From: Eli Zaretskii <eliz@gnu.org>
To: Philipp Stephani <p.stephani2@gmail.com>
Cc: 32189@debbugs.gnu.org
Subject: bug#32189: 27.0.50; GCC 7 warning due to -Wformat-truncation=2
Date: Thu, 19 Jul 2018 16:25:09 +0300 [thread overview]
Message-ID: <83k1pr2w96.fsf@gnu.org> (raw)
In-Reply-To: <CAArVCkTXa6kY3KqwaWGdNV=T7UerxJOV5arB1Foc77JnPUprbQ@mail.gmail.com> (message from Philipp Stephani on Thu, 19 Jul 2018 08:10:20 +0200)
> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Thu, 19 Jul 2018 08:10:20 +0200
> Cc: Eli Zaretskii <eliz@gnu.org>, 32189@debbugs.gnu.org
>
> This doesn't work with GCC 7. (Maybe it would work with GCC 8; the
> release notes say that it is better at avoiding false positives.) For
> integer specifiers like "%ld", the only thing I've found that works
> without enlarging the buffer is to cast the argument to a smaller
> integer type.
>
> You can't do that; %ld requires a long argument, and casting results in undefined behavior.
We can assign instead, and since the value is known to be small
enough, doing that won't lose bits.
next prev parent reply other threads:[~2018-07-19 13:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-17 19:26 bug#32189: 27.0.50; GCC 7 warning due to -Wformat-truncation=2 Ken Brown
2018-07-18 15:09 ` Eli Zaretskii
2018-07-18 19:42 ` Ken Brown
2018-07-19 2:38 ` Eli Zaretskii
2018-07-19 6:10 ` Philipp Stephani
2018-07-19 12:49 ` Ken Brown
2018-07-19 13:25 ` Eli Zaretskii [this message]
2018-07-19 6:21 ` Philipp Stephani
2018-07-19 13:29 ` Eli Zaretskii
2018-07-19 13:56 ` Ken Brown
2018-07-19 14:17 ` Eli Zaretskii
2018-07-19 23:19 ` Paul Eggert
2018-07-20 6:56 ` Eli Zaretskii
2018-07-20 13:49 ` Ken Brown
2018-07-20 14:17 ` Eli Zaretskii
2018-07-20 14:27 ` Ken Brown
2018-07-20 14:37 ` Paul Eggert
2018-07-20 14:51 ` Eli Zaretskii
2018-07-20 19:34 ` Ken Brown
2018-07-20 21:03 ` Paul Eggert
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