Split jobs, for better ability to reason about the code

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  library:
+  tests:
     runs-on: macos-14
     strategy:
       matrix:
@@ -69,11 +69,40 @@ jobs:
           elif [[ "${{ matrix.combination.variation }}" == "examples" ]]; then
             echo "IOS_VERSION=${{ matrix.combination.os_version }}" >> $GITHUB_ENV
           fi
-      - name: Run Library Evolution builds
-        run: make build-for-library-evolution
       - name: Run tests
         run: make test-${{ matrix.combination.variation }}
 
+  library-evolution:
+    runs-on: macos-14
+    strategy:
+      matrix:
+        combination:
+          - xcode: '15.4'
+            variation: ios
+            os_version: 17.5
+          - xcode: '16.2'
+            variation: ios
+            os_version: 18.1
+
+          - xcode: '15.4'
+            variation: macos
+          - xcode: '16.2'
+            variation: macos
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Select Xcode ${{ matrix.combination.xcode }}
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.combination.xcode }}.app
+      - name: Skip macro validation
+        run: defaults write com.apple.dt.Xcode IDESkipMacroFingerprintValidation -bool YES
+      - name: Set OS version
+        run: |
+          if [[ "${{ matrix.combination.variation }}" == "ios" ]]; then
+            echo "IOS_VERSION=${{ matrix.combination.os_version }}" >> $GITHUB_ENV
+          fi
+      - name: Run Library Evolution builds
+        run: make library-evolution-${{ matrix.combination.os_version }}
+
   wasm:
     name: SwiftWasm
     runs-on: ubuntu-latest

Makefile

@@ -70,9 +70,9 @@ test-docs:
 		|| (echo "xcodebuild docbuild failed:\n\n$(DOC_WARNINGS)" | tr '\1' '\n' \
 		&& exit 1)
 
-build-for-library-evolution: build-for-library-evolution-ios build-for-library-evolution-macos
+library-evolution: build-for-library-evolution-ios build-for-library-evolution-macos
 
-build-for-library-evolution-macos:
+library-evolution-macos:
 	swift build \
 		-c release \
 		--target SwiftUINavigation \
@@ -87,7 +87,7 @@ build-for-library-evolution-macos:
 		-Xswiftc -enable-library-evolution \
 		-Xswiftc $(OTHER_SWIFT_FLAGS)
 
-build-for-library-evolution-ios:
+library-evolution-ios:
 	xcodebuild build \
 	  -skipMacroValidation \
 		-workspace SwiftNavigation.xcworkspace \