Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_08faf/fast && gmake[1]: Entering directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'
/usr/bin/gmake  -f CMakeFiles/cmTC_08faf.dir/build.make CMakeFiles/cmTC_08faf.dir/build
gmake[2]: Entering directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_08faf.dir/src.c.o
/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/bin/arm-linux-gcc --sysroot=/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/arm-buildroot-linux-gnueabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -DCMAKE_HAVE_LIBC_PTHREAD  -DNDEBUG   -o CMakeFiles/cmTC_08faf.dir/src.c.o   -c /home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTC_08faf
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_08faf.dir/link.txt --verbose=1
/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/bin/arm-linux-gcc --sysroot=/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/arm-buildroot-linux-gnueabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -DCMAKE_HAVE_LIBC_PTHREAD  -DNDEBUG    CMakeFiles/cmTC_08faf.dir/src.c.o  -o cmTC_08faf 
/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-gnueabihf/9.2.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: CMakeFiles/cmTC_08faf.dir/src.c.o: in function `main':
src.c:(.text.startup+0x1c): undefined reference to `pthread_create'
/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-gnueabihf/9.2.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: src.c:(.text.startup+0x24): undefined reference to `pthread_detach'
/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-gnueabihf/9.2.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: src.c:(.text.startup+0x2c): undefined reference to `pthread_cancel'
/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-gnueabihf/9.2.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: src.c:(.text.startup+0x38): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status
gmake[2]: *** [CMakeFiles/cmTC_08faf.dir/build.make:107: cmTC_08faf] Error 1
gmake[2]: Leaving directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'
gmake[1]: *** [Makefile:141: cmTC_08faf/fast] Error 2
gmake[1]: Leaving directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'


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_cancel(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/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_cde26/fast && gmake[1]: Entering directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'
/usr/bin/gmake  -f CMakeFiles/cmTC_cde26.dir/build.make CMakeFiles/cmTC_cde26.dir/build
gmake[2]: Entering directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_cde26.dir/CheckFunctionExists.c.o
/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/bin/arm-linux-gcc --sysroot=/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/arm-buildroot-linux-gnueabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -DCHECK_FUNCTION_EXISTS=pthread_create  -DNDEBUG   -o CMakeFiles/cmTC_cde26.dir/CheckFunctionExists.c.o   -c /usr/share/cmake/Modules/CheckFunctionExists.c
Linking C executable cmTC_cde26
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_cde26.dir/link.txt --verbose=1
/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/bin/arm-linux-gcc --sysroot=/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/arm-buildroot-linux-gnueabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -DCHECK_FUNCTION_EXISTS=pthread_create  -DNDEBUG    CMakeFiles/cmTC_cde26.dir/CheckFunctionExists.c.o  -o cmTC_cde26  -lpthreads 
/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-gnueabihf/9.2.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
gmake[2]: *** [CMakeFiles/cmTC_cde26.dir/build.make:107: cmTC_cde26] Error 1
gmake[2]: Leaving directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'
gmake[1]: *** [Makefile:141: cmTC_cde26/fast] Error 2
gmake[1]: Leaving directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'



Performing C SOURCE FILE Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY failed with the following output:
Change Dir: /home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_cbe81/fast && gmake[1]: Entering directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'
/usr/bin/gmake  -f CMakeFiles/cmTC_cbe81.dir/build.make CMakeFiles/cmTC_cbe81.dir/build
gmake[2]: Entering directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_cbe81.dir/src.c.o
/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/bin/arm-linux-gcc --sysroot=/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/arm-buildroot-linux-gnueabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -DCOMPILER_HAS_HIDDEN_INLINE_VISIBILITY  -DNDEBUG   -fvisibility-inlines-hidden -o CMakeFiles/cmTC_cbe81.dir/src.c.o   -c /home/naourr/work/instance-3/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
Linking C executable cmTC_cbe81
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_cbe81.dir/link.txt --verbose=1
/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/bin/arm-linux-gcc --sysroot=/home/naourr/work/instance-3/output-1/per-package/librtlsdr/host/arm-buildroot-linux-gnueabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -DCOMPILER_HAS_HIDDEN_INLINE_VISIBILITY  -DNDEBUG    CMakeFiles/cmTC_cbe81.dir/src.c.o  -o cmTC_cbe81 
gmake[2]: Leaving directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'
gmake[1]: Leaving directory '/home/naourr/work/instance-3/output-1/build/librtlsdr-d794155ba65796a76cd0a436f9709f4601509320/CMakeFiles/CMakeTmp'


Source file was:
int main(void) { return 0; }