Drupal + Zephir
Small test merging some function from Drupal with Zephir
/drupal includes the directory for the Drupal 7.34 include files as well as a module for testing the functions that has been ported
/scripts includes the source code files for Zephir
/compare has a file that you can setup and run via cli or the website to compare two drupal instances (I use this with Jenkins for testing)
Read more here: http://www.drupaldare.com/compiled-drupal-core-zephir and here https://groups.drupal.org/node/456053