[gentoo-user] What's up with the "hardened" USE flag?

[Nikos Chantziaras]

After syncing, some heavy packages wanted to rebuild because of the 
"hardened" USE flag.  (I don't use the hardened profile, but they wanted 
to rebuild anyway.)  Really heavy stuff including libreoffice and 
firefox-5.  It took a few hours.  Then, next resync, and the same 
packages want to rebuild again because of the "hardened" USE flag :-/

Anyone else getting this?  These are big packages needing hours to get 
built.