Earlier quoted context omitted.
> Stallman wants you to use Free software because it's free-as-in-ideology, not because it necessarily works well or does what you want. Though, the point is, you can make free software work the way you want or work better. You're _allowed_ to. That isn't necessarily the case with other software; that is the point of free software.
You are correct in that the license is free, but it isn't a copyleft license. This is a purely political decision: RMS wants gcc not only to be free software but he also wants it to be unusable to create non-free derivatives thus making it an active tool in furthering free software. clang undermines this because you can create non-free software based on it thus making it a tool that can easily be used to restrict fre…
> They have been supported by Apple, the company which hates our freedom so much that its app store for the ithings _requires_ all apps to be nonfree.
> The only code that helps us and not our adversaries is copylefted code. Free software released under a pushover license is available for us to use, but available to our adversaries just as well.
> If that enables GCC to "win", the victory would be hollow, because it would not be a victory for what really matters: users' freedom.
> The existence of LLVM is a terrible setback for our community precisely because it is not copylefted and can be used as the basis for nonfree compilers