title: What's the relationship between binutils and gcc?
body: <p>As titled, is <code>binutils</code> contained in <code>gcc</code> for Centos Linux?
  If I install gcc rpm package, is there need to install <code>binutils</code> also?
  What's more, are <code>gcc</code> and <code>g++</code> both installed by default in Centos?</p>