Re: Creating Dos/4gw Dynamic Link Libraries?

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From	Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid>
Newsgroups	openwatcom.users.c_cpp
Subject	Re: Creating Dos/4gw Dynamic Link Libraries?
Date	Tue, 2 Jan 2018 07:16:17 +0800
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Frank Beythien wrote:
> Am 01.01.2018 um 13:57 schrieb Johann 'Myrkraverk' Oskarsson:
>> Dear Open Watcom,
>>
>> How do you create dynamic link libraries for Dos/4gw?  So far
>
> I don't find DOS/4G DLLs mentioned in the docs, but I don't program
 > Dos any more.

See the Linker Guide, The OS/2 Executable and DLL File Formats, of
all places.

I have found no explicit examples though.  And the message I included
in my original post shows that Open Watcom (thinks it) knows how to
make Dos/4G DLLs.

> It would help if you posted a minimal (compiling!) example with the
> complete wcc386 and wlink cmdlines output to see which version you are
> using.

What do you mean?  The makefile I listed shows the explicit wlink
command.  I am using Open Watcom 1.9 (in DOSBox for this exercise).

I was missing the -bd option when compiling foo.c, this edited makefile
(below) shows a new error,

   Error! E2028: __DLLstart_ is an undefined reference.
   Error! E2028: main_ is an undefined reference.

It ends with:
   file clib3r.lib(cmain386.c): undefined symbol main_
and does not list explicitly what links to __DLLstart_.

Do I need both __DLLstart() and main()?  How do I link
in __DLLstart()?  Or do I need to define it myself?

Again, won't main() in the DLL conflict with my application's main()?

## file: Makefile

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

foo.obj: foo.c
	wcc386 -bd -6r foo.c

## end: Makefile

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

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Thread

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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