linux-kernel - Re: [PATCH v2] raid6/ppc: Fix build for clang

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Message-ID: <20181203232440.GB3803@gate.crashing.org>
Date:   Mon, 3 Dec 2018 17:24:41 -0600
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Joel Stanley <joel@....id.au>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>, Jinsong Ji <jji@...ibm.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2] raid6/ppc: Fix build for clang

On Tue, Dec 04, 2018 at 08:43:47AM +1030, Joel Stanley wrote:
> On Tue, 4 Dec 2018 at 05:15, Nick Desaulniers <ndesaulniers@...gle.com> wrote:
> > > > > +ifdef CONFIG_CC_IS_CLANG
> > > > > +# clang ppc port does not yet support -maltivec when -msoft-float is
> > > > > +# enabled. A future release of clang will resolve this
> > > > > +# https://bugs.llvm.org/show_bug.cgi?id=31177

> > As in clang itself crashes, and cc-option/kbuild can't handle that gracefully?
> 
> The developer gets something like this:
> 
> SplitVectorResult #0: t196: v16i8 = llvm.ppc.altivec.vcmpgtsb
> TargetConstant:i64<4823>, t146, t195
> fatal error: error in backend: Do not know how to split the result of
> this operator!
> clang-8: error: clang frontend command failed with exit code 70 (use
> -v to see invocation)

-msoft-float simply means not to use FPRs, and nothing more or less, so
that is a pretty interesting failure (will probably turn out to be a typo
or something else boring, but it is fun while it lasts).


Segher