Re: arch/mips/sgi-ip22/Platform:29: *** gcc doesn't support needed option -mr10k-cache-barrier=store. Stop.

[Joshua Kinard <kumba@gentoo.org>]

On 04/09/2014 19:13, Fengguang Wu wrote:
> On Wed, Apr 09, 2014 at 03:32:29PM +0200, Thomas Bogendoerfer wrote:
>> On Wed, Apr 09, 2014 at 10:24:45AM +0200, Florian Lohoff wrote:
>>> Most likely they never made it into gcc upstream but they are
>>> necessary working around the r10k speculative stores on non
>>> cache coherent machines like the IP28.
>>
>> IMHO the patch went upstream judging from the incremental patches
>> here http://gcc.gnu.org/ml/gcc-patches/2012-12/msg01371.html.
>>
>> Iirc it went into 4.4.0.
> 
> That's interesting. I'm using the cross compiler
> 
>         gcc-4.6.3-nolibc/mips-linux
> 
> downloaded from
> 
>         https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.6.3/
> 
> I notice there is also a mips64 compiler. Should I use that?

If you weren't using a mips64 compiler, that's probably the issue.  R10000
processors are 64-bit only, so a 'mips' toolchain probably doesn't include
the R10K cache-barrier code, causing that option to fail.

Are you configuring for IP22 (Indy, Indigo2 R4x00), or IP28 (R10000)?  Note,
IP26 (R8000) is not supported in Linux.  I think OpenBSD got it working, though.

-- 
Joshua Kinard
Gentoo/MIPS
kumba@gentoo.org
4096R/D25D95E3 2011-03-28

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