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2020-06-03 09:55:21 -0500	received badge	● Nice Question (source)
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2016-02-25 14:33:47 -0500	commented answer	Potential Field navigation implementation in ROS ? Link is broken
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2016-02-17 10:07:12 -0500	answered a question	Undefined reference to ros::init Even though this was a new workspace, I created another one from scratch. In the workspace I was working in at the time, I originally had the CMakeList lines out of order. Running `catkin_make clean` didn't have an affect on my issue. After creating a new workspace, I copied the random_walk folder that is verbatim to what I have posted above and the problem magically vanished. `mkdir -p ~/test_space/src cd ~/test_space/src/ catkin_init_workspace cd .. catkin_make # /opt/ros/indigo/setup.bash already sourced in .bashrc source devel/setup.bash cp -r ~/other_wksp_path/src/random_walk ./src/ catkin_make random_walk`
2016-02-17 09:57:01 -0500	commented question	Undefined reference to ros::init Maybe so. I originally had the CMakeList lines in the wrong order. I had hoped `catkin_make clean` would have fixed that.
2016-02-17 01:13:53 -0500	received badge	● Notable Question (source)
2016-02-16 21:53:54 -0500	commented question	Undefined reference to ros::init I built a new workspace from scratch (again). I can't think of anything I did differently this time than last, but I can no longer reproduce the issue. Should this question be closed or deleted?
2016-02-16 20:50:04 -0500	commented question	Undefined reference to ros::init @lucasw I added the verbose output, not exactly sure what I'm looking for. Interesting note, this project was in a new workspace I created; I tried again in the workspace I created in the tutorials and it worked. I went back through the tutorials and have yet to find anything missing.
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2016-02-15 12:24:34 -0500	asked a question	Undefined reference to ros::init Most of the similar questions pointed to the package's CMakeList.txt . As far as I can tell, it's as it should be: `cmake_minimum_required(VERSION 2.8.3) project(random_walk) find_package(catkin REQUIRED COMPONENTS roscpp geometry_msgs sensor_msgs ) message("catkin libraries" ${catkin_LIBRARIES}) catkin_package() include_directories(include ${catkin_INCLUDE_DIRS}) add_executable(random_walk src/random_walk.cpp) target_link_libraries(random_walk ${catkin_LIBRARIES}) add_dependencies(random_walk beginner_tutorials_generate_messages_cpp)` Packages.xml has the dependencies `<buildtool_depend>catkin</buildtool_depend> <build_depend>roscpp</build_depend> <build_depend>geometry_msgs</build_depend> <build_depend>sensor_msgs</build_depend> <run_depend>roscpp</run_depend> <run_depend>geometry_msgs</run_depend> <run_depend>sensor_msgs</run_depend>` Rosdep said all dependencies are installed. I performed a clean prior to trying to make, but I can't compile something as simple as: `#include "ros/ros.h" int main (int argc, char argv ) { ros::init(argc, argv, "random_walk"); }` Without seeing In function `main': random_walk.cpp:(.text+0x46): undefined reference to`ros::init(int&, char, std::string const&, unsigned int)' This source says "If you see errors from catkin_make that the header ros/ros.h cannot be found, or “undefined reference” errors on ros::init or other ROS functions, the most likely reason is that your CMakeLists.txt does not correctly declare a dependency on roscpp." I can't figure out what I'm missing. Any ideas? Verbose Output of Make /usr/bin/cmake -H/home/gary/catkin_ws/src -B/home/gary/catkin_ws/build --check-build-system CMakeFiles/Makefile.cmake 0 make -f CMakeFiles/Makefile2 random_walk make[1]: Entering directory `/home/gary/catkin_ws/build' /usr/bin/cmake -H/home/gary/catkin_ws/src -B/home/gary/catkin_ws/build --check-build-system CMakeFiles/Makefile.cmake 0 /usr/bin/cmake -E cmake_progress_start /home/gary/catkin_ws/build/CMakeFiles 1 make -f CMakeFiles/Makefile2 random_walk/CMakeFiles/random_walk.dir/all make[2]: Entering directory `/home/gary/catkin_ws/build' make -f random_walk/CMakeFiles/random_walk.dir/build.make random_walk/CMakeFiles/random_walk.dir/depend make[3]: Entering directory `/home/gary/catkin_ws/build' cd /home/gary/catkin_ws/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/gary/catkin_ws/src /home/gary/catkin_ws/src/random_walk /home/gary/catkin_ws/build /home/gary/catkin_ws/build/random_walk /home/gary/catkin_ws/build/random_walk/CMakeFiles/random_walk.dir/DependInfo.cmake --color= make[3]: Leaving directory `/home/gary/catkin_ws/build' make -f random_walk/CMakeFiles/random_walk.dir/build.make random_walk/CMakeFiles/random_walk.dir/build make[3]: Entering directory `/home/gary/catkin_ws/build' Linking CXX executable /home/gary/catkin_ws/devel/lib/random_walk/random_walk cd /home/gary/catkin_ws/build/random_walk && /usr/bin/cmake -E cmake_link_script CMakeFiles/random_walk.dir/link.txt --verbose=1 /usr/bin/c++ CMakeFiles/random_walk.dir/src/random_walk.cpp.o -o /home/gary/catkin_ws/devel/lib/random_walk/random_walk -rdynamic /opt/ros/indigo/lib/libroscpp_serialization.so /opt/ros/indigo/lib/librostime.so -lboost_date_time /opt/ros/indigo/lib/libcpp_common.so -lboost_system -lboost_thread -lpthread -lconsole_bridge -Wl,-rpath,/opt/ros/indigo/lib CMakeFiles/random_walk.dir/src/random_walk.cpp.o: In function `main': random_walk.cpp:(.text+0x46): undefined reference to `ros::init(int&, char, std::string const&, unsigned int)' collect2: error: ld returned 1 exit status make[3]: * [/home/gary/catkin_ws/devel/lib/random_walk/random_walk] Error 1 make[3]: Leaving directory `/home/gary/catkin_ws/build ... (more)