title: Creating an archive with CMake at a location that I choose
body: <p>I'm trying to learn how to create archives with CMake. I wrote this piece of code:</p>
  
  <pre><code>cmake_minimum_required(VERSION 3.5.1)
  project(hello)
  
  message("Creating archieve in: " ${CMAKE_CURRENT_BINARY_DIR})
  message("Source dir is: " ${CMAKE_CURRENT_SOURCE_DIR})
  
  add_executable(hello main.cpp)
  
  
  set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
  add_custom_target(create_tar ALL COMMAND
      ${CMAKE_COMMAND} -E tar "cfvz" "archieve.tgz")
  add_dependencies(create_tar hello)
  </code></pre>
  
  <p>My project structure is like this:
  I have a main folder in which I have a CMakeLists.txt, a main.cpp and a build folder. I go into build and run the cmake file above by 'cmake ..' and then make. My archive is created in the build folder but as you can see I have specified that I want it in the CMAKE_CURRENT_SOURCE_DIR which is along with the main, cmakelists and build folder not in the actual build folder. </p>
  
  <p>Please explain to me why is that happening and how can I make the archive be created in the CMAKE_CURRENT_SOURCE_DIR and not CMAKE_CURRENT_BINARY_DIR. Thanks.</p>