bug#36649: 27.0.50; pure space and pdumper

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: eggert@cs.ucla.edu,  rpluim@gmail.com,  stefan@marxist.se,
>   schwab@linux-m68k.org,  monnier@iro.umontreal.ca,  pipcet@gmail.com,
>   36649@debbugs.gnu.org,  akrl@sdf.org
> Date: Wed, 12 May 2021 20:25:21 +0200
> 
> make[2]: Entering directory '/home/larsi/src/emacs/pure/lisp'
>   ELC      international/titdic-cnv.elc
> Fatal error 11: Segmentation fault
> Backtrace:
> ../src/bootstrap-emacs[0x525571]
> ../src/bootstrap-emacs[0x4203b6]
> ../src/bootstrap-emacs[0x420889]
> ../src/bootstrap-emacs[0x523b5d]
> ../src/bootstrap-emacs[0x523bd9]
> /lib/x86_64-linux-gnu/libpthread.so.0(+0x14140)[0x7f3d1517c140]
> 
> So I'm not able to build an unexec build on GNU/Linux at all.
> 
> If this is the case in general, and not just here on this
> Debian/bullseye system, then I think we should consider getting rid of
> both unexec and pure space now, and not wait any longer.

Someone built the master branch with unexec just a few days ago, see

  https://lists.gnu.org/archive/html/emacs-devel/2021-05/msg00060.html