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Kabir Oberai bda3c6922d build: update to Xcode 27.1, Swift 6.4.1 (#382)
## What does this PR do?

Updates the Xcode and Swift versions used to build xtool on macOS/Linux
respectively

## How was it tested?

CI

## AI tool usage

How much of this PR was AI-assisted? (check one)

- [x] **0** - No AI was used to write code
- [ ] **1** - I was assisted by AI. I reviewed the finished result.
- [ ] **2** - I set the AI going and left it to it; nobody has read the
result - no review, or AI review only

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open as a draft if it is #2. Do not lower the declared level to get the
PR reviewed. -->


<!-- This is an auto-generated comment: release notes by coderabbit.ai
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<!-- coderabbit-ai-generated:v1 -->

## Summary by CodeRabbit

- **Updates**
- Updated the Xcode version used by the build action to 27.1.0 and the
Swift version used in build environments to 6.4.1.
- **Documentation**
- Updated the Linux installation guide to reference Xcode 27.1 and the
matching `Xcode_27.1.xip` download filename. These updates align the
documented installation steps with the current tool versions.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->
bda3c6922d · 2026-10-22 22:07:28 -04:00
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