Index: compiler-rt/lib/builtins/CMakeLists.txt
===================================================================
--- compiler-rt/lib/builtins/CMakeLists.txt
+++ compiler-rt/lib/builtins/CMakeLists.txt
@@ -516,26 +516,28 @@
 set(OA_HELPERS_DIR "${CMAKE_CURRENT_BINARY_DIR}/outline_atomic_helpers.dir")
 file(MAKE_DIRECTORY ${OA_HELPERS_DIR})
 
-foreach(pat cas swp ldadd ldclr ldeor ldset)
-  foreach(size 1 2 4 8 16)
-    foreach(model 1 2 3 4)
-      if(pat STREQUAL "cas" OR NOT size STREQUAL "16")
-        set(helper_asm ${OA_HELPERS_DIR}/outline_atomic_${pat}${size}_${model}.S)
-        add_custom_command(
-          OUTPUT ${helper_asm}
-          COMMAND ${CMAKE_C_COMPILER} -E ${CUSTOM_FLAGS} -DL_${pat} -DSIZE=${size} -DMODEL=${model}
-                  ${CMAKE_CURRENT_SOURCE_DIR}/aarch64/lse.S -o ${helper_asm}
-          DEPENDS aarch64/lse.S assembly.h
-        )
-        set_source_files_properties(${helper_asm} PROPERTIES GENERATED TRUE)
-        set(aarch64_SOURCES
-          ${aarch64_SOURCES}
-          ${helper_asm}
-        )
-      endif()
-    endforeach(model)
-  endforeach(size)
-endforeach(pat)
+if(NOT APPLE AND NOT WIN32)
+  foreach(pat cas swp ldadd ldclr ldeor ldset)
+    foreach(size 1 2 4 8 16)
+      foreach(model 1 2 3 4)
+        if(pat STREQUAL "cas" OR NOT size STREQUAL "16")
+          set(helper_asm ${OA_HELPERS_DIR}/outline_atomic_${pat}${size}_${model}.S)
+          add_custom_command(
+            OUTPUT ${helper_asm}
+            COMMAND ${CMAKE_C_COMPILER} -E ${CUSTOM_FLAGS} -DL_${pat} -DSIZE=${size} -DMODEL=${model}
+                    ${CMAKE_CURRENT_SOURCE_DIR}/aarch64/lse.S -o ${helper_asm}
+            DEPENDS aarch64/lse.S assembly.h
+          )
+          set_source_files_properties(${helper_asm} PROPERTIES GENERATED TRUE)
+          set(aarch64_SOURCES
+            ${aarch64_SOURCES}
+            ${helper_asm}
+          )
+        endif()
+      endforeach(model)
+    endforeach(size)
+  endforeach(pat)
+endif()
 
 if (MINGW)
   set(aarch64_SOURCES