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Re: [v3] PATCH to libstdc++ for forced unwind handling (c++/28145)

PaweÅ Sikora wrote:
On Thursday 03 of May 2007 16:21:01 Jason Merrill wrote: 
Yes, but due to an oversight when we were designing the ABI, the
destructor needs to be non-pure for it to control the output of the
type_info.


i don't know the type info implementation details but if you need
the destructor body and vtable for __forced_unwind you can add
an empty destructor definition in library still having
pure class declaration without ugly __pure() method.

The goal here is to have the vtable and type_info emitted only in the library. Pure virtuals are not considered for determining where the vtable goes, so we need a non-pure virtual function. This is a flaw in the ABI, but by the time I noticed it it was too late to change.

Jason

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