virtual destructors

[Jessica Han]

I have a simple testcase test.C
class base_class
{
 public:
 virtual void showmanyc () { };
 virtual ~base_class(){};
 virtual void underflow(){};
};

int main(){
 base_class A;
}

If I compile it with aCC on IPF HPUX, I get the vtable for base_class looks
like:
vtable for base_class:: data1   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00
        data4.ua typeinfo for base_class
        data1   0x00, 0x00, 0x00, 0x00
        data16.ua @iplt(base_class::showmanyc())
        data16.ua @iplt(base_class::underflow())
        data16.ua @iplt(base_class::~base_class [in-charge]())
        data16.ua @iplt(base_class::~base_class [in-charge deleting]())

If I compile it with gcc on the same machine, I get the following vtable:
vtable for base_class:
        data4   0
        data4   0
        data4   typeinfo for base_class#
        data4   0
        data8.ua @iplt(base_class::showmanyc()#)
        data8.ua 0
        data8.ua @iplt(base_class::~base_class [in-charge]()#)
        data8.ua 0
        data8.ua @iplt(base_class::~base_class [in-charge deleting]()#)
        data8.ua 0
        data8.ua @iplt(base_class::underflow()#)
        data8.ua 0

aCC always puts virtual destructors at the bottom of the vtable, but g++
puts them in the order of its definition. What is the right order of
function descriptors? Since I already declared base_class::~base_class, it
is not implicitly-defined virtual destructor, right?
Thanks.

----
Jessica Han
Open Source Tools
Hewlett-Packard
(408) 447-6154