http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58240
--- Comment #2 from shiyan <shiyan2016 at 126 dot com> --- (In reply to Paolo Carlini from comment #1) > I can't reproduce this. Hi, What is your GCC version? I am using gcc4.7.2. My OS information are as below: $lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.10 Release: 12.10 Codename: quantal $uname -a Linux sgeng2-VirtualBox 3.5.0-27-generic #46-Ubuntu SMP Mon Mar 25 20:00:05 UTC 2013 i686 i686 i686 GNU/Linux $ Thanks, Shiyan