From: Segher Boessenkool <segher@kernel.crashing.org>
To: Nathan Chancellor <natechancellor@gmail.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
LKML <linux-kernel@vger.kernel.org>,
"# 3.4.x" <stable@vger.kernel.org>,
clang-built-linux <clang-built-linux@googlegroups.com>,
David Laight <David.Laight@aculab.com>,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH] powerpc: Avoid clang warnings around setjmp and longjmp
Date: Tue, 3 Sep 2019 14:31:28 -0500 [thread overview]
Message-ID: <20190903193128.GC9749@gate.crashing.org> (raw)
In-Reply-To: <20190903055553.GC60296@archlinux-threadripper>
On Mon, Sep 02, 2019 at 10:55:53PM -0700, Nathan Chancellor wrote:
> 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.
Since setjmp can return more than once, yes, exciting things can happen
if you do not tell the compiler about this.
Segher
WARNING: multiple messages have this Message-ID (diff)
From: Segher Boessenkool <segher@kernel.crashing.org>
To: Nathan Chancellor <natechancellor@gmail.com>
Cc: David Laight <David.Laight@aculab.com>,
Nick Desaulniers <ndesaulniers@google.com>,
LKML <linux-kernel@vger.kernel.org>,
"# 3.4.x" <stable@vger.kernel.org>,
clang-built-linux <clang-built-linux@googlegroups.com>,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH] powerpc: Avoid clang warnings around setjmp and longjmp
Date: Tue, 3 Sep 2019 14:31:28 -0500 [thread overview]
Message-ID: <20190903193128.GC9749@gate.crashing.org> (raw)
In-Reply-To: <20190903055553.GC60296@archlinux-threadripper>
On Mon, Sep 02, 2019 at 10:55:53PM -0700, Nathan Chancellor wrote:
> 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.
Since setjmp can return more than once, yes, exciting things can happen
if you do not tell the compiler about this.
Segher
next prev parent reply other threads:[~2019-09-03 19:33 UTC|newest]
Thread overview: 37+ 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 2:32 ` Nathan Chancellor
2019-08-12 5:37 ` Christophe Leroy
2019-08-12 16:55 ` Nathan Chancellor
2019-08-12 16:55 ` Nathan Chancellor
2019-08-12 17:35 ` Nick Desaulniers
2019-08-12 17:35 ` Nick Desaulniers
2019-08-27 0:12 ` Nathan Chancellor
2019-08-27 0:12 ` Nathan Chancellor
2019-08-28 13:43 ` Michael Ellerman
2019-08-28 13:43 ` Michael Ellerman
2019-08-28 17:53 ` Nathan Chancellor
2019-08-28 17:53 ` Nathan Chancellor
2019-08-28 18:01 ` Nick Desaulniers
2019-08-28 18:01 ` Nick Desaulniers
2019-08-28 18:45 ` Nathan Chancellor
2019-08-28 18:45 ` Nathan Chancellor
2019-08-28 22:16 ` Nick Desaulniers
2019-08-28 22:16 ` Nick Desaulniers
2019-08-29 8:32 ` Segher Boessenkool
2019-08-29 8:32 ` Segher Boessenkool
2019-08-29 9:59 ` David Laight
2019-09-03 5:55 ` Nathan Chancellor
2019-09-03 5:55 ` Nathan Chancellor
2019-09-03 19:31 ` Segher Boessenkool [this message]
2019-09-03 19:31 ` Segher Boessenkool
2019-09-04 0:24 ` Nathan Chancellor
2019-09-04 0:24 ` Nathan Chancellor
2019-09-04 8:16 ` David Laight
2019-09-04 13:01 ` Segher Boessenkool
2019-09-04 13:01 ` Segher Boessenkool
2019-09-04 23:15 ` Nathan Chancellor
2019-09-04 23:15 ` Nathan Chancellor
2019-09-10 18:30 ` Michael Ellerman
2019-09-10 18:30 ` Michael Ellerman
2019-09-10 18:37 ` Nathan Chancellor
2019-09-10 18:37 ` Nathan Chancellor
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