LibCxxOnOlderSystems - and more software that is pushing for gcc

[Chris Jones]

> On 25 Sep 2016, at 2:25 pm, Brandon Allbery <allbery.b at gmail.com> wrote:
> 
> 
>> On Sun, Sep 25, 2016 at 8:29 AM, Ken Cunningham <ken.cunningham.webuse at gmail.com> wrote:
>> What is happening exactly on my MacPros running 10.11, I wonder? Software installed by macports on 10.11 is using clang++ (mostly) and g++ (sometimes). clang++ is linking against libc++, and g++ is presumably  linking against libstdc++ as that is what it does -- yet there appear to be no visible issues...and these libraries find each other. 
> 
> An additional complication is that it's not using the same libstdc++: it's using the GPL3 one with C++11 support, not Apple's GPL2/pre-C++11 one. So potentially the clash here is between the two libstdc++ versions, not libstdc++ and libc++.

Indeed, mixing two different libstdc++ runtimes has the same sort of issues as mixing libstd++ with libc++.

> 
> -- 
> brandon s allbery kf8nh                               sine nomine associates
> allbery.b at gmail.com                                  ballbery at sinenomine.net
> unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
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