From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ian Rogers <irogers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
Andi Kleen <ak@linux.intel.com>,
Jin Yao <yao.jin@linux.intel.com>,
John Garry <john.garry@huawei.com>,
Adrian Hunter <adrian.hunter@intel.com>,
linux-kernel@vger.kernel.org,
Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 2/2] perf parse-events: enable more flex/yacc warnings
Date: Wed, 10 Jun 2020 11:05:26 -0300 [thread overview]
Message-ID: <20200610140526.GK24868@kernel.org> (raw)
In-Reply-To: <20200609234344.3795-2-irogers@google.com>
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@google.com>
> ---
> tools/perf/util/Build | 55 ++++++++++++++++++++++------------
> tools/perf/util/expr.y | 2 ++
> tools/perf/util/parse-events.y | 1 +
> 3 files changed, 39 insertions(+), 19 deletions(-)
>
> diff --git a/tools/perf/util/Build b/tools/perf/util/Build
> index 8d18380ecd10..8d47dd3ecf2e 100644
> --- a/tools/perf/util/Build
> +++ b/tools/perf/util/Build
> @@ -191,36 +191,53 @@ CFLAGS_llvm-utils.o += -DPERF_INCLUDE_DIR="BUILD_STR($(perf_include_dir_SQ))"
> # avoid compiler warnings in 32-bit mode
> CFLAGS_genelf_debug.o += -Wno-packed
>
> -$(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) $<
Wouldn't this be equivalent to:
+ $(Q)$(call echo-cmd,flex)$(FLEX) -o $(OUTPUT)util/parse-events-flex.c --header-file=$(OUTPUT)util/parse-events-flex.h $(PARSER_DEBUG_FLEX) $< \
+ --header-file=$(OUTPUT)util/parse-events-flex.h
So that we match what is being replaced more easily?
You have to replace $@ by (OUTPUT)util/parse-events-flex.c because now
you're multi-target, but then as $@ is replaced by whichever of those
targets caused the recipe to run, and what is in other places is
$(OUTPUT)util/parse-events-flex.c, we can continue to use $@, no?
And you took advantage of util/parse-events.l being
the first dependency to replace it with $<
So I think you can have it as:
$(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) $< \
--header-file=$(OUTPUT)util/parse-events-flex.h
Right?
You have $(OUTPUT)util/parse-events-flex.h later on as a dependency, but
by then this has resolved already and that recipe won't be called for
it?
Damn, Makefiles are obtuse, we better do this more piecemeal, for
instance, using $< where applicable first, etc.
This will help us bisect problems here,
Thanks,
- Arnaldo
> -$(OUTPUT)util/parse-events-bison.c: util/parse-events.y
> +$(OUTPUT)util/parse-events-bison.c $(OUTPUT)util/parse-events-bison.h: 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 util/parse-events.y \
> + $(PARSER_DEBUG_BISON) -o $(OUTPUT)util/parse-events-bison.c \
> + --defines=$(OUTPUT)util/parse-events-bison.h \
> + -p parse_events_
>
> -$(OUTPUT)util/expr-flex.c: util/expr.l $(OUTPUT)util/expr-bison.c
> +$(OUTPUT)util/parse-events-bison.o: $(OUTPUT)util/parse-events-flex.h
> +
> +$(OUTPUT)util/expr-flex.c $(OUTPUT)util/expr-flex.h: 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 $(OUTPUT)util/expr-flex.c \
> + --header-file=$(OUTPUT)util/expr-flex.h $(PARSER_DEBUG_FLEX) $<
>
> -$(OUTPUT)util/expr-bison.c: util/expr.y
> +$(OUTPUT)util/expr-bison.c $(OUTPUT)util/expr-bison.h: 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 util/expr.y $(PARSER_DEBUG_BISON) \
> + -o $(OUTPUT)util/expr-bison.c \
> + --defines=$(OUTPUT)util/expr-bison.h -p expr_
> +
> +$(OUTPUT)util/expr-bison.o: $(OUTPUT)util/expr-flex.h
>
> -$(OUTPUT)util/pmu-flex.c: util/pmu.l $(OUTPUT)util/pmu-bison.c
> +$(OUTPUT)util/pmu-flex.c $(OUTPUT)util/pmu-flex.h: 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 $(OUTPUT)util/pmu-flex.c \
> + --header-file=$(OUTPUT)util/pmu-flex.h $(PARSER_DEBUG_FLEX) $<
>
> -$(OUTPUT)util/pmu-bison.c: util/pmu.y
> +$(OUTPUT)util/pmu-bison.c $(OUTPUT)util/pmu-bison.h: util/pmu.y
> $(call rule_mkdir)
> - $(Q)$(call echo-cmd,bison)$(BISON) -v util/pmu.y -d -o $@ -p perf_pmu_
> -
> -CFLAGS_parse-events-flex.o += -w
> -CFLAGS_pmu-flex.o += -w
> -CFLAGS_expr-flex.o += -w
> -CFLAGS_parse-events-bison.o += -DYYENABLE_NLS=0 -w
> -CFLAGS_pmu-bison.o += -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -w
> -CFLAGS_expr-bison.o += -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -w
> + $(Q)$(call echo-cmd,bison)$(BISON) -v util/pmu.y $(PARSER_DEBUG_BISON) \
> + -o $(OUTPUT)util/pmu-bison.c \
> + --defines=$(OUTPUT)util/pmu-bison.h -p perf_pmu_
> +
> +flex_flags := -Wno-switch-enum -Wno-switch-default -Wno-unused-function -Wno-redundant-decls
> +bison_flags := -Wno-unused-parameter -Wno-nested-externs
> +CFLAGS_parse-events-flex.o += $(flex_flags)
> +CFLAGS_pmu-flex.o += $(flex_flags)
> +CFLAGS_expr-flex.o += $(flex_flags)
> +CFLAGS_parse-events-bison.o += -DYYENABLE_NLS=0 $(bison_flags)
> +CFLAGS_pmu-bison.o += -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 $(bison_flags)
> +CFLAGS_expr-bison.o += -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 $(bison_flags)
>
> $(OUTPUT)util/parse-events.o: $(OUTPUT)util/parse-events-flex.c $(OUTPUT)util/parse-events-bison.c
> $(OUTPUT)util/pmu.o: $(OUTPUT)util/pmu-flex.c $(OUTPUT)util/pmu-bison.c
> diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
> index bf3e898e3055..f34a5e544a41 100644
> --- a/tools/perf/util/expr.y
> +++ b/tools/perf/util/expr.y
> @@ -39,6 +39,8 @@
> %type <num> expr if_expr
>
> %{
> +#include "expr-flex.h"
> +
> static void expr_error(double *final_val __maybe_unused,
> struct expr_parse_ctx *ctx __maybe_unused,
> void *scanner,
> diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
> index acef87d9af58..ae0aa47dbafb 100644
> --- a/tools/perf/util/parse-events.y
> +++ b/tools/perf/util/parse-events.y
> @@ -17,6 +17,7 @@
> #include "evsel.h"
> #include "parse-events.h"
> #include "parse-events-bison.h"
> +#include "parse-events-flex.h"
>
> void parse_events_error(YYLTYPE *loc, void *parse_state, void *scanner, char const *msg);
>
> --
> 2.27.0.278.ge193c7cf3a9-goog
>
--
- Arnaldo
next prev parent reply other threads:[~2020-06-10 14:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-09 23:43 [PATCH 1/2] perf pmu: remove unused declaration Ian Rogers
2020-06-09 23:43 ` [PATCH 2/2] perf parse-events: enable more flex/yacc warnings Ian Rogers
2020-06-10 14:05 ` Arnaldo Carvalho de Melo [this message]
2020-06-10 14:09 ` Arnaldo Carvalho de Melo
2020-06-10 14:18 ` Arnaldo Carvalho de Melo
2020-06-10 17:00 ` Ian Rogers
2020-06-10 13:46 ` [PATCH 1/2] perf pmu: remove unused declaration Arnaldo Carvalho de Melo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200610140526.GK24868@kernel.org \
--to=acme@kernel.org \
--cc=adrian.hunter@intel.com \
--cc=ak@linux.intel.com \
--cc=alexander.shishkin@linux.intel.com \
--cc=eranian@google.com \
--cc=irogers@google.com \
--cc=john.garry@huawei.com \
--cc=jolsa@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mingo@redhat.com \
--cc=namhyung@kernel.org \
--cc=peterz@infradead.org \
--cc=yao.jin@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.