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.
