linux-kernel - Re: Error: invalid switch -me200

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Date:   Tue, 17 Nov 2020 10:29:29 +1030
From:   Alan Modra <amodra@...il.com>
To:     Segher Boessenkool <segher@...nel.crashing.org>
Cc:     Fāng-ruì Sòng <maskray@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Brian Cain <bcain@...eaurora.org>,
        kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Subject: Re: Error: invalid switch -me200

On Fri, Nov 13, 2020 at 06:50:15PM -0600, Segher Boessenkool wrote:
> On Fri, Nov 13, 2020 at 04:37:38PM -0800, Fāng-ruì Sòng wrote:
> > On Fri, Nov 13, 2020 at 4:23 PM Segher Boessenkool
> > <segher@...nel.crashing.org> wrote:
> > > On Fri, Nov 13, 2020 at 12:14:18PM -0800, Nick Desaulniers wrote:
> > > > > > > Error: invalid switch -me200
> > > > > > > Error: unrecognized option -me200
> > > > > >
> > > > > > 251 cpu-as-$(CONFIG_E200)   += -Wa,-me200
> > > > > >
> > > > > > Are those all broken configs, or is Kconfig messed up such that
> > > > > > randconfig can select these when it should not?
> > > > >
> > > > > Hmmm, looks like this flag does not exist in mainline binutils? There is
> > > > > a thread in 2010 about this that Segher commented on:
> > > > >
> > > > > https://lore.kernel.org/linuxppc-dev/9859E645-954D-4D07-8003-FFCD2391AB6E@kernel.crashing.org/
> > > > >
> > > > > Guess this config should be eliminated?
> > >
> > > The help text for this config options says that e200 is used in 55xx,
> > > and there *is* an -me5500 GAS flag (which probably does this same
> > > thing, too).  But is any of this tested, or useful, or wanted?
> > >
> > > Maybe Christophe knows, cc:ed.
> > 
> > CC Alan Modra, a binutils global maintainer.
> > 
> > Alan, can the few -Wa,-m* options deleted from arch/powerpc/Makefile ?
> 
> All the others work fine (and are needed afaics), it is only -me200 that
> doesn't exist (in mainline binutils).

Right, and a quick check says it never existed.  There is e200z4,
added to binutils with dfdaec14b0d, 2016-08-01, but the kernel -me200
was added in 2005.  I suspect the toolchain support only existed
inside Freescale and pushing it upstream was too difficult.

-- 
Alan Modra
Australia Development Lab, IBM