GDB的使用

1. GDB install

yum install gdb

gdb --version

2. GDB debug

gdb main                   //debug main

list                       //view the code, enter to continue. list "function name" to view the function code

break n                    //set break point on specified line "n"

info breakpoints           //view all breakpoints information

disable/clear "breakn"     //disable or clear breakpoint "n"
delete                     //delete all breakpoints

run                        //run the program           
continue                   //run until next breakpoint or end of the program
next/n                     //next statement
print i                    //print variable or statement
quit                       //quit debug

step                       //step into
next                       //step over
finish                     //step out

3. 遇到no debugging symbols found的问题，需要在编译选项中加入-g：
   g++ -g -Wall -std=c++11 main.cpp StrVec.cpp -o main
   Reference:
   https://www.cnblogs.com/kingos/p/4514756.html
   https://blog.youkuaiyun.com/haoel/article/details/2879
   https://blog.youkuaiyun.com/wu_cai_/article/details/79669842