[tip:perf/core] tools build: Add detected config support

[tip-bot for Jiri Olsa]

Commit-ID:  fcfd6611fbccdbf2593bd949097a5c0e45cd96da
Gitweb:     http://git.kernel.org/tip/fcfd6611fbccdbf2593bd949097a5c0e45cd96da
Author:     Jiri Olsa <jolsa@xxxxxxxxxx>
AuthorDate: Wed, 31 Dec 2014 17:37:00 +0100
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 12 Feb 2015 11:16:56 -0300

tools build: Add detected config support

Adding support to include detected configuration makefile into the build
process. This will allow the Build objects to be configurable based on
the config data, like:

  perf-$(CONFIG_KRAVA) += krava.o

The configuration is stored in '.config-detected' file, which is
generated for each compilation.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Tested-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
Tested-by: Will Deacon <will.deacon@xxxxxxx>
Cc: Alexis Berlemont <alexis.berlemont@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-bl8qho0ubck7aqrbbfu9inlm@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/build/Makefile.build | 3 +++
 tools/perf/config/Makefile | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/tools/build/Makefile.build b/tools/build/Makefile.build
index ae203f2..35174d9 100644
--- a/tools/build/Makefile.build
+++ b/tools/build/Makefile.build
@@ -22,6 +22,9 @@ build-dir := $(srctree)/tools/build
 # Generic definitions
 include $(build-dir)/Build.include
 
+# do not force detected configuration
+-include .config-detected
+
 # Init all relevant variables used in build files so
 # 1) they have correct type
 # 2) they do not inherit any value from the environment
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index cc22408..ba41421 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -11,6 +11,10 @@ ifneq ($(obj-perf),)
 obj-perf := $(abspath $(obj-perf))/
 endif
 
+$(shell echo -n > .config-detected)
+detected     = $(shell echo "$(1)=y"       >> .config-detected)
+detected_var = $(shell echo "$(1)=$($(1))" >> .config-detected)
+
 LIB_INCLUDE := $(srctree)/tools/lib/
 CFLAGS := $(EXTRA_CFLAGS) $(EXTRA_WARNINGS)
 
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