Index: llvm/trunk/cmake/modules/AddLLVM.cmake
===================================================================
--- llvm/trunk/cmake/modules/AddLLVM.cmake
+++ llvm/trunk/cmake/modules/AddLLVM.cmake
@@ -1682,7 +1682,7 @@
         XCODE_ATTRIBUTE_CODE_SIGN_ENTITLEMENTS ${ARG_ENTITLEMENTS}
       )
     endif()
-  elseif(APPLE)
+  elseif(APPLE AND CMAKE_HOST_SYSTEM_NAME MATCHES APPLE)
     if(NOT CMAKE_CODESIGN)
       set(CMAKE_CODESIGN xcrun codesign)
     endif()