8369226: GHA: Switch to MacOS 15

[shipilev]

Making GHA more stable.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8369226 needs maintainer approval

Issue

• JDK-8369226: GHA: Switch to MacOS 15 (Enhancement - P4)

Reviewers

• Martin Doerr (@TheRealMDoerr - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/4115/head:pull/4115
$ git checkout pull/4115

Update a local copy of the PR:
$ git checkout pull/4115
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/4115/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 4115

View PR using the GUI difftool:
$ git pr show -t 4115

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/4115.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back shade! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (871605e9)

[TheRealMDoerr]

LGTM. Thanks for backporting it!

[openjdk]

⚠️ @shipilev This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[shipilev]

LGTM

Gaaaaah! You jinxed it! There are compiler warnings with new compiler, so GHA does not work. I'll take a look...

[TheRealMDoerr]

LGTM

Gaaaaah! You jinxed it! There are compiler warnings with new compiler, so GHA does not work. I'll take a look...

Hehe :-) Seems like JDK-8294594 needs to get backported, first.

[shipilev]

Hehe :-) Seems like JDK-8294594 needs to get backported, first.

Also https://bugs.openjdk.org/browse/JDK-8294591.

That guy again, huh. Could have been backported years ago, as to not make more problems for his future self.

[shipilev]

Working out MacOS warnings here: #4125 #4127.