linux-kernel - Re: Removing architectures without upstream gcc support

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Message-ID: <CAK8P3a13VDiH8+NG00p5oM2j5KMNU3JnCUurFn6EdJgztZsKHg@mail.gmail.com>
Date:   Wed, 28 Feb 2018 09:37:09 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Richard Kuo <rkuo@...eaurora.org>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:QUALCOMM HEXAGON..." <linux-hexagon@...r.kernel.org>,
        Chen Liqin <liqin.linux@...il.com>,
        Lennox Wu <lennox.wu@...il.com>,
        Guan Xuetao <gxt@...c.pku.edu.cn>,
        Guenter Roeck <linux@...ck-us.net>,
        Al Viro <viro@...iv.linux.org.uk>,
        James Hogan <jhogan@...nel.org>,
        "open list:METAG ARCHITECTURE" <linux-metag@...r.kernel.org>,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Stafford Horne <shorne@...il.com>,
        openrisc@...ts.librecores.org, David Howells <dhowells@...hat.com>
Subject: Re: Removing architectures without upstream gcc support

On Wed, Feb 28, 2018 at 3:06 AM, Richard Kuo <rkuo@...eaurora.org> wrote:
> On Thu, Feb 22, 2018 at 11:43:10PM +0100, Arnd Bergmann wrote:
>> - How do I build an llvm based toolchain for Hexagon? Do I need patches
>>   on top of the llvm-6 release branch? Where can I find the corresponding
>>   binutils-2.30 sources?
>
> Just to follow up on this, the closest thing right now to compile the kernel
> for Hexagon is the toolchain included with the Hexagon SDK.  However, the
> linker will fail because of something in the kernel build process that
> I think produces empty sections, which that linker can't handle.  A newer
> linker can handle it, but that's not scheduled to be released until much later
> this year.
>
> That's actually the closest option currently.  I tried the upstream source
> but it seems to lack some specific patches to support kernel compilation,
> so I will need to chase those down.

Thanks for trying it out. Can you point me to the sources? I tried downloading
a Hexagon SDK when I first looked at it, but only got a huge chunk of binary
java files and gave up before finding the llvm patches.

       Arnd