Pretty well. Sony's porting of AVX, for example is pretty nice, there's a good performance boost in hand there. ARM's also made some substantial improvements to

Pretty well. Sony's porting of AVX, for example is pretty nice, there's a good performance boost in hand there. ARM's also made some substantial improvements to LLVM, in fact dumping their old proprietary compiler for one built around LLVM. Neither of these things would have likely happened if the two projects in question had been GPL-encumbered.