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    SubjectRe: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf
    Em Wed, Dec 14, 2016 at 02:43:39PM -0800, Joe Stringer escreveu:
    > Now that libbpf under tools/lib/bpf/* is synced with the version from
    > samples/bpf, we can get rid most of the libbpf library here.
    >
    > Signed-off-by: Joe Stringer <joe@ovn.org>
    > Cc: Alexei Starovoitov <ast@fb.com>
    > Cc: Daniel Borkmann <daniel@iogearbox.net>
    > Cc: Wang Nan <wangnan0@huawei.com>
    > Link: http://lkml.kernel.org/r/20161209024620.31660-6-joe@ovn.org
    > [ Use -I$(srctree)/tools/lib/ to support out of source code tree builds, as noticed by Wang Nan ]
    > Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

    So, right before this patch building samples/bpf works, then, after, it fails,
    investigating:

    [root@1e797fdfbf4f linux]# make -j4 O=/tmp/build/linux/ headers_install
    make[1]: Entering directory '/tmp/build/linux'
    CHK include/generated/uapi/linux/version.h
    make[1]: Leaving directory '/tmp/build/linux'
    [root@1e797fdfbf4f linux]# make -j4 O=/tmp/build/linux/ samples/bpf/
    make[1]: Entering directory '/tmp/build/linux'
    CHK include/config/kernel.release
    GEN ./Makefile
    CHK include/generated/uapi/linux/version.h
    Using /git/linux as source for kernel
    CHK include/generated/utsrelease.h
    CHK include/generated/timeconst.h
    CHK include/generated/bounds.h
    CHK include/generated/asm-offsets.h
    CALL /git/linux/scripts/checksyscalls.sh
    HOSTCC samples/bpf/test_lru_dist.o
    HOSTCC samples/bpf/libbpf.o
    HOSTCC samples/bpf/sock_example.o
    HOSTCC samples/bpf/bpf_load.o
    In file included from /git/linux/samples/bpf/libbpf.c:12:0:
    /git/linux/samples/bpf/libbpf.h:5:21: fatal error: bpf/bpf.h: No such file or directory
    #include <bpf/bpf.h>
    ^
    compilation terminated.
    In file included from /git/linux/samples/bpf/test_lru_dist.c:24:0:
    /git/linux/samples/bpf/libbpf.h:5:21: fatal error: bpf/bpf.h: No such file or directory
    #include <bpf/bpf.h>
    ^
    compilation terminated.
    make[2]: *** [scripts/Makefile.host:124: samples/bpf/test_lru_dist.o] Error 1
    make[2]: *** Waiting for unfinished jobs....
    make[2]: *** [scripts/Makefile.host:124: samples/bpf/libbpf.o] Error 1
    In file included from /git/linux/samples/bpf/bpf_load.c:24:0:
    /git/linux/samples/bpf/libbpf.h:5:21: fatal error: bpf/bpf.h: No such file or directory
    #include <bpf/bpf.h>
    ^
    compilation terminated.
    make[2]: *** [scripts/Makefile.host:124: samples/bpf/bpf_load.o] Error 1
    In file included from /git/linux/samples/bpf/sock_example.c:29:0:
    /git/linux/samples/bpf/libbpf.h:5:21: fatal error: bpf/bpf.h: No such file or directory
    #include <bpf/bpf.h>
    ^
    compilation terminated.
    make[2]: *** [scripts/Makefile.host:124: samples/bpf/sock_example.o] Error 1
    make[1]: *** [/git/linux/Makefile:1659: samples/bpf/] Error 2
    make[1]: Leaving directory '/tmp/build/linux'
    make: *** [Makefile:150: sub-make] Error 2
    [root@1e797fdfbf4f linux]#

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