RFC: Move to C++14

[Cemil Azizoglu]

Correct.

On Thu, Feb 19, 2015 at 9:03 AM, Kevin Gunn <kevin.gunn at canonical.com>
wrote:

> right, aren't android base & gmocks are also out of sync ?
> br,kg
>
> On Thu, Feb 19, 2015 at 8:59 AM, Cemil Azizoglu <
> cemil.azizoglu at canonical.com> wrote:
>
>> Trusty is not dropped. At least, not because we have moved to C++14. If
>> supporting Trusty were as simple as having compiler support, we already
>> have that with the PPA for 4.9 Chris pointed out. Though, other reasons
>> making that support difficult remain. But those are not related to the
>> choice of compiler.
>>
>> Thanks,
>> Cemil
>>
>>
>> On Wed, Feb 18, 2015 at 8:12 PM, Daniel van Vugt <
>> daniel.van.vugt at canonical.com> wrote:
>>
>>> We do seem to be guilty of having the same conversations in multiple
>>> different places a lot :)
>>>
>>> Just FYI, the nail is in the coffin. C++14 support landed last night. So
>>> trusty is dropped I guess.
>>>
>>>
>>>
>>> On 18/02/15 12:43, Daniel van Vugt wrote:
>>>
>>>> As a compromise why don't we say Mir supports the latest LTS only?
>>>>
>>>> So 14 months from now, we'll be free to jump to C++14 (and it will be
>>>> more mature in implementation by then). But until then, we would stick
>>>> to C++11 for trusty.
>>>>
>>>>
>>>>
>>>> On 18/02/15 09:39, Daniel van Vugt wrote:
>>>>
>>>>> I think this is a bad idea.
>>>>>
>>>>> Supporting trusty with the latest Mir is presently easy, as
>>>>> demonstrated:
>>>>> https://code.launchpad.net/~vanvugt/mir/revive-trusty/+merge/249789
>>>>>
>>>>> Using newer language specs I think is contrary to engineering maturity.
>>>>> Because it means we knowingly and needlessly reduce the number of
>>>>> distros Mir can support. And we also make the learning curve for people
>>>>> even steeper (fewer C++ developers know the new language features).
>>>>>
>>>>> Overall this will lead to reduced adoption by users and reduced
>>>>> participation by developers. We need to be careful and draw the line
>>>>> somewhere... stop upgrading to the latest C++ every time one comes
>>>>> along.
>>>>>
>>>>> - Daniel
>>>>>
>>>>>
>>>>> On 17/02/15 20:37, Alexandros Frantzis wrote:
>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> I think it's to time to consider moving from C++11 to C++14 (at least
>>>>>> the C++14 features our compilers support). C++14 offers some useful
>>>>>> improvements over C++11, like:
>>>>>>
>>>>>> * std::make_unique()
>>>>>> * standard literal suffixes for std::chrono (e.g. auto delay = 10ms;)
>>>>>> * std::shared_timed_mutex (aka RW mutex)
>>>>>> * generic lambdas
>>>>>> * lambda capture initializers (which, importantly, allow moving values
>>>>>> into
>>>>>>    lambdas)
>>>>>>
>>>>>> Moving to C++14 means that we will not be able to build Mir on a
>>>>>> pristine Ubuntu LTS 14.04 system. Note that, even now, Mir cannot be
>>>>>> fully built on the LTS because of changes in the Android interfaces.
>>>>>> As
>>>>>> things currently stand, I believe that dropping support for 14.04
>>>>>> builds
>>>>>> in order to allow C++14 is a worthy trade-off.
>>>>>>
>>>>>> In addition, not supporting 14.04 builds means that we will be able to
>>>>>> use all the new features of other libraries we depend on, e.g.
>>>>>> gmock/gtest.
>>>>>>
>>>>>> It's also worth noting that our packages depend on g++-4.9 (which
>>>>>> supports the C++14 features we want).
>>>>>>
>>>>>> I have published an MP introducing C++14 into our codebase:
>>>>>>
>>>>>> https://code.launchpad.net/~afrantzis/mir/introduce-c++14/
>>>>>> +merge/249988
>>>>>>
>>>>>> Let me know what you think.
>>>>>>
>>>>>> Thanks,
>>>>>> Alexandros
>>>>>>
>>>>>>
>>>>>
>>>>
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>>
>>
>>
>> --
>> Cemil Azizoglu
>> Mir Display Server - Team Lead
>> Canonical USA
>>
>> --
>> Mir-devel mailing list
>> Mir-devel at lists.ubuntu.com
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>>
>


-- 
Cemil Azizoglu
Mir Display Server - Team Lead
Canonical USA
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