[fedora-arm] Re: Questions for building RPMs for armel and armfp

On 07/15/2017 06:17 PM, Peter Robinson wrote:
> Fedora hasn't supported anything less than ARMv7 (armhfp) since Fedora 18.

Not what I was hoping. But lack of an armel build isn't a long term issue.
Do any contemporary Fedora ARM derivatives exist which may still maintain
armel build infrastructure?

> No, we don't support cross compiling anything except the kernel.
> There's lots of complexity in dealing with cross compiling and there's
> code that's run during the builds that needs to run on the actual
> architecture that's not actually compiling.

My information admittedly is dated. When i was involved a number of years
ago, effort was being expended to support Fedora SRPM cross build by Marvell
and others IIRC. Appears moot now.

>> - Beyond cross builds infrastructure support is the question of what degree SRPMs
>> themselves support cross platform builds. This being an embedded platform, runtime
>> needs are minimal (no graphics, no heavy scripting languages, applications, etc..
>> So we're not faced with building a conventional workstation class RPM userland content.
> I don't understand what you mean by that statement/question.

I was assuming cross build of SRPMs may still be supported but probably wasn't
as complete as the case of a native build. That wouldn't likely have been an issue
for this embedded use case and the core userland runtime is most of what is
required. Again moot.

> The Fedora infrastructure runs 32 bit VMs as builders running on 64
> bit hardware.

64-bit ARM or x86_64 host hardware? If ARM is that leveraging kvm to accelerate
the 32-bit VM?

> aarch64 is quite a bit different to ARMv7 in terms of instructions so
> we don't support a multilib style env like x86_64/i686 does.

So the model is a strict self-hosted native build where the host's distro and
toolchain is exactly that of the target, correct?

Thanks,

-john
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