Index: cmake/modules/GetHostTriple.cmake
===================================================================
--- cmake/modules/GetHostTriple.cmake
+++ cmake/modules/GetHostTriple.cmake
@@ -3,9 +3,19 @@
 
 function( get_host_triple var )
   if( MSVC )
-    if( CMAKE_CL_64 )
+    execute_process(
+      COMMAND ${CMAKE_CXX_COMPILER}
+      OUTPUT_VARIABLE CL_OUTPUT
+      ERROR_VARIABLE CL_ERROR)
+    STRING(REGEX REPLACE "Microsoft \\(R\\).* for (x64|x86|ARM).*"
+                         "\\1" 
+                         CL_TARGET_ARCHITECTURE
+                         ${CL_ERROR})
+    if ( "${CL_TARGET_ARCHITECTURE}" STREQUAL "x64" )
       set( value "x86_64-pc-win32" )
-    else()
+    elseif ( "${CL_TARGET_ARCHITECTURE}" STREQUAL "ARM" )
+      set( value "arm-pc-win32" )
+    else ()
       set( value "i686-pc-win32" )
     endif()
   elseif( MINGW AND NOT MSYS )