[llvm] r178722 - Debug Info: according to DWARF 2, FORM_ref_addr the same size as an address on

[Manman Ren]

On Apr 4, 2013, at 12:19 PM, Eric Christopher <echristo at gmail.com> wrote:

>> After talking with Greg, we have to stick with dwarf2 format of ref_addr
>> since our tool chains can only handle that right now. Similar to what we
>> have for llvm-dwarfdump,
>> our tool chains are in the process of migrating to Dwarf4, we handle some
>> Dwarf4 features and may
>> deviate from Dwarf4 when there are incompatibilities.
> 
> Oddly enough we've been using the dwarf4 definition the entire time…
Should we change our version in the CU header from 2 to 4 then?
> 
>> 
>> We don't really want dwarf2 compatibility. If you think it is wrong to use
>> DarwinGDBCompat, do you have any suggestion?
>> 
> 
> I don't know what else to tell you. This is a change to how dwarf
> worked between dwarf2 and dwarf3. If you need to enable some
> compatibility this belongs in a switch between dwarf2 and dwarf3 plus.
> The darwin gdb compatibility level can be used to set dwarf2 by
> default for darwin if you'd like, but ultimately the right way to fix
> this is to start delineating between dwarf 2 and dwarf3+. There just
> aren't any good 10-20 line solutions.

I will enable this for DarwinGDBCompat, once our tool chains start working with
the Dwarf3+ format of ref_addr, I will revert this change. Is that okay with you?

Thanks,
Manman

> 
> -eric

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