Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf

[Arnaldo Carvalho de Melo <acme@kernel.org>]

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]#