[tip:perf/core] perf tools: Correct Makefile.include

[tip-bot for Borislav Petkov <tipbot@zytor.com>]

Commit-ID:  9e4a66482e9a96405eb9ee7f7bf28c9799ca8670
Gitweb:     http://git.kernel.org/tip/9e4a66482e9a96405eb9ee7f7bf28c9799ca8670
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 20 Feb 2013 16:32:29 +0100
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 15 Mar 2013 13:05:59 -0300

perf tools: Correct Makefile.include

It looks at O= and adjusts the $(OUTPUT) variable based on what the
output directory will be. However, when O is defined but empty, it
wrongly becomes the user's $HOME dir which is not what we want. So check
it is not empty before working with it further.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1361374353-30385-4-git-send-email-bp@alien8.de
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/scripts/Makefile.include | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/scripts/Makefile.include b/tools/scripts/Makefile.include
index 00a05f4..f03e681 100644
--- a/tools/scripts/Makefile.include
+++ b/tools/scripts/Makefile.include
@@ -1,3 +1,4 @@
+ifneq ($(O),)
 ifeq ($(origin O), command line)
 	dummy := $(if $(shell test -d $(O) || echo $(O)),$(error O=$(O) does not exist),)
 	ABSOLUTE_O := $(shell cd $(O) ; pwd)
@@ -7,9 +8,10 @@ ifeq ($(objtree),)
 	objtree := $(O)
 endif
 endif
+endif
 
-ifneq ($(OUTPUT),)
 # check that the output directory actually exists
+ifneq ($(OUTPUT),)
 OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
 $(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
 endif