cmake HAVE_BUILTIN_STACK_POINTER examples

SwagSoftware/Kisak-Strike thirdparty/gperftools-2.8.1/CMakeLists.txt :377

check_c_source_compiles(
  "int main() { void* sp = __builtin_stack_pointer(); return 0; }"
  HAVE_BUILTIN_STACK_POINTER)