[Bug libstdc++/80721] Sorting/Merging of free EH-emergency buffer may wrong or uncomplete

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80721

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-05-12
                 CC|                            |rguenth at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  Isn't it enough to add, after

      else if (reinterpret_cast <char *> (e) + sz
               == reinterpret_cast <char *> (first_free_entry))
        {
...

a

      else if (reinterpret_cast <char *> (e)
               < reinterpret_cast <char *> (first_free_entry))
        {
          // First is right of us, replace the head.
          free_entry *f = reinterpret_cast <free_entry *> (e);
          new (f) free_entry;
          f->next = first_free_entry;
          first_free_entry = f;
        }

?  That's a much less intrusive (and hard to review) fix.