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. -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
