GNU bug report logs - #76559
31.0.50; [-O3 + PGTK] Crash when 'copying as kill'/'killing word'

Previous Next

Full log

View this message in rfc822 format

From: Iurie Marian <marian.iurie <at> gmail.com>
To: Po Lu <luangruo <at> yahoo.com>
Cc: Pip Cet <pipcet <at> protonmail.com>, eggert <at> cs.ucla.edu, iura.mail <at> gmail.com, stefankangas <at> gmail.com, michael.albinus <at> gmx.de, Eli Zaretskii <eliz <at> gnu.org>, 76559 <at> debbugs.gnu.org
Subject: bug#76559: 31.0.50; [-O3 + PGTK] Crash when 'copying as kill'/'killing word'
Date: Thu, 27 Feb 2025 19:50:25 +0100

[Message part 1 (text/plain, inline)]

@Po Lu: I have just tested, your proposal and of course it works well (I've
used that build version for a while).

Btw, I noticed that this crash occurs ONLY for builds where -O3 and LTO are
used together.

On Thu, 27 Feb 2025 at 14:30, Po Lu <luangruo <at> yahoo.com> wrote:

> Eli Zaretskii <eliz <at> gnu.org> writes:
>
> >> Date: Thu, 27 Feb 2025 12:22:36 +0000
> >> From: Pip Cet <pipcet <at> protonmail.com>
> >> Cc: Po Lu <luangruo <at> yahoo.com>, marian.iurie <at> gmail.com,
> >> michael.albinus <at> gmx.de, iura.mail <at> gmail.com, 76559 <at> debbugs.gnu.org,
> >> Stefan Kangas <stefankangas <at> gmail.com>, Paul Eggert
> >> <eggert <at> cs.ucla.edu>
> >>
> >> "Eli Zaretskii" <eliz <at> gnu.org> writes:
> >>
> >> > I believe we should recommend against using -O3.  Too many bad bugs
> >>
> >> If we do that, can we include link time optimization in that?  I find
> >> LTO'd code extremely difficult to read, since things like the calling
> >> convention no longer apply (even when a function call isn't inlined, LTO
> >> can still conclude that some registers survive the call and reuse them
> >> even though the calling convention disagrees).
>
> It's marginally easier to read the RTL (which ultimately becomes no more
> than a Lisp-like representation of the assembly but with some tree
> expressions and analogous details preserved for reference,
> e.g. non-inlined procedure calls).
>
> > Maybe we should also recommend against LTO.  Paul, WDYT about this?
>
> I think there is no occasion to compile Emacs with any optimization
> options besides -O2.
>

[Message part 2 (text/html, inline)]

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.