linux-kernel - [tip:perf/core] tools build: Fix Makefile(s) to properly invoke tools build

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Date:	Tue, 5 May 2015 19:56:27 -0700
From:	tip-bot for Jiri Olsa <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	dsahern@...il.com, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	bp@...e.de, computersforpeace@...il.com,
	linux-kernel@...r.kernel.org, namhyung@...nel.org,
	paulus@...ba.org, jolsa@...nel.org, hpa@...or.com, mmarek@...e.cz,
	sam@...nborg.org, mingo@...nel.org, acme@...hat.com,
	dhowells@...hat.com
Subject: [tip:perf/core] tools build: Fix Makefile(s)
  to properly invoke tools build

Commit-ID:  16671c1e1cac2dbb995feb4bc55082fd939b5c2c
Gitweb:     http://git.kernel.org/tip/16671c1e1cac2dbb995feb4bc55082fd939b5c2c
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Sat, 18 Apr 2015 22:34:39 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 29 Apr 2015 10:37:46 -0300

tools build: Fix Makefile(s) to properly invoke tools build

Several fixes were needed to allow following builds:
  $ make tools/tmon
  $ make -C <kernelsrc> tools/perf
  $ make -C <kernelsrc>/tools perf

 - some of the tools (perf) use same make variables as in
   kernel build, unsetting srctree and objtree
 - using original $(O) for O variable
 - perf build does not follow the descend function setup
   invoking it via it's own make rule

I tried the rest of the tools/Makefile targets and they
seem to work now.

Reported-by: Brian Norris <computersforpeace@...il.com>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Borislav Petkov <bp@...e.de>
Cc: Brian Norris <computersforpeace@...il.com>
Cc: David Ahern <dsahern@...il.com>
Cc: David Howells <dhowells@...hat.com>
Cc: Michal Marek <mmarek@...e.cz>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: linux-kbuild@...r.kernel.org
Link: http://lkml.kernel.org/r/1429389280-18720-3-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 Makefile       |  5 ++---
 tools/Makefile | 12 +++++++++++-
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index da36a3b..b1ca060 100644
--- a/Makefile
+++ b/Makefile
@@ -214,7 +214,6 @@ VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 
 export srctree objtree VPATH
 
-
 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 # first, and if a usermode build is happening, the "ARCH=um" on the command
 # line overrides the setting of ARCH below.  If a native build is happening,
@@ -1504,11 +1503,11 @@ image_name:
 # Clear a bunch of variables before executing the submake
 tools/: FORCE
 	$(Q)mkdir -p $(objtree)/tools
-	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
+	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/
 
 tools/%: FORCE
 	$(Q)mkdir -p $(objtree)/tools
-	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
+	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ $*
 
 # Single targets
 # ---------------------------------------------------------------------------
diff --git a/tools/Makefile b/tools/Makefile
index 01995cc..b351027 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -1,3 +1,8 @@
+# Some of the tools (perf) use same make variables
+# as in kernel build.
+export srctree=
+export objtree=
+
 include scripts/Makefile.include
 
 help:
@@ -50,8 +55,13 @@ liblockdep: FORCE
 libapi: FORCE
 	$(call descend,lib/api)
 
+# The perf build does not follow the descend function setup,
+# invoking it via it's own make rule.
+PERF_O   = $(if $(O),$(O)/tools/perf,)
+
 perf: FORCE
-	$(call descend,$@)
+	$(Q)mkdir -p $(PERF_O) .
+	$(Q)$(MAKE) --no-print-directory -C perf O=$(PERF_O) subdir=
 
 selftests: FORCE
 	$(call descend,testing/$@)
--
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