Not sure what you mean, exactly. GCC went away for 5.x, sure, but that's because they've switched over to clang, which may not be (L)GPL, but is open source, an

Not sure what you mean, exactly. GCC went away for 5.x, sure, but that's because they've switched over to clang, which may not be (L)GPL, but is open source, and I haven't heard any stories of secret modifications to it. Everything else seems to have remained from one iOS release to the next...?