export targets in a addition to include directories / libraries (#1088)

Signed-off-by: Dirk Thomas <dirk-thomas@users.noreply.github.com>

rclcpp/CMakeLists.txt

@@ -26,8 +26,6 @@ if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   add_compile_options(-Wall -Wextra -Wpedantic)
 endif()
 
-include_directories(include)
-
 set(${PROJECT_NAME}_SRCS
   src/rclcpp/any_executable.cpp
   src/rclcpp/callback_group.cpp
@@ -160,10 +158,12 @@ foreach(interface_file ${interface_files})
     include/rclcpp/node_interfaces/get_${interface_name}.hpp)
 endforeach()
 
-include_directories("${CMAKE_CURRENT_BINARY_DIR}/include")
-
 add_library(${PROJECT_NAME}
   ${${PROJECT_NAME}_SRCS})
+target_include_directories(${PROJECT_NAME} PUBLIC
+  "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>"
+  "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>"
+  "$<INSTALL_INTERFACE:include>")
 # specific order: dependents before dependencies
 ament_target_dependencies(${PROJECT_NAME}
   "libstatistics_collector"
@@ -185,7 +185,7 @@ target_compile_definitions(${PROJECT_NAME}
   PRIVATE "RCLCPP_BUILDING_LIBRARY")
 
 install(
-  TARGETS ${PROJECT_NAME}
+  TARGETS ${PROJECT_NAME} EXPORT ${PROJECT_NAME}
   ARCHIVE DESTINATION lib
   LIBRARY DESTINATION lib
   RUNTIME DESTINATION bin
@@ -194,6 +194,7 @@ install(
 # specific order: dependents before dependencies
 ament_export_include_directories(include)
 ament_export_libraries(${PROJECT_NAME})
+ament_export_targets(${PROJECT_NAME})
 
 ament_export_dependencies(libstatistics_collector)
 ament_export_dependencies(rcl)
@@ -255,6 +256,7 @@ if(BUILD_TESTING)
   endif()
   ament_add_gtest(test_function_traits test/test_function_traits.cpp)
   if(TARGET test_function_traits)
+    target_include_directories(test_function_traits PUBLIC include)
     ament_target_dependencies(test_function_traits
       "rcl_interfaces"
       "rmw"