[jfx21u] RFR: 8278021: Fix warnings in macOS glass native code and treat warnings as errors

Fri Feb 27 10:25:25 UTC 2026

Hi all,

This pull request contains a backport of commit [e0b88bc7](https://github.com/openjdk/jfx/commit/e0b88bc7cfede46afe28cbb4a2e333df933b5100) from the [openjdk/jfx](https://git.openjdk.org/jfx) repository.

The commit being backported was authored by Martin Fox on 22 Feb 2024 and was reviewed by Kevin Rushforth and Ajit Ghaisas.

Thanks!

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Commit messages:
 - Backport e0b88bc7cfede46afe28cbb4a2e333df933b5100

Changes: https://git.openjdk.org/jfx21u/pull/114/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx21u&pr=114&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8278021
  Stats: 59 lines in 17 files changed: 39 ins; 5 del; 15 mod
  Patch: https://git.openjdk.org/jfx21u/pull/114.diff
  Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/114/head:pull/114

PR: https://git.openjdk.org/jfx21u/pull/114