linux-kernel - [tip:perf/core] perf tools: Warn the user about how to enable libunwind support

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Date:	Thu, 27 Feb 2014 05:28:34 -0800
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, paulus@...ba.org,
	acme@...hat.com, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, efault@....de, namhyung@...nel.org,
	jolsa@...hat.com, fweisbec@...il.com, adrian.hunter@...el.com,
	dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] perf tools:
  Warn the user about how to enable libunwind support

Commit-ID:  7a0447d61d2d754988add992be2b46d4587ae86a
Gitweb:     http://git.kernel.org/tip/7a0447d61d2d754988add992be2b46d4587ae86a
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Thu, 20 Feb 2014 16:08:18 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 24 Feb 2014 09:29:36 -0300

perf tools: Warn the user about how to enable libunwind support

When one has libunwind installed somewhere the perf tools build process
doesn't expects it to be, this happens:

  [acme@...andy linux]$ make O=/tmp/build/perf -C tools/perf/ install-bin
  make: Entering directory `/home/acme/git/linux/tools/perf'
    BUILD:   Doing 'make -j8' parallel build
  config/Makefile:312: No libunwind found, disabling post unwind support.  Please install libunwind-dev[el] >= 1.1

  Auto-detecting system features:
  <SNIP>
  ...                     libunwind: [ OFF ]

Change the message so that it tells how to use a non-standard libunwind
install directory:

  config/Makefile:312: No libunwind found, disabling post unwind support.  Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR

  [acme@...andy linux]$ make LIBUNWIND_DIR=/opt/libunwind-git/ O=/tmp/build/perf -C tools/perf/ install-bin
  make: Entering directory `/home/acme/git/linux/tools/perf'
    BUILD:   Doing 'make -j8' parallel build

  Auto-detecting system features:
  <SNIP>
  ...                     libunwind: [ on  ]

Acked-by: Jiri Olsa <jolsa@...hat.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mike Galbraith <efault@....de>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-huoxnou7sw85lm58k3pi1xhw@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/config/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 97a64c4..9429805 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -309,7 +309,7 @@ endif # NO_LIBELF
 
 ifndef NO_LIBUNWIND
   ifneq ($(feature-libunwind), 1)
-    msg := $(warning No libunwind found, disabling post unwind support. Please install libunwind-dev[el] >= 1.1);
+    msg := $(warning No libunwind found, disabling post unwind support. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR);
     NO_LIBUNWIND := 1
   else
     ifeq ($(ARCH),arm)
--
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