Building clang/cling 3.5 for ROOT on Lion

[Ryan Schmidt]

On Apr 8, 2014, at 03:06, Chris Jones <jonesc at hep.phy.cam.ac.uk> wrote:

> On 08/04/14 01:48, Ryan Schmidt wrote:
>> 
>> On Apr 7, 2014, at 18:09, Christopher Jones wrote:
>> 
>>> p.s. whats the most recent MacPorts clang compiler you can install on OSX10.7 ?
>> 
>> clang 3.4 and earlier should build fine on 10.7.
> 
> Indeed. They aren't quite the same thing though in the end, as on OSX 10.8 and newer it supports c++11, whereas on 10.7 it doesn't, because of the underlying system support. So the same clang34 compiler now builds root6 fine on OSX10.9, but fails on 10.7.
> 
> My recollection of all the previous times c++11 has been discussed, can be summarised as there is no obvious way to support it cleanly on older OSX releases. So if an upstream package, as ROOT6 has, is actively only targetting c++11 supporting compilers, then effectively these ports cannot be used on older OSX releases now. Is that correct, or am I being overly pessimistic here ?

Using latest gcc (currently gcc48) might be a way to support C++11 on OS X < 10.9, but otherwise, with clang, C++11 requires 10.9+.