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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.

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