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Re: [PATCH 2/2] PR debug/63240 Add DWARF representation for C++11 defaulted member function.
- From: Dodji Seketeli <dodji at redhat dot com>
- To: Jason Merrill <jason at redhat dot com>
- Cc: Siva Chandra <sivachandra at google dot com>, Cary Coutant <ccoutant at google dot com>, Mark Wielaard <mjw at redhat dot com>, gcc-patches <gcc-patches at gcc dot gnu dot org>, Jonathan Wakely <jwakely at redhat dot com>
- Date: Tue, 07 Oct 2014 09:24:45 +0200
- Subject: Re: [PATCH 2/2] PR debug/63240 Add DWARF representation for C++11 defaulted member function.
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Jason Merrill <jason@redhat.com> writes:
> On 10/06/2014 08:50 PM, Siva Chandra wrote:
>> On Sat, Oct 4, 2014 at 11:14 AM, Jason Merrill <jason@redhat.com> wrote:
>>> On 10/03/2014 05:41 PM, Siva Chandra wrote:
>>>>
>>>> I understand that knowing whether a copy-ctor or a d-tor has been
>>>> explicitly defaulted is not sufficient to determine the parameter
>>>> passing ABI. However, why is it not necessary? I could be wrong, but
>>>> doesn't the example I have given show that it is necessary?
>>>
>>> An implicitly declared 'tor can also be trivial.
>>
>> But, the question is whether it is required to determine the parameter
>> passing ABI. If there is no special marker to indicate that the user
>> declared 'tor is explicitly defaulted, then GDB could (in the absence
>> of other properties which make the 'tor non-trivial) incorrectly
>> conclude that the the 'tor is user defined, and hence not-trivial.
>
> I've been thinking that we should just mark the 'tor as trivial or not
> directly rather than hint at it.
FWIW, this would be my inclination too. I think it would make the job
of the debug info consumer a lot easier.
Thanks.
--
Dodji