linux-kernel - [PATCH 07/10] perf parse-events: Disable a subset of flex warnings

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Date:   Wed, 10 Jun 2020 14:50:57 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        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
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH 07/10] perf parse-events: Disable a subset of flex warnings

Rather than disable all warnings with -w, disable specific warnings.
Tested with GCC 9.3.0 and clang 9.0.1.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/Build | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 504a6bb991ba..43f3310827c4 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -221,9 +221,10 @@ $(OUTPUT)util/pmu-bison.c $(OUTPUT)util/pmu-bison.h: util/pmu.y
 	$(Q)$(call echo-cmd,bison)$(BISON) -v $< -d $(PARSER_DEBUG_BISON) \
 		-o $(OUTPUT)util/pmu-bison.c -p perf_pmu_
 
-CFLAGS_parse-events-flex.o  += -w
-CFLAGS_pmu-flex.o           += -w
-CFLAGS_expr-flex.o          += -w
+flex_flags := -Wno-switch-enum -Wno-switch-default -Wno-unused-function -Wno-redundant-decls
+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 -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
-- 
2.27.0.278.ge193c7cf3a9-goog