linux-kernel - Re: [PATCH 2/3] libperf: avoid redefining _GNU

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Date:   Fri, 6 Mar 2020 08:38:55 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Igor Lubashev <ilubashe@...mai.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Wei Li <liwei391@...wei.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/3] libperf: avoid redefining _GNU_SOURCE in test

Em Thu, Mar 05, 2020 at 11:11:09PM -0800, Ian Rogers escreveu:
> _GNU_SOURCE needs to be globally defined to pick up features like
> asprintf. Add a guard against redefinition in this test.

Humm, so you're completely sure that the Makefiles that drive the build
of this file don't set _GNU_SOURCE? I.e. some explanation in the cset
log message about that would help in processing the patch,

- Arnaldo
 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/lib/perf/tests/test-evlist.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/lib/perf/tests/test-evlist.c b/tools/lib/perf/tests/test-evlist.c
> index 6d8ebe0c2504..5a5ff104b668 100644
> --- a/tools/lib/perf/tests/test-evlist.c
> +++ b/tools/lib/perf/tests/test-evlist.c
> @@ -1,5 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0
> +#ifndef _GNU_SOURCE
>  #define _GNU_SOURCE // needed for sched.h to get sched_[gs]etaffinity and CPU_(ZERO,SET)
> +#endif
>  #include <sched.h>
>  #include <stdio.h>
>  #include <stdarg.h>
> -- 
> 2.25.1.481.gfbce0eb801-goog
> 

-- 

- Arnaldo