// See https://golang.org/issue/22735
	/*
		// Write the sparse map and setup the sparse writer if necessary.
		if len(spd) > 0 {
			// Use tw.curr since the sparse map is accounted for in hdr.Size.
			if _, err := tw.curr.Write(spb); err != nil {
				return err
			}
			tw.curr = &sparseFileWriter{tw.curr, spd, 0}
		}
	*/
	return nil
}

		// arguments from C to Go. The C and Go definitions
		// just have to agree. The gcc struct will be compiled
		// with __attribute__((packed)) so all padding must be
		// accounted for explicitly.
		ctype := "struct {\n"
		gotype := new(bytes.Buffer)
		fmt.Fprintf(gotype, "struct {\n")
		off := int64(0)
		npad := 0
		argField := func(typ ast.Expr, namePat string, args ...interface{}) {