Use CLang to build Reppy

.github/workflows/checks.yml

@@ -14,10 +14,12 @@ jobs:
         - python-version: "3.11"
           env:
             TOXENV: flake8
-        # Pylint requires installing reppy, which does not support Python 3.9
-        # https://github.com/seomoz/reppy/issues/122
+        # Pylint requires installing reppy, which:
+        # - Does not support Python 3.9: https://github.com/seomoz/reppy/issues/122
+        # - Requires CLang to build https://github.com/seomoz/reppy/issues/132
         - python-version: 3.8
           env:
+            CC: clang
             TOXENV: pylint
         - python-version: 3.7
           env:
@@ -37,6 +39,12 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
+    - name: Set up Clang
+      uses: egor-tensin/setup-clang@v1
+      with:
+        version: latest
+        platform: x64
+
     - name: Run check
       env: ${{ matrix.env }}
       run: |

.github/workflows/tests-ubuntu.yml

@@ -38,11 +38,12 @@ jobs:
           env:
             TOXENV: pypy3-pinned
 
-        # extras
-        # extra-deps includes reppy, which does not support Python 3.9
-        # https://github.com/seomoz/reppy/issues/122
+        # extra-deps includes reppy, which:
+        # - Does not support Python 3.9: https://github.com/seomoz/reppy/issues/122
+        # - Requires CLang to build https://github.com/seomoz/reppy/issues/132
         - python-version: 3.8
           env:
+            CC: clang
             TOXENV: extra-deps
 
     steps:
@@ -59,6 +60,12 @@ jobs:
         sudo apt-get update
         sudo apt-get install libxml2-dev libxslt-dev
 
+    - name: Set up Clang
+      uses: egor-tensin/setup-clang@v1
+      with:
+        version: latest
+        platform: x64
+
     - name: Run tests
       env: ${{ matrix.env }}
       run: |