8211804: Constant AO_UNUSED_MBZ uses left shift of negative value

[mrserb]

Hi all,

This pull request contains a backport of commit 51be7db9 from the openjdk/jdk repository.

The commit being backported was authored by Kim Barrett on 9 Oct 2018 and was reviewed by Alan Bateman.

This patch fixes a build error on macOS with Xcode 16.4 that can't be resolved using --disable-warnings-as-errors.

/jdk11u-dev/src/jdk.pack/share/native/common-unpack/constants.h:206:33: error: expression is not an integral constant expression
  206 |     AO_UNUSED_MBZ             = (-1)<<13, // options bits reserved for future use.
      |                                 ^~~~~~~~

Thanks!

---

Progress

• JDK-8211804 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8211804: Constant AO_UNUSED_MBZ uses left shift of negative value (Bug - P4 - Requested)

Reviewing

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[bridgekeeper]

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[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 and summary from the original commit.

[openjdk]

⚠️ @mrserb 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.

[mrserb]

/approval request Clean backport. Fix for a broken build on macOS + XCode 16.4

[openjdk]

@mrserb
8211804: The approval request has been created successfully.

[mlbridge]

Webrevs

• 00: Full (fc00dffd)

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[mrserb]

/keepalive

[openjdk]

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