnu-win32@cygnus.com, colin@bird.fu.is.saga-u.ac.jp
To: David W Palmer <David_W_Palmer@ccm.jf.intel.com>
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From: Jim Balter <jqb@netcom.com>
Date: Thu, 27 Mar 1997 00:46:40 -0800
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