\version "2.19.13"

{
  \clef "altovarC"
  \once \override Glissando.minimum-length = #10
  \once \override Glissando.springs-and-rods = #ly:spanner::set-spacing-rods
  \once \override Glissando.bound-details.left.Y = #-3.25
  \once \override Glissando.bound-details.right.Y = #-2.75
  \once \override Glissando.bound-details.left.padding = #3.5
  \pitchedTrill c2\startTrillSpan \glissando ~ des
  \once \omit Staff.Flag
  \once \omit Staff.Stem
  \grace {d8} c8\stopTrillSpan r8 
}