linux-kernel - Re: [PATCH 1/3] tools build: Introduce features dump include makefile

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Message-ID: <20151126162326.GG2945@kernel.org>
Date:	Thu, 26 Nov 2015 13:23:26 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	Wang Nan <wangnan0@...wei.com>,
	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 1/3] tools build: Introduce features dump include makefile

Em Thu, Nov 26, 2015 at 02:54:02PM +0100, Jiri Olsa escreveu:
> 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.

See, you can do it, nice explanation! :-)

- Arnaldo
 
> 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/perf/.gitignore        |  1 +
>  tools/perf/Makefile.perf     |  2 +-
>  3 files changed, 14 insertions(+), 1 deletion(-)
> 
> 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/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 0d19d5447d6c..97badfa2a195 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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