add cxxopts to cmake and 3 oses

CI/before_install.osx.sh

@@ -18,7 +18,7 @@ command -v cmake >/dev/null 2>&1 || brew install cmake
 command -v qmake >/dev/null 2>&1 || brew install qt@5
 
 # Install deps
-brew install icu4c yaml-cpp sqlite
+brew install icu4c yaml-cpp sqlite cxxopts
 export PATH="/usr/local/opt/qt@5/bin:$PATH"  # needed to use qmake in none default path as qt now points to qt6
 
 ccache --version

CI/before_script.msvc.sh

@@ -554,6 +554,7 @@ if ! [ -z "$USE_CLANG_TIDY" ]; then
 fi
 
 BULLET_VER="2.89"
+CXXOPTS_VER="v3.1.1"
 FFMPEG_VER="4.2.2"
 ICU_VER="70_1"
 LUAJIT_VER="v2.1.0-beta3-452-g7a0cf5fd"
@@ -594,6 +595,11 @@ if [ -z $SKIP_DOWNLOAD ]; then
 			"boost-${BOOST_VER}-msvc${MSVC_VER}-win${BITS}.exe"
 	fi
 
+  # cxxopts
+  download "cxxopts ${CXXOPTS_VER}" \
+    "https://github.com/jarro2783/cxxopts/archive/refs/tags/${CXXOPTS_VER}.zip" \
+    "cxxopts-${CXXOPTS_VER}.zip"
+
 	# Bullet
 	download "Bullet ${BULLET_VER}" \
 		"https://gitlab.com/OpenMW/openmw-deps/-/raw/main/windows/Bullet-${BULLET_VER}-msvc${BULLET_MSVC_YEAR}-win${BITS}-double-mt.7z" \
@@ -748,6 +754,19 @@ printf "Bullet ${BULLET_VER}... "
 	add_cmake_opts -DBULLET_ROOT="$(real_pwd)/Bullet"
 	echo Done.
 }
+printf "cxxopts ${CXXOPTS_VER}... "
+{
+  cd $DEPS_INSTALL
+  if [ -d cxxopts ]; then
+    printf -- "Exists. (No version checking) "
+  elif [ -z $SKIP_EXTRACT ]; then
+    rm -rf cxxopts
+    eval 7z x -y "${DEPS}/cxxopts-${CXXOPTS_VER}.zip" $STRIP
+    mv "cxxopts-${CXXOPTS_VER}" cxxopts
+  fi
+  add_cmake_opts -DCXXOPTS_ROOT="$(real_pwd)/cxxopts"
+  echo Done.
+}
 cd $DEPS
 echo
 printf "FFmpeg ${FFMPEG_VER}... "

CI/install_debian_deps.sh

@@ -34,7 +34,7 @@ declare -rA GROUPED_DEPS=(
 
     libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libswresample-dev
     libsdl2-dev libqt5opengl5-dev libopenal-dev libunshield-dev libtinyxml-dev
-    libbullet-dev liblz4-dev libpng-dev libjpeg-dev libluajit-5.1-dev
+    libbullet-dev liblz4-dev libpng-dev libjpeg-dev libluajit-5.1-dev libcxxopts-dev
     librecast-dev libsqlite3-dev ca-certificates libicu-dev libyaml-cpp-dev
   "
 

CMakeLists.txt

@@ -236,6 +236,8 @@ find_package(OpenGL REQUIRED)
 
 find_package(LZ4 REQUIRED)
 
+find_package(CXXOPTS REQUIRED)
+
 if (USE_QT)
     find_package(QT REQUIRED COMPONENTS Core NAMES Qt6 Qt5)
     if (QT_VERSION_MAJOR VERSION_EQUAL 5)