Messages in this thread | | | Subject | Re: [PATCH v2 2/2] perf jevents: Enable warnings through HOSTCFLAGS | From | John Garry <> | Date | Fri, 22 Oct 2021 10:42:11 +0100 |
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On 21/10/2021 13:48, Jiri Olsa wrote: >> +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 $(HOSTCFLAGS) > so the the host cflags are made of: > > host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(KBUILD_HOSTCFLAGS) -D"BUILD_STR(s)=\#s" $(HOSTCFLAGS_$(basetarget).o) $(HOSTCFLAGS_$(obj)) >
ok, so IIRC, then the rule for building .o from .c in tools/build/Makefile.build will pick up HOSTCFLAGS through this variable, so we then don't need to explicitly mention it in the per-target rule, so can have this as before in pmu-events/Build
HOSTCFLAGS_jevents.o = -I$(srctree)/tools/include
right?
(Indeed I guess that we can get rid of -I$(srctree)/tools/include as well)
Thanks, John
> can't you use KBUILD_HOSTCFLAGS? > > also perhaps we could rename KBUILD_HOSTCFLAGS to HOSTCFLAGS? > the name seems like leftover from kbuild move > > jirka > >> pmu-events-y += pmu-events.o >> JDIR = pmu-events/arch/$(SRCARCH) >> JSON = $(shell [ -d $(JDIR) ] &&
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