From: Segher Boessenkool <segher@kernel.crashing.org>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Nathan Chancellor <nathan@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
kernel test robot <lkp@intel.com>, Arnd Bergmann <arnd@arndb.de>,
Tom Rix <trix@redhat.com>,
"llvm@lists.linux.dev" <llvm@lists.linux.dev>,
Nick Desaulniers <ndesaulniers@google.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Nicholas Piggin <npiggin@gmail.com>,
"patches@lists.linux.dev" <patches@lists.linux.dev>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH] powerpc/math_emu/efp: Include module.h
Date: Fri, 2 Sep 2022 07:40:14 -0500 [thread overview]
Message-ID: <20220902124014.GM25951@gate.crashing.org> (raw)
In-Reply-To: <ae2ee2d8-ec0a-d0ab-2c5a-b9a8c7579093@csgroup.eu>
On Fri, Sep 02, 2022 at 08:43:49AM +0000, Christophe Leroy wrote:
> Le 01/09/2022 à 21:47, Segher Boessenkool a écrit :
> > On Thu, Sep 01, 2022 at 05:41:33AM +0000, Christophe Leroy wrote:
> >> I think it would be worth a GCC bug report.
> >
> > We need a stand-alone testcase for this. When you have created one, at
> > least 98% of the time you discover the bug is in user code after all.
> >
> > Which is a very good thing, it means the problem can be fixed simpler,
> > cheaper, and a lot faster :-)
>
> Easy to reproduce with a .c file that has a single line:
>
> non_existing_macro(xxx);
That was fast (and cheap and simple) :-)
> Apparently that's due to the -w option in arch/powerpc/math_emu/Makefile:
>
> ccflags-y = -w
>
> Was introduced by commit d2b194ed8208 ("powerpc/math-emu: Use kernel
> generic math-emu code")
>
> If I understand correctly it means 'ignore all warnings'. Then it seems
> CLANG doesn't honor that request.
'-w'
Inhibit all warning messages.
GCC's initial commit has this already (1992).
Segher
WARNING: multiple messages have this Message-ID (diff)
From: Segher Boessenkool <segher@kernel.crashing.org>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: kernel test robot <lkp@intel.com>, Arnd Bergmann <arnd@arndb.de>,
"llvm@lists.linux.dev" <llvm@lists.linux.dev>,
Nick Desaulniers <ndesaulniers@google.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Nicholas Piggin <npiggin@gmail.com>,
"patches@lists.linux.dev" <patches@lists.linux.dev>,
Nathan Chancellor <nathan@kernel.org>, Tom Rix <trix@redhat.com>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH] powerpc/math_emu/efp: Include module.h
Date: Fri, 2 Sep 2022 07:40:14 -0500 [thread overview]
Message-ID: <20220902124014.GM25951@gate.crashing.org> (raw)
In-Reply-To: <ae2ee2d8-ec0a-d0ab-2c5a-b9a8c7579093@csgroup.eu>
On Fri, Sep 02, 2022 at 08:43:49AM +0000, Christophe Leroy wrote:
> Le 01/09/2022 à 21:47, Segher Boessenkool a écrit :
> > On Thu, Sep 01, 2022 at 05:41:33AM +0000, Christophe Leroy wrote:
> >> I think it would be worth a GCC bug report.
> >
> > We need a stand-alone testcase for this. When you have created one, at
> > least 98% of the time you discover the bug is in user code after all.
> >
> > Which is a very good thing, it means the problem can be fixed simpler,
> > cheaper, and a lot faster :-)
>
> Easy to reproduce with a .c file that has a single line:
>
> non_existing_macro(xxx);
That was fast (and cheap and simple) :-)
> Apparently that's due to the -w option in arch/powerpc/math_emu/Makefile:
>
> ccflags-y = -w
>
> Was introduced by commit d2b194ed8208 ("powerpc/math-emu: Use kernel
> generic math-emu code")
>
> If I understand correctly it means 'ignore all warnings'. Then it seems
> CLANG doesn't honor that request.
'-w'
Inhibit all warning messages.
GCC's initial commit has this already (1992).
Segher
next prev parent reply other threads:[~2022-09-02 12:46 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-31 15:20 [PATCH] powerpc/math_emu/efp: Include module.h Nathan Chancellor
2022-08-31 15:20 ` Nathan Chancellor
2022-09-01 5:41 ` Christophe Leroy
2022-09-01 5:41 ` Christophe Leroy
2022-09-01 19:47 ` Segher Boessenkool
2022-09-01 19:47 ` Segher Boessenkool
2022-09-02 8:43 ` Christophe Leroy
2022-09-02 8:43 ` Christophe Leroy
2022-09-02 12:40 ` Segher Boessenkool [this message]
2022-09-02 12:40 ` Segher Boessenkool
2022-09-09 12:06 ` Michael Ellerman
2022-09-09 12:06 ` Michael Ellerman
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