I've just had a bit of fun updating the SPIR-V backend to use https://github.com/KhronosGroup/SPIRV-LLVM-Translator instead of the old one which wasn't being updated. I'm in the process of adding clspv as a backend for Vulkan Compute shaders (in turn as a basis for targeting Intel's ispc compiler optimisations). Most of that fun involves bashing CMake around that head to try to get it to talk properly with pkg-config (I hate them both).