linux-kernel - [PATCH v2] tools/lib/api: undefine _FORTIFY

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Date:	Tue, 21 Apr 2015 19:19:41 -0400
From:	Bobby Powers <bobbypowers@...il.com>
To:	linux-kbuild@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>
Cc:	Bobby Powers <bobbypowers@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Dirk Gouders <dirk@...ders.net>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>, Michal Marek <mmarek@...e.cz>
Subject: [PATCH v2] tools/lib/api: undefine _FORTIFY_SOURCE before setting it

Some toolchains (like Hardened Gentoo) define _FORTIFY_SOURCE in the
built-in, default args.  This causes perf builds to fail with:

<command-line>:0:0: error: "_FORTIFY_SOURCE" redefined [-Werror]
<built-in>: note: this is the location of the previous definition
cc1: all warnings being treated as errors

To avoid this, undefine _FORTIFY_SOURCE before (possibly
re-)defining it in tools/lib/api.

v2 applies cleanly on top of already pulled kbuild changes for 4.1-rc1.

Signed-off-by: Bobby Powers <bobbypowers@...il.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/lib/api/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/api/Makefile b/tools/lib/api/Makefile
index d8fe29f..8bd9606 100644
--- a/tools/lib/api/Makefile
+++ b/tools/lib/api/Makefile
@@ -16,7 +16,7 @@ MAKEFLAGS += --no-print-directory
 LIBFILE = $(OUTPUT)libapi.a
 
 CFLAGS := $(EXTRA_WARNINGS) $(EXTRA_CFLAGS)
-CFLAGS += -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -D_FORTIFY_SOURCE=2 -fPIC
+CFLAGS += -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fPIC
 CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 
 RM = rm -f
-- 
2.3.5

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