linux-kernel - Re: [PATCH] tools build: Remove FEATURE-DUMP

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Date:	Mon, 7 Dec 2015 14:52:54 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, pi3orama@....com,
	lizefan@...wei.com, Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] tools build: Remove FEATURE-DUMP

On Mon, Dec 07, 2015 at 10:48:58AM +0000, Wang Nan wrote:
> Jiri introduces a FEATURE-INCLUDE file for feature checking. It
> contains same information with FEATURE-DUMP, so we can avoid generating
> FEATURE-DUMP.
> 
> Following modification should ensure FEATURE_TESTS contains
> FEATURE_DISPLAY.
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> ---
> 
> I haven't thoroughly tested this patch, just want to show the
> possibility of removing FEATURE-DUMP. I don't insist on this. Jiri, if
> you find this patch is not good please simply ignore it.
> 
> Thank you.
> 
> ---
> 
>  tools/build/Makefile.feature | 8 +++-----
>  tools/lib/bpf/.gitignore     | 1 -
>  tools/lib/bpf/Makefile       | 2 +-
>  tools/perf/.gitignore        | 1 -
>  tools/perf/Makefile.perf     | 2 +-
>  5 files changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
> index 51f8d59..98a13bd 100644
> --- a/tools/build/Makefile.feature
> +++ b/tools/build/Makefile.feature
> @@ -123,10 +123,6 @@ 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 $(FEATURE_DUMP_FILENAME))
> -
>  ifeq ($(dwarf-post-unwind),1)
>    FEATURE_DUMP += dwarf-post-unwind($(dwarf-post-unwind-text))
>  endif
> @@ -141,6 +137,9 @@ 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)='))

hum, this ignores dwarf-post-unwind setup, I think it needs more changes
I'll post new version

thanks.
jirka
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