Determining if the pthread_create exist failed with the following output:
Change Dir: /home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_a11a8/fast"
make[1]: Entering directory '/home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_a11a8.dir/build.make CMakeFiles/cmTC_a11a8.dir/build
make[2]: Entering directory '/home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_a11a8.dir/CheckSymbolExists.c.o
/usr/bin/gcc   -O2 -I/home/buildroot/autobuild/run/instance-0/output/host/include    -o CMakeFiles/cmTC_a11a8.dir/CheckSymbolExists.c.o   -c /home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTC_a11a8
/home/buildroot/autobuild/run/instance-0/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_a11a8.dir/link.txt --verbose=1
/usr/bin/gcc -O2 -I/home/buildroot/autobuild/run/instance-0/output/host/include     -rdynamic CMakeFiles/cmTC_a11a8.dir/CheckSymbolExists.c.o  -o cmTC_a11a8 
CMakeFiles/cmTC_a11a8.dir/CheckSymbolExists.c.o: In function `main':
CheckSymbolExists.c:(.text.startup+0x3): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_a11a8.dir/build.make:97: recipe for target 'cmTC_a11a8' failed
make[2]: *** [cmTC_a11a8] Error 1
make[2]: Leaving directory '/home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_a11a8/fast' failed
make[1]: *** [cmTC_a11a8/fast] Error 2
make[1]: Leaving directory '/home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/CMakeFiles/CMakeTmp'

File /home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/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: /home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_efffd/fast"
make[1]: Entering directory '/home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_efffd.dir/build.make CMakeFiles/cmTC_efffd.dir/build
make[2]: Entering directory '/home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_efffd.dir/CheckFunctionExists.c.o
/usr/bin/gcc   -O2 -I/home/buildroot/autobuild/run/instance-0/output/host/include -DCHECK_FUNCTION_EXISTS=pthread_create   -o CMakeFiles/cmTC_efffd.dir/CheckFunctionExists.c.o   -c /home/buildroot/autobuild/run/instance-0/output/host/share/cmake-3.8/Modules/CheckFunctionExists.c
Linking C executable cmTC_efffd
/home/buildroot/autobuild/run/instance-0/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_efffd.dir/link.txt --verbose=1
/usr/bin/gcc -O2 -I/home/buildroot/autobuild/run/instance-0/output/host/include -DCHECK_FUNCTION_EXISTS=pthread_create    -rdynamic CMakeFiles/cmTC_efffd.dir/CheckFunctionExists.c.o  -o cmTC_efffd -lpthreads 
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_efffd.dir/build.make:97: recipe for target 'cmTC_efffd' failed
make[2]: *** [cmTC_efffd] Error 1
make[2]: Leaving directory '/home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_efffd/fast' failed
make[1]: *** [cmTC_efffd/fast] Error 2
make[1]: Leaving directory '/home/buildroot/autobuild/run/instance-0/output/build/host-thrift-0.12.0/CMakeFiles/CMakeTmp'