* samples don't build on v4.18
@ 2018-08-15 1:20 Joel Fernandes
2018-08-15 1:22 ` Joel Fernandes
0 siblings, 1 reply; 5+ messages in thread
From: Joel Fernandes @ 2018-08-15 1:20 UTC (permalink / raw)
To: linux-kernel, wangnan0, netdev, ast, acme, fengc
Hi,
When building BPF samples on v4.18, I get the following errors:
$ cd samples/bpf/
$ make
Auto-detecting system features:
... libelf: [ OFF ]
... bpf: [ OFF ]
No libelf found
Makefile:213: recipe for target 'elfdep' failed
-----------
I bissected it down to commit 5f9380572b4bb24f60cd492b1
Author: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Thu May 10 10:24:39 2018 -0700
samples: bpf: compile and link against full libbpf
---------
Checking out a kernel before this commit makes the samples build. Also I do
have libelf on my system.
Any thoughts on this issue?
thank you,
- Joel
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: samples don't build on v4.18 2018-08-15 1:20 samples don't build on v4.18 Joel Fernandes @ 2018-08-15 1:22 ` Joel Fernandes 2018-08-15 3:01 ` Joel Fernandes 0 siblings, 1 reply; 5+ messages in thread From: Joel Fernandes @ 2018-08-15 1:22 UTC (permalink / raw) To: LKML, wangnan0, open list:BPF (Safe dynamic programs and tools), Alexei Starovoitov, acme, Chenbo Feng, Jakub Kicinski Forgot to add the patch author, doing so now. thanks On Tue, Aug 14, 2018 at 6:20 PM, Joel Fernandes <joelaf@google.com> wrote: > > Hi, > When building BPF samples on v4.18, I get the following errors: > > $ cd samples/bpf/ > $ make > > Auto-detecting system features: > ... libelf: [ OFF ] > ... bpf: [ OFF ] > > No libelf found > Makefile:213: recipe for target 'elfdep' failed > ----------- > > I bissected it down to commit 5f9380572b4bb24f60cd492b1 > > Author: Jakub Kicinski <jakub.kicinski@netronome.com> > Date: Thu May 10 10:24:39 2018 -0700 > > samples: bpf: compile and link against full libbpf > --------- > > Checking out a kernel before this commit makes the samples build. Also I do > have libelf on my system. > > Any thoughts on this issue? > > thank you, > > - Joel ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: samples don't build on v4.18 2018-08-15 1:22 ` Joel Fernandes @ 2018-08-15 3:01 ` Joel Fernandes 2018-08-15 19:34 ` Jakub Kicinski 0 siblings, 1 reply; 5+ messages in thread From: Joel Fernandes @ 2018-08-15 3:01 UTC (permalink / raw) To: LKML, wangnan0, open list:BPF (Safe dynamic programs and tools), Alexei Starovoitov, acme, Chenbo Feng, Jakub Kicinski On Tue, Aug 14, 2018 at 06:22:21PM -0700, Joel Fernandes wrote: > Forgot to add the patch author, doing so now. thanks > > On Tue, Aug 14, 2018 at 6:20 PM, Joel Fernandes <joelaf@google.com> wrote: > > > > Hi, > > When building BPF samples on v4.18, I get the following errors: > > > > $ cd samples/bpf/ > > $ make > > > > Auto-detecting system features: > > ... libelf: [ OFF ] > > ... bpf: [ OFF ] > > > > No libelf found > > Makefile:213: recipe for target 'elfdep' failed > > ----------- > > > > I bissected it down to commit 5f9380572b4bb24f60cd492b1 > > > > Author: Jakub Kicinski <jakub.kicinski@netronome.com> > > Date: Thu May 10 10:24:39 2018 -0700 > > > > samples: bpf: compile and link against full libbpf > > --------- > > > > Checking out a kernel before this commit makes the samples build. Also I do > > have libelf on my system. > > > > Any thoughts on this issue? There is some weirdness going on with my kernel tree. If I do a fresh clone of v4.18 and build samples, everything works. However if I take my existing checkout, do a: git clean -f -d make mrproper Then I try to build the samples, I get the "No libelf found". Obviously the existing checked out kernel tree is in some weird state that I am not yet able to fix. But atleast if I blow the whole tree and clone again, I'm able to build... Is this related to the intermittent "No libelf found" issues that were recently discussed? - Joel ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: samples don't build on v4.18 2018-08-15 3:01 ` Joel Fernandes @ 2018-08-15 19:34 ` Jakub Kicinski 2018-08-16 20:55 ` Joel Fernandes 0 siblings, 1 reply; 5+ messages in thread From: Jakub Kicinski @ 2018-08-15 19:34 UTC (permalink / raw) To: Joel Fernandes Cc: LKML, wangnan0, open list:BPF (Safe dynamic programs and tools), Alexei Starovoitov, acme, Chenbo Feng On Tue, 14 Aug 2018 20:01:32 -0700, Joel Fernandes wrote: > On Tue, Aug 14, 2018 at 06:22:21PM -0700, Joel Fernandes wrote: > > Forgot to add the patch author, doing so now. thanks > > > > On Tue, Aug 14, 2018 at 6:20 PM, Joel Fernandes <joelaf@google.com> wrote: > > > > > > Hi, > > > When building BPF samples on v4.18, I get the following errors: > > > > > > $ cd samples/bpf/ > > > $ make > > > > > > Auto-detecting system features: > > > ... libelf: [ OFF ] > > > ... bpf: [ OFF ] > > > > > > No libelf found > > > Makefile:213: recipe for target 'elfdep' failed > > > ----------- > > > > > > I bissected it down to commit 5f9380572b4bb24f60cd492b1 > > > > > > Author: Jakub Kicinski <jakub.kicinski@netronome.com> > > > Date: Thu May 10 10:24:39 2018 -0700 > > > > > > samples: bpf: compile and link against full libbpf > > > --------- > > > > > > Checking out a kernel before this commit makes the samples build. Also I do > > > have libelf on my system. > > > > > > Any thoughts on this issue? > > There is some weirdness going on with my kernel tree. If I do a fresh clone > of v4.18 and build samples, everything works. > > However if I take my existing checkout, do a: > git clean -f -d > make mrproper > > Then I try to build the samples, I get the "No libelf found". > > Obviously the existing checked out kernel tree is in some weird state that I > am not yet able to fix. But atleast if I blow the whole tree and clone again, > I'm able to build... > > Is this related to the intermittent "No libelf found" issues that were > recently discussed? Can't reproduce, could you provide all exact commands you run to see this, including the initial clone? 12:32 linux$ git clean -f -d 12:32 linux$ make mrproper CLEAN . CLEAN arch/x86/tools CLEAN .tmp_versions CLEAN scripts/basic CLEAN scripts/kconfig CLEAN scripts/mod CLEAN scripts CLEAN include/config usr/include include/generated arch/x86/include/generated CLEAN .config .config.old 12:32 linux$ make defconfig HOSTCC scripts/basic/fixdep HOSTCC scripts/kconfig/conf.o YACC scripts/kconfig/zconf.tab.c LEX scripts/kconfig/zconf.lex.c HOSTCC scripts/kconfig/zconf.tab.o HOSTLD scripts/kconfig/conf *** Default configuration is based on 'x86_64_defconfig' # # configuration written to .config # 12:32 linux$ make headers_install UPD include/generated/uapi/linux/version.h WRAP arch/x86/include/generated/uapi/asm/bpf_perf_event.h WRAP arch/x86/include/generated/uapi/asm/poll.h SYSTBL arch/x86/include/generated/asm/syscalls_32.h SYSHDR arch/x86/include/generated/uapi/asm/unistd_32.h SYSHDR arch/x86/include/generated/uapi/asm/unistd_64.h SYSHDR arch/x86/include/generated/uapi/asm/unistd_x32.h HOSTCC arch/x86/tools/relocs_32.o HOSTCC arch/x86/tools/relocs_64.o HOSTCC arch/x86/tools/relocs_common.o HOSTLD arch/x86/tools/relocs HOSTCC scripts/unifdef INSTALL usr/include/asm-generic/ (37 files) INSTALL usr/include/drm/ (26 files) INSTALL usr/include/linux/ (497 files) INSTALL usr/include/linux/android/ (1 file) INSTALL usr/include/linux/byteorder/ (2 files) INSTALL usr/include/linux/caif/ (2 files) INSTALL usr/include/linux/can/ (6 files) INSTALL usr/include/linux/cifs/ (1 file) INSTALL usr/include/linux/dvb/ (8 files) INSTALL usr/include/linux/genwqe/ (1 file) INSTALL usr/include/linux/hdlc/ (1 file) INSTALL usr/include/linux/hsi/ (2 files) INSTALL usr/include/linux/iio/ (2 files) INSTALL usr/include/linux/isdn/ (1 file) INSTALL usr/include/linux/mmc/ (1 file) INSTALL usr/include/linux/netfilter/ (88 files) INSTALL usr/include/linux/netfilter/ipset/ (4 files) INSTALL usr/include/linux/netfilter_arp/ (2 files) INSTALL usr/include/linux/netfilter_bridge/ (17 files) INSTALL usr/include/linux/netfilter_ipv4/ (9 files) INSTALL usr/include/linux/netfilter_ipv6/ (13 files) INSTALL usr/include/linux/nfsd/ (5 files) INSTALL usr/include/linux/raid/ (2 files) INSTALL usr/include/linux/sched/ (1 file) INSTALL usr/include/linux/spi/ (1 file) INSTALL usr/include/linux/sunrpc/ (1 file) INSTALL usr/include/linux/tc_act/ (15 files) INSTALL usr/include/linux/tc_ematch/ (5 files) INSTALL usr/include/linux/usb/ (12 files) INSTALL usr/include/linux/wimax/ (1 file) INSTALL usr/include/misc/ (2 files) INSTALL usr/include/mtd/ (5 files) INSTALL usr/include/rdma/ (25 files) INSTALL usr/include/rdma/hfi/ (2 files) INSTALL usr/include/scsi/ (4 files) INSTALL usr/include/scsi/fc/ (4 files) INSTALL usr/include/sound/ (16 files) INSTALL usr/include/video/ (3 files) INSTALL usr/include/xen/ (4 files) INSTALL usr/include/asm/ (62 files) 12:32 linux$ cd samples/bpf/ 12:32 bpf$ make LLC=llc-6.0 LLVM_OBJCOPY=llvm-objcopy-6.0 CLANG=clang-6.0 make -C ../../ /tmp/linux/samples/bpf/ BPF_SAMPLES_PATH=/tmp/linux/samples/bpf make[1]: Entering directory '/tmp/linux' scripts/kconfig/conf --syncconfig Kconfig SYSHDR arch/x86/include/generated/asm/unistd_32_ia32.h SYSHDR arch/x86/include/generated/asm/unistd_64_x32.h SYSTBL arch/x86/include/generated/asm/syscalls_64.h UPD include/config/kernel.release WRAP arch/x86/include/generated/asm/dma-contiguous.h WRAP arch/x86/include/generated/asm/early_ioremap.h WRAP arch/x86/include/generated/asm/mcs_spinlock.h WRAP arch/x86/include/generated/asm/mm-arch-hooks.h UPD include/generated/utsrelease.h CC kernel/bounds.s UPD include/generated/bounds.h UPD include/generated/timeconst.h CC arch/x86/kernel/asm-offsets.s UPD include/generated/asm-offsets.h CALL scripts/checksyscalls.sh DESCEND objtool HOSTCC /tmp/linux/tools/objtool/fixdep.o HOSTLD /tmp/linux/tools/objtool/fixdep-in.o LINK /tmp/linux/tools/objtool/fixdep CC /tmp/linux/tools/objtool/exec-cmd.o CC /tmp/linux/tools/objtool/help.o CC /tmp/linux/tools/objtool/pager.o CC /tmp/linux/tools/objtool/parse-options.o CC /tmp/linux/tools/objtool/run-command.o CC /tmp/linux/tools/objtool/sigchain.o CC /tmp/linux/tools/objtool/subcmd-config.o LD /tmp/linux/tools/objtool/libsubcmd-in.o AR /tmp/linux/tools/objtool/libsubcmd.a CC /tmp/linux/tools/objtool/arch/x86/decode.o LD /tmp/linux/tools/objtool/arch/x86/objtool-in.o CC /tmp/linux/tools/objtool/builtin-check.o CC /tmp/linux/tools/objtool/builtin-orc.o CC /tmp/linux/tools/objtool/check.o CC /tmp/linux/tools/objtool/orc_gen.o CC /tmp/linux/tools/objtool/orc_dump.o CC /tmp/linux/tools/objtool/elf.o CC /tmp/linux/tools/objtool/special.o CC /tmp/linux/tools/objtool/objtool.o CC /tmp/linux/tools/objtool/libstring.o CC /tmp/linux/tools/objtool/str_error_r.o LD /tmp/linux/tools/objtool/objtool-in.o LINK /tmp/linux/tools/objtool/objtool CC scripts/mod/empty.o HOSTCC scripts/mod/mk_elfconfig MKELF scripts/mod/elfconfig.h HOSTCC scripts/mod/modpost.o CC scripts/mod/devicetable-offsets.s UPD scripts/mod/devicetable-offsets.h HOSTCC scripts/mod/file2alias.o HOSTCC scripts/mod/sumversion.o HOSTLD scripts/mod/modpost HOSTCC scripts/selinux/genheaders/genheaders HOSTCC scripts/selinux/mdp/mdp HOSTCC scripts/kallsyms HOSTCC scripts/pnmtologo HOSTCC scripts/conmakehash HOSTCC scripts/sortextable HOSTCC scripts/asn1_compiler HOSTCC scripts/extract-cert make -C /tmp/linux/samples/bpf/../../tools/lib/bpf/ RM='rm -rf' LDFLAGS= srctree=/tmp/linux/samples/bpf/../../ O= HOSTCC fixdep.o HOSTLD fixdep-in.o LINK fixdep CC libbpf.o CC bpf.o CC nlattr.o CC btf.o LD libbpf-in.o LINK libbpf.a LINK libbpf.so HOSTCC /tmp/linux/samples/bpf/test_lru_dist HOSTCC /tmp/linux/samples/bpf/sock_example HOSTCC /tmp/linux/samples/bpf/bpf_load.o HOSTCC /tmp/linux/samples/bpf/fds_example.o HOSTLD /tmp/linux/samples/bpf/fds_example HOSTCC /tmp/linux/samples/bpf/sockex1_user.o HOSTLD /tmp/linux/samples/bpf/sockex1 HOSTCC /tmp/linux/samples/bpf/sockex2_user.o HOSTLD /tmp/linux/samples/bpf/sockex2 HOSTCC /tmp/linux/samples/bpf/sockex3_user.o HOSTLD /tmp/linux/samples/bpf/sockex3 HOSTCC /tmp/linux/samples/bpf/tracex1_user.o HOSTLD /tmp/linux/samples/bpf/tracex1 HOSTCC /tmp/linux/samples/bpf/tracex2_user.o HOSTLD /tmp/linux/samples/bpf/tracex2 HOSTCC /tmp/linux/samples/bpf/tracex3_user.o HOSTLD /tmp/linux/samples/bpf/tracex3 HOSTCC /tmp/linux/samples/bpf/tracex4_user.o HOSTLD /tmp/linux/samples/bpf/tracex4 HOSTCC /tmp/linux/samples/bpf/tracex5_user.o HOSTLD /tmp/linux/samples/bpf/tracex5 HOSTCC /tmp/linux/samples/bpf/tracex6_user.o HOSTLD /tmp/linux/samples/bpf/tracex6 HOSTCC /tmp/linux/samples/bpf/tracex7_user.o HOSTLD /tmp/linux/samples/bpf/tracex7 HOSTCC /tmp/linux/samples/bpf/test_probe_write_user_user.o HOSTLD /tmp/linux/samples/bpf/test_probe_write_user HOSTCC /tmp/linux/samples/bpf/trace_output_user.o HOSTCC /tmp/linux/samples/bpf/../../tools/testing/selftests/bpf/trace_helpers.o HOSTLD /tmp/linux/samples/bpf/trace_output HOSTCC /tmp/linux/samples/bpf/lathist_user.o HOSTLD /tmp/linux/samples/bpf/lathist HOSTCC /tmp/linux/samples/bpf/offwaketime_user.o HOSTLD /tmp/linux/samples/bpf/offwaketime HOSTCC /tmp/linux/samples/bpf/spintest_user.o HOSTLD /tmp/linux/samples/bpf/spintest HOSTCC /tmp/linux/samples/bpf/map_perf_test_user.o HOSTLD /tmp/linux/samples/bpf/map_perf_test HOSTCC /tmp/linux/samples/bpf/test_overhead_user.o HOSTLD /tmp/linux/samples/bpf/test_overhead HOSTCC /tmp/linux/samples/bpf/test_cgrp2_array_pin.o HOSTLD /tmp/linux/samples/bpf/test_cgrp2_array_pin HOSTCC /tmp/linux/samples/bpf/test_cgrp2_attach.o HOSTLD /tmp/linux/samples/bpf/test_cgrp2_attach HOSTCC /tmp/linux/samples/bpf/test_cgrp2_attach2.o HOSTCC /tmp/linux/samples/bpf/../../tools/testing/selftests/bpf/cgroup_helpers.o HOSTLD /tmp/linux/samples/bpf/test_cgrp2_attach2 HOSTCC /tmp/linux/samples/bpf/test_cgrp2_sock.o HOSTLD /tmp/linux/samples/bpf/test_cgrp2_sock HOSTCC /tmp/linux/samples/bpf/test_cgrp2_sock2.o HOSTLD /tmp/linux/samples/bpf/test_cgrp2_sock2 HOSTCC /tmp/linux/samples/bpf/xdp1_user.o HOSTLD /tmp/linux/samples/bpf/xdp1 HOSTLD /tmp/linux/samples/bpf/xdp2 HOSTCC /tmp/linux/samples/bpf/xdp_router_ipv4_user.o HOSTLD /tmp/linux/samples/bpf/xdp_router_ipv4 HOSTCC /tmp/linux/samples/bpf/test_current_task_under_cgroup_user.o HOSTLD /tmp/linux/samples/bpf/test_current_task_under_cgroup HOSTCC /tmp/linux/samples/bpf/trace_event_user.o HOSTLD /tmp/linux/samples/bpf/trace_event HOSTCC /tmp/linux/samples/bpf/sampleip_user.o HOSTLD /tmp/linux/samples/bpf/sampleip HOSTCC /tmp/linux/samples/bpf/tc_l2_redirect_user.o HOSTLD /tmp/linux/samples/bpf/tc_l2_redirect HOSTCC /tmp/linux/samples/bpf/lwt_len_hist_user.o HOSTLD /tmp/linux/samples/bpf/lwt_len_hist HOSTCC /tmp/linux/samples/bpf/xdp_tx_iptunnel_user.o HOSTLD /tmp/linux/samples/bpf/xdp_tx_iptunnel HOSTCC /tmp/linux/samples/bpf/test_map_in_map_user.o HOSTLD /tmp/linux/samples/bpf/test_map_in_map HOSTCC /tmp/linux/samples/bpf/cookie_uid_helper_example.o HOSTLD /tmp/linux/samples/bpf/per_socket_stats_example HOSTCC /tmp/linux/samples/bpf/load_sock_ops.o HOSTLD /tmp/linux/samples/bpf/load_sock_ops HOSTCC /tmp/linux/samples/bpf/xdp_redirect_user.o HOSTLD /tmp/linux/samples/bpf/xdp_redirect HOSTCC /tmp/linux/samples/bpf/xdp_redirect_map_user.o HOSTLD /tmp/linux/samples/bpf/xdp_redirect_map HOSTCC /tmp/linux/samples/bpf/xdp_redirect_cpu_user.o HOSTLD /tmp/linux/samples/bpf/xdp_redirect_cpu HOSTCC /tmp/linux/samples/bpf/xdp_monitor_user.o HOSTLD /tmp/linux/samples/bpf/xdp_monitor HOSTCC /tmp/linux/samples/bpf/xdp_rxq_info_user.o HOSTLD /tmp/linux/samples/bpf/xdp_rxq_info HOSTCC /tmp/linux/samples/bpf/syscall_tp_user.o HOSTLD /tmp/linux/samples/bpf/syscall_tp HOSTCC /tmp/linux/samples/bpf/cpustat_user.o HOSTLD /tmp/linux/samples/bpf/cpustat HOSTCC /tmp/linux/samples/bpf/xdp_adjust_tail_user.o HOSTLD /tmp/linux/samples/bpf/xdp_adjust_tail HOSTCC /tmp/linux/samples/bpf/xdpsock_user.o HOSTLD /tmp/linux/samples/bpf/xdpsock HOSTCC /tmp/linux/samples/bpf/xdp_fwd_user.o HOSTLD /tmp/linux/samples/bpf/xdp_fwd HOSTCC /tmp/linux/samples/bpf/task_fd_query_user.o HOSTLD /tmp/linux/samples/bpf/task_fd_query CC /tmp/linux/samples/bpf/syscall_nrs.s CLANG-bpf /tmp/linux/samples/bpf/sockex1_kern.o CLANG-bpf /tmp/linux/samples/bpf/sockex2_kern.o CLANG-bpf /tmp/linux/samples/bpf/sockex3_kern.o CLANG-bpf /tmp/linux/samples/bpf/tracex1_kern.o CLANG-bpf /tmp/linux/samples/bpf/tracex2_kern.o CLANG-bpf /tmp/linux/samples/bpf/tracex3_kern.o CLANG-bpf /tmp/linux/samples/bpf/tracex4_kern.o CLANG-bpf /tmp/linux/samples/bpf/tracex5_kern.o CLANG-bpf /tmp/linux/samples/bpf/tracex6_kern.o CLANG-bpf /tmp/linux/samples/bpf/tracex7_kern.o CLANG-bpf /tmp/linux/samples/bpf/sock_flags_kern.o CLANG-bpf /tmp/linux/samples/bpf/test_probe_write_user_kern.o CLANG-bpf /tmp/linux/samples/bpf/trace_output_kern.o CLANG-bpf /tmp/linux/samples/bpf/tcbpf1_kern.o CLANG-bpf /tmp/linux/samples/bpf/tc_l2_redirect_kern.o CLANG-bpf /tmp/linux/samples/bpf/lathist_kern.o CLANG-bpf /tmp/linux/samples/bpf/offwaketime_kern.o CLANG-bpf /tmp/linux/samples/bpf/spintest_kern.o CLANG-bpf /tmp/linux/samples/bpf/map_perf_test_kern.o CLANG-bpf /tmp/linux/samples/bpf/test_overhead_tp_kern.o CLANG-bpf /tmp/linux/samples/bpf/test_overhead_raw_tp_kern.o CLANG-bpf /tmp/linux/samples/bpf/test_overhead_kprobe_kern.o CLANG-bpf /tmp/linux/samples/bpf/parse_varlen.o CLANG-bpf /tmp/linux/samples/bpf/parse_simple.o CLANG-bpf /tmp/linux/samples/bpf/parse_ldabs.o CLANG-bpf /tmp/linux/samples/bpf/test_cgrp2_tc_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp1_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp2_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp_router_ipv4_kern.o CLANG-bpf /tmp/linux/samples/bpf/test_current_task_under_cgroup_kern.o CLANG-bpf /tmp/linux/samples/bpf/trace_event_kern.o CLANG-bpf /tmp/linux/samples/bpf/sampleip_kern.o CLANG-bpf /tmp/linux/samples/bpf/lwt_len_hist_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp_tx_iptunnel_kern.o CLANG-bpf /tmp/linux/samples/bpf/test_map_in_map_kern.o CLANG-bpf /tmp/linux/samples/bpf/tcp_synrto_kern.o CLANG-bpf /tmp/linux/samples/bpf/tcp_rwnd_kern.o CLANG-bpf /tmp/linux/samples/bpf/tcp_bufs_kern.o CLANG-bpf /tmp/linux/samples/bpf/tcp_cong_kern.o CLANG-bpf /tmp/linux/samples/bpf/tcp_iw_kern.o CLANG-bpf /tmp/linux/samples/bpf/tcp_clamp_kern.o CLANG-bpf /tmp/linux/samples/bpf/tcp_basertt_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp_redirect_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp_redirect_map_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp_redirect_cpu_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp_monitor_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp_rxq_info_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp2skb_meta_kern.o CLANG-bpf /tmp/linux/samples/bpf/syscall_tp_kern.o CLANG-bpf /tmp/linux/samples/bpf/cpustat_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp_adjust_tail_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdpsock_kern.o CLANG-bpf /tmp/linux/samples/bpf/xdp_fwd_kern.o CLANG-bpf /tmp/linux/samples/bpf/task_fd_query_kern.o make[1]: Leaving directory '/tmp/linux' ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: samples don't build on v4.18 2018-08-15 19:34 ` Jakub Kicinski @ 2018-08-16 20:55 ` Joel Fernandes 0 siblings, 0 replies; 5+ messages in thread From: Joel Fernandes @ 2018-08-16 20:55 UTC (permalink / raw) To: Jakub Kicinski Cc: LKML, wangnan0, open list:BPF (Safe dynamic programs and tools), Alexei Starovoitov, acme, Chenbo Feng On Wed, Aug 15, 2018 at 12:34 PM, Jakub Kicinski <jakub.kicinski@netronome.com> wrote: > On Tue, 14 Aug 2018 20:01:32 -0700, Joel Fernandes wrote: >> On Tue, Aug 14, 2018 at 06:22:21PM -0700, Joel Fernandes wrote: >> > Forgot to add the patch author, doing so now. thanks >> > >> > On Tue, Aug 14, 2018 at 6:20 PM, Joel Fernandes <joelaf@google.com> wrote: >> > > >> > > Hi, >> > > When building BPF samples on v4.18, I get the following errors: >> > > >> > > $ cd samples/bpf/ >> > > $ make >> > > >> > > Auto-detecting system features: >> > > ... libelf: [ OFF ] >> > > ... bpf: [ OFF ] >> > > >> > > No libelf found >> > > Makefile:213: recipe for target 'elfdep' failed >> > > ----------- >> > > >> > > I bissected it down to commit 5f9380572b4bb24f60cd492b1 >> > > >> > > Author: Jakub Kicinski <jakub.kicinski@netronome.com> >> > > Date: Thu May 10 10:24:39 2018 -0700 >> > > >> > > samples: bpf: compile and link against full libbpf >> > > --------- >> > > >> > > Checking out a kernel before this commit makes the samples build. Also I do >> > > have libelf on my system. >> > > >> > > Any thoughts on this issue? >> >> There is some weirdness going on with my kernel tree. If I do a fresh clone >> of v4.18 and build samples, everything works. >> >> However if I take my existing checkout, do a: >> git clean -f -d >> make mrproper >> >> Then I try to build the samples, I get the "No libelf found". >> >> Obviously the existing checked out kernel tree is in some weird state that I >> am not yet able to fix. But atleast if I blow the whole tree and clone again, >> I'm able to build... >> >> Is this related to the intermittent "No libelf found" issues that were >> recently discussed? > > Can't reproduce, could you provide all exact commands you run to see > this, including the initial clone? Not sure if you saw that I replied to my own email. As I was saying, doing a fresh clone and build of the kernel tree makes things work for me. The problematic kernel tree which I cloned many months ago was the one I was using when I reported the issue. On the problematic tree, the steps I did to reproduce issue were: git clean -f -d make mrproper make x86_64_defconfig cd samples/bpf/ make I have since moved onto using the fresh cloned tree since that's working for me. I will let you know if I run into this again. Thanks for your time! - Joel ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-08-16 20:55 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-08-15 1:20 samples don't build on v4.18 Joel Fernandes 2018-08-15 1:22 ` Joel Fernandes 2018-08-15 3:01 ` Joel Fernandes 2018-08-15 19:34 ` Jakub Kicinski 2018-08-16 20:55 ` Joel Fernandes
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