From: "Óscar Fuentes" <ofv@wanadoo.es>
To: emacs-devel@gnu.org
Subject: Re: Warnings in mingw64 build on emacs-28 branch
Date: Sun, 07 Nov 2021 20:57:38 +0100 [thread overview]
Message-ID: <87ee7rg2ml.fsf@telefonica.net> (raw)
In-Reply-To: 83y25z7oh6.fsf@gnu.org
Eli Zaretskii <eliz@gnu.org> writes:
>> As for the warning, I think it is because a const void* is passed to
>> VirtualQuery pointing to an uninitialized object.
>
> I don't understand why the compiler thinks the object must be
> initialized for its pointer to be valid. Does the compiler assume
> something about what VirtualQuery does? Why does it think the
> function will dereference the pointer?
The warning says "may be used uninitialized". The compiler doesn't know,
it sees something suspicious and speaks up. That's with -Wall, without
it, the compiler remains silent.
I guess the MinGW headers should be annotated with whatever decoration
gcc uses to convey that the pointer is not dereferenced.
Or we can initialize `m' to zero, which will silence the warning and is
a good practice in general when working with the Windows API.
next prev parent reply other threads:[~2021-11-07 19:57 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-07 14:46 Warnings in mingw64 build on emacs-28 branch Andy Moreton
2021-11-07 15:05 ` Eli Zaretskii
2021-11-07 15:51 ` Óscar Fuentes
2021-11-07 18:39 ` Eli Zaretskii
2021-11-07 19:25 ` Óscar Fuentes
2021-11-07 19:30 ` Eli Zaretskii
2021-11-07 19:57 ` Óscar Fuentes [this message]
2021-11-07 20:02 ` Eli Zaretskii
2021-11-07 18:07 ` Andy Moreton
2021-11-07 19:41 ` Andy Moreton
2021-11-07 19:59 ` Eli Zaretskii
2021-11-07 20:55 ` Andy Moreton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87ee7rg2ml.fsf@telefonica.net \
--to=ofv@wanadoo.es \
--cc=emacs-devel@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.