code: func (bu *Binutils) SetTools(config string) {
  	bu.update(func(r *binrep) { initTools(r, config) })
  }
docs: // SetTools processes the contents of the tools option. It
  // expects a set of entries separated by commas; each entry is a pair
  // of the form t:path, where cmd will be used to look only for the
  // tool named t. If t is not specified, the path is searched for all
  // tools.