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

From: John Garry
Date: Thu Oct 21 2021 - 05:22:11 EST


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@xxxxxxxxxx>
---
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