Do you still need to compile all of LLVM? I tried to install Rust a few days ago and came back to my computer using gigabytes of swap space, which I assume is due to LLVM.
Yeah, for the moment it still uses a custom LLVM, so the first compile is still a pain (though LLVM does build in parallel really well with -j8). I really hope that the Rust devs make it a priority to upstream their LLVM customizations, especially if they hope to be pegged to a stable LLVM release by Rust 1.0.