linux-kernel - Re: [PATCH] perf tools: Fix build failture on perl script context

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Date:	Tue, 2 Aug 2016 10:29:22 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf tools: Fix build failture on perl script context

Em Tue, Aug 02, 2016 at 11:43:17AM +0900, Namhyung Kim escreveu:
> On my Archlinux machine, perf faild to build like below:
> 
>     CC       scripts/perl/Perf-Trace-Util/Context.o
>   In file included from /usr/lib/perl5/core/perl/CORE/perl.h:3905:0,
>                    from Context.xs:23:
>   /usr/lib/perl5/core/perl/CORE/inline.h: In function :
>   /usr/lib/perl5/core/perl/CORE/cop.h:612:13: warning: declaration of 'av'
>                                   shadows a previous local [-Werror-shadow]
>              AV *av =3D GvAV(PL_defgv);
>                  ^
>   /usr/lib/perl5/core/perl/CORE/inline.h:526:5: note: in expansion of
>                                   macro 'CX_POP_SAVEARRAY'
>          CX_POP_SAVEARRAY(cx);
>          ^~~~~~~~~~~~~~~~
>   In file included from /usr/lib/perl5/core/perl/CORE/perl.h:5853:0,
>                    from Context.xs:23:
>   /usr/lib/perl5/core/perl/CORE/inline.h:518:9: note:
>                                   shadowed declaration is here
>          AV *av;
>              ^~

But you forgot to describe _what_ you did to "fix" the problem besides
breaking down a long line, i.e. adding -Wno-shadow, is that what we
want? To ignore such warnings?

Some explanation in the changelog as to why that is the wise solution
would help a lot :-\

- Arnaldo

> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/scripts/perl/Perf-Trace-Util/Build | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/scripts/perl/Perf-Trace-Util/Build b/tools/perf/scripts/perl/Perf-Trace-Util/Build
> index 928e110179cb..34faecf774ae 100644
> --- a/tools/perf/scripts/perl/Perf-Trace-Util/Build
> +++ b/tools/perf/scripts/perl/Perf-Trace-Util/Build
> @@ -1,3 +1,5 @@
>  libperf-y += Context.o
>  
> -CFLAGS_Context.o += $(PERL_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-unused-parameter -Wno-nested-externs -Wno-undef -Wno-switch-default
> +CFLAGS_Context.o += $(PERL_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes
> +CFLAGS_Context.o += -Wno-unused-parameter -Wno-nested-externs -Wno-undef
> +CFLAGS_Context.o += -Wno-switch-default -Wno-shadow
> -- 
> 2.9.2