ssize_t not declared in this scope

[rosterloh]

Describe the bug
When trying to build micro-ROS-Agent in a ROS 2 source workspace on a Raspberry Pi I get the following errors.

In file included from /home/pi/ros2_galactic/build/micro_ros_agent/agent/src/xrceagent/src/cpp/transport/stream_framing/StreamFramingProtocol.cpp:15:
/home/pi/ros2_galactic/build/micro_ros_agent/agent/src/xrceagent/include/uxr/agent/transport/stream_framing/StreamFramingProtocol.hpp:98:41: error: ‘ssize_t’ was not declared in this scope; did you mean ‘size_t’?
   98 |     using WriteCallback = std::function<ssize_t (
      |                                         ^~~~~~~
      |                                         size_t

To Reproduce
Steps to reproduce the behaviour:

1. Setup build environment as here
2. git clone https://github.com/micro-ROS/micro_ros_msgs.git -b galactic src/uros/micro_ros_msgs
3. git clone https://github.com/micro-ROS/micro-ROS-Agent.git -b galactic src/uros/micro_ros_agent
4. colcon build --install-base /opt/ros/galactic --merge-install --packages-up-to micro_ros_agent --cmake-args "-DUAGENT_BUILD_EXECUTABLE=OFF -DUAGENT_P2P_PROFILE=OFF --no-warn-unused-cli"

Expected behaviour
A successful build.

System information:

• OS: Debian Bullseye 64 bit
• ROS 2 Galactic
• Version galactic

[rosterloh]

[rosterloh]

I think this is related to eProsima/Micro-XRCE-DDS-Agent#297. SuperBuild is using ros2 branch and this fix is in develop

[rosterloh]

Confirmed working when changing https://github.com/micro-ROS/micro-ROS-Agent/blob/galactic/micro_ros_agent/cmake/SuperBuild.cmake#L29 to develop

[AntumArk]

Are you running on RPI3b+ or 4?

[rosterloh]

@AntumArk on a CM 4

[Acuadros95]

Just updated ros2 branch with develop changes, should fix this problem.

[pablogs9]

Please confirm the fix and we will close

[rosterloh]

This will definitely fix it. Happy to close