[PATCH 1/3] tools build: Introduce features dump include makefile

[Jiri Olsa]

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.

Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-fcq5rtdhcu4300sjp2p8l936@xxxxxxxxxxxxxx
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
 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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