Question

Hi guys, I am learning about ROS2 on Windows 10 today. I tried using the command "colcon build --merge-install", as the tutorial said:

From the root of your workspace (~/dev_ws), you can now build your packages using the command:
Windows:
colcon build --merge-install
Windows doesn’t allow long paths, so merge-install will combine all the paths into the install directory.

But the terminal showed "no such command" for colcon.

Any answer or idea will be appreciated!

Asked by songyuc on 2020-04-29 05:29:17 UTC

Answer 1

Just try installing the colcon as

pip install -U colcon-common-extensions

If you meet any error about "Visual Studio", you can run the command below to enter a Visual Studio (VS) environment as,

call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" x86_amd64

Note: the exact path of the files or name of the application can be different on your computer.

Asked by songyuc on 2020-04-29 08:23:14 UTC

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Asked by christophebedard on 2020-04-29 12:48:12 UTC

OK; In fact, I try using the command above, but after running the colcon build --merge-install, there is an error which shows:

Starting >>> turtlesim
--- stderr: turtlesim
Traceback (most recent call last):
File "c:\python37\lib\site-packages\colcon_core\executor_init.py", line 91, in __call_ rc = await self.task(*args, **kwargs)
File "c:\python37\lib\site-packages\colcon_core\task_init.py", line 93, in __call_ return await task_method(*args, **kwargs)
File "c:\python37\lib\site-packages\colcon_ros\task\ament_cmake\build.py", line 72, in build additional_hooks=additional_hooks)
File "c:\python37\lib\site-packages\colcon_cmake\task\cmake\build.py", line 86, in build rc = await self._reconfigure(args, env)
File "c:\python37\lib\site-packages\colcon_cmake\task\cmake\build.py", line 153, in _reconfigure 'VisualStudioVersion is not set, '

Asked by songyuc on 2020-04-30 03:30:00 UTC

RuntimeError: VisualStudioVersion is not set, please run within a Visual Studio Command Prompt.
---
Failed <<< turtlesim [ Exited with code 1 ]
Summary: 0 packages finished [1.17s]
1 package failed: turtlesim
1 package had stderr output: turtlesim
VisualStudioVersion is not set, please run within a Visual Studio Command Prompt.

And do you know how to solve this issue?

Asked by songyuc on 2020-04-30 03:32:52 UTC

The error message is pretty clear. From a quick Google search, I found this: https://answers.ros.org/question/317475/ros2-windows10-colcon-build-fails-on-ros2_example_ws-tutorial/?answer=320193#post-id-320193 Not sure why the Windows installation tutorials don't mention this though.

Asked by christophebedard on 2020-04-30 08:40:25 UTC

actually, it does mention it here: https://index.ros.org/doc/ros2/Tutorials/Colcon-Tutorial/#build-the-workspace

Asked by christophebedard on 2020-04-30 08:41:33 UTC

Thanks for your guide. It seems ROS2 building requires a VS code environment. So, I cannot use my falimilar PyCharm as my ROS IDE, am I right?

Asked by songyuc on 2020-04-30 09:16:43 UTC

Visual Studio, not Visual Studio Code. You can use anything if you execute the command to setup the VS environment (in the solution I linked to above) before executing any colcon command.

Asked by christophebedard on 2020-04-30 09:23:11 UTC

Thanks! The command colcon can run normally now.

But I still met an error as,
Starting >>> turtlesim
[Processing: turtlesim]
Failed <<< turtlesim [ Exited with code 1 ]
Summary: 0 packages finished [35.5s]
1 package failed: turtlesim

And could you please provide me with more guide and help?

Asked by songyuc on 2020-05-04 05:45:44 UTC

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Asked by christophebedard on 2020-05-06 06:58:51 UTC

[ROS2] "no such command" for using "colcon build --merge-install" on Windows 10

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