[YBA] kernel compile errors with GCC >= 4.6

[Jonathan Ben Avraham]

Problem still seems to be in 3.3 unless defined CONFIG_VSX. Should I 
submit a patch?

  - yba


On Wed, 4 Apr 2012, Baruch Siach wrote:

> Date: Wed, 4 Apr 2012 13:22:59 +0300
> From: Baruch Siach <baruch at tkos.co.il>
> To: Oleg Goldshmidt <pub at goldshmidt.org>
> Cc: Jonathan Ben Avraham <yba at tkos.co.il>, ILUG <linux-il at cs.huji.ac.il>
> Subject: Re: [YBA] kernel compile errors with GCC >= 4.6
> 
> Hi Oleg,
>
> On Wed, Apr 04, 2012 at 12:49:44PM +0300, Oleg Goldshmidt wrote:
>> On Wed, Apr 4, 2012 at 10:03 AM, Jonathan Ben Avraham <yba at tkos.co.il>wrote:
>>
>>> Dear linux-il colleagues,
>>> GCC 4.6 introduced many new warnings that cause -Werror to stop the
>>> compilation for some platforms, such as powerpc, in various files.
>>
>> Oh, I didn't even know they finally introduced -Werror... Good.
>
> This in the default only for PowerPC specific code, i.e. code under
> arch/powerpc.
>
>> If it is in the way maybe KCFLAGS=-Wno-error or similar may serve as a
>> workaround? Or KBUILD_ENABLE_EXTRA_GCC_CHECKS="" ?
>
> This behaviour can be disabled by setting CONFIG_PPC_DISABLE_WERROR, find
> under "Kernel hacking".
>
>> Cf. Documentation/kbuild/kbuild.txt
>>
>> You didn't say what kernel version - I just went to LXR for the latest.
>>
>>> My question is in general, is there somewhere where the relationship
>>> between kernel version and gcc version (or other compiler version) is made
>>> explicit?
>>
>> Not that I know of. The minimal versions of everything needed are in
>> Documentation/Changes. I guess you are not interested in "minimal".
>>
>> I would be very much surprised if the kernel could not be built with
>> gcc-4.6 - this is stock on Fedora, so lots of people must be using it.
>> Maybe not on PowerPC, though
>
> Recent kernel versions surely have all these warnings fixed. The kernel in
> question, I suppose, is quite ancient.
>
> baruch
>
>

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