Determining if the pthread_setname_np exist failed with the following output: Change Dir: /data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/make" "cmTC_38836/fast" make[1]: Entering directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_38836.dir/build.make CMakeFiles/cmTC_38836.dir/build make[2]: Entering directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_38836.dir/CheckSymbolExists.c.o /usr/bin/gcc -O2 -I/data/buildroot/buildroot-test/instance-0/output/host/include -fPIE -o CMakeFiles/cmTC_38836.dir/CheckSymbolExists.c.o -c /data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp/CheckSymbolExists.c /data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp/CheckSymbolExists.c: In function 'main': /data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: error: 'pthread_setname_np' undeclared (first use in this function); did you mean 'pthread_setcanceltype'? 8 | return ((int*)(&pthread_setname_np))[argc]; | ^~~~~~~~~~~~~~~~~~ | pthread_setcanceltype /data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:19: note: each undeclared identifier is reported only once for each function it appears in make[2]: *** [CMakeFiles/cmTC_38836.dir/build.make:66: CMakeFiles/cmTC_38836.dir/CheckSymbolExists.c.o] Error 1 make[2]: Leaving directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:126: cmTC_38836/fast] Error 2 make[1]: Leaving directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp' File /data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp/CheckSymbolExists.c: /* */ #include 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: /data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/make" "cmTC_d68dd/fast" make[1]: Entering directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_d68dd.dir/build.make CMakeFiles/cmTC_d68dd.dir/build make[2]: Entering directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_d68dd.dir/CheckSymbolExists.c.o /usr/bin/gcc -O2 -I/data/buildroot/buildroot-test/instance-0/output/host/include -fPIE -o CMakeFiles/cmTC_d68dd.dir/CheckSymbolExists.c.o -c /data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp/CheckSymbolExists.c Linking C executable cmTC_d68dd /data/buildroot/buildroot-test/instance-0/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_d68dd.dir/link.txt --verbose=1 /usr/bin/gcc -O2 -I/data/buildroot/buildroot-test/instance-0/output/host/include -rdynamic CMakeFiles/cmTC_d68dd.dir/CheckSymbolExists.c.o -o cmTC_d68dd /usr/bin/ld: CMakeFiles/cmTC_d68dd.dir/CheckSymbolExists.c.o: in function `main': CheckSymbolExists.c:(.text.startup+0x3): undefined reference to `pthread_create' collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/cmTC_d68dd.dir/build.make:98: cmTC_d68dd] Error 1 make[2]: Leaving directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:126: cmTC_d68dd/fast] Error 2 make[1]: Leaving directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp' File /data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp/CheckSymbolExists.c: /* */ #include 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: /data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/make" "cmTC_8bfe3/fast" make[1]: Entering directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_8bfe3.dir/build.make CMakeFiles/cmTC_8bfe3.dir/build make[2]: Entering directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_8bfe3.dir/CheckFunctionExists.c.o /usr/bin/gcc -O2 -I/data/buildroot/buildroot-test/instance-0/output/host/include -DCHECK_FUNCTION_EXISTS=pthread_create -fPIE -o CMakeFiles/cmTC_8bfe3.dir/CheckFunctionExists.c.o -c /data/buildroot/buildroot-test/instance-0/output/host/share/cmake-3.8/Modules/CheckFunctionExists.c Linking C executable cmTC_8bfe3 /data/buildroot/buildroot-test/instance-0/output/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_8bfe3.dir/link.txt --verbose=1 /usr/bin/gcc -O2 -I/data/buildroot/buildroot-test/instance-0/output/host/include -DCHECK_FUNCTION_EXISTS=pthread_create -rdynamic CMakeFiles/cmTC_8bfe3.dir/CheckFunctionExists.c.o -o cmTC_8bfe3 -lpthreads /usr/bin/ld: cannot find -lpthreads collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/cmTC_8bfe3.dir/build.make:98: cmTC_8bfe3] Error 1 make[2]: Leaving directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp' make[1]: *** [Makefile:126: cmTC_8bfe3/fast] Error 2 make[1]: Leaving directory '/data/buildroot/buildroot-test/instance-0/output/build/host-grpc-v1.16.1/CMakeFiles/CMakeTmp'