title: xcconfig file -- set a variable value with a leading space?
body: <p>Suppose I want to define the value of an environment variable BAR to be " foo", without the quotes.  If my .xcconfig file has the line</p>
  
  <pre><code>BAR = foo
  </code></pre>
  
  <p>that will set it to "foo".  Same goes if it has the line</p>
  
  <pre><code>BAR =  foo
  </code></pre>
  
  <p>Is there a way to do what I want?</p>