fixup: install for downstream packages

CMakeLists.txt

@@ -11,9 +11,17 @@ endif(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CXX_FLAGS)
 
 option(CMAKE_VERBOSE_MAKEFILE "Generate verbose Makefiles" OFF)
 include(GNUInstallDirs)
+include(CMakePackageConfigHelpers)
 
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 
+write_basic_package_version_file("CabanaPDConfigVersion.cmake"
+  VERSION ${PROJECT_VERSION} COMPATIBILITY SameMajorVersion)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/CabanaPD_Config.cmakein
+  ${CMAKE_CURRENT_BINARY_DIR}/CabanaPDConfig.cmake @ONLY)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/CabanaPDConfig.cmake ${CMAKE_CURRENT_BINARY_DIR}/CabanaPDConfigVersion.cmake
+  DESTINATION ${CMAKE_INSTALL_DATADIR}/cmake/CabanaPD)
+
 ##---------------------------------------------------------------------------##
 # Set up main options (inherit from Kokkos and Cabana CMake)
 ##---------------------------------------------------------------------------##
@@ -34,6 +42,7 @@ if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.24")
 endif()
 find_package(nlohmann_json 3.10.0 QUIET)
 if(NOT NLOHMANN_JSON_FOUND)
+  set(CabanaPD_INTERNAL_JSON ON)
   include(FetchContent)
   # Using most recent release here
   FetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.11.2/json.tar.xz)

cmake/CabanaPD_Config.cmakein

@@ -1,4 +1,8 @@
 include(CMakeFindDependencyMacro)
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}" )
 list(APPEND CMAKE_PREFIX_PATH @CMAKE_PREFIX_PATH@)
-find_dependency(Cabana REQUIRED)
+find_dependency(Cabana REQUIRED COMPONENTS Core Grid)
+if(NOT CabanaPD_INTERNAL_JSON)
+  find_dependency(nlohmann_json REQUIRED)
+endif()
+include("${CMAKE_CURRENT_LIST_DIR}/CabanaPD_Targets.cmake")

src/CMakeLists.txt

@@ -8,11 +8,28 @@ install(FILES ${FORCE_HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/force)
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/CabanaPD_config.hpp DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 
 add_library(CabanaPD INTERFACE)
+add_library(CabanaPD::CabanaPD ALIAS CabanaPD)
 
-target_include_directories(CabanaPD INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}
+target_include_directories(CabanaPD INTERFACE 
+                           $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
                            $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
                            $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>)
 
 target_link_libraries(CabanaPD INTERFACE Cabana::Core Cabana::Grid nlohmann_json::nlohmann_json)
 
-install(TARGETS CabanaPD DESTINATION ${CMAKE_INSTALL_LIBDIR})
+install(TARGETS CabanaPD
+        EXPORT CabanaPD_Targets
+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+# In this case we're using an internal copy of json so we need to install for downstream use.
+if(CabanaPD_INTERNAL_JSON)
+  install(TARGETS nlohmann_json
+          EXPORT CabanaPD_Targets
+          LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+          ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+endif()
+
+install(EXPORT CabanaPD_Targets
+  FILE CabanaPD_Targets.cmake
+  NAMESPACE CabanaPD::
+  DESTINATION ${CMAKE_INSTALL_DATADIR}/cmake/CabanaPD)