Add some options from the Windows script to the MacOS script

Hopefully, they might even work, too.

Also move ccache installation to the CI script as it's not mandatory to use ccache for local builds.

.gitlab-ci.yml

@@ -555,11 +555,12 @@ Ubuntu_GCC_integration_tests_asan:
     - ccache/
   script:
     - CI/before_install.macos.sh
+    - brew install ccache
     - export CCACHE_BASEDIR="$(pwd)"
     - export CCACHE_DIR="$(pwd)/ccache"
     - mkdir -pv "${CCACHE_DIR}"
     - ccache -z -M "${CCACHE_SIZE}"
-    - CI/before_script.macos.sh
+    - CI/before_script.macos.sh -C
     - CI/macos/build.sh
     - cd build
     - for dmg in *.dmg; do mv "$dmg" "${dmg%.dmg}_${DMG_IDENTIFIER}_${CI_COMMIT_REF_NAME##*/}.dmg"; done

CI/before_install.macos.sh

@@ -6,5 +6,4 @@ else
     ./CI/macos/before_install.arm64.sh
 fi
 
-command -v ccache >/dev/null 2>&1 || brew install ccache
 command -v cmake >/dev/null 2>&1 || brew install cmake

CI/before_script.macos.sh

@@ -1,7 +1,69 @@
 #!/bin/bash -e
 
+VERBOSE=""
+USE_CCACHE=""
+KEEP=""
+USE_WERROR=""
+
+while [ $# -gt 0 ]; do
+	ARGSTR=$1
+	shift
+
+	if [ ${ARGSTR:0:1} != "-" ]; then
+		echo "Unknown argument $ARGSTR"
+		echo "Try '$0 -h'"
+		wrappedExit 1
+	fi
+
+	for (( i=1; i<${#ARGSTR}; i++ )); do
+		ARG=${ARGSTR:$i:1}
+		case $ARG in
+			V )
+				VERBOSE=true ;;
+
+			C )
+				USE_CCACHE=true ;;
+
+			k )
+				KEEP=true ;;
+
+			E )
+				USE_WERROR=true ;;
+
+			h )
+				cat <<EOF
+Usage: $0 [-VCkETh]
+Options:
+	-C
+		Use ccache.
+	-h
+		Show this message.
+	-k
+		Keep the old build directory, default is to delete it.
+	-V
+		Run verbosely
+	-E
+		Use warnings as errors (-Werror)
+EOF
+				exit 0
+				;;
+
+			* )
+				echo "Unknown argument $ARG."
+				echo "Try '$0 -h'"
+				exit 1 ;;
+		esac
+	done
+done
+
+if [[ -z $KEEP ]]; then
+    if [[ -n $VERBOSE && -d "build" ]]; then
+        echo "Deleting existing build directory"
+    fi
     rm -fr build
-mkdir build
+fi
+
+mkdir -p build
 cd build
 
 DEPENDENCIES_ROOT="/tmp/openmw-deps"
@@ -16,10 +78,14 @@ else
     OPENAL_PATH=$(brew --prefix openal-soft)
 fi
 
+if [[ -n $VERBOSE ]]; then
+    echo "Using Qt path: ${QT_PATH}"
+    echo "Using ICU path: ${ICU_PATH}"
+    echo "Using OpenAL path: ${OPENAL_PATH}"
+fi
+
 declare -a CMAKE_CONF_OPTS=(
 -D CMAKE_PREFIX_PATH="$DEPENDENCIES_ROOT;$QT_PATH;$OPENAL_PATH"
--D CMAKE_C_COMPILER_LAUNCHER="ccache"
--D CMAKE_CXX_COMPILER_LAUNCHER="ccache"
 -D CMAKE_CXX_FLAGS="-stdlib=libc++"
 -D CMAKE_C_COMPILER="clang"
 -D CMAKE_CXX_COMPILER="clang++"
@@ -59,6 +125,26 @@ else
     )
 fi
 
+if [[ -n $USE_CCACHE ]]; then
+    CMAKE_CONF_OPTS+=(
+        -D CMAKE_C_COMPILER_LAUNCHER="ccache"
+        -D CMAKE_CXX_COMPILER_LAUNCHER="ccache"
+    )
+fi
+
+if [[ -n $USE_WERROR ]]; then
+    CMAKE_CONF_OPTS+=(
+        -D OPENMW_CXX_FLAGS="-Werror"
+    )
+fi
+
+if [[ -n $VERBOSE ]]; then
+    echo CMake arguments: \
+        "${CMAKE_CONF_OPTS[@]}" \
+        "${BUILD_OPTS[@]}" \
+        ..
+fi
+
 cmake \
     "${CMAKE_CONF_OPTS[@]}" \
     "${BUILD_OPTS[@]}" \