linux-kernel - Re: [PATCH 1/2] tools build: Introduce features dump include makefile

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Date:	Mon, 7 Dec 2015 17:22:41 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 1/2] tools build: Introduce features dump include makefile

Sorry for the late response...

Tested-by: Wang Nan <wangnan0@...wei.com>

But I'm thinking whether we can remove FEATURE-DUMP and rely on
FEATURE-INCLUDE only, since they contain same information...

Thank you.

On 2015/12/7 16:56, Jiri Olsa wrote:
> ping, Wang Nan, any comments on these 2?
>
> thanks,
> jirka
>
> On Fri, Nov 27, 2015 at 10:06:50AM +0100, Jiri Olsa wrote:
>> Creating the FEATURE-INCLUDE file, that contains all features
>> status dumped in make's variable format:
>>     ...
>>     feature-backtrace=1
>>     feature-dwarf=1
>>     ...
>>
>> It's purpose is to be included in sub-project makefiles to get
>> features detection state. This way we can run the detection only
>> in top level project and propagate it down.
>>
>> Cc: Wang Nan <wangnan0@...wei.com>
>> Link: http://lkml.kernel.org/n/tip-fcq5rtdhcu4300sjp2p8l936@git.kernel.org
>> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
>> ---
>>   tools/build/Makefile.feature | 12 ++++++++++++
>>   tools/lib/bpf/.gitignore     |  1 +
>>   tools/lib/bpf/Makefile       |  2 +-
>>   tools/perf/.gitignore        |  1 +
>>   tools/perf/Makefile.perf     |  2 +-
>>   5 files changed, 16 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
>> index 37ff4c9f92f1..51f8d5928f98 100644
>> --- a/tools/build/Makefile.feature
>> +++ b/tools/build/Makefile.feature
>> @@ -131,6 +131,16 @@ ifeq ($(dwarf-post-unwind),1)
>>     FEATURE_DUMP += dwarf-post-unwind($(dwarf-post-unwind-text))
>>   endif
>>   
>> +# The FEATURE-INCLUDE file contains all features status
>> +# dumped in make's variable format:
>> +#   ...
>> +#   feature-backtrace=1
>> +#   feature-dwarf=1
>> +#   ...
>> +# It's to be included in sub-project makefiles to get
>> +# features detection state.
>> +FEATURE_INCLUDE_FILENAME = $(OUTPUT)FEATURE-INCLUDE$(FEATURE_USER)
>> +
>>   # The $(feature_display) controls the default detection message
>>   # output. It's set if:
>>   # - detected features differes from stored features from
>> @@ -140,6 +150,8 @@ endif
>>   
>>   ifneq ("$(FEATURE_DUMP)","$(FEATURE_DUMP_FILE)")
>>     $(shell echo "$(FEATURE_DUMP)" > $(FEATURE_DUMP_FILENAME))
>> +  $(shell rm -f $(FEATURE_INCLUDE_FILENAME))
>> +  $(foreach feat,$(FEATURE_TESTS),$(shell echo "feature-$(feat)=$(feature-$(feat))" >> $(FEATURE_INCLUDE_FILENAME)))
>>     feature_display := 1
>>   endif
>>   
>> diff --git a/tools/lib/bpf/.gitignore b/tools/lib/bpf/.gitignore
>> index f81e549ddfdb..4019b8e4021a 100644
>> --- a/tools/lib/bpf/.gitignore
>> +++ b/tools/lib/bpf/.gitignore
>> @@ -1,2 +1,3 @@
>>   libbpf_version.h
>>   FEATURE-DUMP.libbpf
>> +FEATURE-INCLUDE.libbpf
>> diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
>> index 636e3ddb93a1..6916cbe962a5 100644
>> --- a/tools/lib/bpf/Makefile
>> +++ b/tools/lib/bpf/Makefile
>> @@ -190,7 +190,7 @@ config-clean:
>>   clean:
>>   	$(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d \
>>   		$(RM) LIBBPF-CFLAGS
>> -	$(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
>> +	$(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf $(OUTPUT)FEATURE-INCLUDE.libbpf
>>   
>>   
>>   
>> diff --git a/tools/perf/.gitignore b/tools/perf/.gitignore
>> index 3d1bb802dbf4..4a3eb8dedc54 100644
>> --- a/tools/perf/.gitignore
>> +++ b/tools/perf/.gitignore
>> @@ -2,6 +2,7 @@ PERF-CFLAGS
>>   PERF-GUI-VARS
>>   PERF-VERSION-FILE
>>   FEATURE-DUMP
>> +FEATURE-INCLUDE
>>   perf
>>   perf-read-vdso32
>>   perf-read-vdsox32
>> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
>> index 929a32ba15f5..b74f924185b7 100644
>> --- a/tools/perf/Makefile.perf
>> +++ b/tools/perf/Makefile.perf
>> @@ -589,7 +589,7 @@ clean: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean $(LIBBPF)-clean config-clean
>>   	$(Q)find . -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
>>   	$(Q)$(RM) $(OUTPUT).config-detected
>>   	$(call QUIET_CLEAN, core-progs) $(RM) $(ALL_PROGRAMS) perf perf-read-vdso32 perf-read-vdsox32
>> -	$(call QUIET_CLEAN, core-gen)   $(RM)  *.spec *.pyc *.pyo */*.pyc */*.pyo $(OUTPUT)common-cmds.h TAGS tags cscope* $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)FEATURE-DUMP $(OUTPUT)util/*-bison* $(OUTPUT)util/*-flex* \
>> +	$(call QUIET_CLEAN, core-gen)   $(RM)  *.spec *.pyc *.pyo */*.pyc */*.pyo $(OUTPUT)common-cmds.h TAGS tags cscope* $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)FEATURE-DUMP $(OUTPUT)FEATURE-INCLUDE $(OUTPUT)util/*-bison* $(OUTPUT)util/*-flex* \
>>   		$(OUTPUT)util/intel-pt-decoder/inat-tables.c
>>   	$(QUIET_SUBDIR0)Documentation $(QUIET_SUBDIR1) clean
>>   	$(python-clean)
>> -- 
>> 2.4.3
>>


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