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Date:   Sun, 26 Sep 2021 09:14:49 -0300
From:   Arnaldo Carvalho de Melo <acme@kernel.org>
To:     Jinshan Xiong <jinshan.xiong@gmail.com>
Cc:     jolsa@redhat.com, Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Namhyung Kim <namhyung@kernel.org>,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] tools/lib/perf: make the static libperf complete
Message-ID: <YVBkObnrPfX6KIZM@kernel.org>
References: <20210926023028.2338342-1-jinshan.xiong@gmail.com>
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In-Reply-To: <20210926023028.2338342-1-jinshan.xiong@gmail.com>
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Em Sat, Sep 25, 2021 at 07:30:24PM -0700, Jinshan Xiong escreveu:
> This patch makes libperf.a complete. Initially it misses the symbols
> fdarray_* that makes it unusable:
>    $ nm tools/lib/perf/libperf.a | grep fdarray_
>                     U fdarray__add
>    0000000000002b3e t fdarray__available_entries
>                     U fdarray__exit
>                     U fdarray__filter
>                     U fdarray__grow
>                     U fdarray__init
>                     U fdarray__poll
> 
> After this patch is applied:
>     $ nm tools/lib/perf/libperf.a | grep fdarray_
>     00000000000063f7 T fdarray__add
>     ......
>     00000000000065d4 T fdarray__poll

Have you tried to build tools/perf/ with this?

  LINK    /tmp/build/perf/plugins/plugin_futex.so
  LINK    /tmp/build/perf/plugins/plugin_jbd2.so
  INSTALL trace_plugins
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o):/var/home/acme/git/perf/tools/lib/api/debug.c:20: multiple definition of `__pr_debug'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/debug.c:20: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `sysfs__read_bool':
/var/home/acme/git/perf/tools/lib/api/fs/fs.c:505: multiple definition of `sysfs__read_bool'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fs/fs.c:505: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `fdarray__poll':
/var/home/acme/git/perf/tools/lib/api/fd/array.c:120: multiple definition of `fdarray__poll'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fd/array.c:120: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `tracefs__configured':
/var/home/acme/git/perf/tools/lib/api/fs/fs.c:316: multiple definition of `tracefs__configured'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fs/fs.c:316: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `sysfs__read_int':
/var/home/acme/git/perf/tools/lib/api/fs/fs.c:479: multiple definition of `sysfs__read_int'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fs/fs.c:479: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `fdarray__fprintf':
/var/home/acme/git/perf/tools/lib/api/fd/array.c:125: multiple definition of `fdarray__fprintf'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fd/array.c:125: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `sysfs__write_int':
/var/home/acme/git/perf/tools/lib/api/fs/fs.c:547: multiple definition of `sysfs__write_int'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fs/fs.c:547: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `filename__read_str':
/var/home/acme/git/perf/tools/lib/api/fs/fs.c:378: multiple definition of `filename__read_str'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fs/fs.c:378: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `hugetlbfs__mountpoint':
/var/home/acme/git/perf/tools/lib/api/fs/fs.c:317: multiple definition of `hugetlbfs__mountpoint'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fs/fs.c:317: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `debugfs__mountpoint':
/var/home/acme/git/perf/tools/lib/api/fs/fs.c:315: multiple definition of `debugfs__mountpoint'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fs/fs.c:315: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `fdarray__delete':
/var/home/acme/git/perf/tools/lib/api/fd/array.c:71: multiple definition of `fdarray__delete'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fd/array.c:71: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `procfs__mountpoint':
/var/home/acme/git/perf/tools/lib/api/fs/fs.c:314: multiple definition of `procfs__mountpoint'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fs/fs.c:314: first defined here
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-ar.o): in function `get_tracing_file':
/var/home/acme/git/perf/tools/lib/api/fs/tracing_path.c:74: multiple definition of `get_tracing_file'; /tmp/build/perf/libapi.a(libapi-in.o):/var/home/acme/git/perf/tools/lib/api/fs/tracing_path.c:74: first defined here

You probably need to include libapi.a as well.

- Arnaldo