Prior to 3.12 cmake silently created an empty destination directory if the origin of the copy_directory does not exist.

--- test/TokenizerTest/CMakeLists.txt.orig	2007-09-16 09:33:38 UTC
+++ test/TokenizerTest/CMakeLists.txt
@@ -7,5 +7,6 @@ ADD_DEPENDENCIES(TokenizerTest ${PODOFO_
 ADD_CUSTOM_COMMAND(
     TARGET TokenizerTest
     POST_BUILD
+    COMMAND "${CMAKE_COMMAND}" -E make_directory "${CMAKE_CURRENT_SOURCE_DIR}/objects"
     COMMAND "${CMAKE_COMMAND}" -E copy_directory "${CMAKE_CURRENT_SOURCE_DIR}/objects" "${CMAKE_CURRENT_BINARY_DIR}/objects"
     )