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Re: warnings compiling emacs28 with gcc 12.1
From: |
Óscar Fuentes |
Subject: |
Re: warnings compiling emacs28 with gcc 12.1 |
Date: |
Thu, 28 Jul 2022 19:12:00 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
Eli Zaretskii <eliz@gnu.org> writes:
>> 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);
>> | ^~~~~~~~~~~~
>
> Another nonsense. Look in mem_find, and you will see that it uses its
> argument as just a number, it never dereferences it.
The warning is not about dereferencing the pointer.