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Re: [RFC (fix for 5.0?)] block/io: do not do pointer arithmetic on void

From: Eric Blake
Subject: Re: [RFC (fix for 5.0?)] block/io: do not do pointer arithmetic on void *
Date: Wed, 18 Mar 2020 09:39:01 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 3/18/20 9:26 AM, Daniel P. Berrangé wrote:
On Wed, Mar 18, 2020 at 05:22:53PM +0300, Vladimir Sementsov-Ogievskiy wrote:
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>

Hi all!

C standard doesn't allow pointer arithmetic on void *.
Still, gcc allows it as an extension:

I can create a series of patches like this. Do we need it?

I don't think so, we only care about gcc & clang.

Still, if all supported compilers support the extension, then our CODING_STYLE.rst should mention that it is safe to rely on the extension.

Also, where is documented which compilers are supported by Qemu?

It is checked in configure - gcc 4.8 or clang 3.4 or xcode clang 5.1

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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