failed to link lcm library

[Daichou]

enviroment:

• Ubuntu 16.04
• Linux 4.15.0-29-generic

Error Message

I try to install openni2-camera-lcm library.
First, I build lcm from source.
And then,when I build openni2-camera-lcm,I get following error.

[  0%] Built target lcmgen_cpp
[  7%] Built target usb-reset
[  7%] Built target lcmgen_c
[  7%] Built target lcmgen_python
[  7%] Built target lcmgen_java
[ 15%] Building CXX object CMakeFiles/openni2_wrapper.dir/src/openni2_frame_listener.cpp.o
[ 15%] Building CXX object CMakeFiles/openni2_wrapper.dir/src/openni2_device_manager.cpp.o
[ 19%] Building CXX object CMakeFiles/openni2_wrapper.dir/src/openni2_device.cpp.o
Scanning dependencies of target lcmtypes_openni2
[ 23%] Generating ../lcmtypes/java/openni2/images_t.class, ../lcmtypes/java/openni2/image_t.class, ../lcmtypes/java/openni2/image_metadata_t.class
[ 26%] Building C object CMakeFiles/lcmtypes_openni2.dir/lcmtypes/c/lcmtypes/openni2_image_metadata_t.c.o
[ 30%] Building C object CMakeFiles/lcmtypes_openni2.dir/lcmtypes/c/lcmtypes/openni2_image_t.c.o
[ 34%] Building C object CMakeFiles/lcmtypes_openni2.dir/lcmtypes/c/lcmtypes/openni2_images_t.c.o
[ 38%] Linking C static library lib/liblcmtypes_openni2.a
[ 38%] Built target lcmtypes_openni2
warning: [options] bootstrap class path not set in conjunction with -source 1.6
1 warning
[ 42%] Generating lcmtypes_openni2.jar
[ 42%] Built target lcmtypes_openni2_jar
[ 46%] Linking CXX static library lib/libopenni2_wrapper.a
[ 69%] Built target openni2_wrapper
Scanning dependencies of target test-wrapper
Scanning dependencies of target openni2_driver_lib
[ 73%] Building CXX object CMakeFiles/test-wrapper.dir/test/test_wrapper.cpp.o
[ 76%] Building CXX object CMakeFiles/openni2_driver_lib.dir/src/openni2_driver.cpp.o
[ 80%] Linking CXX executable bin/list-devices
[ 84%] Built target list-devices
[ 88%] Linking CXX executable bin/test-wrapper
[ 88%] Built target test-wrapper
[ 92%] Linking CXX static library lib/libopenni2_driver_lib.a
[ 92%] Built target openni2_driver_lib
Scanning dependencies of target openni2-camera-lcm
[ 96%] Building CXX object CMakeFiles/openni2-camera-lcm.dir/ros/openni2_camera_node.cpp.o
[100%] Linking CXX executable bin/openni2-camera-lcm
/usr/bin/ld: cannot find -llcm::lcm
collect2: error: ld returned 1 exit status
CMakeFiles/openni2-camera-lcm.dir/build.make:108: recipe for target 'bin/openni2-camera-lcm' failed
make[2]: *** [bin/openni2-camera-lcm] Error 1
CMakeFiles/Makefile2:105: recipe for target 'CMakeFiles/openni2-camera-lcm.dir/all' failed
make[1]: *** [CMakeFiles/openni2-camera-lcm.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error

Maybe,we sould modify CMakeLists.txt line:72,update target_link_libraries(openni2-camera-lcm lcm:lcm) to target_link_libraries(openni2-camera-lcm lcm) ?

[wxmerkt]

I dont think we have used this with LCM newer than 1.3.1-lts - i.e. before the exported targets were introduced. So if you use LCM master, yes you need to change that line.

[Daichou]

Thanks for your reply.
I will change that line myself.