[YBA] kernel compile errors with GCC >= 4.6

[Baruch Siach]

Hi Yonatan,

On Wed, Apr 04, 2012 at 01:48:15PM +0300, Jonathan Ben Avraham wrote:
> Problem still seems to be in 3.3 unless defined CONFIG_VSX.

What does the warning say?

> Should I submit a patch?

Probably. Although you should base your patch on v3.4-rc1.

baruch

> 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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