>Either way, LLVM's license is still Free Software, still Open Source. And LLVM's permissive license is actually proof that you don't necessarily need a copylef

>Either way, LLVM's license is still Free Software, still Open Source. And LLVM's permissive license is actually proof that you don't necessarily need a copyleft license to get companies to contribute. And we've got a whole ecosystem of such projects built with permissive licenses, hello BSD/OS. It's also enables proprietary extensions, easily enabling companies to make compilers for their proprietary languages, see CUDA. That seems pretty contrary to the mission of free software. Also, just curious, how many patches have FreeBSD and co. actually received back from Sony and Apple in the past few years? They still seem to be struggling to add features to the point of begging for 802.11ac support.