Use ccache with cmake on travis.

This replaces the custom python script which manipulated various files' mtime with ccache for allowing cmake builds to not need full recompiles every travis run.

.travis.yml

@@ -5,6 +5,7 @@ services:
     - docker
 
 cache:
+  ccache: true
   directories:
     - build-cache
 
@@ -62,12 +63,12 @@ script:
           ./utils/travis/check_utf8.sh;
           ./utils/travis/utf8_bom_dog.sh;
           "$CXX" --version;
-          scons wesnoth wesnothd campaignd boost_unit_tests build=release ctool="$CC" cxxtool="$CXX" --debug=time extra_flags_config="-pipe" extra_flags_release="$EXTRA_FLAGS_RELEASE" strict=true cxx_std="$CXXSTD" nls="$NLS" jobs=2;
+          scons wesnoth wesnothd campaignd boost_unit_tests build=release ctool="$CC" cxxtool="$CXX" --debug=time extra_flags_config="-pipe" extra_flags_release="$EXTRA_FLAGS_RELEASE" strict=true cxx_std="$CXXSTD" nls="$NLS" jobs=2 enable_lto=false;
       else
           export DISPLAY=:99.0;
           /sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -ac -screen 0 1024x768x24;
 
-          docker run -v "$PWD"/build-cache:/home/wesnoth-travis/build wesnoth-repo:16.04 bash -c './docker_run.sh "$@"' bash "$NLS" "$TOOL" "$CC" "$CXX" "$CXXSTD" "$EXTRA_FLAGS_RELEASE" "$WML_TESTS" "$WML_TEST_TIME" "$PLAY_TEST" "$MP_TEST" "$BOOST_TEST";
+          docker run -v "$PWD"/build-cache:/home/wesnoth-travis/build -v "$HOME"/.ccache:/root/.ccache wesnoth-repo:16.04 bash -c './docker_run.sh "$@"' bash "$NLS" "$TOOL" "$CC" "$CXX" "$CXXSTD" "$EXTRA_FLAGS_RELEASE" "$WML_TESTS" "$WML_TEST_TIME" "$PLAY_TEST" "$MP_TEST" "$BOOST_TEST";
       fi
 
 notifications:

docker/Dockerfile-travis

@@ -2,5 +2,7 @@ FROM wesnoth/wesnoth:16.04
 
 COPY ./ /home/wesnoth-travis/
 
+RUN apt install -y -qq ccache
+
 WORKDIR /home/wesnoth-travis
 

docker_run.sh

@@ -49,19 +49,13 @@ if [ "$NLS" == "true" ]; then
 else
 # if not doing the translations, build wesnoth, wesnothd, campaignd, boost_unit_tests
   if [ "$TOOL" == "cmake" ]; then
-# softlink to build/ for cmake, since that's where the docker mount point is
-    cd src/
-    ln -s ../build CMakeFiles
-    cd ..
-# run cmake separately so config.h will be seen by the md5 script
-    cmake -DCMAKE_BUILD_TYPE=Release -DENABLE_GAME=true -DENABLE_SERVER=true -DENABLE_CAMPAIGN_SERVER=true -DENABLE_TESTS=true -DENABLE_NLS=false -DEXTRA_FLAGS_CONFIG="-pipe" -DEXTRA_FLAGS_RELEASE="$EXTRA_FLAGS_RELEASE" -DENABLE_STRICT_COMPILATION="$STRICT"
-# run manual md5 file tracking/mtime modification script for cmake
-    python3 cmake_mtime_crc.py
-
-    make VERBOSE=1 -j2
+# set ccache configurations
+    echo "max_size = 200M" > $HOME/.ccache/ccache.conf
+    echo "compiler_check = content" >> $HOME/.ccache/ccache.conf
 
+    cmake -DCMAKE_BUILD_TYPE=Release -DENABLE_GAME=true -DENABLE_SERVER=true -DENABLE_CAMPAIGN_SERVER=true -DENABLE_TESTS=true -DENABLE_NLS=false -DEXTRA_FLAGS_CONFIG="-pipe" -DEXTRA_FLAGS_RELEASE="$EXTRA_FLAGS_RELEASE" -DENABLE_STRICT_COMPILATION="$STRICT" -DENABLE_LTO=false -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache && make VERBOSE=1 -j2
   else
-    scons wesnoth wesnothd campaignd boost_unit_tests build=release ctool=$CC cxxtool=$CXX --debug=time extra_flags_config="-pipe" extra_flags_release="$EXTRA_FLAGS_RELEASE" strict="$STRICT" cxx_std=$CXXSTD nls=false jobs=2
+    scons wesnoth wesnothd campaignd boost_unit_tests build=release ctool=$CC cxxtool=$CXX --debug=time extra_flags_config="-pipe" extra_flags_release="$EXTRA_FLAGS_RELEASE" strict="$STRICT" cxx_std=$CXXSTD nls=false jobs=2 enable_lto=false
   fi
 
 # check if the build was successful
@@ -78,6 +72,7 @@ else
     ./run_wml_tests -g -v -c -t "$WML_TEST_TIME"
     RET=$?
     if [ $RET != 0 ]; then
+      echo "WML tests failed!"
       EXIT_VAL=$RET
     fi
   fi
@@ -87,6 +82,7 @@ else
     ./utils/travis/play_test_executor.sh
     RET=$?
     if [ $RET != 0 ]; then
+      echo "Play tests failed!"
       EXIT_VAL=$RET
     fi
   fi
@@ -96,6 +92,7 @@ else
     ./utils/travis/mp_test_executor.sh
     RET=$?
     if [ $RET != 0 ]; then
+      echo "MP tests failed!"
       EXIT_VAL=$RET
     fi
   fi
@@ -105,6 +102,7 @@ else
     ./utils/travis/test_executor.sh
     RET=$?
     if [ $RET != 0 ]; then
+      echo "Boost tests failed!"
       EXIT_VAL=$RET
     fi
   fi