Changing default cxx_stdlib to libc++

[Ryan Schmidt]

On Mar 8, 2018, at 11:24, Joshua Root wrote:

> Code to check C++ stdlib linkage in rev-upgrade is now in master. That
> takes care of the main obstacle to being able to change the default stdlib.

Currently, we publish archives on packages.macports.org for 10.8 and earlier that are built for libstdc++. Currently, if we were to create archives for libc++ on those systems, the archive names would be the same. Is your plan to leave it that way, or to change the archive names for libc++ to distinguish them from the old libstdc++ archives?