Using xz by default for compression

[Ryan Schmidt]

On Jan 26, 2015, at 3:01 AM, Rainer Müller wrote:

> On 2015-01-26 00:56, Eric A. Borisch wrote:
>> FYI, lbzip2 is what you probably want, as it *can* decompress a 'stock'
>> archive faster. From the man page:
>> 
>> "The lbzip2 utility employs multiple threads and an input-bound splitter
>> even when decompressing .bz2 files created by standard bzip2."
> 
> lbzip2 is already supported and preferred over pbzip2 in trunk.

I missed or forgot that, but we might not prefer that, because it is GPL-3 licensed. It would be helpful if our base software and the dependencies it uses were licensed in such a way that Apple employees could examine and if necessary improve it; GPL-3 precludes that and locks us out of potentially valuable contributors.