[Bug middle-end/54809] gengtype ignore mark_hook in struct nested in union

[bstarynk at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54809

--- Comment #1 from Basile Starynkevitch <bstarynk at gcc dot gnu.org> 2012-10-04 08:05:00 UTC ---
Created attachment 28354
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28354
patch to gengtype.c