From: Paul Eggert <eggert@cs.ucla.edu>
To: Eli Zaretskii <eliz@gnu.org>
Cc: larsi@gnus.org, 49261@debbugs.gnu.org
Subject: bug#49261: Segfault during loadup
Date: Tue, 13 Jul 2021 18:12:00 -0500 [thread overview]
Message-ID: <b76d7594-066d-d59d-e05a-6dbf372fbf15@cs.ucla.edu> (raw)
In-Reply-To: <83o8b7a5ow.fsf@gnu.org>
On 7/12/21 10:54 AM, Eli Zaretskii wrote:
> Then what is the -Woverflow option for? Can you show an example of
> code which -Woverflow would flag that doesn't produce a bogus warning?
Sure: the GCC documentation says -Woverflow is supposed to warn about
"compile-time overflow in constant expressions". So GCC should (and
does) warn about this top-level declaration:
int x = INT_MAX + 1;
However, there is no overflow here:
unsigned a = -1, b = INT_MIN, c = LLONG_MAX;
and these declarations have well-defined behavior in C, so -Woverflow
should not issue warnings for them even though they are unsigned
conversions that change numeric values.
It might be useful to some programmers to generate warnings about these
unsigned conversions, but this should be a separate -W option not
-Woverflow. There's no overflow here.
next prev parent reply other threads:[~2021-07-13 23:12 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-28 17:38 bug#49261: 28.0.50; File Locking Breaks Presumptuous Toolchains Mallchad Skeghyeph
2021-06-30 13:00 ` Lars Ingebrigtsen
2021-06-30 13:26 ` Eli Zaretskii
2021-06-30 14:08 ` Lars Ingebrigtsen
[not found] ` <CADrO7Mje3DstmjxutZcpx33jWJwgE_z+hGfJc4aON1CYOpyJxA@mail.gmail.com>
2021-07-01 10:55 ` Lars Ingebrigtsen
2021-07-01 12:58 ` Eli Zaretskii
2021-06-30 16:07 ` Michael Albinus
2021-06-30 16:16 ` Eli Zaretskii
2021-07-01 11:38 ` Lars Ingebrigtsen
2021-06-30 19:31 ` Juri Linkov
2021-07-01 16:57 ` Michael Albinus
2021-07-01 18:31 ` Eli Zaretskii
2021-07-02 11:06 ` Lars Ingebrigtsen
2021-07-02 12:32 ` Michael Albinus
2021-07-07 16:01 ` Lars Ingebrigtsen
2021-07-07 16:07 ` Michael Albinus
2021-07-07 16:13 ` Lars Ingebrigtsen
2021-07-07 16:40 ` Michael Albinus
2021-07-07 16:57 ` Lars Ingebrigtsen
2021-07-07 16:55 ` Michael Albinus
2021-07-07 16:59 ` Lars Ingebrigtsen
2021-07-07 17:36 ` Michael Albinus
2021-07-07 18:08 ` Lars Ingebrigtsen
2021-07-07 18:33 ` Eli Zaretskii
2021-07-07 18:50 ` Lars Ingebrigtsen
2021-07-07 19:40 ` Lars Ingebrigtsen
2021-07-07 20:03 ` Michael Albinus
2021-07-08 6:03 ` Michael Albinus
2021-07-08 19:53 ` Michael Albinus
2021-07-09 6:30 ` Eli Zaretskii
2021-07-09 8:28 ` Michael Albinus
2021-07-09 10:45 ` Eli Zaretskii
2021-07-09 11:01 ` Michael Albinus
2021-07-09 16:31 ` Lars Ingebrigtsen
2021-07-12 13:53 ` Michael Albinus
2021-07-12 14:03 ` Eli Zaretskii
2021-07-12 14:37 ` Michael Albinus
2021-07-12 17:30 ` Eli Zaretskii
2021-07-12 17:35 ` Lars Ingebrigtsen
2021-07-12 17:38 ` Eli Zaretskii
2021-07-12 18:00 ` Michael Albinus
2021-07-12 18:25 ` Eli Zaretskii
2021-07-12 18:46 ` Michael Albinus
2021-07-12 19:04 ` Eli Zaretskii
2021-07-13 17:53 ` Michael Albinus
2021-07-13 16:30 ` Lars Ingebrigtsen
2021-07-13 16:31 ` Lars Ingebrigtsen
2021-07-13 16:41 ` Eli Zaretskii
2021-07-13 17:59 ` Michael Albinus
2021-07-13 19:00 ` Eli Zaretskii
2021-07-13 19:09 ` Lars Ingebrigtsen
2021-07-13 19:36 ` Michael Albinus
2021-07-13 17:55 ` Michael Albinus
2021-07-13 19:05 ` Lars Ingebrigtsen
2021-07-16 16:15 ` Michael Albinus
2021-07-17 14:06 ` Lars Ingebrigtsen
2021-07-07 20:05 ` Eli Zaretskii
2021-07-07 20:09 ` Lars Ingebrigtsen
2021-07-07 20:15 ` Eli Zaretskii
2021-07-07 20:10 ` Eli Zaretskii
2021-07-07 20:18 ` Lars Ingebrigtsen
2021-07-07 20:29 ` Lars Ingebrigtsen
2021-07-07 20:37 ` Lars Ingebrigtsen
2021-07-07 20:55 ` Lars Ingebrigtsen
2021-07-07 21:04 ` Lars Ingebrigtsen
2021-07-07 22:22 ` Lars Ingebrigtsen
2021-07-08 0:09 ` bug#49261: Segfault during loadup Lars Ingebrigtsen
2021-07-08 6:35 ` Eli Zaretskii
2021-07-08 12:51 ` Lars Ingebrigtsen
2021-07-11 8:36 ` Paul Eggert
2021-07-11 10:21 ` Eli Zaretskii
2021-07-11 15:25 ` Eli Zaretskii
2021-07-12 7:16 ` Paul Eggert
2021-07-12 12:07 ` Eli Zaretskii
2021-07-12 14:50 ` Paul Eggert
2021-07-12 14:56 ` Andreas Schwab
2021-07-12 15:54 ` Eli Zaretskii
2021-07-13 23:12 ` Paul Eggert [this message]
2021-07-14 7:42 ` Andreas Schwab
2021-07-14 22:04 ` Paul Eggert
2021-07-14 22:10 ` Andreas Schwab
2021-07-14 12:36 ` Eli Zaretskii
2021-07-14 22:24 ` Paul Eggert
2021-07-15 6:13 ` Eli Zaretskii
2021-07-11 11:32 ` Lars Ingebrigtsen
2021-07-08 6:15 ` bug#49261: 28.0.50; File Locking Breaks Presumptuous Toolchains Eli Zaretskii
2021-07-08 6:20 ` Eli Zaretskii
2021-07-08 12:44 ` Lars Ingebrigtsen
2021-07-08 13:11 ` Lars Ingebrigtsen
2021-07-08 13:13 ` Eli Zaretskii
2021-07-08 6:17 ` Eli Zaretskii
2021-07-08 12:42 ` Lars Ingebrigtsen
2021-07-08 12:49 ` Lars Ingebrigtsen
2021-07-08 13:16 ` Eli Zaretskii
2021-07-08 13:34 ` Lars Ingebrigtsen
2021-07-08 16:47 ` Eli Zaretskii
2021-07-10 16:25 ` Lars Ingebrigtsen
2021-07-10 17:04 ` Eli Zaretskii
2021-07-10 17:15 ` Lars Ingebrigtsen
2021-07-10 17:20 ` Eli Zaretskii
2021-07-07 18:02 ` Eli Zaretskii
2021-07-07 18:17 ` Lars Ingebrigtsen
2021-07-07 18:20 ` Lars Ingebrigtsen
2021-07-07 18:42 ` Eli Zaretskii
2021-07-07 18:58 ` Lars Ingebrigtsen
2021-07-07 19:03 ` Lars Ingebrigtsen
2021-07-07 19:20 ` Eli Zaretskii
2021-07-07 18:50 ` Eli Zaretskii
2021-07-07 19:22 ` Lars Ingebrigtsen
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