linux-kernel - Re: [PATCH 1/2] perf tools: Fix bison object compilation with clang 15

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Date:   Thu, 29 Sep 2022 11:22:41 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        linux-perf-users <linux-perf-users@...r.kernel.org>
Subject: Re: [PATCH 1/2] perf tools: Fix bison object compilation with clang 15

On Thu, Sep 29, 2022 at 11:01 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> Em Thu, Sep 29, 2022 at 04:05:13PM +0200, Jiri Olsa escreveu:
> > Arnaldo reported compilation fail with clang 15:
> >
> >     CC      util/parse-events-bison.o
> >   util/parse-events-bison.c:1401:9: error: variable 'parse_events_nerrs'
> >   set but not used [-Werror,-Wunused-but-set-variable]
> >       int yynerrs = 0;
> >         ^
> >   util/parse-events-bison.c:72:25: note: expanded from macro 'yynerrs'
> >   #define yynerrs         parse_events_nerrs
> >                         ^
> >   1 error generated.
> >
> > Disabling -Wunused-but-set-variable check for bison object compilation.
>
> So we have to disable something else:
>
>   37    44.92 fedora:32                     : FAIL clang version 10.0.1 (Fedora 10.0.1-3.fc32)
>     error: unknown warning option '-Wno-unused-but-set-variable'; did you mean '-Wno-unused-const-variable'? [-Werror,-Wunknown-warning-option]
>     make[3]: *** [/git/perf-6.0.0-rc7/tools/build/Makefile.build:139: util] Error 2
>   38    61.77 fedora:33                     : FAIL clang version 11.0.0 (Fedora 11.0.0-3.fc33)
>     error: unknown warning option '-Wno-unused-but-set-variable'; did you mean '-Wno-unused-const-variable'? [-Werror,-Wunknown-warning-option]
>     make[3]: *** [/git/perf-6.0.0-rc7/tools/build/Makefile.build:139: util] Error 2
>   39    66.59 fedora:34                     : FAIL clang version 12.0.1 (Fedora 12.0.1-1.fc34)
>     error: unknown warning option '-Wno-unused-but-set-variable'; did you mean '-Wno-unused-const-variable'? [-Werror,-Wunknown-warning-option]
>     make[3]: *** [/git/perf-6.0.0-rc7/tools/build/Makefile.build:139: util] Error 2
>
>
> I'll try yours + -Wno-unknown-warning-option

Is `-Wno-unknown-warning-option` known to older versions? ;-)

Thanks,
Namhyung