Hello,

I'm using ROS2 Humble on Ubuntu 22 for x64 and I have a package that is autogenerating header files for some custom messages I have made. I need to use those headers in another custom ros2bag package but Cmake is giving me issues when trying to include and link to the custom headers.

Package A (with autogenerated headers):

cmake_minimum_required(VERSION 3.8)
project(ads1115_ros_driver)

if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  add_compile_options(-Wall -Wextra -Wpedantic)
endif()

include_directories(include)

# find dependencies
find_package(ament_cmake REQUIRED)
find_package(rclcpp REQUIRED)
find_package(std_msgs REQUIRED)
find_package(rosidl_default_generators REQUIRED)

rosidl_generate_interfaces(${PROJECT_NAME}
  "msg/Ads1115.msg"  # Add packages that above messages depend on, in this case geometry_msgs for Sphere.msg
)
add_executable(ads1115_ros_node src/ads1115_ros_node.cpp src/ads1115_rpi.c) 

ament_target_dependencies(ads1115_ros_node rclcpp std_msgs)

rosidl_get_typesupport_target(cpp_typesupport_target
  ${PROJECT_NAME} rosidl_typesupport_cpp
)

message("${cpp_typesupport_target}")
target_link_libraries(ads1115_ros_node "${cpp_typesupport_target}")

ament_export_dependencies(rosidl_default_runtime
  std_msgs )

ament_export_targets(ads1115_ros_node HAS_LIBRARY_TARGET)

install(
  TARGETS ads1115_ros_node
  EXPORT ads1115_ros_node
  LIBRARY DESTINATION lib
  ARCHIVE DESTINATION lib
  RUNTIME DESTINATION bin
  INCLUDES DESTINATION include)

if(BUILD_TESTING)
  find_package(ament_lint_auto REQUIRED)
  # the following line skips the linter which checks for copyrights
  # comment the line when a copyright and license is added to all source files
  set(ament_cmake_copyright_FOUND TRUE)
  # the following line skips cpplint (only works in a git repo)
  # comment the line when this package is in a git repo and when
  # a copyright and license is added to all source files
  set(ament_cmake_cpplint_FOUND TRUE)
  ament_lint_auto_find_test_dependencies()
endif()

ament_package()

Package B which uses header generated above:

cmake_minimum_required(VERSION 3.8)
project(data_aggregator)

if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  add_compile_options(-Wall -Wextra -Wpedantic)
endif()

#Default to C++17
if(NOT CMAKE_CXX_STANDARD)
  set(CMAKE_CXX_STANDARD 17)
endif()

# Default to C99
if(NOT CMAKE_C_STANDARD)
  set(CMAKE_C_STANDARD 99)
endif()

# find dependencies)
find_package(ament_cmake REQUIRED)
find_package(rclcpp REQUIRED)
find_package(rosbag2_cpp REQUIRED)
find_package(ads1115_ros_driver REQUIRED)

include_directories(include)
include_directories(include ../../install/ads1115_ros_driver/include/ads1115_ros_driver/)
add_executable(data_aggregator_node src/data_aggregator_node.cpp)
target_include_directories(data_aggregator_node PUBLIC
  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
  $<INSTALL_INTERFACE:include>)
ament_target_dependencies(data_aggregator_node  rclcpp std_msgs rosbag2_cpp "ads1115_ros_driver")
target_link_libraries(data_aggregator_node rosbag2_cpp::rosbag2_cpp rclcpp::rclcpp 
   ads1115_ros_driver::msg::Ads1115)
#rosidl_get_typesupport_target(cpp_typesupport_target ${PROJECT_NAME} "rosidl_typesupport_cpp")
# uncomment the following section in order to fill in
# further dependencies manually.
# find_package(<dependency> REQUIRED)



install(TARGETS
data_aggregator_node
  DESTINATION lib/${PROJECT_NAME})


if(BUILD_TESTING)
  find_package(ament_lint_auto REQUIRED)
  # the following line skips the linter which checks for copyrights
  # comment the line when a copyright and license is added to all source files
  set(ament_cmake_copyright_FOUND TRUE)
  # the following line skips cpplint (only works in a git repo)
  # comment the line when this package is in a git repo and when
  # a copyright and license is added to all source files
  set(ament_cmake_cpplint_FOUND TRUE)
  ament_lint_auto_find_test_dependencies()
endif()

ament_package()

The beginning of the bag recorder cpp file looks like:

#include <memory>

#include "ads1115_ros_driver/msg/ads1115.hpp"
#include "rclcpp/rclcpp.hpp"

#include "rosbag2_cpp/writer.hpp"

And the error I get is:

CMake Error at CMakeLists.txt:26 (add_executable):
  Target "data_aggregator_node" links to target
  "ads1115_ros_driver::msg::Ads1115" but the target was not found.  Perhaps a
  find_package() call is missing for an IMPORTED target, or an ALIAS target
  is missing?

Please help! Thanks

include_directories(include)
include_directories(include ../../install/ads1115_ros_driver/include/ads1115_ros_driver/)
add_executable(data_aggregator_node src/data_aggregator_node.cpp)
target_include_directories(data_aggregator_node PUBLIC
  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
  $<INSTALL_INTERFACE:include>)
ament_target_dependencies(data_aggregator_node  rclcpp std_msgs rosbag2_cpp )
target_link_libraries(data_aggregator_node rosbag2_cpp::rosbag2_cpp rclcpp::rclcpp )

include_directories(include)
include_directories(include ../../install/ads1115_ros_driver/include/ads1115_ros_driver/)
add_executable(data_aggregator_node src/data_aggregator_node.cpp)
target_include_directories(data_aggregator_node PUBLIC
  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
  $<INSTALL_INTERFACE:include>)
ament_target_dependencies(data_aggregator_node  rclcpp std_msgs rosbag2_cpp)
target_link_directories(data_aggregator_node PRIVATE ../../install/ads1115_ros_driver/lib)
target_link_libraries(data_aggregator_node rosbag2_cpp::rosbag2_cpp rclcpp::rclcpp ads1115_ros_driver__rosidl_typesupport_cpp)