From: Paul Eggert <eggert@cs.ucla.edu>
To: Eli Zaretskii <eliz@gnu.org>
Cc: fabrice.popineau@centralesupelec.fr, andrewjmoreton@gmail.com,
emacs-devel@gnu.org
Subject: Re: Suspicious warning in W64 build
Date: Sun, 17 Sep 2017 10:07:42 -0700 [thread overview]
Message-ID: <0feb1250-beb8-5a21-0582-c879f922bb1c@cs.ucla.edu> (raw)
In-Reply-To: <83bmm9jt23.fsf@gnu.org>
Eli Zaretskii wrote:
> UNINIT looked inappropriate to initialize a Lisp_Object which is
> supposed to be a number.
No, it's appropriate. UNINIT is merely a declaration directive. It tells GCC
"This variable is not initialized and that is OK; don't warn me about it, I know
that the initial value is never used even though you may not know." The current
UNINIT implementation would still work even if we were to change the Lisp_Object
representation so that all-zero would become invalid, because UNINIT declares
that the invalid value will not be used.
No code should depend on UNINIT initializing to zero, as this is not true in
general.
Although args[0] stops GCC from complaining, it is less useful than UNINIT
because it will make cleanup more difficult in the future. We're already using
UNINIT for Lisp_Object variables elsewhere, so we already know it's safe to use
here.
next prev parent reply other threads:[~2017-09-17 17:07 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-05 13:38 Suspicious warning in W64 build Angelo Graziosi
2017-09-05 14:04 ` Richard Copley
2017-09-07 15:16 ` Eli Zaretskii
2017-09-07 15:42 ` Angelo Graziosi
2017-09-07 17:52 ` Richard Copley
2017-09-07 17:58 ` Richard Copley
2017-09-07 19:00 ` Angelo Graziosi
2017-09-07 19:21 ` Richard Copley
2017-09-09 4:58 ` Herring, Davis
2017-09-09 9:55 ` Richard Copley
2017-09-09 10:20 ` Eli Zaretskii
2017-09-09 11:24 ` Angelo Graziosi
2017-09-09 13:25 ` Eli Zaretskii
2017-09-09 11:16 ` Angelo Graziosi
2017-09-07 18:58 ` Eli Zaretskii
2017-09-07 19:26 ` Paul Eggert
2017-09-07 19:50 ` Richard Copley
2017-09-07 20:02 ` Richard Copley
2017-09-08 6:49 ` Eli Zaretskii
2017-09-08 8:02 ` Eli Zaretskii
2017-09-08 19:31 ` Richard Copley
2017-09-08 20:17 ` Eli Zaretskii
2017-09-08 21:08 ` Richard Copley
2017-09-08 21:37 ` Richard Copley
2017-09-09 7:37 ` Eli Zaretskii
2017-09-08 22:20 ` Richard Copley
2017-09-09 7:33 ` Eli Zaretskii
2017-09-09 9:36 ` Richard Copley
2017-09-09 10:42 ` Eli Zaretskii
2017-09-09 10:52 ` Eli Zaretskii
2017-09-09 11:17 ` Richard Copley
2017-09-09 16:07 ` Eli Zaretskii
2017-09-10 1:01 ` Richard Copley
2017-09-10 14:40 ` Eli Zaretskii
2017-09-10 19:14 ` Richard Copley
2017-09-10 19:38 ` Angelo Graziosi
2017-09-11 16:17 ` Eli Zaretskii
2017-09-11 22:21 ` Angelo Graziosi
2017-09-11 16:39 ` Óscar Fuentes
2017-09-11 17:20 ` Eli Zaretskii
2017-09-12 17:49 ` Eli Zaretskii
2017-09-12 18:01 ` Fabrice Popineau
2017-09-12 18:37 ` Richard Copley
2017-09-12 18:59 ` Eli Zaretskii
2017-09-12 19:14 ` Richard Copley
2017-09-12 18:38 ` Eli Zaretskii
2017-09-14 17:47 ` Eli Zaretskii
2017-09-14 19:34 ` Richard Copley
2017-09-15 8:54 ` Eli Zaretskii
2017-09-15 23:05 ` Richard Copley
2017-09-16 6:40 ` Eli Zaretskii
2017-09-16 8:19 ` Richard Copley
2017-09-16 8:34 ` Richard Copley
2017-09-16 8:54 ` Eli Zaretskii
2017-09-16 9:07 ` Richard Copley
2017-09-16 11:54 ` Fabrice Popineau
2017-09-16 8:52 ` Eli Zaretskii
2017-09-15 8:59 ` Eli Zaretskii
2017-09-15 14:43 ` Eli Zaretskii
2017-09-17 6:42 ` Paul Eggert
2017-09-17 7:14 ` Richard Copley
2017-09-17 14:31 ` Eli Zaretskii
2017-09-17 6:40 ` Paul Eggert
2017-09-17 14:29 ` Eli Zaretskii
2017-09-17 16:39 ` Fabrice Popineau
2017-09-17 16:52 ` Eli Zaretskii
2017-09-18 0:26 ` Paul Eggert
2017-09-18 11:47 ` Fabrice Popineau
2017-09-18 14:46 ` Eli Zaretskii
2017-09-18 0:01 ` Richard Stallman
2017-09-14 19:36 ` Fabrice Popineau
2017-09-14 21:17 ` Andy Moreton
2017-09-15 6:55 ` Fabrice Popineau
2017-09-15 9:12 ` Eli Zaretskii
2017-09-15 15:33 ` Fabrice Popineau
2017-09-15 15:45 ` Eli Zaretskii
2017-09-15 18:15 ` Fabrice Popineau
2017-09-15 19:00 ` Eli Zaretskii
2017-09-15 21:02 ` Fabrice Popineau
2017-09-16 7:45 ` Eli Zaretskii
2017-09-17 7:01 ` Paul Eggert
2017-09-17 14:31 ` Eli Zaretskii
2017-09-17 14:52 ` Philipp Stephani
2017-09-17 22:34 ` Paul Eggert
2017-09-17 17:07 ` Paul Eggert [this message]
2017-09-17 17:14 ` Eli Zaretskii
2017-09-17 18:53 ` Paul Eggert
2017-09-17 19:30 ` Eli Zaretskii
2017-09-17 20:34 ` Paul Eggert
2017-09-18 2:30 ` Eli Zaretskii
2017-09-18 4:52 ` Paul Eggert
2017-09-18 14:41 ` Eli Zaretskii
2017-09-18 17:35 ` Paul Eggert
2017-09-18 17:58 ` Andy Moreton
2017-09-19 9:05 ` Paul Eggert
2017-09-18 18:01 ` Eli Zaretskii
2017-09-17 20:45 ` Paul Eggert
2017-09-16 13:17 ` Andy Moreton
2017-09-16 13:46 ` Eli Zaretskii
2017-09-16 18:57 ` Richard Copley
2017-09-16 19:21 ` Eli Zaretskii
2017-09-15 9:03 ` Eli Zaretskii
2017-09-09 8:49 ` Angelo Graziosi
2017-09-09 10:37 ` Eli Zaretskii
2017-09-09 11:32 ` Angelo Graziosi
2017-09-09 13:28 ` Eli Zaretskii
2017-09-09 13:33 ` Fabrice Popineau
2017-09-09 14:55 ` Angelo Graziosi
2017-09-09 16:37 ` Eli Zaretskii
2017-09-09 18:38 ` Angelo Graziosi
2017-09-09 18:59 ` Eli Zaretskii
2017-09-09 21:29 ` Angelo Graziosi
2017-09-10 14:56 ` Eli Zaretskii
2017-09-10 15:45 ` Angelo Graziosi
2017-09-10 16:02 ` Eli Zaretskii
2017-09-10 18:45 ` Angelo Graziosi
2017-09-10 19:43 ` Eli Zaretskii
2017-09-09 15:40 ` Angelo Graziosi
2017-09-09 16:40 ` Eli Zaretskii
2017-09-09 18:33 ` Fabrice Popineau
2017-09-07 20:20 ` Eli Zaretskii
2017-09-07 21:59 ` Angelo Graziosi
2017-09-08 8:01 ` Eli Zaretskii
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=0feb1250-beb8-5a21-0582-c879f922bb1c@cs.ucla.edu \
--to=eggert@cs.ucla.edu \
--cc=andrewjmoreton@gmail.com \
--cc=eliz@gnu.org \
--cc=emacs-devel@gnu.org \
--cc=fabrice.popineau@centralesupelec.fr \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.