Hello.

As you like to point out problems with mails. No need to CC me, I'm on 
the list. :)

I also know that thunderbird sucks at this but I'm able to do it. :)

On 09/17/2013 10:21 AM, Tom Hacohen wrote:
> On 17/09/13 08:30, Stefan Schmidt wrote:
>> Hello.
>>
>> On 09/17/2013 07:44 AM, Chris Michael - Enlightenment Git wrote:
>>> devilhorns pushed a commit to branch master.
>>>
>>> commit 64bc97c53c5c3772595f9d2321f9e19590d8a477
>>> Author: Chris Michael <cp.mich...@samsung.com>
>>> Date:   Mon Sep 16 11:40:30 2013 +0100
>>>
>>>       Remove __UNUSED__ from function declaration where parameter is
>>>       actually used.
>>
>> This brings an old topic back into my mind.
>>
>> Its not the first time we eagerly tagged parameters as unused because
>> gcc warned about it and later started to use them without removing the
>> unused label. This has the potential to screw us badly as it is up to
>> the compiler to decide what to do with the parameter here.
>
> I don't know much about the exact implementation details of GCC, but I
> find it very unlikely that GCC is allowed, or will ever actually do
> anything about a *used* variable that is marked as unused. That just
> sounds too crazy to be true. So I don't think we'll ever get screwed.

I have in the back of my mind that we already screwed by this. I don't 
have the details at hand so I can't proof it.

If I ever run into this problem with efl I will bill you the number of 
hours I had to work it out. Could easily be days for such a thing. :)

>>
>> Given how many callback and other signatures we have with user_data or
>> other unused parameters we end up with 3630 EINA_UNUSED and even 71
>> __UNUSED__ in efl alone. All with the potential to be used at some point
>> but forgotten to remove the label.
>
> Again, not really an issue.
>>
>> My proposal would be to use -Wno-unused-parameter in our CFLAGS to
>> disable this warning and remove all EINA_UNUSED and __UNUSED__ from
>> parameters.
>>
>> I know it has the downside that in the rare case where you add a
>> parameter to a signature yourself (read: not using an existing function
>> signature) you might add it and forgot to use it. Which will not
>> reported as warning in this case.
>>
>> In my opinion the risk is higher than the benefit here.
>
> I disagree. I find this warning very useful when prototyping and
> refactoring APIs (both internal and external). I would really hate
> losing that in a mess of warnings.

You just nominated yourself for fixing warnings to not have a mess of 
them. Congrats. :)

>> I expect people to have a different opinion on this and get really angry
>> if I just start to add the CFLAG and remove all EINA_UNSED from
>> parameter so I thought I bring it up here to get some opinions. We
>> normally have plenty of opinions around. :)
>
> I would definitely be angry. Not because I disagree with the whole
> motion, but because it's one of those things that should be discussed
> (so good job discussing).
>
>
> We are already quite good with that. We used to be a bit better a while
> back, unfortunately some people introduced new warnings. However, we are
> still good. I think it's well worth to maintain this.

As written above you won the job taking an eye on this. :)

I will put this into the shelve with things I gave up on for EFL. 
Sitting next to a review-and-pull workflow, good commit messages and a 
sane coding style.

regards
Stefan Schmidt

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