On Wed, Feb 19, 2020 at 9:04 AM Jesper Dangaard Brouer <brouer@xxxxxxxxxx> wrote: > > On Wed, 19 Feb 2020 08:41:27 -0800 > Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> wrote: > > > On Wed, Feb 19, 2020 at 4:30 AM Jesper Dangaard Brouer > > <brouer@xxxxxxxxxx> wrote: > > > > > > I'm willing to help out, such that we can do either version or feature > > > detection, to either skip compiling specific test programs or at least > > > give users a proper warning of they are using a too "old" LLVM version. > > ... > > > progs/test_core_reloc_bitfields_probed.c:47:13: error: use of unknown builtin '__builtin_preserve_field_info' [-Wimplicit-function-declaration] > > > out->ub1 = BPF_CORE_READ_BITFIELD_PROBED(in, ub1); > > > > imo this is proper warning message already. > > This is an error, not a warning. The build breaks as the make process stops. > Latest Clang was a requirement for building and running all selftests for a long time now. There were few previous discussions on mailing list about this and each time the conclusion was the same: latest Clang is a requirement for BPF selftests. > -- > Best regards, > Jesper Dangaard Brouer > MSc.CS, Principal Kernel Engineer at Red Hat > LinkedIn: http://www.linkedin.com/in/brouer >
