Clang/LLVM does not restrict users from developing their own extensions and licensing them as they see fit which ironically makes the software not free (accordi

Clang/LLVM does not restrict users from developing their own extensions and licensing them as they see fit which ironically makes the software not free (according to the RMS ideological software freedom purity test). This restricts users freedom, that is his point. GPL is not about the rights of the programmer, it is about the rights of the end user.