> 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). I think that makes sense. >> >> >> >> >> 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
