linux-kernel - Re: [GIT PULL] Wimplicit-fallthrough patches for 5.3-rc2

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Date:   Tue, 30 Jul 2019 17:43:55 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] Wimplicit-fallthrough patches for 5.3-rc2

Kalle Valo <kvalo@...eaurora.org> writes:

> "Gustavo A. R. Silva" <gustavo@...eddedor.com> writes:
>
>> On 7/27/19 1:08 PM, Linus Torvalds wrote:
>>
>>> 
>>> Ok, I have tried re-pulling and if it passes my build tests cleanly
>>> I'll push the result out.
>>> 
>>
>> Awesome. :)
>
> BTW, now when using ccache 3.2.4 (which I admit is an old release from
> 2015 but included still in Ubuntu 16.04) I see a lot of fall-through
> warnings when building the kernel. I reported this to Gustavo before but
> didn't find the time to answer back to his extra questions, sorry about
> that.
>
> I did investigate the issue at the time and IIRC it was because ccache
> strips away the comments (including the fallback comments) before
> feeding the source file to the compiler. Apparently newer ccache
> versions has a setting to avoid that but I have not tried upgrading yet.
> But anyone using old ccache should definitely upgrade.

I just installed ccache 3.4.1-1 from Ubuntu 18.04 and that seemed to fix
the problem, the big number of fallthrough warnings are now gone. No
extra configuration needed.

-- 
Kalle Valo