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Re: [patch i386 mingw]: Disallow DW2 unwind for 64-bit and multilib


Kai Tietz wrote:
> 2009/8/25 Jason Merrill <jason@redhat.com>:
>> On 07/24/2009 03:55 AM, Kai Tietz wrote:
>>> 2009/7/24 Arnaud Charlet<charlet@adacore.com>:
>>>> BTW, do you know how hard it would be to get dwarf2 unwind based
>>>> exceptions
>>>> working on 64 bit windows? What are the missing/blocking points?
>>> The major issue is that the current implementation is using code
>>> analysis for finding frame information. This is for x64 even harder
>>> then for x86 as there much more possibilities of prologue entries.
>> How is this different from other x86_64 targets?
>>
>> Jason
>>
> 
> Well, see for this /gcc/config/i386/mingw32.h file
> (MD_UNWIND_SUPPORT), and the header included here for dw2 based
> unwinding, and you will see that this can't be used for 64-bit, for
> sure (config/i386/w32-unwind.h).

  Hopefully your new .pdata support in gas is going to help with that, isn't it?

    cheers,
      DaveK


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