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Use Xcode-bundled Swift in CI instead of a standalone toolchain (#1353)

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The unpinned setup-swift action installs Swift 6.1, which refuses the
SDK on runner images that have rolled to Xcode 26.5 ("this SDK is not
supported by the compiler"). Jobs passed or failed depending on which
image they landed on. The Xcode-bundled toolchain always matches the
image's SDK, and matches local development. Cache keys now include the
toolchain version so artifacts from one compiler are never restored
into builds with another.

Co-authored-by: jack <jackjackbits@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
jack
2026-07-01 23:51:58 +02:00
committed by GitHub
co-authored by jack Claude Fable 5
parent f688e529f6
commit 68eeba97ff
1 changed files with 10 additions and 5 deletions
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.github/workflows/swift-tests.yml
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@@ -29,17 +29,22 @@ jobs:
- name: Checkout code
uses: actions/checkout@v5
- name: Set up Swift
uses: swift-actions/setup-swift@v2
# Use the Xcode-bundled Swift toolchain: it always matches the SDK on
# the runner image. A standalone swift.org toolchain (setup-swift) broke
# whenever the image's Xcode moved ahead of it ("this SDK is not
# supported by the compiler").
- name: Note toolchain version (cache key)
id: swift-version
run: echo "version=$(swift --version 2>/dev/null | head -1 | shasum | cut -c1-12)" >> "$GITHUB_OUTPUT"
- name: Cache build artifacts
uses: actions/cache@v4
with:
path: ${{ matrix.path }}/.build
key: ${{ runner.os }}-${{ matrix.name }}-${{ hashFiles(format('{0}/**/*.swift', matrix.path), format('{0}/**/Package.resolved', matrix.path)) }}
key: ${{ runner.os }}-${{ steps.swift-version.outputs.version }}-${{ matrix.name }}-${{ hashFiles(format('{0}/**/*.swift', matrix.path), format('{0}/**/Package.resolved', matrix.path)) }}
restore-keys: |
${{ runner.os }}-${{ matrix.name }}-${{ hashFiles(format('{0}/**/Package.resolved', matrix.path)) }}
${{ runner.os }}-${{ matrix.name }}-
${{ runner.os }}-${{ steps.swift-version.outputs.version }}-${{ matrix.name }}-${{ hashFiles(format('{0}/**/Package.resolved', matrix.path)) }}
${{ runner.os }}-${{ steps.swift-version.outputs.version }}-${{ matrix.name }}-
- name: Build tests
# Built separately so the hang watchdog below times only test