bug#36649: 27.0.50; pure space and pdumper

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  Pip Cet <pipcet@gmail.com>,
>   36649@debbugs.gnu.org,  monnier@iro.umontreal.ca
> Date: Sat, 02 Jul 2022 18:28:40 +0800
> 
> Lars Ingebrigtsen <larsi@gnus.org> writes:
> 
> > If I understand correctly, dropping pure space would make Po's work on
> > improving the garbage collector easier -- and improving gc is important,
> > so it seems to make sense to get rid of pure space just for that reason.
> >
> > But I'm not against dropping unexec now, too -- we can drop both unexec
> > and pure space now.
> 
> FWIW none of the dumping mechanisms work with the new garbage collector,
> but it will be optional, since I don't see how to make it work on MS-DOS
> (which AFAIU has no equivalent of `mprotect').

The C library and the environment used by the MS-DOS port do have
mprotect, but it is only supported with some DPMI servers, and the
MS-Windows DPMI server is not one of them.

But I don't think this is too relevant, since memory protection in
MS-DOS is more or less a no-op.