Update Github CI versions.

- Use latest macOS and default Xcode versions for primary CI environment.
- Github CI no longer supports macOS 11.
  Update legacy CI to macOS 12 and Xcode 13.4.1.

.github/workflows/CI.yml

@@ -15,17 +15,17 @@ jobs:
  build:
  strategy:
  matrix:
- xcode: [ "15.0" ]
+ # Primary build on latest macOS and its default Xcode version
+ os: [ "macos-latest" ]
  platform: [ "all", "macos", "ios" ]
- os: [ "macos-13" ]
  upload_artifacts: [ true ]
 
- # Legacy configurations
- include:
- - xcode: "12.5.1"
- platform: "macos"
- os: "macos-11"
- upload_artifacts: false
+ # Legacy build. Up to 3 versions behind latest (or beta).
+# include:
+# - os: "macos-12"
+# xcode: "13.4.1"
+# platform: "macos"
+# upload_artifacts: false
  fail-fast: false
 
  name: 'MoltenVK (Xcode ${{ matrix.xcode }} - ${{ matrix.platform }})'
@@ -44,6 +44,9 @@ jobs:
  with:
  python-version: '3.11'
 
+ - name: List available Xcode versions
+ run: ls /Applications | grep Xcode
+
  - name: Select Xcode version
  run: sudo xcode-select -switch "${XCODE_DEV_PATH}"