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

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Message-ID: <e19e3a9f47c988b30a19316ee3de2b588e20a641.camel@buserror.net>
Date:   Mon, 16 Nov 2020 14:27:12 -0600
From:   Scott Wood <oss@...error.net>
To:     Segher Boessenkool <segher@...nel.crashing.org>,
        Fāng-ruì Sòng <maskray@...gle.com>
Cc:     Arnd Bergmann <arnd@...nel.org>, kbuild-all@...ts.01.org,
        kernel test robot <lkp@...el.com>,
        Brian Cain <bcain@...eaurora.org>,
        Alan Modra <amodra@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Error: invalid switch -me200

On Fri, 2020-11-13 at 18:50 -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).  Perhaps -me5500 will work for it
> instead.

According to Wikipedia e200 is from mpc55xx (for which I don't see any
platform support having ever been added).  e5500 is completely different (64-
bit version of e500mc).

-Scott