On Tue, Oct 1, 2019 at 11:16 PM Björn Töpel <bjorn.topel@xxxxxxxxx> wrote:
>
> On Tue, 1 Oct 2019 at 14:33, Masahiro Yamada
> <yamada.masahiro@xxxxxxxxxxxxx> wrote:
> >
> > Hi Bjorn
> >
> > On Tue, Oct 1, 2019 at 7:14 PM Björn Töpel <bjorn.topel@xxxxxxxxx> wrote:
> > >
> [...]
> > > subdir-$(CONFIG_SAMPLE_VFS) += vfs
> > > +subdir-$(CONFIG_SAMPLE_BPF) += bpf
> >
> >
> > Please keep samples/Makefile sorted alphabetically.
> >
>
> Thank you, I'll address that in the v2!
>
> >
> >
> >
> > I am not checking samples/bpf/Makefile, but
> > allmodconfig no longer compiles for me.
> >
> >
> >
> > samples/bpf/Makefile:209: WARNING: Detected possible issues with include path.
> > samples/bpf/Makefile:210: WARNING: Please install kernel headers
> > locally (make headers_install).
> > error: unable to create target: 'No available targets are compatible
> > with triple "bpf"'
> > 1 error generated.
> > readelf: Error: './llvm_btf_verify.o': No such file
> > *** ERROR: LLVM (llc) does not support 'bpf' target
> > NOTICE: LLVM version >= 3.7.1 required
> >
So, samples/bpf intentionally opts out the normal build
because most of people fail to build it.
It must be fixed somehow
before supporting it in samples/Makefile.
> Yes, the BPF samples require clang/LLVM with BPF support to build. Any
> suggestion on a good way to address this (missing tools), better than
> the warning above? After the commit 394053f4a4b3 ("kbuild: make single
> targets work more correctly"), it's no longer possible to build
> samples/bpf without support in the samples/Makefile.
You can with
"make M=samples/bpf"
--
Best Regards
Masahiro Yamada
