From: Jesper Dangaard Brouer <brouer@redhat.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: brouer@redhat.com, "Andrii Nakryiko" <andriin@fb.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
BPF-dev-list <bpf@vger.kernel.org>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"Daniel Borkmann" <borkmann@iogearbox.net>,
"David Miller" <davem@davemloft.net>,
LKML <linux-kernel@vger.kernel.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Anders Roxell" <anders.roxell@linaro.org>,
"Toke Høiland-Jørgensen" <toke@redhat.com>
Subject: Kernel 5.5.4 build fail for BPF-selftests with latest LLVM
Date: Wed, 19 Feb 2020 13:30:12 +0100 [thread overview]
Message-ID: <20200219133012.7cb6ac9e@carbon> (raw)
Hi Andrii,
Downloaded tarball for kernel release 5.5.4, and I cannot compile
tools/testing/selftests/bpf/ with latest LLVM release version 9.
Looking closer at the build error messages, I can see that this is
caused by using LLVM features that (I assume) will be avail in release
10. I find it very strange that we can release a kernel that have build
dependencies on a unreleased version of LLVM.
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.
I love the new LLVM BTF features, but we cannot break users/CI-systems
that wants to run the BPF-selftests.
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
http://releases.llvm.org/download.html
Compile error message:
unknown builtin '__builtin_preserve_field_info'
Full:
make -C /home/jbrouer/build/linux-5.5.4/tools/lib/bpf OUTPUT=/home/jbrouer/build/linux-5.5.4/tools/testing/selftests/bpf/
make[1]: Entering directory '/home/jbrouer/build/linux-5.5.4/tools/lib/bpf'
make[1]: Leaving directory '/home/jbrouer/build/linux-5.5.4/tools/lib/bpf'
(clang -I. -I/home/jbrouer/build/linux-5.5.4/tools/testing/selftests/bpf -g -D__TARGET_ARCH_x86 -mlittle-endian -I. -I./include/uapi -I/home/jbrouer/build/linux-5.5.4/tools/include/uapi -I/home/jbrouer/build/linux-5.5.4/tools/lib/bpf -I/home/jbrouer/build/linux-5.5.4/tools/testing/selftests/usr/include -idirafter /usr/local/include -idirafter /usr/lib64/clang/9.0.0/include -idirafter /usr/include -Wno-compare-distinct-pointer-types -O2 -target bpf -emit-llvm -c progs/test_core_reloc_bitfields_probed.c -o - || echo "BPF obj compilation failed") | llc -mattr=dwarfris -march=bpf -mcpu=probe -mattr=+alu32 -filetype=obj -o /home/jbrouer/build/linux-5.5.4/tools/testing/selftests/bpf/test_core_reloc_bitfields_probed.o
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);
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:52:2: note: expanded from macro 'BPF_CORE_READ_BITFIELD_PROBED'
__CORE_BITFIELD_PROBE_READ(&val, s, field); \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:28:10: note: expanded from macro '__CORE_BITFIELD_PROBE_READ'
__CORE_RELO(src, fld, BYTE_SIZE), \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:23:2: note: expanded from macro '__CORE_RELO'
__builtin_preserve_field_info((src)->field, BPF_FIELD_##info)
^
progs/test_core_reloc_bitfields_probed.c:48:13: error: use of unknown builtin '__builtin_preserve_field_info' [-Wimplicit-function-declaration]
out->ub2 = BPF_CORE_READ_BITFIELD_PROBED(in, ub2);
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:52:2: note: expanded from macro 'BPF_CORE_READ_BITFIELD_PROBED'
__CORE_BITFIELD_PROBE_READ(&val, s, field); \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:28:10: note: expanded from macro '__CORE_BITFIELD_PROBE_READ'
__CORE_RELO(src, fld, BYTE_SIZE), \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:23:2: note: expanded from macro '__CORE_RELO'
__builtin_preserve_field_info((src)->field, BPF_FIELD_##info)
^
progs/test_core_reloc_bitfields_probed.c:49:13: error: use of unknown builtin '__builtin_preserve_field_info' [-Wimplicit-function-declaration]
out->ub7 = BPF_CORE_READ_BITFIELD_PROBED(in, ub7);
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:52:2: note: expanded from macro 'BPF_CORE_READ_BITFIELD_PROBED'
__CORE_BITFIELD_PROBE_READ(&val, s, field); \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:28:10: note: expanded from macro '__CORE_BITFIELD_PROBE_READ'
__CORE_RELO(src, fld, BYTE_SIZE), \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:23:2: note: expanded from macro '__CORE_RELO'
__builtin_preserve_field_info((src)->field, BPF_FIELD_##info)
^
progs/test_core_reloc_bitfields_probed.c:50:13: error: use of unknown builtin '__builtin_preserve_field_info' [-Wimplicit-function-declaration]
out->sb4 = BPF_CORE_READ_BITFIELD_PROBED(in, sb4);
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:52:2: note: expanded from macro 'BPF_CORE_READ_BITFIELD_PROBED'
__CORE_BITFIELD_PROBE_READ(&val, s, field); \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:28:10: note: expanded from macro '__CORE_BITFIELD_PROBE_READ'
__CORE_RELO(src, fld, BYTE_SIZE), \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:23:2: note: expanded from macro '__CORE_RELO'
__builtin_preserve_field_info((src)->field, BPF_FIELD_##info)
^
progs/test_core_reloc_bitfields_probed.c:51:14: error: use of unknown builtin '__builtin_preserve_field_info' [-Wimplicit-function-declaration]
out->sb20 = BPF_CORE_READ_BITFIELD_PROBED(in, sb20);
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:52:2: note: expanded from macro 'BPF_CORE_READ_BITFIELD_PROBED'
__CORE_BITFIELD_PROBE_READ(&val, s, field); \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:28:10: note: expanded from macro '__CORE_BITFIELD_PROBE_READ'
__CORE_RELO(src, fld, BYTE_SIZE), \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:23:2: note: expanded from macro '__CORE_RELO'
__builtin_preserve_field_info((src)->field, BPF_FIELD_##info)
^
progs/test_core_reloc_bitfields_probed.c:52:13: error: use of unknown builtin '__builtin_preserve_field_info' [-Wimplicit-function-declaration]
out->u32 = BPF_CORE_READ_BITFIELD_PROBED(in, u32);
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:52:2: note: expanded from macro 'BPF_CORE_READ_BITFIELD_PROBED'
__CORE_BITFIELD_PROBE_READ(&val, s, field); \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:28:10: note: expanded from macro '__CORE_BITFIELD_PROBE_READ'
__CORE_RELO(src, fld, BYTE_SIZE), \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:23:2: note: expanded from macro '__CORE_RELO'
__builtin_preserve_field_info((src)->field, BPF_FIELD_##info)
^
progs/test_core_reloc_bitfields_probed.c:53:13: error: use of unknown builtin '__builtin_preserve_field_info' [-Wimplicit-function-declaration]
out->s32 = BPF_CORE_READ_BITFIELD_PROBED(in, s32);
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:52:2: note: expanded from macro 'BPF_CORE_READ_BITFIELD_PROBED'
__CORE_BITFIELD_PROBE_READ(&val, s, field); \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:28:10: note: expanded from macro '__CORE_BITFIELD_PROBE_READ'
__CORE_RELO(src, fld, BYTE_SIZE), \
^
/home/jbrouer/build/linux-5.5.4/tools/lib/bpf/bpf_core_read.h:23:2: note: expanded from macro '__CORE_RELO'
__builtin_preserve_field_info((src)->field, BPF_FIELD_##info)
^
7 errors generated.
llc: error: llc: <stdin>:1:1: error: expected top-level entity
BPF obj compilation failed
^
make: *** [Makefile:281: /home/jbrouer/build/linux-5.5.4/tools/testing/selftests/bpf/test_core_reloc_bitfields_probed.o] Error 1
next reply other threads:[~2020-02-19 12:30 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-19 12:30 Jesper Dangaard Brouer [this message]
2020-02-19 13:28 ` Kernel 5.5.4 build fail for BPF-selftests with latest LLVM Greg Kroah-Hartman
2020-02-19 13:42 ` Jesper Dangaard Brouer
2020-02-19 18:12 ` Greg Kroah-Hartman
2020-02-19 19:40 ` Jesper Dangaard Brouer
2020-02-19 20:20 ` Greg Kroah-Hartman
2020-02-19 16:41 ` Alexei Starovoitov
2020-02-19 17:03 ` Jesper Dangaard Brouer
2020-02-19 17:38 ` Andrii Nakryiko
2020-02-19 18:28 ` Jesper Dangaard Brouer
2020-02-19 18:38 ` Andrii Nakryiko
2020-02-19 20:06 ` Jesper Dangaard Brouer
2020-02-19 21:59 ` Daniel Díaz
2020-02-19 22:26 ` Andrii Nakryiko
2020-02-20 0:27 ` Alexei Starovoitov
2020-02-20 0:47 ` shuah
2020-02-20 16:37 ` Jesper Dangaard Brouer
2020-02-20 17:02 ` Bird, Tim
2020-02-20 17:26 ` Alexei Starovoitov
2020-02-20 17:41 ` Bird, Tim
2020-02-20 19:18 ` Alexei Starovoitov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200219133012.7cb6ac9e@carbon \
--to=brouer@redhat.com \
--cc=alexei.starovoitov@gmail.com \
--cc=anders.roxell@linaro.org \
--cc=andrii.nakryiko@gmail.com \
--cc=andriin@fb.com \
--cc=borkmann@iogearbox.net \
--cc=bpf@vger.kernel.org \
--cc=davem@davemloft.net \
--cc=gregkh@linuxfoundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=toke@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).