Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output: Change Dir: /home/giuliobenetti/autobuild/run/instance-2/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_57eeb/fast && make[1]: Entering directory '/home/giuliobenetti/autobuild/run/instance-2/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_57eeb.dir/build.make CMakeFiles/cmTC_57eeb.dir/build make[2]: Entering directory '/home/giuliobenetti/autobuild/run/instance-2/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_57eeb.dir/src.c.o /home/giuliobenetti/autobuild/run/instance-2/output-1/host/bin/aarch64_be-linux-gnu-gcc --sysroot=/home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-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_57eeb.dir/src.c.o -c /home/giuliobenetti/autobuild/run/instance-2/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp/src.c Linking C executable cmTC_57eeb /home/giuliobenetti/autobuild/run/instance-2/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_57eeb.dir/link.txt --verbose=1 /home/giuliobenetti/autobuild/run/instance-2/output-1/host/bin/aarch64_be-linux-gnu-gcc --sysroot=/home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCMAKE_HAVE_LIBC_PTHREAD -DNDEBUG CMakeFiles/cmTC_57eeb.dir/src.c.o -o cmTC_57eeb /home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-buildroot-linux-gnu/sysroot/usr/lib/libssl.so /home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-buildroot-linux-gnu/sysroot/usr/lib/libcrypto.so /home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-buildroot-linux-gnu/sysroot/usr/lib/libssh.so /home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-buildroot-linux-gnu/sysroot/usr/lib/libnetconf2.so /home/giuliobenetti/autobuild/run/instance-2/output-1/host/opt/ext-toolchain/bin/../lib/gcc/aarch64_be-linux-gnu/7.3.1/../../../../aarch64_be-linux-gnu/bin/ld: CMakeFiles/cmTC_57eeb.dir/src.c.o: undefined reference to symbol 'pthread_join@@GLIBC_2.17' /home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-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_57eeb.dir/build.make:91: cmTC_57eeb] Error 1 make[2]: Leaving directory '/home/giuliobenetti/autobuild/run/instance-2/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:121: cmTC_57eeb/fast] Error 2 make[1]: Leaving directory '/home/giuliobenetti/autobuild/run/instance-2/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: /home/giuliobenetti/autobuild/run/instance-2/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_c3168/fast && make[1]: Entering directory '/home/giuliobenetti/autobuild/run/instance-2/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_c3168.dir/build.make CMakeFiles/cmTC_c3168.dir/build make[2]: Entering directory '/home/giuliobenetti/autobuild/run/instance-2/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_c3168.dir/CheckFunctionExists.c.o /home/giuliobenetti/autobuild/run/instance-2/output-1/host/bin/aarch64_be-linux-gnu-gcc --sysroot=/home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-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_c3168.dir/CheckFunctionExists.c.o -c /home/giuliobenetti/autobuild/run/instance-2/output-1/host/share/cmake-3.15/Modules/CheckFunctionExists.c Linking C executable cmTC_c3168 /home/giuliobenetti/autobuild/run/instance-2/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_c3168.dir/link.txt --verbose=1 /home/giuliobenetti/autobuild/run/instance-2/output-1/host/bin/aarch64_be-linux-gnu-gcc --sysroot=/home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create -DNDEBUG CMakeFiles/cmTC_c3168.dir/CheckFunctionExists.c.o -o cmTC_c3168 -lpthreads /home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-buildroot-linux-gnu/sysroot/usr/lib/libssl.so /home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-buildroot-linux-gnu/sysroot/usr/lib/libcrypto.so /home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-buildroot-linux-gnu/sysroot/usr/lib/libssh.so /home/giuliobenetti/autobuild/run/instance-2/output-1/host/aarch64_be-buildroot-linux-gnu/sysroot/usr/lib/libnetconf2.so /home/giuliobenetti/autobuild/run/instance-2/output-1/host/opt/ext-toolchain/bin/../lib/gcc/aarch64_be-linux-gnu/7.3.1/../../../../aarch64_be-linux-gnu/bin/ld: cannot find -lpthreads collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/cmTC_c3168.dir/build.make:91: cmTC_c3168] Error 1 make[2]: Leaving directory '/home/giuliobenetti/autobuild/run/instance-2/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:121: cmTC_c3168/fast] Error 2 make[1]: Leaving directory '/home/giuliobenetti/autobuild/run/instance-2/output-1/build/netopeer2-1.1.53/CMakeFiles/CMakeTmp'