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Date: Tue, 2 Jun 2015 19:11:56 -0300
From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Wang Nan <wangnan0@huawei.com>
Cc: namhyung@kernel.org, alexei.starovoitov@gmail.com,
        masami.hiramatsu.pt@hitachi.com, paulus@samba.org,
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        lizefan@huawei.com, hekuang@huawei.com, xiakaixu@huawei.com,
        linux-kernel@vger.kernel.org, pi3orama@163.com
Subject: Re: [RFC PATCH v5 03/30] tools build: Add feature check for eBPF API
Message-ID: <20150602221156.GT624@kernel.org>
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Em Mon, Jun 01, 2015 at 07:37:49AM +0000, Wang Nan escreveu:
> In this patch, eBPF API is checked by compiling a c source file which
> uses fields in bpf_attr which will be used by libbpf.

Something is missing, where is the message saying that I need to install
something to have bpf support? Look at the liblzma one at config/Makefile:556:

[acme@zoo linux]$ rm -rf /tmp/build/perf ; mkdir -p /tmp/build/perf ; m
make: Entering directory '/home/git/linux/tools/perf'
  BUILD:   Doing 'make -j4' parallel build

Auto-detecting system features:
...                         dwarf: [ OFF ]
...                         glibc: [ on  ]
...                          gtk2: [ on  ]
...                      libaudit: [ OFF ]
...                        libbfd: [ on  ]
...                        libelf: [ OFF ]
...                       libnuma: [ OFF ]
...                       libperl: [ on  ]
...                     libpython: [ OFF ]
...                      libslang: [ OFF ]
...                     libunwind: [ OFF ]
...            libdw-dwarf-unwind: [ OFF ]
...                          zlib: [ OFF ]
...                          lzma: [ OFF ]
...                           bpf: [ OFF ]

config/Makefile:245: No libelf found, disables 'probe' tool, please install elfutils-libelf-devel/libelf-dev
config/Makefile:325: Disabling post unwind, no support found.
config/Makefile:366: No libaudit.h found, disables 'trace' tool, please install audit-libs-devel or libaudit-dev
config/Makefile:381: slang not found, disables TUI support. Please install slang-devel or libslang-dev
config/Makefile:466: No 'Python.h' (for Python 2.x support) was found: disables Python support - please install python-devel/python-dev
config/Makefile:556: No liblzma found, disables xz kernel module decompression, please install xz-devel/liblzma-dev
config/Makefile:569: No numa.h found, disables 'perf bench numa mem' benchmark, please install numactl-devel/libnuma-devel/libnuma-dev
  MKDIR    /tmp/build/perf/util/
  CC       /tmp/build/perf/util/abspath.o


Applied the first two patches in this series, will push them soon.

- Arnaldo
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