linux-kernel - Re: [PATCH 01/12] perf tools: Enable LIBBABELTRACE by default

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Date:   Mon, 8 Jan 2018 18:11:22 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: [PATCH 01/12] perf tools: Enable LIBBABELTRACE by default

On Mon, Jan 08, 2018 at 12:24:33PM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> 
> Works:
> 
> [acme@...et perf]$ ldd ~/bin/perf | grep babel
> 	libbabeltrace-ctf.so.1 => /lib64/libbabeltrace-ctf.so.1 (0x00007fcb688d0000)
> 	libbabeltrace.so.1 => /lib64/libbabeltrace.so.1 (0x00007fcb67e92000)
> [acme@...et perf]$ rpm -q libbabeltrace-devel
> libbabeltrace-devel-1.5.3-1.fc27.x86_64
> [acme@...et perf]$
> 
> But then, if we show:
> 
> Auto-detecting system features:
> ...                         dwarf: [ on  ]
> ...            dwarf_getlocations: [ on  ]
> ...                         glibc: [ on  ]
> ...                          gtk2: [ on  ]
> ...                      libaudit: [ on  ]
> ...                        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  ]
> 
> Shoudln't we tell the user that babeltrace was linked too?

the logic is just to simply display the state of features
which we provide in FEATURE_DISPLAY variable, which is
believed to be common and important enough to display
status about

maybe we could display it with 'make VF=1' output?

jirka