From: "N. Jackson" <njackson@posteo.net>
To: emacs-devel@gnu.org
Subject: pdumper.c Wstringop-overflow warnings with CFLAGS="-O3" [Re: Emacs 29.2 released]
Date: Fri, 19 Jan 2024 01:40:31 +0000 [thread overview]
Message-ID: <87a5p23xtc.fsf@moondust.localdomain> (raw)
In-Reply-To: <83ttnaaojz.fsf@gnu.org> (Eli Zaretskii's message of "Thu, 18 Jan 2024 13:06:24 +0200")
At 13:06 +0200 on Thursday 2024-01-18, Eli Zaretskii wrote:
>
> Version 29.2 of Emacs, the extensible text editor, should now
> be available
Thank you Eli for your stalwart maintenance of Emacs and to everyone
else who has contributed recently (and, indeed, ever).
Building Emacs 29.2 with CFLAGS="-O3" I get four Wstringop-overflow
warnings in pdumper.c (see below). Can I (as an Emacs user) safely
ignore these warnings? Note: I don't get these warnings with
CFLAGS="-O2".
My version of gcc is:
gcc (GCC) 13.2.1 20231011 (Red Hat 13.2.1-4)
The four warnings are:
In function ‘dump_field_lv_or_rawptr’,
inlined from ‘dump_field_lv_rawptr’ at pdumper.c:1882:3,
inlined from ‘dump_field_finalizer_ref’ at pdumper.c:2205:5,
inlined from ‘dump_field_finalizer_ref’ at pdumper.c:2197:1,
inlined from ‘dump_finalizer’ at pdumper.c:2222:3:
pdumper.c:1863:3: warning: writing 8 bytes into a region of size 0 [-Wstringop-overflow=]
1863 | memcpy (out_field, &out_value, sizeof (out_value));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
and
In function ‘cpyptr’,
inlined from ‘dump_field_emacs_ptr’ at pdumper.c:1967:3,
inlined from ‘dump_field_emacs_ptr’ at pdumper.c:1949:1,
inlined from ‘dump_field_finalizer_ref’ at pdumper.c:2203:5,
inlined from ‘dump_finalizer’ at pdumper.c:2222:3:
pdumper.c:1774:3: warning: writing 8 bytes into a region of size 0 [-Wstringop-overflow=]
1774 | memcpy (out, in, sizeof (void *));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
and
In function ‘cpyptr’,
inlined from ‘dump_field_emacs_ptr’ at pdumper.c:1967:3,
inlined from ‘dump_field_emacs_ptr’ at pdumper.c:1949:1,
inlined from ‘dump_field_finalizer_ref’ at pdumper.c:2203:5,
inlined from ‘dump_finalizer’ at pdumper.c:2223:3:
pdumper.c:1774:3: warning: writing 8 bytes into a region of size 0 [-Wstringop-overflow=]
1774 | memcpy (out, in, sizeof (void *));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
and
In function ‘dump_field_lv_or_rawptr’,
inlined from ‘dump_field_lv_rawptr’ at pdumper.c:1882:3,
inlined from ‘dump_field_finalizer_ref’ at pdumper.c:2205:5,
inlined from ‘dump_field_finalizer_ref’ at pdumper.c:2197:1,
inlined from ‘dump_finalizer’ at pdumper.c:2223:3:
pdumper.c:1863:3: warning: writing 8 bytes into a region of size 0 [-Wstringop-overflow=]
1863 | memcpy (out_field, &out_value, sizeof (out_value));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Thanks.
N.
next prev parent reply other threads:[~2024-01-19 1:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-18 11:06 Emacs 29.2 released Eli Zaretskii
2024-01-18 12:06 ` Po Lu
2024-01-18 12:27 ` Eli Zaretskii
2024-01-18 12:38 ` Po Lu
2024-01-18 13:00 ` Eli Zaretskii
2024-01-20 14:41 ` Eli Zaretskii
2024-01-22 6:20 ` Po Lu
2024-01-23 17:41 ` Eli Zaretskii
2024-01-19 1:40 ` N. Jackson [this message]
2024-01-19 7:23 ` pdumper.c Wstringop-overflow warnings with CFLAGS="-O3" [Re: Emacs 29.2 released] Eli Zaretskii
2024-01-19 21:22 ` Emacs 29.2 released Michael Albinus
2024-01-20 6:51 ` Eli Zaretskii
2024-01-20 8:17 ` Michael Albinus
2024-01-20 9:01 ` Eli Zaretskii
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