linux-kernel - Re: [PATCH 0/2] poewrpc/Boot: Fix cross compiling with clang

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Message-ID: <CACPK8XeoBufr6ScXcdESsZEg9LQBHyx5V1T2WKbTbSDCaqFYfA@mail.gmail.com>
Date:   Tue, 6 Nov 2018 11:06:24 +1030
From:   Joel Stanley <joel@....id.au>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 0/2] poewrpc/Boot: Fix cross compiling with clang

On Tue, 6 Nov 2018 at 09:07, Nick Desaulniers <ndesaulniers@...gle.com> wrote:
>
> On Sun, Nov 4, 2018 at 3:11 PM Joel Stanley <joel@....id.au> wrote:
> >
> > Hello,
> >
> > These patches allow clang to cross-compile the powerpc boot wrapper.
> > The boot wrapper constructs it's own compiler flags as it may not be
> > built for the same arch as the kernel.
>
> Hi Joel, thanks for the series!  I'm just curious, how does the boot
> wrapper run on a different arch than the kernel?

The kernel can have a ppc32 boot wrapper for a ppc64 kernel. There's
some rationale in the boot wrapper's Makefile:

 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/powerpc/boot/Makefile#n10

Cheers,

Joel