Cache compilation using ccache

.gitlab-ci.yml

@@ -7,19 +7,24 @@ Debian:
     - linux
   image: debian:bullseye
   cache:
-    key: apt-cache
+    key: cache.002
     paths:
     - apt-cache/
+    - ccache/
   before_script:
     - export APT_CACHE_DIR=`pwd`/apt-cache && mkdir -pv $APT_CACHE_DIR
     - apt-get update -yq 
-    - apt-get -o dir::cache::archives="$APT_CACHE_DIR" install -y cmake build-essential libboost-filesystem-dev libboost-program-options-dev libboost-system-dev libboost-iostreams-dev libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libswresample-dev libsdl2-dev libqt5opengl5-dev libopenal-dev libopenscenegraph-dev libunshield-dev libtinyxml-dev libmygui-dev libbullet-dev
+    - apt-get -o dir::cache::archives="$APT_CACHE_DIR" install -y cmake build-essential libboost-filesystem-dev libboost-program-options-dev libboost-system-dev libboost-iostreams-dev libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libswresample-dev libsdl2-dev libqt5opengl5-dev libopenal-dev libopenscenegraph-dev libunshield-dev libtinyxml-dev libmygui-dev libbullet-dev ccache
   stage: build
-  script: 
+  script:
+    - export CCACHE_BASEDIR="`pwd`"
+    - export CCACHE_DIR="`pwd`/ccache" && mkdir -pv "$CCACHE_DIR"
+    - ccache -z -M 250M
     - cores_to_use=$((`nproc`-2)); if (( $cores_to_use < 1 )); then cores_to_use=1; fi
-    - mkdir build; cd build; cmake -DCMAKE_BUILD_TYPE=MinSizeRel ../
+    - mkdir build; cd build; cmake -DCMAKE_BUILD_TYPE=MinSizeRel ../ -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
     - make -j$cores_to_use
     - DESTDIR=artifacts make install
+    - ccache -s
   artifacts:
     paths:
       - build/artifacts/