Undefined reference

[lemonL]

/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_get_device_descriptor’未定义的引用
/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_init’未定义的引用
/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_detach_kernel_driver’未定义的引用
/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_open’未定义的引用
/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_get_device_list’未定义的引用
/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_exit’未定义的引用
/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_get_device’未定义的引用
/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_get_active_config_descriptor’未定义的引用
/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_bulk_transfer’未定义的引用
/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_free_device_list’未定义的引用
/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_claim_interface’未定义的引用
/home/kitty/Guidance-SDK-master/demo/catkin_ws/src/include/libDJI_guidance.so：对‘libusb_free_config_descriptor’未定义的引用
collect2: error: ld returned 1 exit status
CMakeFiles/dji_sdk_node.dir/build.make:519: recipe for target '/home/kitty/Guidance-SDK-master/demo/catkin_ws/devel/lib/dji_sdk/dji_sdk_node' failed
make[2]: *** [/home/kitty/Guidance-SDK-master/demo/catkin_ws/devel/lib/dji_sdk/dji_sdk_node] Error 1
CMakeFiles/Makefile2:707: recipe for target 'CMakeFiles/dji_sdk_node.dir/all' failed
make[1]: *** [CMakeFiles/dji_sdk_node.dir/all] Error 2
Makefile:138: recipe for target 'all' failed
make: *** [all] Error 2
Invoking "make -j4 -l4" failed

[lemonL]

CMakeError.log

Determining if the pthread_create exist failed with the following output:
Change Dir: /home/kitty/Guidance-SDK-master/demo/catkin_ws/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_19694/fast"
/usr/bin/make -f CMakeFiles/cmTC_19694.dir/build.make CMakeFiles/cmTC_19694.dir/build
make[1]: Entering directory '/home/kitty/Guidance-SDK-master/demo/catkin_ws/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_19694.dir/CheckSymbolExists.c.o
/usr/bin/cc -o CMakeFiles/cmTC_19694.dir/CheckSymbolExists.c.o -c /home/kitty/Guidance-SDK-master/demo/catkin_ws/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTC_19694
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_19694.dir/link.txt --verbose=1
/usr/bin/cc CMakeFiles/cmTC_19694.dir/CheckSymbolExists.c.o -o cmTC_19694 -rdynamic
CMakeFiles/cmTC_19694.dir/CheckSymbolExists.c.o：在函数‘main’中：
CheckSymbolExists.c:(.text+0x16)：对‘pthread_create’未定义的引用
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_19694.dir/build.make:97: recipe for target 'cmTC_19694' failed
make[1]: *** [cmTC_19694] Error 1
make[1]: Leaving directory '/home/kitty/Guidance-SDK-master/demo/catkin_ws/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_19694/fast' failed
make: *** [cmTC_19694/fast] Error 2

File /home/kitty/Guidance-SDK-master/demo/catkin_ws/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <pthread.h>

int main(int argc, char** argv)
{
(void)argv;
#ifndef pthread_create
return ((int*)(&pthread_create))[argc];
#else
(void)argc;
return 0;
#endif
}

Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: /home/kitty/Guidance-SDK-master/demo/catkin_ws/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_71697/fast"
/usr/bin/make -f CMakeFiles/cmTC_71697.dir/build.make CMakeFiles/cmTC_71697.dir/build
make[1]: Entering directory '/home/kitty/Guidance-SDK-master/demo/catkin_ws/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_71697.dir/CheckFunctionExists.c.o
/usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create -o CMakeFiles/cmTC_71697.dir/CheckFunctionExists.c.o -c /usr/share/cmake-3.5/Modules/CheckFunctionExists.c
Linking C executable cmTC_71697
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_71697.dir/link.txt --verbose=1
/usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create CMakeFiles/cmTC_71697.dir/CheckFunctionExists.c.o -o cmTC_71697 -rdynamic -lpthreads
/usr/bin/ld: 找不到 -lpthreads
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_71697.dir/build.make:97: recipe for target 'cmTC_71697' failed
make[1]: *** [cmTC_71697] Error 1
make[1]: Leaving directory '/home/kitty/Guidance-SDK-master/demo/catkin_ws/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_71697/fast' failed
make: *** [cmTC_71697/fast] Error 2

[seanavery]

I am having this same issue @lemonL. Were you able to get around it?