type_size_sort

static int type_size_sort(const struct object_entry *a, const struct
object_entry *b)
{
...
  return a < b ? -1 : (a > b);
}

This does not look valid. the standard says you must not depend on the location:

       [#4] When  the  same  objects  (consisting  of  size  bytes,
       irrespective  of  their  current positions in the array) are
       passed more  than  once  to  the  comparison  function,  the
       results  shall be consistent with one another.  That is, for
       qsort they shall define a total ordering on the  array,  and
       for  bsearch  the  same object shall always compare the same
       way with the key.

M.