@p @niconiconi I think it's pretty much momentum due to the absolute lack of tools but I haven't benchmarked between GCC and LLVM (heck I barely have any non-amd64 machine, basically because ARM sucks as a platform on many layers).

At least for ARM I'd expect things to be decent if not better given that Apple is AFAIK stuck to LLVM/Clang due to gcc's relicensing to GPL-3+ and Google also favors it.