[jdk11u-dev] RFR: 8369226: GHA: Switch to MacOS 15 [v3]

[Severin Gehwolf]

On Fri, 14 Nov 2025 08:57:34 GMT, Antonio Vieiro <avieiro at openjdk.org> wrote:

>> Backport of [JDK-8369226](https://bugs.openjdk.org/browse/JDK-8369226) from JDK17 that upgrades `macos-13` runners to `macos-15-intel`, and XCode from `14.3.1` to `16.4`, since `macos-13` will be removed in early december.
>> 
>> The backport is not clean, as there are many differences between GHA in JDK11 and upper versions (e.g.
>> [JDK-8341097](https://bugs.openjdk.org/browse/JDK-8341097), [JDK-8325194](https://bugs.openjdk.org/browse/JDK-8325194)).
>
> Antonio Vieiro has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8336451: [11u] GHA macos-13 and macos-15 builders are unable to resolve local hostname

GHA failures on Mac are:

- [jdk/jshell/ExceptionMessageTest](https://github.com/vieiro/jdk11u-dev/actions/runs/19471852902#user-content-jdk_jshell_exceptionmessagetest)
- [jdk/jshell/JdiFailingLaunchExecutionControlTest](https://github.com/vieiro/jdk11u-dev/actions/runs/19471852902#user-content-jdk_jshell_jdifailinglaunchexecutioncontroltest)
- [jdk/jshell/JdiFailingListenExecutionControlTest](https://github.com/vieiro/jdk11u-dev/actions/runs/19471852902#user-content-jdk_jshell_jdifailinglistenexecutioncontroltest)
- [jdk/jshell/JdiHangingLaunchExecutionControlTest](https://github.com/vieiro/jdk11u-dev/actions/runs/19471852902#user-content-jdk_jshell_jdihanginglaunchexecutioncontroltest)

JDI related. Should be fixed with [JDK-8336451](https://bugs.openjdk.org/browse/JDK-8336451) (#3069)

Then there is also:
- [java/lang/ProcessBuilder/Basic#id0](https://github.com/vieiro/jdk11u-dev/actions/runs/19471852902#user-content-java_lang_processbuilder_basic#id0)

... which should be fixed with [JDK-8368192](https://bugs.openjdk.org/browse/JDK-8368192) (#3119)

Both are in the pipeline to get integrated.

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PR Comment: https://git.openjdk.org/jdk11u-dev/pull/3117#issuecomment-3551767341