CMake Config and Version exports (#22)

CMakeLists.txt

@@ -1,13 +1,11 @@
 cmake_minimum_required(VERSION 3.5)
 
-project(Irrlicht CXX)
+project(Irrlicht
+	VERSION 1.9.0
+	LANGUAGES CXX
+)
 
-set(IRRLICHT_VERSION_MAJOR 1)
-set(IRRLICHT_VERSION_MINOR 9)
-set(IRRLICHT_VERSION_RELEASE 0)
-
-set(VERSION "${IRRLICHT_VERSION_MAJOR}.${IRRLICHT_VERSION_MINOR}.${IRRLICHT_VERSION_RELEASE}")
-message(STATUS "*** Building IrrlichtMt ${VERSION} ***")
+message(STATUS "*** Building IrrlichtMt ${PROJECT_VERSION} ***")
 
 if(ANDROID)
 	set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib/Android)
@@ -28,3 +26,39 @@ endif()
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 add_subdirectory(source/Irrlicht)
+
+# Installation of library and headers.
+include(GNUInstallDirs)
+install(TARGETS IrrlichtMt
+	EXPORT IrrlichtMt-export
+	DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+)
+
+install(DIRECTORY "${PROJECT_SOURCE_DIR}/include/"
+	DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/IrrlichtMt"
+)
+
+# Installation of CMake target and configuration files.
+install(EXPORT IrrlichtMt-export
+	FILE IrrlichtMtTargets.cmake
+	NAMESPACE IrrlichtMt::
+	DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/IrrlichtMt"
+)
+
+include(CMakePackageConfigHelpers)
+configure_package_config_file("${CMAKE_CURRENT_SOURCE_DIR}/Config.cmake.in"
+	"${CMAKE_CURRENT_BINARY_DIR}/IrrlichtMtConfig.cmake"
+	INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/IrrlichtMt"
+	NO_SET_AND_CHECK_MACRO
+	NO_CHECK_REQUIRED_COMPONENTS_MACRO
+)
+write_basic_package_version_file(
+	"${CMAKE_CURRENT_BINARY_DIR}/IrrlichtMtConfigVersion.cmake"
+	COMPATIBILITY AnyNewerVersion
+)
+
+install(FILES
+	"${CMAKE_CURRENT_BINARY_DIR}/IrrlichtMtConfig.cmake"
+	"${CMAKE_CURRENT_BINARY_DIR}/IrrlichtMtConfigVersion.cmake"
+	DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/IrrlichtMt"
+)

Config.cmake.in

@@ -0,0 +1,5 @@
+@PACKAGE_INIT@
+
+if(NOT TARGET IrrlichtMt::IrrlichtMt)
+	include("${CMAKE_CURRENT_LIST_DIR}/IrrlichtMtTargets.cmake")
+endif()

source/Irrlicht/CMakeLists.txt

@@ -394,16 +394,10 @@ add_library(IrrlichtMt
 )
 
 set_target_properties(IrrlichtMt PROPERTIES
-	VERSION ${VERSION}
-	SOVERSION ${IRRLICHT_VERSION_MAJOR}.${IRRLICHT_VERSION_MINOR}
+	VERSION ${PROJECT_VERSION}
+	SOVERSION ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
 )
 
 if(WIN32)
 	set_target_properties(IrrlichtMt PROPERTIES PREFIX "") # for DLL name
 endif()
-
-# Installation
-
-include(GNUInstallDirs)
-install(TARGETS IrrlichtMt DESTINATION "${CMAKE_INSTALL_LIBDIR}")
-install(DIRECTORY "${CMAKE_SOURCE_DIR}/include/" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/irrlichtmt")