Re: Announce: gcc bogus warning repository

[Jeff Garzik <jeff@garzik.org>]

Randy Dunlap wrote:
> On Sun, 01 Oct 2006 09:44:55 -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
> >
> > This repository will NEVER EVER be pushed upstream.  It exists solely 
> > for those who want to decrease their build noise, thereby exposing true 
> > bugs.
> > The audit has already uncovered several minor bugs, lending credence to 
> > my theory that too many warnings hides bugs.
> I usually build with must_check etc. enabled then grep them
> away if I want to look for other messages.  I think that the situation
> is not so disastrous.
I think it's both sad, and telling, that the high level of build noise 
has trained kernel hackers to tune out warnings, and/or build tools of 
ever-increasing sophistication just to pick out the useful messages from 
all the noise.
If you have to grep useful stuff out of the noise, you've already lost.

	Jeff



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