(cmake) Fix the targets export to also have proper version number

FullSimLight/MagneticField/CMakeLists.txt

@@ -3,13 +3,10 @@ cmake_minimum_required( VERSION 3.1...3.19 )
 
 project( "MagneticField" VERSION ${GeoModel_VERSION} LANGUAGES CXX )
 
-# Set up the build of the three libraries of the project.
+# Set up the build of the libraries of the project's subpackages
 add_subdirectory(MagFieldInterfaces)
 add_subdirectory(MagFieldServices)
 
-install(EXPORT MagFieldInterfaces-export FILE MagneticField-MagFieldInterfaces.cmake DESTINATION lib/cmake/MagneticField)
-install(EXPORT MagFieldServices-export FILE MagneticField-MagFieldServices.cmake DESTINATION lib/cmake/MagneticField)
-install(FILES cmake/MagneticFieldConfig.cmake DESTINATION lib/cmake/MagneticField)
 
 # Install headers 
 file( GLOB HEADERS_Int MagFieldInterfaces/MagFieldInterfaces/*.h )
@@ -21,4 +18,28 @@ install( FILES ${HEADERS_Svc}
    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/MagFieldServices
    COMPONENT Development )
 
+# install the CMake configuration files of the subpackages
+install(EXPORT MagFieldInterfaces-export FILE MagneticField-MagFieldInterfaces.cmake DESTINATION lib/cmake/MagneticField)
+install(EXPORT MagFieldServices-export FILE MagneticField-MagFieldServices.cmake DESTINATION lib/cmake/MagneticField)
+
+# Write and install the version file
+write_basic_config_version_file(
+   ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/${PROJECT_NAME}ConfigVersion.cmake
+   VERSION ${PROJECT_VERSION}
+   COMPATIBILITY SameMajorVersion )
+install(
+   FILES
+   ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/${PROJECT_NAME}ConfigVersion.cmake
+   COMPONENT Development
+   DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME} )
+
+# Install the hand-written project configuration.
+configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/cmake/MagneticFieldConfig.cmake.in
+   ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/${PROJECT_NAME}Config.cmake
+   @ONLY )
+install(
+   FILES
+   ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/${PROJECT_NAME}Config.cmake
+   COMPONENT Development
+   DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME} )
 

FullSimLight/MagneticField/cmake/MagneticFieldConfig.cmake → FullSimLight/MagneticField/cmake/MagneticFieldConfig.cmake.in

@@ -3,3 +3,15 @@ get_filename_component(SELF_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
 include(${SELF_DIR}/MagneticField-MagFieldInterfaces.cmake)
 include(${SELF_DIR}/MagneticField-MagFieldServices.cmake)
 
+# Set the version of the installed project.
+set( MagneticField_VERSION "@PROJECT_VERSION@" )
+
+# Print some standard messages about the package being found.
+include( FindPackageHandleStandardArgs )
+find_package_handle_standard_args( MagneticField
+    FOUND_VAR MagneticField_FOUND
+   REQUIRED_VARS SELF_DIR
+   VERSION_VAR MagneticField_VERSION )
+
+# Clean up.
+unset( SELF_DIR )