Stallman on GCC, LLVM, and copyleft

Then I am afraid the API is of little usage for anybody but GCC developers. I am not convinced it is hopeless though, there is probably a lot of functionality in GCC that can be of interest for external usage in a plugin setting, which does not force you into a global dependency spaghetti. Parsing comes to mind as something people have asked for. While IPO kind of takes in everything, I believe functionality like vectorization is more modular and local in nature. It is probably possible to split out rather high level stuff too, sacrificing the flexibility of the API for usability. For instance a high level JIT library (not sure how well it would work out for the Octave folks, but who knows) can be a good target since it is being designed as we speak.