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warnings compiling emacs28 with gcc 12.1
From: |
Jose A. Ortega Ruiz |
Subject: |
warnings compiling emacs28 with gcc 12.1 |
Date: |
Thu, 28 Jul 2022 04:32:39 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
Hi,
I'm sending this email to devel because i'm not sure this is to be
considered a bug.
I compiled today the emacs28 branch with gcc version
'gcc (Debian 12.1.0-7) 12.1.0' and configured with
./configure --with-x-toolkit=no
and i am seeing several new (to me) compilation warnings.
Some of them are about possible uses of null pointers, like this one:
In file included from intervals.c:45:
intervals.c: In function ‘graft_intervals_into_buffer’:
intervals.h:101:29: warning: potential null pointer dereference
[-Wnull-dereference]
101 | #define TOTAL_LENGTH(i) ((i)->total_length)
| ~~~~^~~~~~~~~~~~~~~
and there's another one about free that looks a bit scary:
alloc.c: In function ‘lisp_free’:
alloc.c:1052:3: warning: pointer ‘block’ used after ‘free’ [-Wuse-after-free]
1052 | mem_delete (mem_find (block));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
alloc.c:1050:3: note: call to ‘free’ here
1050 | free (block);
| ^~~~~~~~~~~~
There are also several out-of-bounds access in xdisp.c that look like
this one:
xdisp.c: In function ‘append_space_for_newline’:
xdisp.c:22011:7: warning: ‘memset’ offset [2352, 2359] from the object at
‘it’ is out of the bounds of referenced subobject ‘charpos’ with type ‘long
int’ at offset 2344 [-Warray-bounds]
22011 | memset (&it->position, 0, sizeof it->position);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from composite.h:29,
from xdisp.c:441:
dispextern.h:214:13: note: subobject ‘charpos’ declared here
214 | ptrdiff_t charpos;
| ^~~~~~~
And so on. I guess the whole list is easily reproducible by anyone
compiling git gcc 12.1 in a GNU/Linux system, so i'm not sending it in
full. I can do that in a bug report if you think it's needed.
Apologies if all this is already well-known/spurious.
Thanks,
jao
--
A lot of people have my books on their bookshelves.
That's the problem, they need to read them. - Don Knuth
- warnings compiling emacs28 with gcc 12.1,
Jose A. Ortega Ruiz <=