Use generator expression to specify target output directory for resources directory

CMakeLists.txt

@@ -98,8 +98,8 @@ endif()
 
 # Copy test resources and create test output directory
 add_custom_command(TARGET xmltest POST_BUILD
-  COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_SOURCE_DIR}/resources ${CMAKE_BINARY_DIR}/resources
-  COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_BINARY_DIR}/resources/out
+  COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_SOURCE_DIR}/resources $<TARGET_FILE_DIR:xmltest>/resources
+  COMMAND ${CMAKE_COMMAND} -E make_directory $<TARGET_FILE_DIR:xmltest>/resources/out
   COMMENT "Configuring xmltest resources directory: ${CMAKE_BINARY_DIR}/resources"
 )