Re: MPS: Please check if scratch/igc builds with native compilation

[Eli Zaretskii <eliz@gnu.org>]

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: Emacs Devel <emacs-devel@gnu.org>,  Eli Zaretskii <eliz@gnu.org>,
>   Helmut Eller <eller.helmut@gmail.com>
> Date: Tue, 21 May 2024 20:09:50 +0200
> 
> Andrea Corallo <acorallo@gnu.org> writes:
> 
> > At least here the error seems reproducible.  Bootstrapping with -j1
> > makes native compiling leim/ja-dic/ja-dic.el always fail.
> >
> > And if I run it under gdb I see we get a SIGSEGV in
> > 'maybe_resize_hash_table' at fns.c:4987
> >
> > memcpy (key, h->key, old_size * sizeof *key);
> 
> That's a new one for me. Maybe you are hitting a read/write barrier?
> I think Eli & Helmut can help here with what to do for the signals in
> GDB. (On macOS, MPS is using Mach exceptions, not signals.)

If this is a SIGSEGV due to a write barrier, you can "continue" the
program and it continues running.  If it's a real SIGSEGV, typing
"continue" will hit the same SIGSEGV again.