http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49310
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-06-08 13:34:42 UTC --- 10 was the minimal value to get reasonable debug info in some cases (e.g. gcc.dg/guality/), so perhaps 20 is too much and we should go down to the default of 12-15.
