# Revision history [back]

I will take the liberty to guess that your ROS1 and ROS2 new_msgs packages are used only for message generation (do not contain any headers and src files). In that case you can try the following:

ROS2 package.xml:

<?xml version="1.0"?>
<package format="3">
<name>new_msgs</name>
<version>0.0.1</version>
<description>New message defined for ROS2</description>
<maintainer email="cram3r95@gmail.com">root</maintainer>
<author>CGH</author>

<buildtool_depend>ament_cmake</buildtool_depend>

<depend>std_msgs</depend>
<depend>builtin_interfaces</depend>

<build_depend>rosidl_default_generators</build_depend>
<exec_depend>rosidl_default_runtime</exec_depend>

<member_of_group>rosidl_interface_packages</member_of_group>

<export>
<build_type>ament_cmake</build_type>
</export>
</package>


ROS2 CMakeLists.txt:

cmake_minimum_required(VERSION 3.5)
project(new_msgs)

# Default to C++14
if(NOT CMAKE_CXX_STANDARD)
set(CMAKE_CXX_STANDARD 14)
endif()

if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wpedantic") endif() # find dependencies find_package(ament_cmake REQUIRED) find_package(rosidl_default_generators REQUIRED) find_package(std_msgs REQUIRED) find_package(builtin_interfaces REQUIRED) rosidl_generate_interfaces(new_msgs "msg/YoloObstacle.msg" "msg/YoloList.msg" "msg/Header.msg" DEPENDENCIES std_msgs builtin_interfaces ) ament_export_dependencies(rosidl_default_runtime) ament_package()  ROS1 package.xml: <?xml version="1.0"?> <package format="2"> <name>new_msgs</name> <version>0.0.0</version> <description>The new_msgs package</description> <maintainer email="root@todo.todo">root</maintainer> <buildtool_depend>catkin</buildtool_depend> <depend>std_msgs</depend> <depend>sensor_msgs</depend> <build_depend>message_generation</build_depend> <exec_depend>message_runtime</exec_depend> </package>  ROS1 CMakeLists.txt: cmake_minimum_required(VERSION 2.8.3) project(new_msgs) find_package(catkin REQUIRED COMPONENTS sensor_msgs std_msgs message_generation ) add_message_files( FILES Header.msg YoloList.msg YoloObstacle.msg ) generate_messages( DEPENDENCIES sensor_msgs std_msgs ) catkin_package( CATKIN_DEPENDS message_runtime sensor_msgs std_msgs ) include_directories(${catkin_INCLUDE_DIRS}
)


Building the ros1_bridge from source is the more tricky part. Refer to the package documentation for that.