[ruby-core:97564] [Ruby master Misc#16360] Enabling IBM PowerPC/Z cases in Travis CI

Issue #16360 has been updated by jaruga (Jun Aruga).


> S390x IPv6 connect system call sometimes returning “Connection timed out” in apt-add-repository command
> https://travis-ci.community/t/6719

For Travis s390x IPv6 issue, I was told the issue was fixed by Travis.
https://travis-ci.community/t/6719/7

So, I sent the PR to enable it again here.
I tested it several times on my forked repository, and it was okay.
https://github.com/ruby/ruby/pull/2970


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Misc #16360: Enabling IBM PowerPC/Z cases in Travis CI
https://bugs.ruby-lang.org/issues/16360#change-84718

* Author: jaruga (Jun Aruga)
* Status: Open
* Priority: Normal
----------------------------------------
We added `arm64-linux` and `arm32-linux` cases to Travis CI by [the ticket](https://bugs.ruby-lang.org/issues/16234).
The `arm32-linux` case is going to be stable after [this pull-request](https://github.com/ruby/ruby/pull/2686) will be merged.

So, I would like to talk about this topic.
Currently Travis CI has following 4 multiple CPU architectures cases.

* `x86_64-linux` (Intel, 64-bit, Little-endian)
* `arm64-linux` (ARM, 64-bit, Little-endian)
* `i686-linux` (Intel, 32-bit, Little-endian)
* `arm32-linux` (ARM, 32-bit, Little-endian)

And a exciting news came from Travis CI this month.
Now Travis supports `arch: ppc64le` and `arch: s390x` as `arch: arm64` as well.

Build your open source projects on IBM Power and IBM Z CPU architecture
https://blog.travis-ci.com/2019-11-12-multi-cpu-architecture-ibm-power-ibm-z


So, how do you think about adding following 2 cases to Travis CI too?

* `ppc64le-linux` (IBM PowerPC, 64-bit, Little-endian)
* `s390x-linux` (IBM Z/Linux One, 64-bit, Big-endian)


## ppc64le, s390x use cases in Ruby project

* Searching tickets in Redmine, there were some architecture specific issues in the past.
* https://rubyci.org/ has s390x. But it seems it does not have ppc64le.
* s390x is a big-endian. It looks good to check the big-endian specific issue.


## ppc64le, s390x use cases in Linux distributions

For example Ubuntu is supporting ppc64le, s390x, providing the container image.

> https://hub.docker.com/_/ubuntu
> Supported architectures: (more info)
> amd64, arm32v7, arm64v8, i386, ppc64le, s390x

Fedora project is supporting ppc64le, s390x too.

> https://hub.docker.com/_/fedora
> Supported architectures: (more info)
> amd64, arm32v7, arm64v8, ppc64le, s390x

Are you interested in adding the ppc64le and s390x test cases to Travis CI?




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