linux-kernel - Re: [PATCH 2/2] perf parse-events: enable more flex/yacc warnings

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Date:   Wed, 10 Jun 2020 11:18:17 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
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>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/2] perf parse-events: enable more flex/yacc warnings

Em Wed, Jun 10, 2020 at 11:09:56AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Jun 10, 2020 at 11:05:26AM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Tue, Jun 09, 2020 at 04:43:44PM -0700, Ian Rogers escreveu:
> > > All C compiler warnings are disabled are disabled by -w. This change
> > > removes the -w from flex and bison targets. To avoid implicit
> > > declarations header files are declared as targets and included.
> 
> > > Tested with GCC 9.3.0 and clang 9.0.1.
> 
> > > Signed-off-by: Ian Rogers <irogers@...gle.com>
> 
> > > +++ b/tools/perf/util/Build
> <SNIP>
> > > -$(OUTPUT)util/parse-events-flex.c: util/parse-events.l $(OUTPUT)util/parse-events-bison.c
> > > +$(OUTPUT)util/parse-events-flex.c $(OUTPUT)util/parse-events-flex.h: util/parse-events.l $(OUTPUT)util/parse-events-bison.c
> > >  	$(call rule_mkdir)
> > > -	$(Q)$(call echo-cmd,flex)$(FLEX) -o $@ --header-file=$(OUTPUT)util/parse-events-flex.h $(PARSER_DEBUG_FLEX) util/parse-events.l
> > > +	$(Q)$(call echo-cmd,flex)$(FLEX) -o $(OUTPUT)util/parse-events-flex.c \
> > > +		--header-file=$(OUTPUT)util/parse-events-flex.h \
> > > +		$(PARSER_DEBUG_FLEX) $<
> 
> <SNIP>
>  
> > And you took advantage of util/parse-events.l being
> > the first dependency to replace it with $<
> 
> <SNIP>
>  
> > Damn, Makefiles are obtuse, we better do this more piecemeal, for
> > instance, using $< where applicable first, etc.
> 
> I mean, first this, ok? Then you do the other bits, and please try to
> keep the positioning as far as possible, so that visually we see what is
> being replaced by what.

Argh, replace all %< below with, of course, $<

- Arnaldo
> 
> diff --git a/tools/perf/util/Build b/tools/perf/util/Build
> index 8d18380ecd10..cc50fdfd0c2f 100644
> --- a/tools/perf/util/Build
> +++ b/tools/perf/util/Build
> @@ -193,27 +193,27 @@ CFLAGS_genelf_debug.o  += -Wno-packed
>  
>  $(OUTPUT)util/parse-events-flex.c: util/parse-events.l $(OUTPUT)util/parse-events-bison.c
>  	$(call rule_mkdir)
> -	$(Q)$(call echo-cmd,flex)$(FLEX) -o $@ --header-file=$(OUTPUT)util/parse-events-flex.h $(PARSER_DEBUG_FLEX) util/parse-events.l
> +	$(Q)$(call echo-cmd,flex)$(FLEX) -o $@ --header-file=$(OUTPUT)util/parse-events-flex.h $(PARSER_DEBUG_FLEX) %<
>  
>  $(OUTPUT)util/parse-events-bison.c: util/parse-events.y
>  	$(call rule_mkdir)
> -	$(Q)$(call echo-cmd,bison)$(BISON) -v util/parse-events.y -d $(PARSER_DEBUG_BISON) -o $@ -p parse_events_
> +	$(Q)$(call echo-cmd,bison)$(BISON) -v %< -d $(PARSER_DEBUG_BISON) -o $@ -p parse_events_
>  
>  $(OUTPUT)util/expr-flex.c: util/expr.l $(OUTPUT)util/expr-bison.c
>  	$(call rule_mkdir)
> -	$(Q)$(call echo-cmd,flex)$(FLEX) -o $@ --header-file=$(OUTPUT)util/expr-flex.h $(PARSER_DEBUG_FLEX) util/expr.l
> +	$(Q)$(call echo-cmd,flex)$(FLEX) -o $@ --header-file=$(OUTPUT)util/expr-flex.h $(PARSER_DEBUG_FLEX) %<
>  
>  $(OUTPUT)util/expr-bison.c: util/expr.y
>  	$(call rule_mkdir)
> -	$(Q)$(call echo-cmd,bison)$(BISON) -v util/expr.y -d $(PARSER_DEBUG_BISON) -o $@ -p expr_
> +	$(Q)$(call echo-cmd,bison)$(BISON) -v %< -d $(PARSER_DEBUG_BISON) -o $@ -p expr_
>  
>  $(OUTPUT)util/pmu-flex.c: util/pmu.l $(OUTPUT)util/pmu-bison.c
>  	$(call rule_mkdir)
> -	$(Q)$(call echo-cmd,flex)$(FLEX) -o $@ --header-file=$(OUTPUT)util/pmu-flex.h util/pmu.l
> +	$(Q)$(call echo-cmd,flex)$(FLEX) -o $@ --header-file=$(OUTPUT)util/pmu-flex.h %<
>  
>  $(OUTPUT)util/pmu-bison.c: util/pmu.y
>  	$(call rule_mkdir)
> -	$(Q)$(call echo-cmd,bison)$(BISON) -v util/pmu.y -d -o $@ -p perf_pmu_
> +	$(Q)$(call echo-cmd,bison)$(BISON) -v %< -d -o $@ -p perf_pmu_
>  
>  CFLAGS_parse-events-flex.o  += -w
>  CFLAGS_pmu-flex.o           += -w

-- 

- Arnaldo