Use clang-cl and others bells and wisthels

Author: FrancescAlted

.github/workflows/cibuildwheels.yml

@@ -18,7 +18,7 @@ env:
   # musllinux takes too long to build, and it's not worth it for now
   CIBW_SKIP: "pp* *musllinux* *-win32"
   # Use explicit generator/compiler env vars; CMAKE_ARGS with spaces is not split on Windows.
-  CIBW_ENVIRONMENT_WINDOWS: "PATH=C:\\Program Files\\LLVM\\bin;%PATH% CC=clang-cl CXX=clang-cl CMAKE_GENERATOR=Ninja CMAKE_C_COMPILER=clang-cl CMAKE_CXX_COMPILER=clang-cl"
+  CIBW_ENVIRONMENT_WINDOWS: "PATH=C:\\Program Files\\LLVM\\bin;%PATH% CC=clang-cl CXX=clang-cl CMAKE_GENERATOR=Ninja CMAKE_C_COMPILER=clang-cl CMAKE_CXX_COMPILER=clang-cl CMAKE_C_COMPILER_LAUNCHER=sccache CMAKE_CXX_COMPILER_LAUNCHER=sccache CMAKE_BUILD_PARALLEL_LEVEL=8 SKBUILD_PARALLEL_LEVEL=8 SCCACHE_DIR=C:\\Users\\runneradmin\\AppData\\Local\\sccache"
 
 jobs:
 
@@ -79,6 +79,32 @@ jobs:
         id: ninja
         uses: turtlesec-no/get-ninja@main
 
+      - name: Add LLVM to PATH (Windows)
+        if: ${{ matrix.os == 'windows-latest' }}
+        run: echo "C:\\Program Files\\LLVM\\bin" >> $env:GITHUB_PATH
+
+      - name: Install sccache (Windows)
+        if: ${{ matrix.os == 'windows-latest' }}
+        run: choco install sccache --yes
+
+      - name: Cache sccache (Windows)
+        if: ${{ matrix.os == 'windows-latest' }}
+        uses: actions/cache@v4
+        with:
+          path: C:\Users\runneradmin\AppData\Local\sccache
+          key: sccache-${{ runner.os }}-${{ github.sha }}
+          restore-keys: |
+            sccache-${{ runner.os }}-
+
+      - name: Cache pip (Windows)
+        if: ${{ matrix.os == 'windows-latest' }}
+        uses: actions/cache@v4
+        with:
+          path: C:\Users\runneradmin\AppData\Local\pip\Cache
+          key: pip-${{ runner.os }}-${{ hashFiles('pyproject.toml') }}
+          restore-keys: |
+            pip-${{ runner.os }}-
+
       - name: Install MSVC amd64
         uses: ilammy/msvc-dev-cmd@v1
         with: