Re: Pure space

[Eli Zaretskii]

> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Sat, 17 Aug 2024 05:10:29 -0700
> Cc: Eli Zaretskii <eliz@gnu.org>, Pip Cet <pipcet@protonmail.com>, 
> emacs-devel@gnu.org
> 
> Po Lu <luangruo@yahoo.com> writes:
> 
> > Portable dumping doesn't function on Windows 98 or DOS.  Please fix or
> > implement pdumper on these two platforms first, or hack their unexec
> > builds not to require pure space, which should not be terribly
> > difficult.
> 
> In my view, that's not a blocker for removing the unexec build.

Agreed.

> We would take patches to fix MS-DOS and/or Windows 98, I think.

On Windows 9X the pdumper build does work, it just crashes too much.
So it sounds like some problem that could be fixed.

If we want to keep the MSDOS port, the way forward is to switch it to
pdumper.  There's already an implementation in pdumper.c that uses
malloc and write instead of the missing mmap, it just was never tried
with the MSDOS port.  I don't see any reasons why it couldn't work.