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Re: (select-window nil) crash with gcc-8.2.0

From: Paul Eggert
Subject: Re: (select-window nil) crash with gcc-8.2.0
Date: Tue, 9 Apr 2019 19:01:41 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

Richard Stallman wrote:

Thank you.

It is very very important to report the bugs we find in other
programs, both GNU packages and others.

Yes, a bug was going to be reported one way or another, by Madhu or by me. This test case seems to have uncovered two GCC bugs, one introduced in GCC 4.9.x in 2014, and one that seems to predate that. Richard Biener is testing an overall patch.

I considered putting something into etc/PROBLEMS warning people not to compile Emacs with gcc -O2 -Os, but apparently that sort of GCC usage is pretty rare so it's not clear it's worth documenting it (plus, the advice is not specific to Emacs).

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