linux-kernel - [tip:perf/core] tools/perf/build: Exclude MAKEFLAGS from nested invocation

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Message-ID: <tip-684f434cc05a122938b75e055d7d799f1dd58d55@git.kernel.org>
Date:	Mon, 14 Oct 2013 22:19:32 -0700
From:	tip-bot for Ingo Molnar <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
	mingo@...nel.org, a.p.zijlstra@...llo.nl, namhyung@...nel.org,
	jolsa@...hat.com, dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] tools/perf/build:
  Exclude MAKEFLAGS from nested invocation

Commit-ID:  684f434cc05a122938b75e055d7d799f1dd58d55
Gitweb:     http://git.kernel.org/tip/684f434cc05a122938b75e055d7d799f1dd58d55
Author:     Ingo Molnar <mingo@...nel.org>
AuthorDate: Fri, 4 Oct 2013 11:11:32 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 9 Oct 2013 08:49:01 +0200

tools/perf/build: Exclude MAKEFLAGS from nested invocation

In case the user specifies MAKEFLAGS as an environment variable,
or uses 'make -jN' explicitly, the options can conflict and result in:

    BUILD: Doing 'make -j8' parallel build
    make[1]: warning: -jN forced in submake: disabling jobserver mode.
    GEN common-cmds.h
    make[1]: *** write jobserver: Bad file descriptor.  Stop.

Make sure we invoke the main makefile in a pristine state.

Users who want to do something non-standard can use the:

  make -f Makefile.perf

method to invoke the makefile.

Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/n/tip-uen6hzTvkqqngqwjma9yoEgw@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 tools/perf/Makefile | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 6f6f13a..74f52d8 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -1,3 +1,10 @@
+#
+# This is a simple wrapper Makefile that calls the main Makefile.perf
+# with a -j option to do parallel builds
+#
+# If you want to invoke the perf build in some non-standard way then
+# you can use the 'make -f Makefile.perf' method to invoke it.
+#
 
 #
 # Clear out the built-in rules GNU make defines by default (such as .o targets),
@@ -6,6 +13,11 @@
 .SUFFIXES:
 
 #
+# We don't want to pass along options like -j:
+#
+unexport MAKEFLAGS
+
+#
 # Do a parallel build with multiple jobs, based on the number of CPUs online
 # in this system: 'make -j8' on a 8-CPU system, etc.
 #
@@ -18,14 +30,12 @@ ifeq ($(JOBS),)
   endif
 endif
 
-export JOBS
-
 define print_msg
   @printf '    BUILD: Doing '\''make \033[33m-j'$(JOBS)'\033[m'\'' parallel build\n'
 endef
 
 define make
-  @$(MAKE) -f Makefile.perf --no-print-directory -j$(JOBS) $@
+  @$(MAKE) -f Makefile.perf --no-print-directory -j$(JOBS) O=$(O) $@
 endef
 
 #
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