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

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Po Lu <luangruo <at> yahoo.com>
Cc: Pip Cet <pipcet <at> protonmail.com>, iura.mail <at> gmail.com, Stefan Kangas <stefankangas <at> gmail.com>, michael.albinus <at> gmx.de, Eli Zaretskii <eliz <at> gnu.org>, 76559 <at> debbugs.gnu.org, marian.iurie <at> gmail.com
Subject: bug#76559: 31.0.50; [-O3 + PGTK] Crash when 'copying as kill'/'killing word'
Date: Mon, 3 Mar 2025 00:02:13 -0800

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

On 2025-03-01 21:10, Po Lu wrote:
> It doesn't take control flow into account, but rather _every statement
> operand_ in the current procedure that addresses an aggregate declared
> in the same procedure.

Although, as you mentioned, we could work around this wrong-code GCC bug 
by using -fno-tree-sra (something we already do for GCC pre-SSE2 x86), 
we should avoid the tricky union locals that trigger the bug on x86-64 
with gcc -flto. After all, these union locals make the code harder for 
humans to read, so removing them is a win regardless of the GCC bug. And 
if removing the union locals happens to work around the GCC bug then so 
much the better.

Proposed patch attached.

[0001-Avoid-some-union-buffered_input_event-uses.patch (text/x-patch, attachment)]

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