Failing to find_package interface packages due to missing target rosidl_typesupport_introspection_cpp

[jacobperron]

Bug report

Required Info:

• Operating System:
  • Ubuntu 20.04
• Installation type:
  • binary
• Version or commit hash:
  • Rolling (d1122a2)
• DDS implementation:
  • N/A
• Client library (if applicable):
  • N/A

Steps to reproduce issue

In an isolated environment, in workspace clone example_interfaces and create a dummy package that depends on it:

mkdir -p repro_ws/src
cd repro_ws
git clone https://github.com/ros2/example_interfaces.git src/example_interfaces
# install dependencies with rosdep
rosdep install --rosdistro rolling --from-paths src -i -y
# install ros2pkg for convenience
sudo apt install ros-rolling-ros2pkg
# create package 'foo' that depends on example_interfaces
ros2 pkg create --destination-directory src --dependencies example_interfaces -- foo

and build the workspace:

colcon build --packages-up-to foo

Expected behavior

Builds without error.

Actual behavior

find_package(example_interfaces REQUIRED) fails when building foo:

Starting >>> foo
--- stderr: foo                          
CMake Error at CMakeLists.txt:10 (find_package):
  Found package configuration file:

    /tmp/repro_ws/install/example_interfaces/share/example_interfaces/cmake/example_interfacesConfig.cmake

  but it set example_interfaces_FOUND to FALSE so package
  "example_interfaces" is considered to be NOT FOUND.  Reason given by
  package:

  The following imported targets are referenced, but are missing:
  example_interfaces::example_interfaces__rosidl_typesupport_introspection_cpp

[jacobperron]

@hidmic I know you've been doing some work recently related to rosidl. Any idea what could be causing this?

Originally noticed this when gazebo_ros_pkgs CI started failing for Rolling, e.g. https://build.ros2.org/job/Rpr__gazebo_ros_pkgs__ubuntu_focal_amd64/77

cc/ @adityapande-1995

[hidmic]

I cannot reproduce from source, so either something wasn't released or there's an issue with debians.

[hidmic]

Alright, yeah, we are missing ros/rosdistro#30236. Without it, we can and do run into this target export ordering issue. FYI @nuclearsandwich, I know we're in the middle of a sync but that PR has to go in or all packages downstream interface packages will break.

[jacobperron]

The sync already happened; we might want to another sync sooner than later to unbreak folks.

[ros-discourse]

This issue has been mentioned on ROS Discourse. There might be relevant details there:

https://discourse.ros.org/t/new-packages-for-ros-2-rolling-ridley-2021-07-15/21401/2

[jacobperron]

With ros/rosdistro#30236 sync'd, this issue is fixed for me!