几个gcc的扩展功能
-finstrument-functions
constructor
destructor
__builtin_return_address
http://linuxgazette.net/151/melinte.html
http://blog.csdn.net/hengshan/article/details/7869472
http://blog.csdn.net/adaptiver/article/details/9001140
http://blog.linux.org.tw/~jserv/archives/001870.html
https://balau82.wordpress.com/2010/10/06/trace-and-profile-function-calls-with-gcc/
http://blog.csdn.net/liglei/article/details/7302778
http://www.ibm.com/developerworks/cn/linux/l-graphvis/
http://www.cnblogs.com/wangkangluo1/archive/2012/07/09/2583228.html
http://blog.csdn.net/hengshan/article/details/7869472
https://gcc.gnu.org/onlinedocs/gcc/Return-Address.html
https://gcc.gnu.org/onlinedocs/gcc-4.3.4/gcc/Code-Gen-Options.html
https://gcc.gnu.org/onlinedocs/gcc-4.3.4/gcc/Function-Attributes.html#Function-Attributes