Add ccache to github actions (#12)

* Add ccache to github actions

Signed-off-by: acezen <[email protected]>

.github/workflows/ci.yml

@@ -34,10 +34,18 @@ jobs:
       with:
           submodules: true
 
+    - name: Cache for ccache
+      uses: actions/cache@v3
+      with:
+        path: ~/.ccache
+        key: ${{ matrix.os }}-build-ccache-${{ hashFiles('**/git-modules.txt') }}
+        restore-keys: |
+          ${{ matrix.os }}-build-ccache-
+
     - name: Install dependencies
       run: |
         sudo apt-get update -y
-        sudo apt-get install -y libboost-graph-dev
+        sudo apt-get install -y libboost-graph-dev ccache
 
     - name: CMake
       run: |
@@ -99,6 +107,7 @@ jobs:
       run: |
         pushd build
         make -j$(nproc)
+        make ccache-stats
         popd
 
     - name: Test

CMakeLists.txt

@@ -39,6 +39,21 @@ if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
                "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
 endif ()
 
+if(NOT (CMAKE_CXX_COMPILER_LAUNCHER MATCHES "ccache") AND NOT (CMAKE_C_COMPILER_LAUNCHER MATCHES "ccache"))
+    find_program(ccache_EXECUTABLE ccache)
+    if(ccache_EXECUTABLE)
+        set(CMAKE_C_COMPILER_LAUNCHER ${ccache_EXECUTABLE})
+        set(CMAKE_CXX_COMPILER_LAUNCHER ${ccache_EXECUTABLE})
+        add_custom_target(ccache-stats
+            COMMAND ${ccache_EXECUTABLE} --show-stats
+        )
+    else()
+        add_custom_target(ccache-stats
+            COMMAND echo "ccache not found."
+        )
+    endif(ccache_EXECUTABLE)
+endif()
+
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -Wall")
 
 if (APPLE)