catkin_make error (about opencv)

[wang19950602]

Hello, I got a little problem with catkin_make. I use ubuntu 14.04 , ROS:indigo , gcc version 4.8.4 When running 'catkin_make -DCMAKE_BUILD_TYPE=Release',I encounter a problem: The result shows that undefined reference to several opencv functions. May I ask you how to fix this problem? Thank you

[floft]

In src/darknet_ros/darknet_ros/CMakeLists.txt: find the target_link_libraries and add ${OpenCV_LIBS} to the list (src)

Edit: Nope. Don't do that. That ends up seg faulting?

[floft]

Okay, so I'm on indigo and this appears to work:

cd src/
git clone https://github.com/superjax/cv3_bridge

In src/darknet_ros/darknet_ros/CMakeLists.txt:

• find the cv_bridge and replace with cv3_bridge
• find the find_package(OpenCV REQUIRED) and change to find_package(OpenCV 3 REQUIRED)
• find the target_link_libraries(${PROJECT_NAME} ... and add ${OpenCV_LIBRARIES} to the end of the list

[Achllle]

The fix by @floft worked on Kinetic, you have to additionally go into package.xml in darknet_ros and change cv_bridge to cv3_bridge.

[joyyang1215]

Add ${OpenCV_LIBS} and it works. Thanks!

[araster1010]

I have same problem as you. I tried cv3_bridge, but it doesn't work.

In the CMakelists.txt, there are 4 target_link_libraries. Should I add ${OpenCV_LIBS} all of them?

Could you tell me more detail about this?

[mbjelonic]

You can have a look in the CMakeLists.txt of the branch devel/threads. I fixed it there. I will also merge this branch soon because the detection is much faster on this branch.

On 21 Jan 2018, at 03:27, araster1010 notifications@github.com wrote:

I have same problem as you. I tried cv3_bridge, but it doesn't work.

In the CMakelists.txt, there are 4 target_link_libraries. Should I add ${OpenCV_LIBS} all of them?

Could you tell me more detail about this?

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[mbjelonic]

Merged the branch devel/threads.