Hello everyone,
I am working my way through the 5 Days ROS course with Python. I am in unit 5 (Services-Client) now. Along the way, I have created dummy packages to do some practice. Now, when I try to build my catkin_ws using catkin_make I get an error. I viewed the file CMakeError.log. However, there was no information as to which one of my packages was responsible for the error. Below is the content of CMakeError.log.
Kind regards, and I look forward to hearing from you soon.
Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /home/user/catkin_ws/build/CMakeFiles/CMakeTmp
Run Build Command(s):/usr/bin/make cmTC_8d8c6/fast && /usr/bin/make -f CMakeFiles/cmTC_8d8c6.dir/build.make CMakeFiles/cmTC_8d8c6.dir/build
make[1]: Entering directory '/home/user/catkin_ws/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_8d8c6.dir/src.c.o
/usr/bin/cc -DCMAKE_HAVE_LIBC_PTHREAD -o CMakeFiles/cmTC_8d8c6.dir/src.c.o -c /home/user/catkin_ws/build/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTC_8d8c6
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_8d8c6.dir/link.txt --verbose=1
/usr/bin/cc -DCMAKE_HAVE_LIBC_PTHREAD -rdynamic CMakeFiles/cmTC_8d8c6.dir/src.c.o -o cmTC_8d8c6
/usr/bin/ld: CMakeFiles/cmTC_8d8c6.dir/src.c.o: in function `main':
src.c:(.text+0x46): undefined reference to `pthread_create'
/usr/bin/ld: src.c:(.text+0x52): undefined reference to `pthread_detach'
/usr/bin/ld: src.c:(.text+0x63): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status
make[1]: *** [CMakeFiles/cmTC_8d8c6.dir/build.make:87: cmTC_8d8c6] Error 1
make[1]: Leaving directory '/home/user/catkin_ws/build/CMakeFiles/CMakeTmp'
make: *** [Makefile:121: cmTC_8d8c6/fast] Error 2
Source file was:
#include <pthread.h>
void* test_func(void* data)
{
return data;
}
int main(void)
{
pthread_t thread;
pthread_create(&thread, NULL, test_func, NULL);
pthread_detach(thread);
pthread_join(thread, NULL);
pthread_atfork(NULL, NULL, NULL);
pthread_exit(NULL);
return 0;
}
Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: /home/user/catkin_ws/build/CMakeFiles/CMakeTmp
Run Build Command(s):/usr/bin/make cmTC_69d2f/fast && /usr/bin/make -f CMakeFiles/cmTC_69d2f.dir/build.make CMakeFiles/cmTC_69d2f.dir/build
make[1]: Entering directory '/home/user/catkin_ws/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_69d2f.dir/CheckFunctionExists.c.o
/usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create -o CMakeFiles/cmTC_69d2f.dir/CheckFunctionExists.c.o -c /usr/share/cmake-3.16/Modules/CheckFunctionExists.c
Linking C executable cmTC_69d2f
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_69d2f.dir/link.txt --verbose=1
/usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create -rdynamic CMakeFiles/cmTC_69d2f.dir/CheckFunctionExists.c.o -o cmTC_69d2f -lpthreads
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
make[1]: *** [CMakeFiles/cmTC_69d2f.dir/build.make:87: cmTC_69d2f] Error 1
make[1]: Leaving directory '/home/user/catkin_ws/build/CMakeFiles/CMakeTmp'
make: *** [Makefile:121: cmTC_69d2f/fast] Error 2