But the FSF would not be curious to test this in court because they know they lose. I had this conversation many years ago with people that wrote extactly this type of software and the general consensus was that the FSF would stay away from probing the GPL there because there is angood chance that the ruling would set a precedent they don't want. The FUD surrounding the license in that regard is preferrable.

In general it's 2016 and no longer relevant. The world moved on to LLVM and these GCC using toolchains are on their way out for good.