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

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Message-ID: <66774d12-285a-438f-c050-fba65601bd3c@synopsys.com>
Date:	Fri, 29 Jul 2016 13:03:56 -0700
From:	Vineet Gupta <Vineet.Gupta1@...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" <Alexey.Brodkin@...opsys.com>
Subject: Re: Build failure in linux mainline when building arcv2 images

On 07/29/2016 06:43 AM, Guenter Roeck wrote:
> 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".

Weird - I don't see this when building mainline of now using prebuilt 2016.03
tools on github . I'm building axs103_smp_defconfig.

What exact buildroot commit did u use to build your tools BTW - I can try and
replicate that here !

Thx,
-Vineet