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

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Date:   Thu, 29 Sep 2022 15:01:48 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/2] perf tools: Fix bison object compilation with clang
 15

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

;-)

- Arnaldo
 
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/util/Build | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/Build b/tools/perf/util/Build
> index 8fd6dc8de521..d559c80559e3 100644
> --- a/tools/perf/util/Build
> +++ b/tools/perf/util/Build
> @@ -270,7 +270,7 @@ CFLAGS_expr-flex.o          += $(flex_flags)
>  bison_flags := -DYYENABLE_NLS=0
>  BISON_GE_35 := $(shell expr $(shell $(BISON) --version | grep bison | sed -e 's/.\+ \([0-9]\+\).\([0-9]\+\)/\1\2/g') \>\= 35)
>  ifeq ($(BISON_GE_35),1)
> -  bison_flags += -Wno-unused-parameter -Wno-nested-externs -Wno-implicit-function-declaration -Wno-switch-enum
> +  bison_flags += -Wno-unused-parameter -Wno-nested-externs -Wno-implicit-function-declaration -Wno-switch-enum -Wno-unused-but-set-variable
>  else
>    bison_flags += -w
>  endif
> -- 
> 2.37.3

-- 

- Arnaldo