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Date: Thu, 7 Sep 2023 07:22:45 -0400
From: Steven Rostedt <rostedt@goodmis.org>
To: Segher Boessenkool <segher@kernel.crashing.org>
Cc: Dan Carpenter <dan.carpenter@linaro.org>, Dave Chinner
 <david@fromorbit.com>, Guenter Roeck <linux@roeck-us.net>, Christoph
 Hellwig <hch@infradead.org>, ksummit@lists.linux.dev,
 linux-fsdevel@vger.kernel.org, gcc-patches@gcc.gnu.org
Subject: Re: [MAINTAINERS/KERNEL SUMMIT] Trust and maintenance of file
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On Thu, 7 Sep 2023 06:04:09 -0500
Segher Boessenkool <segher@kernel.crashing.org> wrote:

> On Thu, Sep 07, 2023 at 12:48:25PM +0300, Dan Carpenter via Gcc-patches wrote:
> > I started to hunt
> > down all the Makefile which add a -Werror but there are a lot and
> > eventually I got bored and gave up.  
> 
> I have a patch stack for that, since 2014 or so.  I build Linux with
> unreleased GCC versions all the time, so pretty much any new warning is
> fatal if you unwisely use -Werror.
> 
> > Someone should patch GCC so there it checks an environment variable to
> > ignore -Werror.  Somethine like this?  
> 
> No.  You should patch your program, instead.  One easy way is to add a
> -Wno-error at the end of your command lines.  Or even just -w if you
> want or need a bigger hammer.

That's not really possible when bisecting a kernel bug into older kernels.
The build system is highly complex and requires hundreds of changes to do
what you suggested. As it is for a bisection that takes a minimum of 13
iterations, your approach just isn't feasible.

-- Steve