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

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Message-ID: <579B5D79.8060907@roeck-us.net>
Date:	Fri, 29 Jul 2016 06:43:21 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Vineet Gupta <vgupta@...opsys.com>
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

On 07/28/2016 10:20 PM, Vineet Gupta wrote:
> 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.
>

Unfortunately, I get the same error when using "arc-linux-gcc.br_real (Buildroot 2016.05) 4.8.5".

Guenter