title: How to rebuild android source code after making changes in android source files
body: <p>I have android source code in my system and it works fine. But when i make some changes in android source files and run "make" it doesn't generate/update any files
  Please correct me if i am wrong, </p>
  
  <p>i) system should generate a new system.img file if changes have been made to its source code </p>
  
  <p>ii) android kernel file-zImage file doesn't change with any change even if we make any changes to the source code</p>
  
  <p>Another question if i create a new library folder inside /libcore it gets automatically picked up when compiling. For creating a new library folder outside /libcore i added its path in /build/core/main.mk and .classpath file. Still its not getting picked up during compilation. Can someone please confirm where all we have to make changes for adding a new library file outside /libcore</p>
  
  <p>Regards,
  Yogesh</p>