linux-kernel - [PATCH v2 07/10] perf parse-events: Disable a subset of flex warnings

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Message-Id: <20200619043356.90024-8-irogers@google.com>
Date:   Thu, 18 Jun 2020 21:33:53 -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 v2 07/10] perf parse-events: Disable a subset of flex warnings

Rather than disable all warnings with -w, disable specific warnings.
Predicate enabling the warnings on more recent flex versions.
Tested with GCC 9.3.0 and clang 9.0.1.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/Build | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 504a6bb991ba..53383bd6f4e2 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -221,9 +221,15 @@ $(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_GE_264 := $(shell expr $(shell $(FLEX) --version | sed -e  's/flex \([0-9]\+\).\([0-9]\+\).\([0-9]\+\)/\1\2\3/g') \>\= 264)
+ifeq ($(FLEX_GE_264),1)
+  flex_flags := -Wno-switch-enum -Wno-switch-default -Wno-unused-function -Wno-redundant-decls
+else
+  flex_flags := -w
+endif
+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
-- 
2.27.0.111.gc72c7da667-goog