当你使用gcc编译，然后发现你的linker (namely ld or lld) fail的时候
`ld -l<path to your lib> --verbose`
(刚才犯了低级错误，把linker写成了loader)
https://stackoverflow.com/questions/16710047/usr-bin-ld-cannot-find-lnameofthelibrary
#systemProgramming