diff --git a/llvm/runtimes/CMakeLists.txt b/llvm/runtimes/CMakeLists.txt
--- a/llvm/runtimes/CMakeLists.txt
+++ b/llvm/runtimes/CMakeLists.txt
@@ -462,14 +462,16 @@
         list(APPEND ${name}_extra_args "-D${new_name}=${new_value}")
       endif()
     endforeach()
-    foreach(variableName ${variableNames})
-      string(FIND "${variableName}" "RUNTIMES_${name}_" out)
-      if("${out}" EQUAL 0)
-        string(REPLACE "RUNTIMES_${name}_" "" new_name ${variableName})
-        string(REPLACE ";" "|" new_value "${${variableName}}")
-        list(APPEND ${name}_extra_args "-D${new_name}=${new_value}")
-      endif()
-    endforeach()
+    if(NOT "${name}" STREQUAL "${target}")
+      foreach(variableName ${variableNames})
+        string(FIND "${variableName}" "RUNTIMES_${name}_" out)
+        if("${out}" EQUAL 0)
+          string(REPLACE "RUNTIMES_${name}_" "" new_name ${variableName})
+          string(REPLACE ";" "|" new_value "${${variableName}}")
+          list(APPEND ${name}_extra_args "-D${new_name}=${new_value}")
+        endif()
+      endforeach()
+    endif()
 
     if(NOT RUNTIMES_${name}_LLVM_ENABLE_RUNTIMES AND NOT RUNTIMES_${target}_LLVM_ENABLE_RUNTIMES)
       string(REPLACE ";" "|" LLVM_ENABLE_RUNTIMES_PASSTHROUGH "${LLVM_ENABLE_RUNTIMES}")