Determining if the pthread_setname_np exist failed with the following output:
Change Dir: /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/gmake" "cmTC_4a161/fast"
gmake[1]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'
/usr/bin/gmake -f CMakeFiles/cmTC_4a161.dir/build.make CMakeFiles/cmTC_4a161.dir/build
gmake[2]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_4a161.dir/CheckSymbolExists.c.o
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/bin/arm-none-linux-gnueabi-gcc --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/arm-buildroot-linux-gnueabi/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG -fPIE   -o CMakeFiles/cmTC_4a161.dir/CheckSymbolExists.c.o   -c /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c: In function 'main':
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: error: 'pthread_setname_np' undeclared (first use in this function)
   return ((int*)(&pthread_setname_np))[argc];
                   ^
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: note: each undeclared identifier is reported only once for each function it appears in
gmake[2]: *** [CMakeFiles/cmTC_4a161.dir/CheckSymbolExists.c.o] Error 1
gmake[2]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_4a161/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'

File /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <pthread.h>

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

Determining if the pthread_create exist failed with the following output:
Change Dir: /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/gmake" "cmTC_12a27/fast"
gmake[1]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'
/usr/bin/gmake -f CMakeFiles/cmTC_12a27.dir/build.make CMakeFiles/cmTC_12a27.dir/build
gmake[2]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_12a27.dir/CheckSymbolExists.c.o
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/bin/arm-none-linux-gnueabi-gcc --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/arm-buildroot-linux-gnueabi/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG -fPIE   -o CMakeFiles/cmTC_12a27.dir/CheckSymbolExists.c.o   -c /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTC_12a27
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_12a27.dir/link.txt --verbose=1
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/bin/arm-none-linux-gnueabi-gcc --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/arm-buildroot-linux-gnueabi/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG  -latomic  CMakeFiles/cmTC_12a27.dir/CheckSymbolExists.c.o  -o cmTC_12a27 
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/opt/ext-toolchain/bin/../lib/gcc/arm-none-linux-gnueabi/4.8.3/../../../../arm-none-linux-gnueabi/bin/ld: CMakeFiles/cmTC_12a27.dir/CheckSymbolExists.c.o: undefined reference to symbol 'pthread_create@@GLIBC_2.4'
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/arm-buildroot-linux-gnueabi/sysroot/thumb2/lib/libpthread.so.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
gmake[2]: *** [cmTC_12a27] Error 1
gmake[2]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_12a27/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'

File /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/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/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/gmake" "cmTC_e4096/fast"
gmake[1]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'
/usr/bin/gmake -f CMakeFiles/cmTC_e4096.dir/build.make CMakeFiles/cmTC_e4096.dir/build
gmake[2]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_e4096.dir/CheckFunctionExists.c.o
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/bin/arm-none-linux-gnueabi-gcc --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/arm-buildroot-linux-gnueabi/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create  -DNDEBUG -fPIE   -o CMakeFiles/cmTC_e4096.dir/CheckFunctionExists.c.o   -c /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/share/cmake-3.8/Modules/CheckFunctionExists.c
Linking C executable cmTC_e4096
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_e4096.dir/link.txt --verbose=1
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/bin/arm-none-linux-gnueabi-gcc --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/host/arm-buildroot-linux-gnueabi/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create  -DNDEBUG  -latomic  CMakeFiles/cmTC_e4096.dir/CheckFunctionExists.c.o  -o cmTC_e4096 -lpthreads 
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/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
gmake[2]: *** [cmTC_e4096] Error 1
gmake[2]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_e4096/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output/build/grpc-1.23.0/CMakeFiles/CMakeTmp'