https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62306
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- You could e.g. implement the dtors as: _Z...D0...: set some hard reg to 0 tail call some function _Z...D1...: set some hard reg to 1 tail call some function _Z...D2...: set some hard reg to 2 tail call some function and that function would just have a magic extra argument, if the same in between all levels would not use it at all, otherwise could e.g. have if (extra == 0) delete ...; at the end, etc. My memory is fuzzy on it after all the years, but as the comdat names are part of the ABI, I think the idea was to allow implementations to choose how to implement it while staying interoperable. So, if g++ 4.[569]/5 emit it in D5, I think that is how it was meant, and what should be done.
