8292458: Atomic operations on scoped enums don't build with clang

[shipilev]

Clean backport to improve native atomics support. This does not fix any currently observed bugs, but it should provide more safety for backports that would use scoped enums and clang. It also makes subsequent backports cleaner. There is no bugtail recorded for this improvement, after more than a year in mainline.

Additional testing:

• MacOS AArch64 server fastdebug, tier1

---

Progress

• Change must not contain extraneous whitespace
• JDK-8292458 needs maintainer approval
• Commit message must refer to an issue

Issue

• JDK-8292458: Atomic operations on scoped enums don't build with clang (Enhancement - P4 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/1948/head:pull/1948
$ git checkout pull/1948

Update a local copy of the PR:
$ git checkout pull/1948
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/1948/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1948

View PR using the GUI difftool:
$ git pr show -t 1948

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/1948.diff

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

[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.

[mlbridge]

Webrevs

• 02: Full - Incremental (bff47966)
• 01: Full - Incremental (574b5d40)
• 00: Full (03684cca)

[shipilev]

/approval request Clean backport to improve native atomics support. This does not fix any currently observed bugs, but it should provide more safety for backports that would use scoped enums and clang. It also makes subsequent backports cleaner. There is no bugtail recorded for this improvement, after more than a year in mainline. Light testing passes.

[openjdk]

@shipilev
8292458: The approval request has been created successfully.

[openjdk]

@shipilev This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8292458: Atomic operations on scoped enums don't build with clang

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

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➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[shipilev]

/integrate

[openjdk]

Going to push as commit 2f042a4.

[openjdk]

@shipilev Pushed as commit 2f042a4.

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