Re: [Buildroot] [PATCH 1/1] package/pixman: fix powerpc64le build

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello Joel,

Do you have some updates on this pixman issue?

Thanks a lot!

Thomas Petazzoni

On Tue, 19 Jul 2022 10:27:24 +0200
Thomas Petazzoni via buildroot <buildroot@buildroot.org> wrote:

> Hello Joel,
> 
> On Tue, 19 Jul 2022 07:46:03 +0000
> Joel Stanley <joel@jms.id.au> wrote:
> 
> > There's a few build failures going around due to nonsense
> > configurations. In most cases the config has BR2_powerpc64le=y without
> > selecting a CPU.  
> 
> "Not selecting a CPU" is not possible. There is always a CPU within the:
> 
> choice
>         prompt "Target Architecture Variant"
>         default BR2_generic_powerpc
>         help
>           Specific CPU variant to use
> 
> ...
> endchoice
> 
> that will be selected. However...
> 
> > This defaults us to BR2_powerpc_970=y, which is a CPU
> > that isn't supported to run ppc64le.  
> 
> ... it seems like some of them are selectable on ppc64le, even though
> they do not make sense.
> 
> > The fix is to only allow CPUs that support ppc64le to be configured
> > for that platform. I've prepared some patches that I'm running though
> > CI now, and I'll send them out once they're tested.  
> 
> Excellent! Looking forward to it!
> 
> > If my changes don't fix this pixman issue then we can use the
> > BR2_POWERPC_CPU_HAS_ALTIVEC to force AltiVec/VMX off when we know the
> > CPU does not support it.  
> 
> But there's still a weird thing going on: pixman has a configure.ac
> check that compiles a small test program to verify if VMX support is
> available... and it concludes it is, but the actual pixman code then
> fails to build.
> 
> Thanks for your feedback!
> 
> Thomas



-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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