Re: [PATCH] avoid -Wuse-after-free [BZ #26779]

[Florian Weimer <fweimer@redhat.com>]

* Martin Sebor via Libc-alpha:

> GCC 12 features a couple of new warnings designed to detect uses
> of pointers made invalid by the pointees lifetimes having ended.
> Building Glibc with the enhanced GCC exposes a few such uses,
> mostly after successful calls to realloc.  The attached patch
> avoids the new warnings by converting the pointers to uintptr_t
> first and using the converted integers instead.
>
> The patch suppresses all instances of the warning at the strictest
> setting (-Wuse-after-free=3), which includes even uses in equality
> expressions.  The default setting approved for GCC 12 is
> -Wuse-after-free=2, which doesn't warn on such uses to accommodate
> the pointer-adjustment-after-realloc idiom.  At the default setting,
> the changes to ldconfig.c and setenv are not necessary.

Would you be able to split up this patch further?  It will help with
eventually backporting parts of it.

Thanks,
Florian