RFR: 8256127: Add cross-compiled foreign architectures builds to submit workflow [v6]

[Robin Westberg]

On Fri, 13 Nov 2020 10:54:01 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Looks good! I did a similar attempt at cross building a while ago, but never got around to finishing it, so it's nice to see it materializing! I do have a general comment on reducing the amount of duplicated content though. Since all these cross-build platforms share the same prerequisites, they can be expressed as matrix builds. Here's what I did: https://github.com/rwestberg/jdk/blob/947c934621c3013c055152356615e0120382cedf/.github/workflows/submit.yml#L102
>> 
>> You'd have to adjust the details obviously, but I think it could help with future maintainability.
>> 
>> Another minor comment is that it may be faster to use http://debian-archive.trafficmanager.net/debian/ instead of http://httpredir.debian.org/debian/ (the former is Azure-specific but I don't think it's part of the list that the latter uses). But since it will be cached after first use it probably doesn't matter much.
>
>> Looks good! I did a similar attempt at cross building a while ago, but never got around to finishing it, so it's nice to see it materializing! I do have a general comment on reducing the amount of duplicated content though. Since all these cross-build platforms share the same prerequisites, they can be expressed as matrix builds. Here's what I did: https://github.com/rwestberg/jdk/blob/947c934621c3013c055152356615e0120382cedf/.github/workflows/submit.yml#L102
> 
> Right. AFAIU your code, it bootstraps the chroot and builds x86_64 build JDK for every config and every run, something this PR is able to avoid. We'd need to figure that out. I think that is pretty doable, but it would require a few days worth of pipeline testing to work out the kinks. So, would you mind we do that in the follow-ups?

Yeah, it would certainly need a bit of adaptation to capture the differences properly, so perfectly fine to look into later!

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PR: https://git.openjdk.java.net/jdk/pull/1147