On my 280X video cards I keep getting these warnings with V4:
WARNING: Linking two modules of different data layouts!
WARNING: Linking two modules of different target triples: input.bc: 'amdil64-pc-unknown-amdopencl' and 'amdil-pc-unknown-amdopencl'
WARNING: Linking two modules of different data layouts!
WARNING: Linking two modules of different target triples: input.bc: 'amdil64-pc-unknown-amdopencl' and 'amdil-pc-unknown-amdopencl'
WARNING: Linking two modules of different data layouts!
WARNING: Linking two modules of different target triples: input.bc: 'amdil64-pc-unknown-amdopencl' and 'amdil-pc-unknown-amdopencl'
WARNING: Linking two modules of different data layouts!
WARNING: Linking two modules of different target triples: input.bc: 'amdil64-pc-unknown-amdopencl' and 'amdil-pc-unknown-amdopencl'
Apart from that, it seems to be working.
I will need to figure out the best settings next.