Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output: Change Dir: /tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_c7221/fast && make[1]: Entering directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_c7221.dir/build.make CMakeFiles/cmTC_c7221.dir/build make[2]: Entering directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_c7221.dir/src.c.o /tmp/instance-0/output-1/host/bin/arm-none-linux-gnueabi-gcc --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabi/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCMAKE_HAVE_LIBC_PTHREAD -DNDEBUG -o CMakeFiles/cmTC_c7221.dir/src.c.o -c /tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp/src.c Linking C executable cmTC_c7221 /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_c7221.dir/link.txt --verbose=1 /tmp/instance-0/output-1/host/bin/arm-none-linux-gnueabi-gcc --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabi/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCMAKE_HAVE_LIBC_PTHREAD -DNDEBUG CMakeFiles/cmTC_c7221.dir/src.c.o -o cmTC_c7221 CMakeFiles/cmTC_c7221.dir/src.c.o: In function `main': src.c:(.text.startup+0x10): undefined reference to `pthread_create' src.c:(.text.startup+0x16): undefined reference to `pthread_detach' src.c:(.text.startup+0x1e): undefined reference to `pthread_join' src.c:(.text.startup+0x28): undefined reference to `pthread_atfork' collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/cmTC_c7221.dir/build.make:87: cmTC_c7221] Error 1 make[2]: Leaving directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:121: cmTC_c7221/fast] Error 2 make[1]: Leaving directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/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/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_4a913/fast && make[1]: Entering directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_4a913.dir/build.make CMakeFiles/cmTC_4a913.dir/build make[2]: Entering directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_4a913.dir/CheckFunctionExists.c.o /tmp/instance-0/output-1/host/bin/arm-none-linux-gnueabi-gcc --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabi/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create -DNDEBUG -o CMakeFiles/cmTC_4a913.dir/CheckFunctionExists.c.o -c /usr/share/cmake-3.16/Modules/CheckFunctionExists.c Linking C executable cmTC_4a913 /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_4a913.dir/link.txt --verbose=1 /tmp/instance-0/output-1/host/bin/arm-none-linux-gnueabi-gcc --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabi/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create -DNDEBUG CMakeFiles/cmTC_4a913.dir/CheckFunctionExists.c.o -o cmTC_4a913 -lpthreads /tmp/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-none-linux-gnueabi/4.8.3/../../../../arm-none-linux-gnueabi/bin/ld: cannot find -lpthreads collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/cmTC_4a913.dir/build.make:87: cmTC_4a913] Error 1 make[2]: Leaving directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:121: cmTC_4a913/fast] Error 2 make[1]: Leaving directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp' Performing C SOURCE FILE Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY failed with the following output: Change Dir: /tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_aa1d9/fast && make[1]: Entering directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_aa1d9.dir/build.make CMakeFiles/cmTC_aa1d9.dir/build make[2]: Entering directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_aa1d9.dir/src.c.o /tmp/instance-0/output-1/host/bin/arm-none-linux-gnueabi-gcc --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabi/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCOMPILER_HAS_HIDDEN_INLINE_VISIBILITY -DNDEBUG -fvisibility-inlines-hidden -o CMakeFiles/cmTC_aa1d9.dir/src.c.o -c /tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp/src.c cc1: warning: command line option '-fvisibility-inlines-hidden' is valid for C++/ObjC++ but not for C [enabled by default] Linking C executable cmTC_aa1d9 /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_aa1d9.dir/link.txt --verbose=1 /tmp/instance-0/output-1/host/bin/arm-none-linux-gnueabi-gcc --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabi/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCOMPILER_HAS_HIDDEN_INLINE_VISIBILITY -DNDEBUG CMakeFiles/cmTC_aa1d9.dir/src.c.o -o cmTC_aa1d9 make[2]: Leaving directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp' make[1]: Leaving directory '/tmp/instance-0/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp' Source file was: int main(void) { return 0; }