Re: [RFC] Add a little IBM XL C++ specific code in dwarf2read.c, to set TYPE_VPTR_FIELDNO and TYPE_VPTR_BASETYPE of a virtual class correctly

[Daniel Jacobowitz <drow@false.org>]

Your computer's date is wrong; please fix that.  I had to go hunting to
see where this message was filed :-)

On Sat, Apr 30, 2005 at 01:53:46PM -0700, Wu Zhou wrote:
> Daniel, 
> 
> As we discussed in a previous thread before, gdb will drop into SEGV
> fault when handling the debug-info of a virtual class which has no
> DW_AT_containing_type attribute.  ARM's RVCT compiler will generate 
> this kind of debuginfo and prone to trigger SEGV error, which you 
> fixed in a big un-cleanuped patch.  IBM's XL compiler will also 
> generate this kind of debuginfo and prone to SEGV error too, on 
> which I posted a small patch based on yours.  
> 
> I see that you are still too busy to look into this.  But maybe we
> could handle this somewhat easily.  My thought is to begin with 
> eliminating the SEGV error first, which only need a small fix.  Then
> we could go on with other parts.  So I post the following IBM XLC++ 
> specific patch, wishing that we could make some progress on this. 
> What is your point on this idea?  If you think it is ok, I could also
> add ARM specific code into this patch.  Please review and comment. 
> Thanks a lot!

I am not the maintainer of this code, so I can't approve patches to it.  
You currently need to speak with Elena about DWARF-2 patches.

I think the change is probably reasonable.  Alternatively, we could
teach GDB not to rely on TYPE_VPTR_FIELDNO and TYPE_VPTR_BASETYPE if
the C++ ABI in use does not require them, which the GNU v3 ABI does
not.  That would also be a good solution.

-- 
Daniel Jacobowitz
CodeSourcery, LLC