diff --git a/llvm/runtimes/CMakeLists.txt b/llvm/runtimes/CMakeLists.txt
--- a/llvm/runtimes/CMakeLists.txt
+++ b/llvm/runtimes/CMakeLists.txt
@@ -256,14 +256,6 @@
   function(builtin_register_target compiler_rt_path target)
     cmake_parse_arguments(ARG "" "" "DEPENDS" ${ARGN})
 
-    string(REPLACE "-" ";" builtin_target_list ${target})
-    foreach(item ${builtin_target_list})
-      string(TOLOWER "${item}" item_lower)
-      if(item_lower MATCHES "darwin")
-        message(FATAL_ERROR "LLVM_BUILTIN_TARGETS isn't implemented for Darwin platform!")
-      endif()
-    endforeach()
-
     get_cmake_property(variableNames VARIABLES)
     foreach(variableName ${variableNames})
       string(FIND "${variableName}" "BUILTINS_${target}" out)