From: Nick Desaulniers <ndesaulniers@google.com>
To: Nathan Chancellor <nathan@kernel.org>
Cc: masahiroy@kernel.org, nicolas@fjasle.eu, trix@redhat.com,
linux-kbuild@vger.kernel.org, llvm@lists.linux.dev,
kernel test robot <lkp@intel.com>,
mpe@ellerman.id.au, npiggin@gmail.com,
christophe.leroy@csgroup.eu, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 06/14] powerpc/vdso: Remove unused '-s' flag from ASFLAGS
Date: Mon, 9 Jan 2023 14:21:46 -0800 [thread overview]
Message-ID: <CAKwvOdn5Wmi+b7x9DniE0=aCqFfLFwusAi2Ny-bfMNfncp5dUg@mail.gmail.com> (raw)
In-Reply-To: <Y7yR65TeqQXU/4nS@dev-arch.thelio-3990X>
On Mon, Jan 9, 2023 at 2:15 PM Nathan Chancellor <nathan@kernel.org> wrote:
>
> On Mon, Jan 09, 2023 at 01:58:32PM -0800, Nick Desaulniers wrote:
> > On Wed, Jan 4, 2023 at 11:55 AM Nathan Chancellor <nathan@kernel.org> wrote:
> > >
> > > When clang's -Qunused-arguments is dropped from KBUILD_CPPFLAGS, it
> > > warns that ASFLAGS contains '-s', which is a linking phase option, so it
> > > is unused.
> > >
> > > clang-16: error: argument unused during compilation: '-s' [-Werror,-Wunused-command-line-argument]
> > >
> > > Looking at the GAS sources, '-s' is only useful when targeting Solaris
> > > and it is ignored for the powerpc target so just drop the flag
> > > altogether, as it is not needed.
> >
> > Do you have any more info where you found this? I don't see -s
> > documented as an assembler flag.
> > https://sourceware.org/binutils/docs/as/PowerPC_002dOpts.html
> > https://sourceware.org/binutils/docs/as/Invoking.html
>
> Sure thing, sorry I did not include it initially. See the section from
> line 1284 to 1291 or search for "case 's':":
>
> https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gas/config/tc-ppc.c;h=9450fa74de1b61542c9a18babf8c8f621ef904fb;hb=HEAD
>
> > The patch seems fine to me, but what was this ever supposed to be?
> > FWICT it predates git history (looking at
> > arch/powerpc/kernel/vdso32/Makefile at fc15351d9d63)
>
> Right, I could not figure it out either, it has been there since the
> vDSO was introduced back in 2005 (I was three days away from 10!) and
> there is no comment about it so *shrug*:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/?id=054eb7153aeb84cc92da84210cf93b0e2a34811b
>
> If someone else's archeological skills are better and can provide more
> information, I am happy to include that.
>
> > Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
>
> Thanks as always for the review! I'll include this and a note about
> where in binutils I found that information for v2.
Yeah, I think the comment from binutils sources would be good to add
to a v2 commit message. Thanks!
--
Thanks,
~Nick Desaulniers
next prev parent reply other threads:[~2023-01-09 22:21 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-04 19:54 [PATCH 00/14] Remove clang's -Qunused-arguments from KBUILD_CPPFLAGS Nathan Chancellor
2023-01-04 19:54 ` [PATCH 01/14] x86/boot/compressed: prefer cc-option for CFLAGS additions Nathan Chancellor
2023-01-04 19:54 ` [PATCH 02/14] MIPS: Always use -Wa,-msoft-float and eliminate GAS_HAS_SET_HARDFLOAT Nathan Chancellor
2023-01-09 21:18 ` Nick Desaulniers
2023-01-10 7:45 ` Philippe Mathieu-Daudé
2023-01-10 8:30 ` Thomas Bogendoerfer
2023-01-04 19:54 ` [PATCH 03/14] MIPS: Prefer cc-option for additions to cflags Nathan Chancellor
2023-01-09 21:21 ` Nick Desaulniers
2023-01-10 7:42 ` Philippe Mathieu-Daudé
2023-01-10 8:30 ` Thomas Bogendoerfer
2023-01-04 19:54 ` [PATCH 04/14] kbuild: Update assembler calls to use proper flags and language target Nathan Chancellor
2023-01-04 19:54 ` [PATCH 05/14] powerpc: Remove linker flag from KBUILD_AFLAGS Nathan Chancellor
2023-01-09 21:24 ` Nick Desaulniers
2023-01-04 19:54 ` [PATCH 06/14] powerpc/vdso: Remove unused '-s' flag from ASFLAGS Nathan Chancellor
2023-01-09 21:58 ` Nick Desaulniers
2023-01-09 22:15 ` Nathan Chancellor
2023-01-09 22:21 ` Nick Desaulniers [this message]
2023-01-09 22:23 ` Segher Boessenkool
2023-01-09 22:37 ` Nathan Chancellor
2023-01-09 22:47 ` Segher Boessenkool
2023-01-09 23:14 ` Nick Desaulniers
2023-01-10 0:51 ` Nathan Chancellor
2023-01-10 11:45 ` Segher Boessenkool
2023-01-10 15:02 ` Nathan Chancellor
[not found] ` <20230109222337.GM25951__25255.3859770828$1673303520$gmane$org@gate.crashing.org>
2023-01-10 0:22 ` Andreas Schwab
2023-01-10 0:43 ` Segher Boessenkool
2023-01-04 19:54 ` [PATCH 07/14] powerpc/vdso: Improve linker flags Nathan Chancellor
2023-01-09 22:08 ` Nick Desaulniers
2023-01-09 22:15 ` Nathan Chancellor
2023-01-04 19:54 ` [PATCH 08/14] powerpc/vdso: Remove an unsupported flag from vgettimeofday-32.o with clang Nathan Chancellor
2023-01-09 22:12 ` Nick Desaulniers
2023-01-09 22:38 ` Nathan Chancellor
2023-01-09 23:16 ` Nick Desaulniers
2023-01-04 19:54 ` [PATCH 09/14] s390/vdso: Drop unused '-s' flag from KBUILD_AFLAGS_64 Nathan Chancellor
2023-01-05 7:27 ` Sven Schnelle
2023-01-04 19:54 ` [PATCH 10/14] s390/vdso: Drop '-shared' from KBUILD_CFLAGS_64 Nathan Chancellor
2023-01-05 7:31 ` Sven Schnelle
2023-01-04 19:54 ` [PATCH 11/14] s390/purgatory: Remove unused '-MD' and unnecessary '-c' flags Nathan Chancellor
2023-01-05 7:33 ` Sven Schnelle
2023-01-04 19:54 ` [PATCH 12/14] drm/amd/display: Do not add '-mhard-float' to dml_ccflags for clang Nathan Chancellor
2023-01-05 14:21 ` Alex Deucher
2023-01-04 19:54 ` [PATCH 13/14] kbuild: Turn a couple more of clang's unused option warnings into errors Nathan Chancellor
2023-01-09 22:15 ` Nick Desaulniers
2023-01-04 19:54 ` [PATCH 14/14] kbuild: Stop using '-Qunused-arguments' with clang Nathan Chancellor
2023-01-09 22:17 ` Nick Desaulniers
2023-01-05 8:00 ` [PATCH 00/14] Remove clang's -Qunused-arguments from KBUILD_CPPFLAGS Heiko Carstens
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