title: D_FORTIFY_SOURCE=2 option does not work for me
body: <p>I saw that GCC 4.5 and above versions should support –D_FORTIFY_SOURCE=2 option. But it does not work for me, it has been ignred and it does not report issues when i used.</p>
  
  <p>Compiler version used is "g++.c4.5.3-p0", Will it ignore the option?</p>