I was under the impression that [patents were no longer believed to be an issue](http://llvm.org/docs/DeveloperPolicy.html#patents "LLVM Patent Policy") any more than they'd be for GCC (which is arguably more vulnerable to patent issues).
GCC represents a lot of technology for parsing/compiler/optimizing/handling platform differences/generating executable formats, and it does so in a fairly traditional fashion. Generally with software patents, what really exposes you is doing things more like everyone else does. Counter intuitive, but true.
> GCC (which is arguably more vulnerable to patent issues)
And that statement certainly implies that A is _more_ vulnerable than B which promted me to ask what would make it _more_ vulnerable as I can't see in what way that would be true.