CI: oldest and newest toolchains, pinned simulator

Linux runs Swift 6.2 and 6.4, macOS runs Xcode 26.0.1 and 26.6, each in
debug and release. The iOS job pins Xcode 26.6 and an iPhone 17.

The macOS Swift 6.2 release jobs and the iOS job need Perfect-CRUD's
crud-3-release-prep on main first: CRUD main crashes in Swift 6.2
release builds, and declares no iOS (Xcode 26 then builds it for iOS 12
and fails). Checked against that branch with Xcode 26.3: 49/49 in debug,
release and the iOS Simulator.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: taplin

.github/workflows/ci.yml

@@ -4,14 +4,20 @@ on:
   push:
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   linux:
-    name: Linux (Swift 6.4, ${{ matrix.configuration }})
+    name: Linux (Swift ${{ matrix.swift }}, ${{ matrix.configuration }})
     runs-on: ubuntu-24.04
-    container: swift:6.4-noble
+    container: swift:${{ matrix.swift }}-noble
+    timeout-minutes: 30
     strategy:
       fail-fast: false
       matrix:
+        # The oldest supported Swift (swift-tools-version 6.2) and the newest.
+        swift: ["6.2", "6.4"]
         configuration: [debug, release]
     steps:
       - uses: actions/checkout@v7
@@ -36,17 +42,22 @@ jobs:
         run: swift test $FLAGS
 
   macos:
-    name: macOS (${{ matrix.configuration }})
+    name: macOS (Xcode ${{ matrix.xcode }}, ${{ matrix.configuration }})
     runs-on: macos-26
+    timeout-minutes: 30
     strategy:
       fail-fast: false
       matrix:
+        # The oldest Xcode with Swift 6.2, and the runner's default.
+        xcode: ["26.0.1", "26.6"]
         configuration: [debug, release]
     steps:
       - uses: actions/checkout@v7
 
-      - name: Toolchain
-        run: swift --version
+      - name: Select Xcode
+        run: |
+          sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app
+          swift --version
 
       - name: Build (warnings are errors)
         run: |
@@ -62,19 +73,20 @@ jobs:
   ios:
     name: iOS Simulator
     runs-on: macos-26
+    timeout-minutes: 30
     steps:
       - uses: actions/checkout@v7
 
-      - name: Pick a simulator
+      - name: Select Xcode
         run: |
+          sudo xcode-select -s /Applications/Xcode_26.6.app
           xcodebuild -version
-          # Simulator names change with each Xcode, so take the first available iPhone.
-          udid=$(xcrun simctl list devices available -j \
-            | jq -r '[.devices | to_entries[] | select(.key | contains("iOS")) | .value[] | select(.name | startswith("iPhone"))][0].udid')
-          [ -n "$udid" ] && [ "$udid" != null ] || { echo "No iPhone simulator available"; exit 1; }
-          echo "SIMULATOR=$udid" >> "$GITHUB_ENV"
 
-      # No SWIFT_TREAT_WARNINGS_AS_ERRORS here: Xcode builds the Perfect-CRUD dependency with
-      # warnings suppressed, and the two flags conflict. The macOS and Linux jobs check warnings.
+      # The test target builds at the package's iOS 15 deployment target, so this also
+      # catches APIs that need a newer iOS. No SWIFT_TREAT_WARNINGS_AS_ERRORS: Xcode builds the
+      # Perfect-CRUD dependency with warnings suppressed, and the two flags conflict. The macOS
+      # and Linux jobs check warnings.
       - name: Test
-        run: xcodebuild test -scheme PerfectSQLite -destination "platform=iOS Simulator,id=$SIMULATOR"
+        run: |
+          xcodebuild test -scheme PerfectSQLite \
+            -destination 'platform=iOS Simulator,name=iPhone 17,OS=latest'

README.md

@@ -14,7 +14,7 @@
 
 This project provides a Swift wrapper around the SQLite 3 C library, plus a [Perfect-CRUD](https://github.com/PerfectlySoft/Perfect-CRUD) database driver built on top of it.
 
-**Modernized for Swift 6.** Requires **swift-tools-version 6.2** and builds under full **Swift 6 language mode** (strict concurrency checking on for both the library and test targets). Supports **macOS 12+** and **iOS 15+** (`platforms: [.macOS(.v12), .iOS(.v15)]`) and **Linux** (tested with Swift 6.2.4, 6.3.2 and 6.4 on Ubuntu 24.04). CI runs the tests on macOS, Linux and the iOS Simulator. tvOS/watchOS/visionOS aren't declared or tested.
+**Modernized for Swift 6.** Requires **swift-tools-version 6.2** and builds under full **Swift 6 language mode** (strict concurrency checking on for both the library and test targets). Supports **macOS 12+** and **iOS 15+** (`platforms: [.macOS(.v12), .iOS(.v15)]`) and **Linux** (tested with Swift 6.2.4, 6.3.2 and 6.4 on Ubuntu 24.04). CI runs the tests on Linux (Swift 6.2 and 6.4), macOS (Xcode 26.0.1 and 26.6) and the iOS Simulator. tvOS/watchOS/visionOS aren't declared or tested.
 
 The pre-Swift-6 version of this package is preserved on the [`legacy`](../../tree/legacy) branch.