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

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Date:	Mon, 7 Dec 2015 18:38:50 +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



On 2015/12/7 18:32, Wangnan (F) wrote:
>
>
> On 2015/12/7 18:29, Jiri Olsa wrote:
>> On Mon, Dec 07, 2015 at 05:22:41PM +0800, Wangnan (F) wrote:
>>> 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...
>> had the same thought, but the issue I hit is that I couldn't
>> find a way to create *multiline* contents for FEATURE-INCLUDE
>> variable in make
>>
>> maybe we could use internally signle line contents and
>> convert multiline contents of FEATURE-INCLUDE into singleline
>> variable for checking against live info
>
> What about this? The drawback is it heavily rely on shell commands...
>
> diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
> index 51f8d59..514c4e6 100644
> --- a/tools/build/Makefile.feature
> +++ b/tools/build/Makefile.feature
> @@ -123,9 +123,8 @@ define feature_print_text_code
>      MSG = $(shell printf '...%30s: %s' $(1) $(2))
>  endef
>
> -FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
> -FEATURE_DUMP := $(foreach 
> feat,$(FEATURE_DISPLAY),feature-$(feat)($(feature-$(feat))))
> -FEATURE_DUMP_FILE := $(shell touch $(FEATURE_DUMP_FILENAME); cat 
> $(FEATURE_DUMP_FILENAME))
> +#FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
> +#FEATURE_DUMP_FILE := $(shell touch $(FEATURE_DUMP_FILENAME); cat 
> $(FEATURE_DUMP_FILENAME))
>
>  ifeq ($(dwarf-post-unwind),1)
>    FEATURE_DUMP += dwarf-post-unwind($(dwarf-post-unwind-text))
> @@ -141,6 +140,9 @@ endif
>  # features detection state.
>  FEATURE_INCLUDE_FILENAME = $(OUTPUT)FEATURE-INCLUDE$(FEATURE_USER)
>
> +FEATURE_DUMP := $(foreach 
> feat,$(FEATURE_DISPLAY),feature-$(feat)($(feature-$(feat))))
> +FEATURE_DUMP_FILE := $(foreach feat,$(FEATURE_DISPLAY),$(shell touch 
> $(FEATURE_INCLUDE_FILENAME); cat $(FEATURE_INCLUDE_FILENAME) | grep 
> 'feature-$(feat)=' | sed 's/=\(.\)/(\1)/g'))

We can avoid this 'sed' by transforming feature-xxx(1) to feature-xxx=1, 
then it would be uniformed
with strings in FEATURE-INCLUDE...

Will provide a patch with my SOB.

Thank you.

> +
>  # The $(feature_display) controls the default detection message
>  # output. It's set if:
>  # - detected features differes from stored features from
>
>> jirka
>


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