Re: [PATCH bpf-next v2 0/5] bpf: tools: support build selftests/bpf with clang

[Jiri Olsa <jolsa@redhat.com>]

On Thu, Apr 15, 2021 at 07:17:35PM +0200, Jiri Olsa wrote:
> On Thu, Apr 15, 2021 at 09:55:50AM -0700, Nick Desaulniers wrote:
> > On Thu, Apr 15, 2021 at 6:23 AM Jiri Olsa <jolsa@redhat.com> wrote:
> > >
> > > On Wed, Apr 14, 2021 at 05:16:01PM -0700, Andrii Nakryiko wrote:
> > > > On Wed, Apr 14, 2021 at 6:18 AM Jiri Olsa <jolsa@redhat.com> wrote:
> > > > >
> > > > > On Tue, Apr 13, 2021 at 01:45:39PM -0700, Nick Desaulniers wrote:
> > > > >
> > > > > SNIP
> > > > >
> > > > > > > > >
> > > > > > > > > So I'm not sure precisely what's going on here.  I probably have to go
> > > > > > > > > digging around to understand tools/build/feature/ anyways.  With your
> > > > > > > > > v3 applied, I consistently see:
> > > > > > > > > No zlib found
> > > > > > > > > and yet, I certainly do have zlib on my host.
> > > > > > > > > https://stackoverflow.com/a/54558861
> > > > > > > >
> > > > > > > > Jiri, any tips on how to debug feature detection in
> > > > > > > > tools/build/feature/Makefile?
> > > > > > >
> > > > > > > for quick check, there's output file for each test, like:
> > > > > > >
> > > > > > >         [jolsa@krava feature]$ ls -l *.make.output
> > > > > > >         -rw-rw-r--. 1 jolsa jolsa   0 Apr  8 20:25 test-all.make.output
> > > > > > >         -rw-rw-r--. 1 jolsa jolsa 182 Apr  9 15:52 test-bionic.make.output
> > > > > > >         -rw-rw-r--. 1 jolsa jolsa   0 Apr  8 20:25 test-cplus-demangle.make.output
> > > > > > >         -rw-rw-r--. 1 jolsa jolsa 145 Apr  9 15:52 test-jvmti.make.output
> > > > > > >         -rw-rw-r--. 1 jolsa jolsa   0 Apr  8 20:25 test-libbabeltrace.make.output
> > > > > > >         -rw-rw-r--. 1 jolsa jolsa   0 Apr  8 20:25 test-libbpf.make.output
> > > > > > >         -rw-rw-r--. 1 jolsa jolsa   0 Apr  8 20:25 test-libdebuginfod.make.output
> > > > > > >         -rw-rw-r--. 1 jolsa jolsa 193 Apr  9 15:52 test-libunwind-aarch64.make.output
> > > > > > >         -rw-rw-r--. 1 jolsa jolsa 177 Apr  9 15:52 test-libunwind-x86.make.output
> > > > > > >         [jolsa@krava feature]$ cat test-libunwind-aarch64.make.output
> > > > > > >         test-libunwind-aarch64.c:2:10: fatal error: libunwind-aarch64.h: No such file or directory
> > > > > > >             2 | #include <libunwind-aarch64.h>
> > > > > > >               |          ^~~~~~~~~~~~~~~~~~~~~
> > > > > > >         compilation terminated.
> > > > > > >         [jolsa@krava feature]$ cat test-libunwind-x86.make.output
> > > > > > >         test-libunwind-x86.c:2:10: fatal error: libunwind-x86.h: No such file or directory
> > > > > > >             2 | #include <libunwind-x86.h>
> > > > > > >               |          ^~~~~~~~~~~~~~~~~
> > > > > > >
> > > > > > > zlib should be done by:
> > > > > > >         [jolsa@krava feature]$ make test-zlib.bin
> > > > > > >         gcc  -MD -Wall -Werror -o test-zlib.bin test-zlib.c  > test-zlib.make.output 2>&1 -lz
> > > > > > >
> > > > > > >
> > > > > > > I can try to recreate, how do you build?
> > > > > >
> > > > > > See note above, I'm similarly running precisely:
> > > > > > $ make LLVM=1 LLVM_IAS=1 -j72 defconfig
> > > > > > $ make LLVM=1 LLVM_IAS=1 -j72 clean
> > > > > > $ make LLVM=1 LLVM_IAS=1 -j72 -C tools/testing/selftests/bpf
> > > > >
> > > > > for some reason I'm stuck with this error on latest bpf-next/master
> > > >
> > > > did you build vmlinux image before building selftests? those enums
> > > > should come through vmlinux.h from up-to-date vmlinux
> > >
> > > it was there.. but I found the clang/lld I compiled can't link properly,
> > > which is probably unrelated to the error below, but I need to solve it
> > > first ;-)
> > 
> > Do you have more info about what command you're running, or what error
> > you're observing?  The kernel itself is not linking for you?
> 
> I did the commands you sent, but I might have but llvm/clang build,
> I'm rebuilding now, it takes forever.. 

ok, finished all commands finaly.. did not reproduce the issue :-\
any luck with those build make.output files for zlib?

jirka