linux-kernel - [PATCH 4/5] tools build feature: Use value assignment form for FEATURE-DUMP file

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Date:	Wed, 23 Dec 2015 18:58:33 +0100
From:	Jiri Olsa <jolsa@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	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>,
	Wang Nan <wangnan0@...wei.com>, pi3orama <pi3orama@....com>,
	lizefan@...wei.com
Subject: [PATCH 4/5] tools build feature: Use value assignment form for FEATURE-DUMP file

Changing the contents of the FEATURE-DUMP file,
so it looks like:

  feature-backtrace=1
  feature-dwarf=0
  feature-fortify-source=1
  feature-sync-compare-and-swap=0

This way it could get included in sub projects,
so they won't be forced to redo features detection.

Also now storing the complete set of features.

Link: http://lkml.kernel.org/n/tip-69xvy9nvx0gvrvl10q40ri1q@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/build/Makefile.feature | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index bd6eff14c8f9..7796313e5ab8 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -129,8 +129,24 @@ endef
 feature_ass = feature-$(1)=$(feature-$(1))
 
 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
-FEATURE_DUMP := $(foreach feat,$(FEATURE_DISPLAY),$(call feature_ass,$(feat)))
-FEATURE_DUMP_FILE := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
+FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
+
+feature_dump_check = $(eval $(feature_dump_check_code))
+define feature_dump_check_code
+  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
+    $(2) := 1
+  endif
+endef
+
+#
+# First check if any test from FEATURE_DISPLAY
+# and set feature_display := 1 if it does
+$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_ass,$(feat)),feature_display))
+
+#
+# Now also check if any other test changed,
+# so we force FEATURE-DUMP generation
+$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_ass,$(feat)),feature_dump_changed))
 
 # The $(feature_display) controls the default detection message
 # output. It's set if:
@@ -139,9 +155,9 @@ FEATURE_DUMP_FILE := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_
 # - one of the $(FEATURE_DISPLAY) is not detected
 # - VF is enabled
 
-ifneq ("$(FEATURE_DUMP)","$(FEATURE_DUMP_FILE)")
-  $(shell echo "$(FEATURE_DUMP)" > $(FEATURE_DUMP_FILENAME))
-  feature_display := 1
+ifeq ($(feature_dump_changed),1)
+  $(shell rm -f $(FEATURE_DUMP_FILENAME))
+  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_ass,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
 endif
 
 feature_display_check = $(eval $(feature_check_display_code))
-- 
2.4.3

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