s := ctxt.loader.LookupOrCreateSym(".machosymstr", 0)
	sb := ctxt.loader.MakeSymbolUpdater(s)

	sb.SetType(sym.SMACHOSYMSTR)
	sb.SetReachable(true)
	sb.AddUint8(' ')
	sb.AddUint8('\x00')

	s = ctxt.loader.LookupOrCreateSym(".machosymtab", 0)
	sb = ctxt.loader.MakeSymbolUpdater(s)
	sb.SetType(sym.SMACHOSYMTAB)
	sb.SetReachable(true)

	if ctxt.IsInternal() {

				if d.ctxt.Debugvlog > 1 {
					d.ctxt.Logf("deadcode: %s rewrite %s ref to %s\n",
						d.ldr.SymName(idx), rsn,
						d.ldr.SymName(d.mapinitnoop))
				}
				if su == nil {
					su = d.ldr.MakeSymbolUpdater(idx)
				}
				su.SetRelocSym(i, d.mapinitnoop)
			}
		}
	}
}

func (d *deadcodePass) mark(symIdx, parent loader.Sym) {
	if symIdx != 0 && !d.ldr.AttrReachable(symIdx) {
		d.wq.push(symIdx)