On Wed, 19 Feb 2020 14:28:56 +0100 Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > On Wed, Feb 19, 2020 at 01:30:12PM +0100, Jesper Dangaard Brouer wrote: > > Hi Andrii, > > > > Downloaded tarball for kernel release 5.5.4, and I cannot compile > > tools/testing/selftests/bpf/ with latest LLVM release version 9. > > Is this something that recently broke? If so, what commit caused it? Digging through, it seems several commits. > And has llvm 9 always worked here? Yes, llvm-9 used to work for tools/testing/selftests/bpf/. > > Looking closer at the build error messages, I can see that this is > > caused by using LLVM features that (I assume) will be avail in release > > 10. I find it very strange that we can release a kernel that have build > > dependencies on a unreleased version of LLVM. > > Is this the first time you have tried using llvm to build a kernel? > This isn't a new thing :) LOL - we are talking past each-other... I'm not building the entire kernel with LLVM. Notice I'm talking about the BPF-selftests located in directory tools/testing/selftests/bpf/. Building the selftests programs are broken We always use LLVM to build BPF programs (both samples/bpf/ and selftests). > > I love the new LLVM BTF features, but we cannot break users/CI-systems > > that wants to run the BPF-selftests. -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
