ardupilot_sitl build error with ROS 2 about ardupilot_gz HOT 10 CLOSED

Can you please contribute a docs PR?
I'm lost on how you skipped that step. We've had a bunch of people skip it, and I am not sure how to improve it.

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This is probably for @srmainwaring or @Ryanf55 to answer.

I'm sure you've seen it but hopefully you've got the ArduPilot build environment installed on the PC as well. https://ardupilot.org/dev/docs/building-the-code.html

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Are you sure there isn't more log data? Normally, in a failure, you get messages on what failed.

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Please delete the build, log, and install folder. Then rebuild.
Finally, zip up the entire contents of your log folder and attach it here. I want to look at everything.
https://colcon.readthedocs.io/en/released/user/log-files.html#log-files

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@aarsht7 the top level colcon messages are not that helpful - basically telling you a package failed to build and not much else. There are flags you can set to provide more detail --event-handlers console_direct+.

In this case the problem is the core ardupilot library as a colcon package. You can build this directly using ./waf as follows:

• Change to ~/ros_ws/src/ardupilot
• Configure: ./waf configure --board sitl --debug --enable-dds
• Build: ./waf build

I suspect you may be missing a dependency, possibly the path to the microxrceddsgen binary.

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Are you sure there isn't more log data? Normally, in a failure, you get messages on what failed.

On the colcon build logs, there is no log data of ardupilot_sitl as pkg is not built
But there is config.log inside src/ardupilot/build
After analyzing it, I realized that the $PATH variable it is not the same as the one in the current env. Maybe it is catching the old one and not updating when I rebuild without removing the ardupilot build directory.

So I tried rm -rf src/ardupilot/build build/ install/ log/ and rebuild
This time it does update to the correct path to the microxrcedds_gen, But the error remains the same.

Also, I forgot to mention one more error, so I have updated the issue.

There are flags you can set to provide more detail --event-handlers console_direct+.

@srmainwaring
Here is the output of the build using the flag. (I have only put the error output and not the entire build log here)

you need to install pexpect with 'python -m pip install pexpect'
gmake[2]: *** [CMakeFiles/ardupilot_build.dir/build.make:70: CMakeFiles/ardupilot_build] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:168: CMakeFiles/ardupilot_build.dir/all] Error 2
gmake: *** [Makefile:146: all] Error 2

So I installed pexpect and tried again. This time, it was missing the future module. So I repeat the procedure after installing it and now I can see big red blocks across the screen.

Here is a pastebin link of the log
Error starts from L82
And build fail logs from L418

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@aarsht7 did you install microxrceddsgen from the ArduPilot fork (https://github.com/ArduPilot/Micro-XRCE-DDS-Gen)? The error you are seeing is because the eProsima version does not support the additional flag reported in the errors.

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did you install microxrceddsgen from the ArduPilot fork

No, I did not. I used the docs from eProsima when I faced the error the first time.
I tried with the fork, and ardupilot_sitl builds without error.

Error with pkg microxrcedds_agent persist

It seems pkg is not required as I run colcon build --packages-up-to ardupilot_gz_bringup, that pkg is not build.
Closing the issue from my side.
Thank you pointing to the fork 🙌🏼

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Also, please review this change too:
ArduPilot/ardupilot_wiki#5887

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Can you please contribute a docs PR?

ArduPilot/ardupilot_wiki#5888

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