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-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_fd1a6/fast && gmake[1]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp'
/usr/bin/gmake -f CMakeFiles/cmTC_fd1a6.dir/build.make CMakeFiles/cmTC_fd1a6.dir/build
gmake[2]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_fd1a6.dir/src.cxx.o
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/bin/m68k-linux-g++ --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/m68k-buildroot-uclinux-uclibc/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -fno-dwarf2-cfi-asm -Wl,-elf2flt -static -fno-dwarf2-cfi-asm -Wl,-elf2flt -static -DCMAKE_HAVE_LIBC_PTHREAD  -DNDEBUG   -o CMakeFiles/cmTC_fd1a6.dir/src.cxx.o -c /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp/src.cxx
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp/src.cxx: In function 'int main()':
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp/src.cxx:14:3: error: 'pthread_atfork' was not declared in this scope
   pthread_atfork(NULL, NULL, NULL);
   ^~~~~~~~~~~~~~
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp/src.cxx:14:3: note: suggested alternative: 'pthread_attr_t'
   pthread_atfork(NULL, NULL, NULL);
   ^~~~~~~~~~~~~~
   pthread_attr_t
gmake[2]: *** [CMakeFiles/cmTC_fd1a6.dir/src.cxx.o] Error 1
gmake[2]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_fd1a6/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/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_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-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_df086/fast && gmake[1]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp'
/usr/bin/gmake -f CMakeFiles/cmTC_df086.dir/build.make CMakeFiles/cmTC_df086.dir/build
gmake[2]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_df086.dir/CheckFunctionExists.cxx.o
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/bin/m68k-linux-g++ --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/m68k-buildroot-uclinux-uclibc/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -fno-dwarf2-cfi-asm -Wl,-elf2flt -static -fno-dwarf2-cfi-asm -Wl,-elf2flt -static -DCHECK_FUNCTION_EXISTS=pthread_create  -DNDEBUG   -o CMakeFiles/cmTC_df086.dir/CheckFunctionExists.cxx.o -c /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CheckLibraryExists/CheckFunctionExists.cxx
Linking CXX executable cmTC_df086
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_df086.dir/link.txt --verbose=1
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/bin/m68k-linux-g++ --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/m68k-buildroot-uclinux-uclibc/sysroot  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -fno-dwarf2-cfi-asm -Wl,-elf2flt -static -fno-dwarf2-cfi-asm -Wl,-elf2flt -static -DCHECK_FUNCTION_EXISTS=pthread_create  -DNDEBUG  -Wl,-elf2flt -static  CMakeFiles/cmTC_df086.dir/CheckFunctionExists.cxx.o  -o cmTC_df086 -lpthreads 
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/opt/ext-toolchain/m68k-buildroot-uclinux-uclibc/bin/ld.real: cannot find -lpthreads
collect2: error: ld returned 1 exit status
gmake[2]: *** [cmTC_df086] Error 1
gmake[2]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_df086/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp'



Determining if the include file execinfo.h exists failed with the following output:
Change Dir: /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_76e20/fast && gmake[1]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp'
/usr/bin/gmake -f CMakeFiles/cmTC_76e20.dir/build.make CMakeFiles/cmTC_76e20.dir/build
gmake[2]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_76e20.dir/CheckIncludeFile.cxx.o
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/bin/m68k-linux-g++ --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/m68k-buildroot-uclinux-uclibc/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -fno-dwarf2-cfi-asm -Wl,-elf2flt -static -fno-dwarf2-cfi-asm -Wl,-elf2flt -static   -DNDEBUG   -o CMakeFiles/cmTC_76e20.dir/CheckIncludeFile.cxx.o -c /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp/CheckIncludeFile.cxx
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp/CheckIncludeFile.cxx:1:10: fatal error: execinfo.h: No such file or directory
 #include <execinfo.h>
          ^~~~~~~~~~~~
compilation terminated.
gmake[2]: *** [CMakeFiles/cmTC_76e20.dir/CheckIncludeFile.cxx.o] Error 1
gmake[2]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_76e20/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/libabseil-cpp-20200225/CMakeFiles/CMakeTmp'