[Development] Qt LTS & C++11 plans

[Sorvig Morten]

> On 18 Aug 2015, at 07:46, Thiago Macieira <thiago.macieira at intel.com> wrote:
> 
> On Monday 13 July 2015 18:44:40 Thiago Macieira wrote:
>> On Wednesday 08 July 2015 13:42:12 Thiago Macieira wrote:
>>> The only compiler I currently know that will have problems with this is
>>> the  Intel compiler on OS X when using libc++ older than Subversion
>>> r215305. Unfortunately, _LIBCPP_VERSION has been at value 1101 since way
>>> before that change. To restore functionality, I will revert
>>> 1b961e8b5d508d054e31c0050f27891606714393 after 5.6 branches off from dev.
>> 
>> Upon further investigation, it turns out that ICC has worked around the
>> libc++  problem since version 15.0 by providing its own std::atomic
>> implementation when __clang__ is defined (probably a mistake and should
>> have been a check for _LIBCPP_VERSION).
> 
> Looks like std::atomic that came with the latest XCode that still runs on OS X 
> 10.8 is also broken with Clang.
> 
> Choices:
> 1) drop the ability to build Qt and applications using an old XCode
> 2) keep qatomic_x86.h for OS X.
> 
> So, Mac people: is it ok to drop OS X 10.8 as a *build* platform? This should 
> not affect using it as a target.

CI testing may be sufficient reason to keep Qt building on 10.8, unless we have/gain the the capability to have separate “build” and “test” machines.

Morten