title: How to print without newline in CMake?
body: <p>It's all in the title. The <a href="https://cmake.org/cmake/help/v3.11/command/message.html" rel="noreferrer">message documentation</a> does not propose any option to do so, but is there really no way to write some text using CMake without having it silently add a newline?</p>
  
  <p>The idea is to print something like "Adding library...", and later print "Done" but keeping both messages on the same line;</p>