这篇随时添加内容。
extern的作用 http://www.cnblogs.com/yc_sunniwell/archive/2010/07/14/1777431.html
fragile binary interface problem http://c2.com/cgi/wiki?FragileBinaryInterfaceProblem
c++ GP概述，用于整体把握http://blog.csdn.net/byxdaz/article/details/4633826
extern的作用 http://www.cnblogs.com/yc_sunniwell/archive/2010/07/14/1777431.html
fragile binary interface problem http://c2.com/cgi/wiki?FragileBinaryInterfaceProblem
c++ GP概述，用于整体把握http://blog.csdn.net/byxdaz/article/details/4633826
