Building clang/cling 3.5 for ROOT on Lion

[Ryan Schmidt]

On Apr 8, 2014, at 07:46, Chris Jones wrote:

> On 08/04/14 13:41, Joshua Root wrote:
>> On 2014-4-8 22:35 , Ryan Schmidt wrote:
>>> 
>>> On Apr 8, 2014, at 07:34, Chris Jones wrote:
>>> 
>>>>>> PS: It's not an issue of me personally upgrading the OS. I'll do that
>>>>>> sooner or later. But it would be slightly suboptimal if the port only
>>>>>> worked on 10.9.
>>>> 
>>>> As a general point, I agree, only OSX10.9 has full c++11 support. However, upstream claim to be targeting 10.8 and 10.9, so I would hope it would work on OSX10.8 as well (to be tested sometime, by someone who has access to a 10.8 machine). Whilst not ideal, I think this is reasonable coverage (given root5 will remain available for all versions).
>>> 
>>> Well, libc++ (with full C++11 support) is included in 10.8, it’s just not the default. As long as root doesn’t use any other libraries, it should build fine with that, if you instruct it to. But then any other software that wants to use root would have to do that as well.
>> 
>> Indeed, if you can get around the issues with using a non-default
>> runtime on 10.8, then that should transfer pretty easily to 10.7 and
>> 10.6 as well.
> 
> Thats OK for a standalone build, but the whole point of having root in macports is to pick up various dependencies from Macports. This trick would then only work if the user built all of these dependencies against libc++ as well.

This would only apply to those dependencies of root that use C++.


> SO unless MacPorts is planning on switch its 10.8 builds to by default use libc++, this doesn't help much with getting the port working on 10.8

At this time, we believe it is best to leave 10.8 and earlier on libstdc++, and use libc++ on 10.9 and later. There is a FAQ entry…