From: Nathan Chancellor <natechancellor@gmail.com>
To: David Laight <David.Laight@aculab.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
LKML <linux-kernel@vger.kernel.org>,
clang-built-linux <clang-built-linux@googlegroups.com>,
"# 3.4.x" <stable@vger.kernel.org>
Subject: Re: [PATCH] powerpc: Avoid clang warnings around setjmp and longjmp
Date: Mon, 2 Sep 2019 22:55:53 -0700 [thread overview]
Message-ID: <20190903055553.GC60296@archlinux-threadripper> (raw)
In-Reply-To: <6801a83ed6d54d95b87a41c57ef6e6b0@AcuMS.aculab.com>
On Thu, Aug 29, 2019 at 09:59:48AM +0000, David Laight wrote:
> From: Nathan Chancellor
> > Sent: 28 August 2019 19:45
> ...
> > However, I think that -fno-builtin-* would be appropriate here because
> > we are providing our own setjmp implementation, meaning clang should not
> > be trying to do anything with the builtin implementation like building a
> > declaration for it.
>
> Isn't implementing setjmp impossible unless you tell the compiler that
> you function is 'setjmp-like' ?
No idea, PowerPC is the only architecture that does such a thing.
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/tree/arch/powerpc/kernel/misc.S#n43
Goes back all the way to before git history (all the way to ppc64's
addition actually):
https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/?id=61542216fa90397a2e70c46583edf26bc81994df
https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/arch/ppc64/xmon/setjmp.c?id=5f12b0bff93831620218e8ed3970903ecb7861ce
I would just like this warning fixed given that PowerPC builds with
-Werror by default so it is causing a build failure in our CI.
Cheers,
Nathan
next prev parent reply other threads:[~2019-09-03 5:55 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-12 2:32 [PATCH] powerpc: Avoid clang warnings around setjmp and longjmp Nathan Chancellor
2019-08-12 5:37 ` Christophe Leroy
2019-08-12 16:55 ` Nathan Chancellor
2019-08-12 17:35 ` Nick Desaulniers
2019-08-27 0:12 ` Nathan Chancellor
2019-08-28 13:43 ` Michael Ellerman
2019-08-28 17:53 ` Nathan Chancellor
2019-08-28 18:01 ` Nick Desaulniers
2019-08-28 18:45 ` Nathan Chancellor
2019-08-28 22:16 ` Nick Desaulniers
2019-08-29 8:32 ` Segher Boessenkool
[not found] ` <6801a83ed6d54d95b87a41c57ef6e6b0@AcuMS.aculab.com>
2019-09-03 5:55 ` Nathan Chancellor [this message]
2019-09-03 19:31 ` Segher Boessenkool
2019-09-04 0:24 ` Nathan Chancellor
[not found] ` <1bcd7086f3d24dfa82eec03980f30fbc@AcuMS.aculab.com>
2019-09-04 13:01 ` Segher Boessenkool
2019-09-04 23:15 ` Nathan Chancellor
2019-09-10 18:30 ` Michael Ellerman
2019-09-10 18:37 ` Nathan Chancellor
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