linux-kernel - Re: [PATCH] kernel: add support for gcc 5

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Date:	Thu, 04 Sep 2014 17:38:33 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Richard Weinberger <richard.weinberger@...il.com>
CC:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
	Greg KH <greg@...ah.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH] kernel: add support for gcc 5

On 09/04/2014 05:25 PM, Andrew Morton wrote:
> On Thu, 4 Sep 2014 23:19:34 +0200 Richard Weinberger <richard.weinberger@...il.com> wrote:
> 
>> On Thu, Sep 4, 2014 at 11:12 PM, Andrew Morton
>> <akpm@...ux-foundation.org> wrote:
>>> On Thu,  4 Sep 2014 11:37:19 -0400 Sasha Levin <sasha.levin@...cle.com> wrote:
>>>
>>>> We're missing include/linux/compiler-gcc5.h which is required now
>>>> because gcc branched off to v5 in trunk.
>>>>
>>>> Just copy the relevant bits out of include/linux/compiler-gcc4.h,
>>>> no new code is added as of now.
>>>>
>>>> This fixes a build error when using gcc 5.
>>>
>>> I think I'll stick a cc:stable on this one, as people will presumably
>>> wish to compile older kernels with newer gcc's at some time in the
>>> future.
>>
>> CC'ing Hannes, he sent a much simpler gcc5 patch a few days ago.
>> https://lkml.org/lkml/2014/8/26/710
> 
> That approach won't last for long - as soon as we add some
> gcc5-specific thing, we'll need a new file.
> 
> Let history be a guide:
> 
> diff -u include/linux/compiler-gcc3.h include/linux/compiler-gcc4.h

I didn't see Hannes version before sending mine, apologies for that.

Right now something in gcc5 seems to be broken since my test VMs refuse
to even load up their *very* trivial userspace properly (/bin/bash just
hangs) so I suspect we'll have changes to that file even before the first
official version of gcc5 is out.


Thanks,
Sasha

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