Why Clang

[Sean Cavanaugh]

> 
> i wouldn't be surprised that FreeBSD team would decide to go back to gcc
> soon.
> 
I would as one of the driving forces of the change was to replace GPL
licensed code in FreeBSD core with more permissive licensed code. This helps
to remove a massive legal encumberment for a lot of developers who no longer
have to worry how their BSD licensed code has to be treated if its compiled
thru a GPL compiler.