[ruby-core:96199] [Ruby master Misc#16360] Enabling IBM PowerPC/Z cases in Travis CI

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


You see that "s390x-linux" case was disappeared on the latest master branch Travis now.
https://travis-ci.org/ruby/ruby/builds/623632919

I think it was a wrong way.

The modification to add s390x-linux case to allow_failures could be like this from the latest master branch's `.travis.yml`.


```
$ git diff
diff --git a/.travis.yml b/.travis.yml
index 5d1a8822cf..71945e349e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -418,6 +418,7 @@ matrix:
     - <<: *arm64-linux
     - <<: *i686-linux
     - <<: *arm32-linux
+    - <<: *s390x-linux
     - <<: *pedanticism
     - <<: *assertions
     - <<: *baseruby
@@ -438,10 +439,10 @@ matrix:
     - <<: *CALL_THREADED_CODE
     - <<: *NO_THREADED_CODE
   allow_failures:
+    - name: s390x-linux
     - name: -fsanitize=address
     - name: -fsanitize=memory
     - name: -fsanitize=undefined
-    - <<: *s390x-linux
   fast_finish: true
 
 before_script:
```


----------------------------------------
Misc #16360: Enabling IBM PowerPC/Z cases in Travis CI
https://bugs.ruby-lang.org/issues/16360#change-83085

* Author: jaruga (Jun Aruga)
* Status: Open
* Priority: Normal
* Assignee: 
----------------------------------------
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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