linux-kernel - [tip:perf/urgent] perf tools: check if -DFORTIFY

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Message-ID: <tip-d2f32479e5526a1ab3b4e43910fcb279871524ce@git.kernel.org>
Date:	Mon, 18 Mar 2013 03:52:33 -0700
From:	tip-bot for Marcin Slusarz <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	mingo@...hat.com, hpa@...or.com, mingo@...nel.org,
	a.p.zijlstra@...llo.nl, marcin.slusarz@...il.com,
	tglx@...utronix.de
Subject: [tip:perf/urgent] perf tools: check if -DFORTIFY_SOURCE=
 2 is allowed

Commit-ID:  d2f32479e5526a1ab3b4e43910fcb279871524ce
Gitweb:     http://git.kernel.org/tip/d2f32479e5526a1ab3b4e43910fcb279871524ce
Author:     Marcin Slusarz <marcin.slusarz@...il.com>
AuthorDate: Sun, 17 Feb 2013 16:03:36 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 13 Mar 2013 16:57:27 -0300

perf tools: check if -DFORTIFY_SOURCE=2 is allowed

It seems gcc (4.7.2) defines _FORTIFY_SOURCE internally and becomes
confused when it sees another definition in flags.

For me, build failed like this:

CHK glibc
Makefile:548: *** No gnu/libc-version.h found, please install glibc-dev[el]/glibc-static. Stop.

and only with V=1 it printed:

<command-line>:0:0: error: "_FORTIFY_SOURCE" redefined [-Werror]
<stdin>:1:0: note: this is the location of the previous definition

Signed-off-by: Marcin Slusarz <marcin.slusarz@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1361113416-8662-1-git-send-email-marcin.slusarz@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/Makefile | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index a2108ca..bb74c79 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -95,7 +95,7 @@ ifeq ("$(origin DEBUG)", "command line")
   PERF_DEBUG = $(DEBUG)
 endif
 ifndef PERF_DEBUG
-  CFLAGS_OPTIMIZE = -O6 -D_FORTIFY_SOURCE=2
+  CFLAGS_OPTIMIZE = -O6
 endif
 
 ifdef PARSER_DEBUG
@@ -180,6 +180,12 @@ ifeq ($(call try-cc,$(SOURCE_HELLO),$(CFLAGS) -Werror -Wvolatile-register-var,-W
        CFLAGS := $(CFLAGS) -Wvolatile-register-var
 endif
 
+ifndef PERF_DEBUG
+	ifeq ($(call try-cc,$(SOURCE_HELLO),$(CFLAGS) -D_FORTIFY_SOURCE=2,-D_FORTIFY_SOURCE=2),y)
+		CFLAGS := $(CFLAGS) -D_FORTIFY_SOURCE=2
+	endif
+endif
+
 ### --- END CONFIGURATION SECTION ---
 
 ifeq ($(srctree),)
--
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