linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Sasha Levin <sasha.levin@oracle.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [PATCH] kernel: use the gnu89 standard explicitly
Date: Sun, 19 Oct 2014 19:52:17 -0400	[thread overview]
Message-ID: <54444EB1.5010301@oracle.com> (raw)
In-Reply-To: <CA+55aFyDECoy4s6oO=PFZSyNS_F9EagxFiNm1X95Fu0cdSTeXQ@mail.gmail.com>

On 10/19/2014 04:05 PM, Linus Torvalds wrote:
> On Sun, Oct 19, 2014 at 9:07 AM, Sasha Levin <sasha.levin@oracle.com> wrote:
>> > gcc5 changes the default standard to c11, rather than gnu89, which
>> > makes kernel build unhappy.
> Hmm. Just how unhappy does it make it? Maybe we can instead try to
> make the build happier with some minimal changes? Or is it really
> painful?

The build breakage is easy to fix. I'm worried about the stuff that won't show
upon build. Different behaviours that go unnoticed and maybe issues inside
gcc's code generation that weren't uncovered until now.

Also, unless we specify exactly what standard we want what would happen is that
a significantly different C standard would be used depending on the compiler
version. It is already the case with clang but putting in a 3rd one in the
mix is too much IMO.

I'll send a few other patches to make it at least compile under c11, but I still
think that we should plug this hole by sticking with gnu89 for now.

Thanks,
Sasha

  parent reply	other threads:[~2014-10-19 23:52 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-19 16:07 [PATCH] kernel: use the gnu89 standard explicitly Sasha Levin
2014-10-19 20:05 ` Linus Torvalds
2014-10-19 20:23   ` Joe Perches
     [not found]     ` <CA+55aFwbq4TtQXC9PTjOF3UPP7u8XH1mSYjvT7pevKcQBfy25A@mail.gmail.com>
2014-10-19 21:31       ` Joe Perches
2014-10-19 21:03   ` Aaro Koskinen
2014-10-19 23:05     ` Linus Torvalds
2014-10-19 23:10       ` Kirill A. Shutemov
2014-10-19 23:19         ` Al Viro
2014-10-19 23:21         ` Kirill A. Shutemov
2014-10-19 23:26           ` Al Viro
2014-10-19 23:49         ` Linus Torvalds
2014-10-19 23:59           ` Sasha Levin
2014-10-20  0:23             ` Linus Torvalds
2014-10-20  4:16               ` Al Viro
2014-10-19 23:25       ` pinskia
2014-10-19 23:52   ` Sasha Levin [this message]
2014-10-19 22:29 ` Kirill A. Shutemov

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=54444EB1.5010301@oracle.com \
    --to=sasha.levin@oracle.com \
    --cc=akpm@linux-foundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=torvalds@linux-foundation.org \
    --cc=viro@ZenIV.linux.org.uk \
    /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. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).