linux-kernel - Re: [PATCH 7/9] tools/lib/traceevent: traceevent API cleanup

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Date:   Fri, 30 Nov 2018 15:09:44 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tzvetomir Stoyanov <tstoyanov@...are.com>
Subject: Re: [PATCH 7/9] tools/lib/traceevent: traceevent API cleanup

On Fri, 30 Nov 2018 16:18:56 -0300
Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> Em Fri, Nov 30, 2018 at 10:44:10AM -0500, Steven Rostedt escreveu:
> > From: Tzvetomir Stoyanov <tstoyanov@...are.com>
> > 
> > In order to make libtraceevent into a proper library, its API
> > should be straightforward. This patch hides few API functions,
> > intended for internal usage only:
> > tep_free_event(), tep_free_format_field(), __tep_data2host2(),
> > __tep_data2host4() and __tep_data2host8().
> > The patch also alignes the libtraceevent summary man page with
> > these API changes.  
> 
> I applied the previous patches, stopped here as it this one fails with
> the error bellow.
> 
> Please resend from this patch onwards.
> 
> BTW, this is what I have right now:
> 
> [acme@...co perf]$ git log --oneline - 6
> 9db9efe53c72 (HEAD -> perf/core) tools lib traceevent: Rename tep_free_format() to tep_free_event()
> e58c351e8383 tools lib traceevent, perf tools: Rename 'struct tep_event_format' to 'struct tep_event'
> 4237fd0b60d8 tools lib traceevent: Install trace-seq.h API header file
> bb837f2581dc tools lib traceevent: Added support for pkg-config
> a2c167ad70b6 tools lib traceevent: Implement new API tep_get_ref()
> 51d0337d0198 (acme.korg/perf/core) tools lib traceevent: Add sanity check to is_timestamp_in_us()
> 
> - Arnaldo
> 
> [acme@...co perf]$ m
> make: Entering directory '/home/acme/git/perf/tools/perf'
>   BUILD:   Doing 'make -j8' parallel build
>   CC       /tmp/build/perf/util/trace-event-read.o
>   CC       /tmp/build/perf/util/trace-event-scripting.o
>   CC       /tmp/build/perf/util/trace-event.o
>   CC       /tmp/build/perf/util/sort.o
>   CC       /tmp/build/perf/util/hist.o
>   INSTALL  trace_plugins
>   CC       /tmp/build/perf/util/cgroup.o
>   CC       /tmp/build/perf/util/stat.o
>   CC       /tmp/build/perf/util/stat-shadow.o
>   CC       /tmp/build/perf/util/stat-display.o
>   CC       /tmp/build/perf/util/record.o
> util/trace-event-read.c: In function ‘read4’:
> util/trace-event-read.c:105:9: error: implicit declaration of function ‘__tep_data2host4’; did you mean ‘tep_data_flags’? [-Werror=implicit-function-declaration]
>   return __tep_data2host4(pevent, data);
>          ^~~~~~~~~~~~~~~~
>          tep_data_flags

This should have been changed with patch 6 in the series.

-- Steve

> util/trace-event-read.c:105:9: error: nested extern declaration of ‘__tep_data2host4’ [-Werror=nested-externs]
> util/trace-event-read.c: In function ‘read8’:
> util/trace-event-read.c:114:9: error: implicit declaration of function ‘__tep_data2host8’; did you mean ‘tep_data_flags’? [-Werror=implicit-function-declaration]
>   return __tep_data2host8(pevent, data);
>          ^~~~~~~~~~~~~~~~
>          tep_data_flags
> util/trace-event-read.c:114:9: error: nested extern declaration of ‘__tep_data2host8’ [-Werror=nested-externs]
> cc1: all warnings being treated as errors
> mv: cannot stat '/tmp/build/perf/util/.trace-event-read.o.tmp': No such file or directory
> make[4]: *** [/home/acme/git/perf/tools/build/Makefile.build:96: /tmp/build/perf/util/trace-event-read.o] Error 1
> make[4]: *** Waiting for unfinished jobs....
> make[3]: *** [/home/acme/git/perf/tools/build/Makefile.build:139: util] Error 2
> make[2]: *** [Makefile.perf:658: /tmp/build/perf/libperf-in.o] Error 2
> make[1]: *** [Makefile.perf:215: sub-make] Error 2
> make: *** [Makefile:110: install-bin] Error 2
> make: Leaving directory '/home/acme/git/perf/tools/perf'
> 
>  Performance counter stats for 'make -k O=/tmp/build/perf -C tools/perf install-bin':
> 
>     20,606,463,070      cycles:u
>     24,937,056,161      instructions:u            #    1.21  insn per cycle
> 
>        2.192507189 seconds time elapsed
> 
>        5.571323000 seconds user
>        0.994057000 seconds sys
> 
> 
> [acme@...co perf]$