Determining if the pthread_setname_np exist failed with the following output:
Change Dir: /home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make -f Makefile cmTC_010b5/fast && make[1]: Entering directory '/home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_010b5.dir/build.make CMakeFiles/cmTC_010b5.dir/build
make[2]: Entering directory '/home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_010b5.dir/CheckSymbolExists.c.o
/home/buildroot/autobuild/run/instance-2/output-1/host/bin/mips-linux-gnu-gcc --sysroot=/home/buildroot/autobuild/run/instance-2/output-1/host/mips64el-buildroot-linux-gnu/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os -g0 -D_FORTIFY_SOURCE=2   -DNDEBUG -fPIE -o CMakeFiles/cmTC_010b5.dir/CheckSymbolExists.c.o -c /home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c
/home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c: In function 'main':
/home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: error: 'pthread_setname_np' undeclared (first use in this function)
   return ((int*)(&pthread_setname_np))[argc];
                   ^
/home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: note: each undeclared identifier is reported only once for each function it appears in
CMakeFiles/cmTC_010b5.dir/build.make:77: recipe for target 'CMakeFiles/cmTC_010b5.dir/CheckSymbolExists.c.o' failed
make[2]: *** [CMakeFiles/cmTC_010b5.dir/CheckSymbolExists.c.o] Error 1
make[2]: Leaving directory '/home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp'
Makefile:127: recipe for target 'cmTC_010b5/fast' failed
make[1]: *** [cmTC_010b5/fast] Error 2
make[1]: Leaving directory '/home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp'


File /home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/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
}
Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make -f Makefile cmTC_4a311/fast && make[1]: Entering directory '/home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_4a311.dir/build.make CMakeFiles/cmTC_4a311.dir/build
make[2]: Entering directory '/home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_4a311.dir/src.c.o
/home/buildroot/autobuild/run/instance-2/output-1/host/bin/mips-linux-gnu-gcc --sysroot=/home/buildroot/autobuild/run/instance-2/output-1/host/mips64el-buildroot-linux-gnu/sysroot -DCMAKE_HAVE_LIBC_PTHREAD  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os -g0 -D_FORTIFY_SOURCE=2    -DNDEBUG -fPIE -o CMakeFiles/cmTC_4a311.dir/src.c.o -c /home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTC_4a311
/home/buildroot/autobuild/run/instance-2/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_4a311.dir/link.txt --verbose=1
/home/buildroot/autobuild/run/instance-2/output-1/host/bin/mips-linux-gnu-gcc --sysroot=/home/buildroot/autobuild/run/instance-2/output-1/host/mips64el-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os -g0 -D_FORTIFY_SOURCE=2    -DNDEBUG -latomic  CMakeFiles/cmTC_4a311.dir/src.c.o -o cmTC_4a311 
/home/buildroot/autobuild/run/instance-2/output-1/host/opt/ext-toolchain/bin/../lib/gcc/mips-linux-gnu/5.3.0/../../../../mips-linux-gnu/bin/ld: CMakeFiles/cmTC_4a311.dir/src.c.o: undefined reference to symbol 'pthread_detach@@GLIBC_2.0'
/home/buildroot/autobuild/run/instance-2/output-1/host/mips64el-buildroot-linux-gnu/sysroot/soft-float/el/lib64/libpthread.so.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_4a311.dir/build.make:98: recipe for target 'cmTC_4a311' failed
make[2]: *** [cmTC_4a311] Error 1
make[2]: Leaving directory '/home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp'
Makefile:127: recipe for target 'cmTC_4a311/fast' failed
make[1]: *** [cmTC_4a311/fast] Error 2
make[1]: Leaving directory '/home/buildroot/autobuild/run/instance-2/output-1/build/grpc-1.50.0/CMakeFiles/CMakeTmp'


Source file was:
#include <pthread.h>

static 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;
}