linux-kernel - Re: [PATCHv1] kbuild: support W=e to make build abort in case of warning

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Message-ID: <CAKwvOd=yNnKsHJo0QWvoTuFF9p-y=cTftTD+7FY-wJ_f23zFTQ@mail.gmail.com>
Date:   Fri, 8 Apr 2022 13:29:16 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Yann Droneaud <ydroneaud@...eya.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCHv1] kbuild: support W=e to make build abort in case of warning

On Fri, Apr 8, 2022 at 4:06 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Fri, Apr 8, 2022 at 5:46 PM Yann Droneaud <ydroneaud@...eya.com> wrote:
> >
> > When developing new code/feature, CONFIG_WERROR is most
> > often turned off, especially for people using make W=12 to
> > get more warnings.
> >
> > In such case, turning on -Werror temporarily would require
> > switching on CONFIG_WERROR in the configuration, building,
> > then switching off CONFIG_WERROR.
> >
> > For this use case, this patch introduces a new 'e' modifier
> > to W= as a short hand for KCFLAGS+=-Werror" so that -Werror
> > got added to the kernel (built-in) and modules' CFLAGS.
> >
> > Signed-off-by: Yann Droneaud <ydroneaud@...eya.com>
> > ---
> >  Makefile                   |  1 +
> >  scripts/Makefile.extrawarn | 13 +++++++++++--
> >  2 files changed, 12 insertions(+), 2 deletions(-)
> >
> > Changes since v0[0]:
> >
> >  - rebase on top of commit 64a91907c896 ("kbuild: refactor scripts/Makefile.extrawarn")
> >  - document use case after commit 3fe617ccafd6 ("Enable '-Werror' by default for all kernel builds")
> >
> > [0] https://lore.kernel.org/all/1422803720-14723-1-git-send-email-ydroneaud@opteya.com/
>
>
> I remembered the previous submission, I liked it, but I had lost it.
>
> It seems already 7 years ago, (before I became the Kbuild maintainer).
> Thanks for coming back to this.
>
>
> I like this, but I will wait some time for review comments.

Dunno, this seems pretty simple:

$ ./scripts/config -e WERROR
$ make ... W=12
-- 
Thanks,
~Nick Desaulniers