Determining if the pthread_create exist failed with the following output:
Change Dir: /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/gmake" "cmTC_11c8d/fast"
gmake[1]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'
/usr/bin/gmake -f CMakeFiles/cmTC_11c8d.dir/build.make CMakeFiles/cmTC_11c8d.dir/build
gmake[2]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_11c8d.dir/CheckSymbolExists.c.o
/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/aarch64_be-linux-gnu-gcc --sysroot=/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/aarch64_be-buildroot-linux-gnu/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG   -o CMakeFiles/cmTC_11c8d.dir/CheckSymbolExists.c.o   -c /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTC_11c8d
/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_11c8d.dir/link.txt --verbose=1
/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/aarch64_be-linux-gnu-gcc --sysroot=/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/aarch64_be-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG    -rdynamic CMakeFiles/cmTC_11c8d.dir/CheckSymbolExists.c.o  -o cmTC_11c8d 
CMakeFiles/cmTC_11c8d.dir/CheckSymbolExists.c.o: In function `main':
CheckSymbolExists.c:(.text.startup+0x0): undefined reference to `pthread_create'
CheckSymbolExists.c:(.text.startup+0x4): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
gmake[2]: *** [cmTC_11c8d] Error 1
gmake[2]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_11c8d/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'

File /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <pthread.h>

int main(int argc, char** argv)
{
  (void)argv;
#ifndef pthread_create
  return ((int*)(&pthread_create))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/gmake" "cmTC_d1c52/fast"
gmake[1]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'
/usr/bin/gmake -f CMakeFiles/cmTC_d1c52.dir/build.make CMakeFiles/cmTC_d1c52.dir/build
gmake[2]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_d1c52.dir/CheckFunctionExists.c.o
/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/aarch64_be-linux-gnu-gcc --sysroot=/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/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   -o CMakeFiles/cmTC_d1c52.dir/CheckFunctionExists.c.o   -c /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/share/cmake-3.8/Modules/CheckFunctionExists.c
Linking C executable cmTC_d1c52
/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_d1c52.dir/link.txt --verbose=1
/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/aarch64_be-linux-gnu-gcc --sysroot=/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/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    -rdynamic CMakeFiles/cmTC_d1c52.dir/CheckFunctionExists.c.o  -o cmTC_d1c52 -lpthreads 
/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/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
gmake[2]: *** [cmTC_d1c52] Error 1
gmake[2]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_d1c52/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'


Performing C++ SOURCE FILE Test _SSL_LEAK_SUPPRESS_AVAILABLE failed with the following output:
Change Dir: /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/gmake" "cmTC_2a88e/fast"
gmake[1]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'
/usr/bin/gmake -f CMakeFiles/cmTC_2a88e.dir/build.make CMakeFiles/cmTC_2a88e.dir/build
gmake[2]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_2a88e.dir/src.cxx.o
/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/aarch64_be-linux-gnu-g++ --sysroot=/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/aarch64_be-buildroot-linux-gnu/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os   -latomic -std=c++11 -fno-strict-aliasing -D_SSL_LEAK_SUPPRESS_AVAILABLE  -DNDEBUG   -o CMakeFiles/cmTC_2a88e.dir/src.cxx.o -c /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp/src.cxx
In file included from /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp/src.cxx:2:0:
/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp/src.cxx: In function 'int main()':
/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp/src.cxx:5:9: error: expected id-expression before 'while'
       ::SSL_COMP_free_compression_methods();
         ^
gmake[2]: *** [CMakeFiles/cmTC_2a88e.dir/src.cxx.o] Error 1
gmake[2]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_2a88e/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/libcpprestsdk-v2.10.10/Release/CMakeFiles/CMakeTmp'

Source file was:

      #include <openssl/ssl.h>
      int main()
      {
      ::SSL_COMP_free_compression_methods();
      }