Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output: Change Dir: /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/gmake cmTC_1d9ca/fast && gmake[1]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp' /usr/bin/gmake -f CMakeFiles/cmTC_1d9ca.dir/build.make CMakeFiles/cmTC_1d9ca.dir/build gmake[2]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_1d9ca.dir/src.c.o /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/bin/arm-buildroot-linux-gnueabihf-gcc --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCMAKE_HAVE_LIBC_PTHREAD -DNDEBUG -o CMakeFiles/cmTC_1d9ca.dir/src.c.o -c /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp/src.c Linking C executable cmTC_1d9ca /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_1d9ca.dir/link.txt --verbose=1 /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/bin/arm-buildroot-linux-gnueabihf-gcc --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCMAKE_HAVE_LIBC_PTHREAD -DNDEBUG CMakeFiles/cmTC_1d9ca.dir/src.c.o -o cmTC_1d9ca /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/lib/gcc/arm-buildroot-linux-gnueabihf/9.3.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: CMakeFiles/cmTC_1d9ca.dir/src.c.o: in function `main': src.c:(.text.startup+0x34): undefined reference to `pthread_create' /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/lib/gcc/arm-buildroot-linux-gnueabihf/9.3.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: src.c:(.text.startup+0x3c): undefined reference to `pthread_detach' /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/lib/gcc/arm-buildroot-linux-gnueabihf/9.3.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: src.c:(.text.startup+0x48): undefined reference to `pthread_join' collect2: error: ld returned 1 exit status gmake[2]: *** [cmTC_1d9ca] Error 1 gmake[2]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp' gmake[1]: *** [cmTC_1d9ca/fast] Error 2 gmake[1]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/domoticz-2020.1/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: /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/gmake cmTC_c68bf/fast && gmake[1]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp' /usr/bin/gmake -f CMakeFiles/cmTC_c68bf.dir/build.make CMakeFiles/cmTC_c68bf.dir/build gmake[2]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_c68bf.dir/CheckFunctionExists.c.o /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/bin/arm-buildroot-linux-gnueabihf-gcc --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create -DNDEBUG -o CMakeFiles/cmTC_c68bf.dir/CheckFunctionExists.c.o -c /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/share/cmake-3.15/Modules/CheckFunctionExists.c Linking C executable cmTC_c68bf /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_c68bf.dir/link.txt --verbose=1 /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/bin/arm-buildroot-linux-gnueabihf-gcc --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create -DNDEBUG CMakeFiles/cmTC_c68bf.dir/CheckFunctionExists.c.o -o cmTC_c68bf -lpthreads /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/lib/gcc/arm-buildroot-linux-gnueabihf/9.3.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: cannot find -lpthreads collect2: error: ld returned 1 exit status gmake[2]: *** [cmTC_c68bf] Error 1 gmake[2]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp' gmake[1]: *** [cmTC_c68bf/fast] Error 2 gmake[1]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp'