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

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Message-ID: <5665602A.7020600@huawei.com>
Date:	Mon, 7 Dec 2015 18:32:10 +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 18:29, 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'))
+
  # 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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