support installing multiple versions

.github/workflows/test.yml

@@ -34,6 +34,36 @@ jobs:
       - name: Check cc/c++
         uses: ./.github/actions/check-cc
 
+  versions:
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, ubuntu-20.04]
+        version: ['5.0', '6.0', 7, 8, 9, 10, 11, 12]
+        exclude:
+          - {os: ubuntu-20.04, version: '5.0'}
+          - {os: ubuntu-20.04, version: '6.0'}
+          - {os: ubuntu-20.04, version: 7}
+          - {os: ubuntu-20.04, version: 8}
+    runs-on: '${{ matrix.os }}'
+    name: 'Version: ${{ matrix.os }} / ${{ matrix.version }}'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Clang
+        uses: ./
+        with:
+          version: '${{ matrix.version }}'
+          platform: '${{ matrix.platform }}'
+          cc: 1
+      - name: Build foo.exe
+        uses: ./.github/actions/build-foo
+      - name: Run foo.exe
+        uses: ./.github/actions/run-foo
+      - name: Check cc/c++
+        uses: ./.github/actions/check-cc
+        with:
+          version: '${{ matrix.version }}'
+
   cygwin:
     strategy:
       matrix: