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 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 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; }