gcc 3.0.1 & C++ ABI issues

[Jason Merrill]

>>>>> "Nathan" == Nathan Sidwell <nathan@codesourcery.com> writes:

> Jason Merrill wrote:
>> 
>> >>>>> "Mark" == Mark Mitchell <mark@codesourcery.com> writes:
>> 
>> > What do you think we should do in the 3.0.1 time frame?  Can we get
>> > a reasonably safe patch that will fix the correctness issue and
>> > not cause the (minor) pessimization?  (This would clearly be the
>> > ideal solution.)
>> 
>> I think a patch that just disables the optimization for the case of copying
>> an lvalue of empty class type would be fine for 3.0.1.

> This is insufficient. I attach a test case where we assign a
> temporary into an empy base, and clobber what it overlays.

Yes, your change to the assignment case is good; I was only thinking about
initialization.  The case I still want to optimize is the case of
initializing an empty class object from a temporary.

Jason