macosx_version should contain the full macOS version

[ryandesign (Ryan Carsten Schmidt)]

I'd like to see the full macOS version (e.g. 10.12.6) in the main.log, but annoyingly, macosx_version only contains the major macOS version (e.g. 10.12). Jeremy briefly changed it to the full version, but there are places in MacPorts base that assume it is only the major version, so that change was quickly reverted.

Can we revisit this idea of changing (some might say correcting) the meaning of macosx_version? Most of the ports that use the variable already accommodate this, since they use vercmp when testing that variable. I fixed the wine ports which were doing the comparison wrong, and I ​sent a PR for libcxx; after that's merged, all the ports should be ok.

Base still has a few places that use string comparison on that variable, but I'm happy to fix those up if we agree to make this change.

Alternately, we could keep macosx_version as is and add a new variable for the full version, as ​Josh suggested, but I don't think that's the best solution.

[kurthindenburg (Kurt Hindenburg)]

​https://github.com/macports/macports-base/pull/180

Comments welcomed

[kurthindenburg (Kurt Hindenburg)]

or ​https://github.com/macports/macports-base/pull/181 which adds a new variable as jmr objects to !180

[kurthindenburg (Kurt Hindenburg)]

Ryan do you want to comment on the pulls? People prefer the new variable.

[jmroot (Joshua Root)]

[1916d6f553cde96dd98c720e3b78a8f9bf29ca85/macports-base]