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From: "A. Wik (awik32 AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Date: Sun, 28 Jan 2024 19:21:05 +0000
Message-ID: <CALPW7mR5mhoPsN5sjM+AVDb-CMZEg8vC39m0e5V1+bMrhQfaXQ@mail.gmail.com>
Subject: Re: gcc complains about "no DPMI memory"
To: djgpp AT delorie DOT com
Content-Type: text/plain; charset="UTF-8"
Reply-To: djgpp AT delorie DOT com

On Sun, 28 Jan 2024 at 17:45, Eli Zaretskii (eliz AT gnu DOT org) [via
djgpp AT delorie DOT com] <djgpp AT delorie DOT com> wrote:
>
> >
> > I set it to 65535 KB, the highest setting allowed, and now it works!
>
> Great, happy hacking.

Thanks.  Today's main insight is that Microsoft C 5.10 (copyright date
1988) is not really K&R (first ed.), but DeSmet PCC 1.2d (copyright
date 1993) is.  The former understands ANSI "1" "2" "3" string
concatenation, hexadecimal character codes '\x41", and C++ style //
comments.  The latter compiler supports none of these features.

Incidentally, a friend of mine was able to get in touch with the
copyright holders of DeSmet C, and received permission to opensource
it, so it is now available at:
http://www.desmet-c.com/

> > "Explicitly to require vast amounts of memory"?  Like an end in itself?
>
> Yes.  The idea was that if you take this as a design goal, the
> program's code will be very different from a typical Unix program
> (recall that Unix was originally a 16-bit OS), so there will be no
> danger someone will try to sue GNU for stealing commercial code of
> other systems.

I played around with 16-bit Unix not so long ago -- Xenix to be
specific.  I've also spent a number of hours browsing the source code
of 7th Edition research Unix, and I found it very elegant.

> > Why did I never have to change this setting before?
>
> I don't know.  Maybe you've run Windows 98 in a different VM?  Or
> maybe you used an older version of GCC/Binutils?

I figured it out.  I had created a "custom" version of the MS-DOS
prompt PIF, and I had set the DPMI memory explicitly.  I tried
starting "command" with the "Run..." option from the Start menu, and I
found that gcc would work just fine.  It turns out that it's best to
leave the DPMI memory setting as "Auto".  To illustrate:

C:\proj\debug>go32-v2
go32/v2 version 2.0 built Oct 18 2015 09:41:08
Usage: go32 coff-image [args]
...
DPMI memory available: 226725 Kb
DPMI swap space available: 31959 Kb

-Albert.