第6组：启用ccache加速重复编译并保持闭环

build-wasm.sh

@@ -10,6 +10,13 @@ if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
     echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
     exit 1
 fi
+cmake_compiler_launcher_args=()
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cmake_compiler_launcher_args+=(
+        -DCMAKE_C_COMPILER_LAUNCHER=ccache
+        -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
+    )
+fi
 
 LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
 manifest=$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")
@@ -117,7 +124,8 @@ emcmake cmake -S core -B build/wasm \
     -DCMAKE_BUILD_TYPE=Release \
     -DCNC_SIM_LINUXCNC_ROOT="$linuxcnc_root" \
     -DCNC_SIM_LINUXCNC_WASM_SOURCE_MANIFEST="$manifest" \
-    -DCNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE=ON
+    -DCNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE=ON \
+    "${cmake_compiler_launcher_args[@]}"
 cmake --build build/wasm --target cnc_sim_wasm_runtime_probe --parallel "$build_jobs"
 cmake --build build/wasm --target cnc_sim_wasm --parallel "$build_jobs"
 mkdir -p web/public