Re: [PATCH 06/14] powerpc/vdso: Remove unused '-s' flag from ASFLAGS

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On Mon, Jan 9, 2023 at 2:15 PM Nathan Chancellor <nathan@xxxxxxxxxx> 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@xxxxxxxxxx> 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@xxxxxxxxxx>
>
> 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



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