[jdk8u-dev] RFR: 8369226: GHA: Switch to MacOS 15 [v3]

[Andrew John Hughes]

On Sat, 31 Jan 2026 11:46:46 GMT, Andrew John Hughes <andrew at openjdk.org> wrote:

>> This is a backport of [JDK-8369226](https://bugs.openjdk.org/browse/JDK-8369226) from 11u that upgrades from macos-13 to macos-15-intel, and XCode from 14.3.1 to 16.4, as MacOS 13 runners are now unavailable.
>> 
>> Due to the different structure of the GHA support in 8u, and the absence of aarch64 on MacOS, this is a backport in spirit rather than a 1:1 relationship, with the same values being changed in their different locations in the 8u `submit.yml`.
>
> Andrew John Hughes has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:
> 
>  - Merge remote-tracking branch 'dev/master' into JDK-8369226
>  - Revert LOG_LEVEL=debug additions
>  - Backport 1b0f612e5e08cfa1581cf22433b36b5f075c0f23
>  - Print spec files on all POSIX platforms
>  - Add LOG_LEVEL=debug to all GHA builds
>  - Whitespace cleanup
>  - 8374899: [8u] Fully handle clang as the toolchain in flags.m4

MacOS build failure is fixed by https://github.com/openjdk/jdk8u-dev/pull/742

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PR Comment: https://git.openjdk.org/jdk8u-dev/pull/738#issuecomment-3828284601