ubuntu16.04编译ORBSLAM2问题解决

在编译ubuntu16.04ros包的时候出现以下问题
`/usr/bin/ld: CMakeFiles/RGBD.dir/src/ros_rgbd.cc.o: undefined reference to symbol ‘_ZN5boost6system15system_categoryEv’
/usr/lib/x86_64-linux-gnu/libboost_system.so: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
CMakeFiles/RGBD.dir/build.make:218: recipe for target ‘…/RGBD’ failed
make[2]: *** […/RGBD] Error 1
CMakeFiles/Makefile2:67: recipe for target ‘CMakeFiles/RGBD.dir/all’ failed
make[1]: *** [CMakeFiles/RGBD.dir/all] Error 2
make[1]: *** 正在等待未完成的任务…
/usr/bin/ld: CMakeFiles/Stereo.dir/src/ros_stereo.cc.o: undefined reference to symbol ‘_ZN5boost6system15system_categoryEv’
/usr/lib/x86_64-linux-gnu/libboost_system.so: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
CMakeFiles/Stereo.dir/build.make:218: recipe for target ‘…/Stereo’ failed
make[2]: *** […/Stereo] Error 1
CMakeFiles/Makefile2:104: recipe for target ‘CMakeFiles/Stereo.dir/all’ failed
make[1]: *** [CMakeFiles/Stereo.dir/all] Error 2
Makefile:127: recipe for target ‘all’ failed
make: *** [all] Error 2

出错原因为：libboost_system.so 与libboost_filesystem.so找不到链接目录，首先确认你已经安装boost库，如果没有安装，可以利用apt安装一下，然后利用以下方案尝试，基本问题可以得到解决
1.解决方案为（最简单方法，强烈推荐）


```更改cmake加上一行-lboost_system
set(LIBS ${OpenCV_LIBS}
${EIGEN3_LIBS}
${Pangolin_LIBRARIES}
${PROJECT_SOURCE_DIR}/../../../Thirdparty/DBoW2/lib/libDBoW2.so
${PROJECT_SOURCE_DIR}/../../../Thirdparty/g2o/lib/libg2o.so
${PROJECT_SOURCE_DIR}/../../../lib/libORB_SLAM2.so
-lboost_system
)

2.如果上面方法不奏效，可以尝试手动添加库
locate boost_system
//查找到目录
/usr/lib/x86_64-linux-gnu/libboost_system.a
/usr/lib/x86_64-linux-gnu/libboost_system.so
/usr/lib/x86_64-linux-gnu/libboost_system.so.1.58.0
/usr/local/MATLAB/R2017a/bin/glnxa64/libboost_system.so.1.56.0

locate boost_filesystem
//查找到目录
/usr/lib/x86_64-linux-gnu/libboost_filesystem.a
/usr/lib/x86_64-linux-gnu/libboost_filesystem.so
/usr/lib/x86_64-linux-gnu/libboost_filesystem.so.1.58.0
/usr/local/MATLAB/R2017a/bin/glnxa64/libboost_filesystem.so.1.56.0

将libboost_system.so与libboost_filesystem.so复制到ORB_SLAM2/lib下，并且将ORBSLAM2/Examples/ROS/ORBSLAM2下的Cmakelists.txt中加入库目录，具体为
在`set(LIBS
${OpenCV_LIBS}
${EIGEN3_LIBS}
${Pangolin_LIBRARIES}
${PROJECT_SOURCE_DIR}/../../../Thirdparty/DBoW2/lib/libDBoW2.so
${PROJECT_SOURCE_DIR}/../../../Thirdparty/g2o/lib/libg2o.so
${PROJECT_SOURCE_DIR}/../../../lib/libORB_SLAM2.so`
之后加入`${PROJECT_SOURCE_DIR}/../../../lib/libboost_filesystem.so
${PROJECT_SOURCE_DIR}/../../../lib/libboost_system.so`
问题得以解决

[ 0%] Built target rospack_genmsg_libexe
[ 0%] Built target rosbuild_precompile
[ 11%] Linking CXX executable …/Mono
[ 22%] Linking CXX executable …/RGBD
[ 33%] Linking CXX executable …/Stereo
[ 44%] Linking CXX executable …/MonoAR
[ 55%] Built target Mono
[ 66%] Built target RGBD
[ 77%] Built target Stereo
[100%] Built target MonoAR

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