linux-kernel - Re: Linux 5.16-rc1

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Date:   Sun, 14 Nov 2021 22:33:10 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 5.16-rc1

On 11/14/21 9:21 PM, Linus Torvalds wrote:
> On Sun, Nov 14, 2021 at 8:56 PM Guenter Roeck <linux@...ck-us.net> wrote:
>>
>> With gcc 5.4, mips:mapta_defconfig
>> mips-linux-gcc.br_real: error: unrecognized command line option ‘-Wimplicit-fallthrough=5’
> 
> This (and the gcc-6.x ones for sh4eb/sparc/xtensa) are already fixed
> in my tree. They're all "old gcc didn't support that flag" things with
> a trivial one-liner fix.
> 
> I was hoping you didn't have older gcc versions, but you clearly do ;^p
> 

I have to, for qemu. In some cases the new compilers don't work with
old kernels (eg sparc) and I prefer to use a single compiler for all
kernel versions, in other cases newer versions of gcc have trouble (sheb),
and for xtensa building a compiler that works for a given hardware model
is tricky so I try to avoid it as long as I can.

Guenter