bench.Start("callgraph")
	ctxt.callgraph()

	bench.Start("doStackCheck")
	ctxt.doStackCheck()

	bench.Start("mangleTypeSym")
	ctxt.mangleTypeSym()

	if ctxt.IsELF {
		bench.Start("doelf")
		ctxt.doelf()
	}
	if ctxt.IsDarwin() {
		bench.Start("domacho")
		ctxt.domacho()
	}
	if ctxt.IsWindows() {
		bench.Start("dope")
		ctxt.dope()
		bench.Start("windynrelocsyms")

		s.AddUint8(0)
	}
	// desc + padding
	s.AddBytes(desc)
	for len(s.Data())%4 != 0 {
		s.AddUint8(0)
	}
	s.SetSize(int64(len(s.Data())))
	s.SetAlign(4)
}

func (ctxt *Link) doelf() {
	ldr := ctxt.loader

	/* predefine strings we need for section headers */

	addshstr := func(s string) int {
		off := len(elfshstrdat)
		elfshstrdat = append(elfshstrdat, s...)