GDB to debug OpenCV in ROS

Question

I used OpenCV in my ROS codebase. I saw a segmentation fault in a function in OpenCV. It may not be a problem in OpenCV, but it'll be helpful for me to debug if I know what exactly the error is.

However, the symbol table is not available:

(gdb) bt full
#0  0x00007ffff633eefe in CvANN_MLP::predict(cv::Mat const&, cv::Mat&) const () from /opt/ros/hydro/lib/libopencv_ml.so.2.4
No symbol table info available.

I have linked OpenCV in the CMakeList.txt.

find_package(OpenCV REQUIRED)
target_link_libraries(agentlib debug ${OpenCV_LIBS})

morynicz · Accepted Answer · 2013-11-26 21:14:31Z

1

If You installed OpenCV and ROS form packages, try to also install -dbg packages. If You built the libraries on Your own, try building them in debug configuration. To set debug version for a CMake project You need to set CMAKE_BUILD_TYPE variable to Debug.

answered Nov 26, 2013 at 21:14

morynicz

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Alexey Reshetnyak · Accepted Answer · 2014-07-22 14:28:52Z

0

Combination cmake -DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo -D CMAKE_BUILD_TYPE=DEBUG successfully appends debug information.

answered Jul 22, 2014 at 14:28

Alexey Reshetnyak

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