GNU bug report logs - #55895
[PATCH] maint: Fix ptr_align signature to silence -Wmaybe-uninitialized

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Package: coreutils;

Reported by: Anders Kaseorg <andersk <at> mit.edu>

Date: Fri, 10 Jun 2022 22:31:02 UTC

Severity: normal

Tags: patch

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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Message #22 received at 55895 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Anders Kaseorg <andersk <at> mit.edu>
Cc: 55895 <at> debbugs.gnu.org
Subject: Re: bug#55895: [PATCH] maint: Fix ptr_align signature to silence
 -Wmaybe-uninitialized
Date: Sat, 11 Jun 2022 10:13:19 -0700

On 6/11/22 09:30, Anders Kaseorg wrote:
> A pointer to uninitialized (or zero-initialized) memory that won’t be 
> written is valid but not _useful_.

But in the example I gave, the memory *is* written to later.

A const * pointer lets a C program have a read-only window into memory 
that other parts of the program can write to, which can be a useful 
thing to have. In C and C++, "const *" doesn't mean a pointer to storage 
that does not change; it merely means a pointer that can't be used to 
write the referenced storage.
This bug report was last modified 2 years and 341 days ago.

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