Creating Dos/4gw Dynamic Link Libraries?

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From	Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid>
Newsgroups	openwatcom.users.c_cpp
Subject	Creating Dos/4gw Dynamic Link Libraries?
Date	Mon, 1 Jan 2018 20:57:38 +0800
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Dear Open Watcom,

How do you create dynamic link libraries for Dos/4gw?  So far
I have this source code.

// file: foo.h
char * __export foo( void );

// end: foo.h

// file: foo.c

#include "foo.h"

char * __export foo( void ) {
   return "bar";
}
// end: foo.c

and this make file.

## file: Makefile

foo.dll: foo.obj
	wlink system 386 dll option map name foo file foo

foo.obj: foo.c
	wcc386 -bt=386_dll -6r foo.c

## end: Makefile

Wlink tells me it's

   creating DOS/4G dynamic link library

so I know I have most of the steps correct.  However,

   file foo.obj: undefined symbol __CHK

(slightly edited)

How do I get rid of that undefined symbol?  If I link with
the C library, clib3r, it finds __CHK but complains about
a missing main_.  Do I need a main() in a DLL?  Will that
not conflict with the application's main()?


-- 
Johann | email: invalid -> com | www.myrkraverk.com/blog/
I'm not from the Internet, I just work there. | twitter: @myrkraverk

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Creating Dos/4gw Dynamic Link Libraries? Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2018-01-01 20:57 +0800
  Re: Creating Dos/4gw Dynamic Link Libraries? Frank Beythien <fbeythien@gmx.de> - 2018-01-01 21:16 +0100
    Re: Creating Dos/4gw Dynamic Link Libraries? Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2018-01-02 07:16 +0800
      Re: Creating Dos/4gw Dynamic Link Libraries? Frank Beythien <fbeythien@gmx.de> - 2018-01-02 13:47 +0100
        Re: Creating Dos/4gw Dynamic Link Libraries? Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2018-01-03 17:01 +0800
      Re: Creating Dos/4gw Dynamic Link Libraries? Paul S. Person <psperson@ix.netscom.com.invalid> - 2018-01-02 09:53 -0800

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