Re: [MAINTAINERS/KERNEL SUMMIT] Trust and maintenance of file systems

Steven Rostedt
2023-09-07T11:22:32Z

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