[tip:perf/core] perf build: Fix single target build dependency check

[tip-bot for Jiri Olsa <tipbot@zytor.com>]

Commit-ID:  8e55735150934f9ab2ce8a8005626e5693a6b61d
Gitweb:     http://git.kernel.org/tip/8e55735150934f9ab2ce8a8005626e5693a6b61d
Author:     Jiri Olsa <jolsa@kernel.org>
AuthorDate: Mon, 22 Jun 2015 14:50:52 +0200
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 22 Jun 2015 11:27:09 -0300

perf build: Fix single target build dependency check

Currently if we build a single target like:

  $ touch util/map.c && make util/map.o

It will not rebuild util/map.o if it already exists and util/map.c is
modified.

The reason is that the top-level 'Makefile' processes util/map.o as an
implicit rule and if util/map.o exists make considers the 'util/map.o'
target as done and will not nest into Makefile.perf.

Adding FORCE for '%', because that's what we want to nest into
Makefile.perf for any target.

Adding Makefile into phony targets, because make tries to rebuild it and
it's also resolved as '%' target.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1434977452-32520-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index d31a7bb..480546d 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -83,8 +83,8 @@ build-test:
 #
 # All other targets get passed through:
 #
-%:
+%: FORCE
 	$(print_msg)
 	$(make)
 
-.PHONY: tags TAGS
+.PHONY: tags TAGS FORCE Makefile