Maverics/Xcode 5 proposal: no more xcode-select --install

[Ned Deily]

In article <52711F90.70809 at macports.org>,
 Rainer Muller <raimue at macports.org> wrote:
> Well, after thinking about this again, we could also do it the other way
> around. The majority of ports already builds just fine if you have the
> Command Line Tools only, without Xcode (ignore warnings from base about
> missing xcodebuild, it's not actually required in this case).
> 
> That would allow to save the additional installation of Xcode.app and
> only require `xcode-select --install`. However, with only ~2.5 GiB, the
> reduced disk usage without Xcode.app is quite small compared to the
> increasing drive capacities.
> 
> For this variant we would first need to track which parts of Xcode and
> which SDKs are actually required for each port. This information could
> however also be relevant for sandboxing/trace mode. Maybe we could add
> some new depspec to base to mark ports that require the full Xcode
> installation, something like:   depends_build tool:xcode