linux-kernel - Re: Build failure in linux mainline when building arcv2 images

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Message-ID: <25e43ee1-5015-9dc3-777e-6101872f2ec4@synopsys.com>
Date:	Thu, 28 Jul 2016 22:20:12 -0700
From:	Vineet Gupta <vgupta@...opsys.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-snps-arc@...ts.infradead.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jeff Moyer <jmoyer@...hat.com>,
	Alexey Brodkin <abrodkin@...opsys.COM>
Subject: Re: Build failure in linux mainline when building arcv2 images

Hi Guenter,

On 07/28/2016 08:23 PM, Guenter Roeck wrote:
> Hi Vineet,
> 
> Mainline fails to build arcv2 images with the following error.
> 
> {standard input}: Assembler messages:
> {standard input}:19174: Error: Instruction with long immediate data in delay slot
> make[2]: *** [block/cfq-iosched.o] Error 1
> 
> Bisect points to commit 9a7f38c42c2 ("cfq-iosched: Convert from jiffies to
> nanoseconds"),
> but I don't really hold it responsible. It looks more like a compiler / binutils
> problem
> to me.

Indeed - triggers a latent bug in ARC gcc !

> I am using a toolchain built with buildroot (gcc 4.8.3). Is there a more recent
> toolchain
> than the one in buildroot available, by any chance ? If yes, where do I find it ?

Yeah there's a 4.8.5 based one (referred to as GNU 2016.03) - will prebuilt
toolchain suffice or would you prefer building on your own. Prebuilt could be
found below.

https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/tag/arc-2016.03

For building on your own, Alexey can point to upstream buildroot which enabled
2016.03 tools.

Thx,
-Vineet