linux-kernel - [PATCH v2 2/2] perf jevents: Enable warnings through HOSTCFLAGS

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Date:   Thu, 21 Oct 2021 17:16:45 +0800
From:   John Garry <john.garry@...wei.com>
To:     <peterz@...radead.org>, <acme@...nel.org>, <mark.rutland@....com>,
        <alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
        <namhyung@...nel.org>, <mingo@...hat.com>
CC:     <irogers@...gle.com>, <linux-perf-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kjain@...ux.ibm.com>,
        <james.clark@....com>, John Garry <john.garry@...wei.com>
Subject: [PATCH v2 2/2] perf jevents: Enable warnings through HOSTCFLAGS

Currently no compiler warnings at all are enabled for building jevents,
so help catch bugs at compile time by enabling through HOSTCFLAGS.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 tools/perf/Makefile.config  | 5 +++++
 tools/perf/Makefile.perf    | 2 +-
 tools/perf/pmu-events/Build | 2 +-
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 0ae2e3d8b832..374f65b52157 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -17,6 +17,7 @@ detected     = $(shell echo "$(1)=y"       >> $(OUTPUT).config-detected)
 detected_var = $(shell echo "$(1)=$($(1))" >> $(OUTPUT).config-detected)
 
 CFLAGS := $(EXTRA_CFLAGS) $(filter-out -Wnested-externs,$(EXTRA_WARNINGS))
+HOSTCFLAGS := $(filter-out -Wnested-externs,$(EXTRA_WARNINGS))
 
 include $(srctree)/tools/scripts/Makefile.arch
 
@@ -211,6 +212,7 @@ endif
 ifneq ($(WERROR),0)
   CORE_CFLAGS += -Werror
   CXXFLAGS += -Werror
+  HOSTCFLAGS += -Werror
 endif
 
 ifndef DEBUG
@@ -292,6 +294,9 @@ CXXFLAGS += -ggdb3
 CXXFLAGS += -funwind-tables
 CXXFLAGS += -Wno-strict-aliasing
 
+HOSTCFLAGS += -Wall
+HOSTCFLAGS += -Wextra
+
 # Enforce a non-executable stack, as we may regress (again) in the future by
 # adding assembler files missing the .GNU-stack linker note.
 LDFLAGS += -Wl,-z,noexecstack
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 7df13e74450c..118bcdc70bb4 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -226,7 +226,7 @@ else
 endif
 
 export srctree OUTPUT RM CC CXX LD AR CFLAGS CXXFLAGS V BISON FLEX AWK
-export HOSTCC HOSTLD HOSTAR
+export HOSTCC HOSTLD HOSTAR HOSTCFLAGS
 
 include $(srctree)/tools/build/Makefile.include
 
diff --git a/tools/perf/pmu-events/Build b/tools/perf/pmu-events/Build
index a055dee6a46a..d5c287f069a2 100644
--- a/tools/perf/pmu-events/Build
+++ b/tools/perf/pmu-events/Build
@@ -1,7 +1,7 @@
 hostprogs := jevents
 
 jevents-y	+= json.o jsmn.o jevents.o
-HOSTCFLAGS_jevents.o	= -I$(srctree)/tools/include
+HOSTCFLAGS_jevents.o	= -I$(srctree)/tools/include $(HOSTCFLAGS)
 pmu-events-y	+= pmu-events.o
 JDIR		=  pmu-events/arch/$(SRCARCH)
 JSON		=  $(shell [ -d $(JDIR) ] &&				\
-- 
2.17.1