title: CMakeLists is not generating so file
body: <p>Following is my CMakeLists.txt file</p>
  
  <blockquote>
    <p>cmake_minimum_required(VERSION 3.4.1)</p>
    
    <p>add_library(
                 native-lib
                 SHARED
                 src/main/cpp/native-lib.cpp )</p>
    
    <p>find_library(
                  log-lib
                  log )</p>
    
    <p>target_link_libraries(
                           native-lib
                           ${log-lib} )</p>
  </blockquote>
  
  <p>I have specified, <code>SHARED</code> in <code>add_library</code> since I want a shared object library.</p>
  
  <p>But it is not giving me the so file.</p>
  
  <p>what am I missing?</p>