linux-kernel - Re: Announce: gcc bogus warning repository

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Date:	Sun, 1 Oct 2006 11:12:26 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Jeff Garzik <jeff@...zik.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Announce: gcc bogus warning repository

On Sun, 01 Oct 2006 08:40:13 -0700
Daniel Walker <dwalker@...sta.com> wrote:

> On Sun, 2006-10-01 at 09:44 -0400, Jeff Garzik wrote:
> > The level of warnings in a kernel build has lately increased to the 
> > point where it is hiding bugs and otherwise making life difficult.
> > 
> > In particular, recent gcc versions throw warnings when it thinks a 
> > variable "MAY be used uninitialized", which is not terribly helpful due 
> > to the fact that most of these warnings are bogus.
> > 
> > For those that may find this valuable, I have started a git repo that 
> > silences these bogus warnings, after careful auditing of code paths to 
> > ensure that the warning truly is bogus.
> > 
> > The results may be found in the "gccbug" branch of
> > git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/misc-2.6.git
> > 

Funny - I started doing the exact same thing here just eight hours ago. 
I'll send you anything which isn't in that git tree, thanks.

> Steven Rostedt an I worked on this problem in May. Steven came up with,
> a nice way to handle these warnings, which doesn't increase code size.
> Here's the post if your interested.
> 
> http://lkml.org/lkml/2006/5/11/50

I think we should merge that and use it.  No overhead, self-documenting,
easily greppable for.

The downsides are that it muckies up the source a little and introduces a
very small risk that real use-uninitialised bugs will be hidden.  But I
believe the benefit outweighs those disadvantages.
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