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    SubjectRe: [PATCH v2 4/4] perf: Support perf -vv
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    On 3/28/2018 9:22 PM, Jiri Olsa wrote:
    > On Wed, Mar 28, 2018 at 10:57:08PM +0800, Jin Yao wrote:
    >> We keep having bug reports that when users build perf on their own,
    >> but they don't install some needed libraries such as libelf,
    >> libbfd/libibery.
    >>
    >> The perf can build, but it is missing important functionality.
    >>
    >> This patch provides a new option '-vv' which will print the
    >> compiled-in status of libraries.
    >>
    >> The 'perf -vv' is equal to 'perf -version --build-options'.
    >>
    >> For example:
    >>
    >> $ ./perf -vv or ./perf -version --build-options
    >> perf version 4.13.rc5.gcb1183
    >> dwarf: [ on ]
    >> dwarf_getlocations: [ on ]
    >> glibc: [ on ]
    >> gtk2: [ on ]
    >> libaudit: [ OFF ]
    >> libbfd: [ on ]
    >> libelf: [ on ]
    >> libnuma: [ on ]
    >> numa_num_possible_cpus: [ on ]
    >> libperl: [ on ]
    >> libpython: [ on ]
    >> libslang: [ on ]
    >> libcrypto: [ on ]
    >> libunwind: [ on ]
    >> libdw-dwarf-unwind: [ on ]
    >> zlib: [ on ]
    >> lzma: [ on ]
    >> get_cpuid: [ on ]
    >> bpf: [ on ]
    >> [ on ]: library is compiled-in
    >> [ OFF ]: library is disabled in make configuration
    >> OR library is not installed in build environment
    >>
    >> v2:
    >> ---
    >> Use a global variable version_verbose to count the number of 'v'.
    >>
    >> Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
    >> ---
    >> tools/perf/perf.c | 22 ++++++++++++++++++----
    >> tools/perf/perf.h | 1 +
    >> 2 files changed, 19 insertions(+), 4 deletions(-)
    >>
    >> diff --git a/tools/perf/perf.c b/tools/perf/perf.c
    >> index 1b3fc8e..355219e 100644
    >> --- a/tools/perf/perf.c
    >> +++ b/tools/perf/perf.c
    >> @@ -32,7 +32,7 @@
    >> #include <linux/kernel.h>
    >>
    >> const char perf_usage_string[] =
    >> - "perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
    >> + "perf [--version [--build-options]] [--help] [OPTIONS] COMMAND [ARGS]";
    >
    > --build-options is 'perf version' option no?
    >
    > jirka
    >

    Yes. Command-line something like:

    perf --version --build-options or perf -v --build-options.

    Is this usage string not correct? If so, I'd like to fix that.

    "perf [--version [--build-options]] [--help] [OPTIONS] COMMAND [ARGS]";

    Thanks
    Jin Yao

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