linux-kernel - Re: [PATCH 1/2] kbuild: refactor scripts/Makefile.extrawarn

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Date:   Wed, 28 Aug 2019 11:26:08 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Michal Marek <michal.lkml@...kovi.net>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] kbuild: refactor scripts/Makefile.extrawarn

On Wed, Aug 28, 2019 at 12:20 AM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> On Wed, Aug 28, 2019 at 7:55 AM Masahiro Yamada
> <yamada.masahiro@...ionext.com> wrote:
> >
> > Instead of the warning-[123] magic, let's accumulate compiler options
> > to KBUILD_CFLAGS directly as the top Makefile does. I think this makes
> > easier to understand what is going on in this file.
> >
> > This commit slightly changes the behavior, I think all of which are OK.
> >
> > [1] Currently, cc-option calls are needlessly evaluated. For example,
> >       warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
> >     needs evaluating only when W=3, but it is actually evaluated for
> >     W=1, W=2 as well. With this commit, only relevant cc-option calls
> >     will be evaluated. This is a slight optimization.
> >
> > [2] Currently, unsupported level like W=4 is checked by:
> >       $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
> >     This will no longer be checked, but I do not think it is a big
> >     deal.
> >
>
> Hi Masahiro Yamada,
>
> thanks for your patch series.
>
> If KBUILD_ENABLE_EXTRA_GCC_CHECKS does extra(-warning)-checks for GCC and Clang,
> please rename the Kconfig into...
>
> KBUILD_ENABLE_EXTRA_CC_CHECKS
>
> ...or something similiar (and maybe with some notes in its Kconfig help-text?).

I too would like to see that changed.

-- 
Thanks,
~Nick Desaulniers