I try to "make" wallet on Ubuntu 16 and get warnings like this:

masternodeman.cpp: In member function ‘bool CMasternodeMan::GetMasternodeByRank(int, masternode_info_t&, int, int)’:
masternodeman.cpp:713:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (vecMasternodeScores.size() < nRankIn)
                                    ^
At global scope:
cc1plus: warning: unrecognized command line option ‘-Wno-implicit-fallthrough’
cc1plus: warning: unrecognized command line option ‘-Wno-self-assign’


1. Is it critical warning? How could i solve it?
2. Which command to start wallt? I try xeon, xeoond, xeoncoin e.t.c

P.S: Sorry for newbie's questions.