RFR: 8256127: Add cross-compiled foreign architectures builds to submit workflow [v5]

[Martin Doerr]

On Wed, 11 Nov 2020 21:02:38 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:
>> 
>>  - Merge branch 'master' into JDK-8256127-foreign-build
>>  - Merge branch 'master' into JDK-8256127-foreign-build
>>  - Incomplete fix: remove special dirs
>>  - Merge branch 'master' into JDK-8256127-foreign-build
>>  - Remove special directories from chroot to make it archivable
>>  - 8256127: Add cross-compiled foreign architectures builds to submit workflow
>
> Aleksey,
> 
> I'm not at all sure I want to accept these changes. I understand that you care about these exotic platforms, and so do I, but adding them to the submit workflow for *all* changes seem like the wrong way to proceed.
> 
> My concern vary all the way from increased build time, to increased usage of the Github CPU quota (which, as I understand it, is fairly large but not unlimited), to the elephant in the room: the question on who the burden lays to fix bugs in these exotic platforms. It is not at all obvious that these builds should be tested before commit.
> 
> I think this change warrants a much wider and deeper discussion about the purpose of the Github commit hook actions, how the free Github CPU quota should be spent, and on whom the responsibility lays to either make sure no. commit is pushed that breaks an exotic platform, or to rectify the problem with a follow-up issue.
> 
> I recommend you withdraw this PR and instead initiate a wider discussion on a suitable mailing list, e.g. jdk-dev.

Maybe it would be possible to build hotspot only as this is the part where things often break? This would save a lot of CPU time.
E.g. I think it'd be valueable to have at least one Big Endian platform included.
I noticed that some Oracle people use cross builds to check their changes on these platforms. It would save a bit of their time as well.

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