Add Clang CI

.github/workflows/general-ci.yml

@@ -20,6 +20,11 @@ jobs:
       matrix:
         python-version: ['3.10','3.14']
         simplify: [0,1,autoopt]
+        compiler: [gcc]
+        include:
+          - python-version: '3.14'
+            simplify: autoopt
+            compiler: clang
 
     steps:
     - uses: actions/checkout@v6
@@ -29,6 +34,15 @@ jobs:
       uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
+    - name: Setup LLVM
+      if: matrix.compiler == 'clang'
+      run: |
+        wget https://apt.llvm.org/llvm.sh
+        chmod +x llvm.sh
+        sudo ./llvm.sh 21
+        sudo apt-get install -y libomp-dev
+        echo "CXX=$(which clang++)" >> $GITHUB_ENV
+        echo "CC=$(which clang)" >> $GITHUB_ENV
     - name: Install dependencies
       run: |
         # Make dependency setup faster