Brushing up on CMake (Targets.cmake and Config.cmake)

CMakeLists.txt

@@ -35,55 +35,60 @@ project(Metall
         DESCRIPTION "A persistent memory allocator for data-centric analytics"
         HOMEPAGE_URL "https://github.com/LLNL/metall")
 
-configure_file(MetallConfig.h.in MetallConfig.h)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+set(CMAKE_CXX_EXTENSIONS OFF)
 
 # ----- Setting up a INTERFACE library to install header files ----- #
 include(GNUInstallDirs)
 add_library(${PROJECT_NAME} INTERFACE)
 add_library(${PROJECT_NAME}::${PROJECT_NAME} ALIAS ${PROJECT_NAME})
 target_include_directories(${PROJECT_NAME}
-        INTERFACE $<BUILD_INTERFACE:${${PROJECT_NAME}_SOURCE_DIR}/include>
+        INTERFACE $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
         $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
 
-set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_CXX_STANDARD_REQUIRED True)
-set(CMAKE_CXX_EXTENSIONS OFF)
-
+# Generate MetallTargets.cmake file
 install(TARGETS ${PROJECT_NAME}
-        EXPORT ${PROJECT_NAME}_Targets
-        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
-
-install(EXPORT ${PROJECT_NAME}_Targets
+        EXPORT ${PROJECT_NAME}Targets
+        DESTINATION ${CMAKE_INSTALL_LIBDIR})
+# install MetallTargets.cmake
+install(EXPORT ${PROJECT_NAME}Targets
         FILE ${PROJECT_NAME}Targets.cmake
         NAMESPACE ${PROJECT_NAME}::
-        DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/${PROJECT_NAME}/cmake)
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME})
 
+# Install header files
 install(DIRECTORY ${PROJECT_SOURCE_DIR}/include/metall DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 
 # -------------------------------------------------------------------------------- #
 # Generate and install the package configuration and package version files
 # -------------------------------------------------------------------------------- #
 include(CMakePackageConfigHelpers)
 
-# generate the version file for the config file
-write_basic_package_version_file(
-        "${PROJECT_NAME}ConfigVersion.cmake"
-        VERSION ${PROJECT_VERSION}
-        COMPATIBILITY ExactVersion)
-
-# create config file
+# Generate config file
 configure_package_config_file(
         "${PROJECT_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake.in"
         "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
-        INSTALL_DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/${PROJECT_NAME}/cmake)
+        INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME}
+        NO_SET_AND_CHECK_MACRO
+        NO_CHECK_REQUIRED_COMPONENTS_MACRO)
 
-# install config files
+# Generate the version file for the config file
+write_basic_package_version_file(
+        "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
+        VERSION ${PROJECT_VERSION}
+        COMPATIBILITY ExactVersion)
+
+# Install the config and version files
 install(FILES
         "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
         "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
-        DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/${PROJECT_NAME}/cmake)
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME})
+
+# Make this project to also be used from a build directory
+export(EXPORT ${PROJECT_NAME}Targets
+        FILE "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Targets.cmake"
+)
 # -------------------------------------------------------------------------------- #