title: How to merge two "ar" static libraries into one?
body: <p>I have 2 static Linux libraries, created by <code>ar cr</code>, <code>libabc.a</code> and <code>libxyz.a</code>.<br>
  I want to merge them into one static library <code>libaz.a</code>.<br>
  How can I do this.</p>
  
  <p>I want to create a merged static library,  not to give both libraries to final link of applications.</p>