Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output: Change Dir: /tmp/instance-0/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_53d66/fast && make[1]: Entering directory '/tmp/instance-0/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_53d66.dir/build.make CMakeFiles/cmTC_53d66.dir/build make[2]: Entering directory '/tmp/instance-0/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_53d66.dir/src.c.o /tmp/instance-0/output-1/per-package/netopeer2/host/bin/aarch64-none-linux-gnu-gcc --sysroot=/tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot -D_GNU_SOURCE -D_POSIX_C_SOURCE=200809L -D__BSD_VISIBLE=1 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCMAKE_HAVE_LIBC_PTHREAD -DNDEBUG -o CMakeFiles/cmTC_53d66.dir/src.c.o -c /tmp/instance-0/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp/src.c Linking C executable cmTC_53d66 /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_53d66.dir/link.txt --verbose=1 /tmp/instance-0/output-1/per-package/netopeer2/host/bin/aarch64-none-linux-gnu-gcc --sysroot=/tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCMAKE_HAVE_LIBC_PTHREAD -DNDEBUG CMakeFiles/cmTC_53d66.dir/src.c.o -o cmTC_53d66 /tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libssl.so /tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libcrypto.so /tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libssh.so /tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libnetconf2.so /tmp/instance-0/output-1/per-package/netopeer2/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-none-linux-gnu/9.2.1/../../../../aarch64-none-linux-gnu/bin/ld: CMakeFiles/cmTC_53d66.dir/src.c.o: undefined reference to symbol 'pthread_join@@GLIBC_2.17' /tmp/instance-0/output-1/per-package/netopeer2/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-none-linux-gnu/9.2.1/../../../../aarch64-none-linux-gnu/bin/ld: /tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot/lib64/libpthread.so.0: error adding symbols: DSO missing from command line collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/cmTC_53d66.dir/build.make:91: cmTC_53d66] Error 1 make[2]: Leaving directory '/tmp/instance-0/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:121: cmTC_53d66/fast] Error 2 make[1]: Leaving directory '/tmp/instance-0/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' Source file was: #include 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: /tmp/instance-0/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_0fc60/fast && make[1]: Entering directory '/tmp/instance-0/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_0fc60.dir/build.make CMakeFiles/cmTC_0fc60.dir/build make[2]: Entering directory '/tmp/instance-0/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_0fc60.dir/CheckFunctionExists.c.o /tmp/instance-0/output-1/per-package/netopeer2/host/bin/aarch64-none-linux-gnu-gcc --sysroot=/tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot -D_GNU_SOURCE -D_POSIX_C_SOURCE=200809L -D__BSD_VISIBLE=1 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create -DNDEBUG -o CMakeFiles/cmTC_0fc60.dir/CheckFunctionExists.c.o -c /usr/share/cmake-3.16/Modules/CheckFunctionExists.c Linking C executable cmTC_0fc60 /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_0fc60.dir/link.txt --verbose=1 /tmp/instance-0/output-1/per-package/netopeer2/host/bin/aarch64-none-linux-gnu-gcc --sysroot=/tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create -DNDEBUG CMakeFiles/cmTC_0fc60.dir/CheckFunctionExists.c.o -o cmTC_0fc60 -lpthreads /tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libssl.so /tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libcrypto.so /tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libssh.so /tmp/instance-0/output-1/per-package/netopeer2/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libnetconf2.so /tmp/instance-0/output-1/per-package/netopeer2/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-none-linux-gnu/9.2.1/../../../../aarch64-none-linux-gnu/bin/ld: cannot find -lpthreads collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/cmTC_0fc60.dir/build.make:91: cmTC_0fc60] Error 1 make[2]: Leaving directory '/tmp/instance-0/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:121: cmTC_0fc60/fast] Error 2 make[1]: Leaving directory '/tmp/instance-0/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp'