Historic C++ ABI question

[Florian Weimer <fweimer@xxxxxxxxxx>]

Given these definitions

struct base
{
  int a;
  int b;
};

struct plus : base
{
  virtual ~plus();
};

is there a historic C++ ABI which puts the vtable at offset 8 in struct 
plus (after the fields from struct base)?  This must have been before 
the Itanium C++ ABI.

Thanks,
Florian