chore optimized: ccache support

Author: Charliechen114514

.github/workflows/build-examples.yml

@@ -27,14 +27,24 @@ jobs:
       - name: Install build tools
         run: |
           sudo apt-get update
-          sudo apt-get install -y cmake g++-14 ninja-build
+          sudo apt-get install -y cmake g++-14 ninja-build ccache
           sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-14 100
           sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-14 100
           sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/g++-14 100
           sudo update-alternatives --install /usr/bin/cc cc /usr/bin/gcc-14 100
 
+      - name: Cache ccache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/ccache
+          key: ccache-host-${{ github.run_id }}
+          restore-keys: |
+            ccache-host-
+
       - name: Build host examples
         run: python3 scripts/build_examples.py --host
+        env:
+          CCACHE_DIR: ~/.cache/ccache
 
   build-stm32:
     name: STM32 Examples

scripts/build_examples.py

@@ -105,7 +105,8 @@ def build_project(project_dir: Path) -> BuildResult:
     all_output = []
 
     # Configure
-    configure_cmd = ['cmake', '-B', str(build_dir), '-G', 'Ninja']
+    configure_cmd = ['cmake', '-B', str(build_dir), '-G', 'Ninja',
+                      '-DCMAKE_CXX_COMPILER_LAUNCHER=ccache']
     try:
         result = subprocess.run(
             configure_cmd,