title: GCC 5 ABI change
body: <p>Fedora <a href="http://fedoramagazine.org/gcc-5-in-fedora-whats-an-abi-and-what-happens-when-we-change-it/" rel="nofollow">announced</a> that they might plan on shipping GCC 5 with the new ABI turned off by default. As I understand it, Fedora 22 will continue to use the old ABI and Fedora 23 will use the new ABI. Programs would have to be recompiled in mass quantity.</p>
  
  <p>My question is what does the C++11 standard change from C++03 that breaks ABI compatibility? </p>