On Fri, Apr 28, 2023 at 2:04 AM Jose E. Marchesi <jose.marchesi@xxxxxxxxxx> wrote: > > > > On Thu, Apr 27, 2023 at 4:36 PM Daniel Rosenberg <drosen@xxxxxxxxxx> wrote: > >> > >> On Wed, Apr 26, 2023 at 4:39 PM Andrii Nakryiko > >> <andrii.nakryiko@xxxxxxxxx> wrote: > >> > > >> > Don't know, show the sequence of commands you are running? > >> > > >> > I have linux source in ~/linux, and KBUILD_OUTPUT set to > >> > ~/linux-build/default. And it only takes this: > >> > > >> > $ cd ~/linux > >> > $ make -j90 # build kernel > >> > $ cd tools/testing/selftests/bpf > >> > $ make -j90 # build selftests > >> > > >> > And that's it. > >> > >> I've tried the same, modulo some paths. I'm pretty sure it's version > >> related at this point. > >> The current issue I'm seeing is "error: indirect call in function, > >> which are not supported by eBPF" when using GCC-BPF for > >> progs/bind4_prog.c > > > > I don't think GCC-BPF is able to compile selftests properly just yet. > > So I guess the problem is that you do have some version of gcc-bpf in > > the system and selftest's Makefile tries to build gcc variants of > > test_progs? That's bad (I don't have GCC-BPF locally, and everyone > > else apparently as well). > > > > So for now just `make BPF_GCC=` ? CC'ing Jose, we should probably > > agree on some criteria of "GCC-BPF is really capable of building > > selftests" and adjust Makefile to only attempt GCC BPF build in that > > case. > > Being able to run the selftests is our goal at the moment, but we are > not there yet, no. > > What about making the kernel build system to emit a visible warning > before it builds the GCC variants of the tests programs? Something like > "this is experimental and will likely fail". Given gcc-bpf can't build selftests right now, should we just disable it until there is a version on which gcc-bpf works? We can make it such that you can force it to build using gcc-bpf (make USE_GCC_BPF=1 or something). > > >> > >> Currently using clang 16.0.0 and gcc 12.2.0-14. > >> I did manage to get it to build by just commenting out TEST_GEN_PROGS > >> += test_progs-bpf_gcc
