linux-kernel - [PATCH] perf tools: Test if programs with -fstack-prtoector-all link

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Date:	Mon, 11 Jan 2010 14:49:28 +0100
From:	Michal Nazarewicz <m.nazarewicz@...sung.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-kernel@...r.kernel.org
Cc:	Michal Nazarewicz <m.nazarewicz@...sung.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>
Subject: [PATCH] perf tools: Test if programs with -fstack-prtoector-all link

The -fstack-protector may need additional library to be present in
system thus it is not enough to test if compiler compiles program
but also whether linker links it thus "-c" flag has been removed

Signed-off-by: Michal Nazarewicz <m.nazarewicz@...sung.com>
---
 tools/perf/Makefile |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

 As I was corss-compiling perf compiler handled -fstack-protector-all
 nicely and so the flag has been added to CFLAGS however test for
 presence of libelf failed because linker could not link with ssp_nonshared
 library.  Removing "-c" from the -fstack-protector-all test code fixed
 problem by forcing linking and thus testing if not only compiler but the
 whole toolchain supported stack protector.

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 652a470..223e5f5 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -250,7 +250,7 @@ PTHREAD_LIBS = -lpthread
 # explicitly what architecture to check for. Fix this up for yours..
 SPARSE_FLAGS = -D__BIG_ENDIAN__ -D__powerpc__
 
-ifeq ($(shell sh -c "echo 'int foo(void) {char X[2]; return 3;}' | $(CC) -x c -c -Werror -fstack-protector-all - -o /dev/null "$(QUIET_STDERR)" && echo y"), y)
+ifeq ($(shell sh -c "echo 'int foo(void) {char X[2]; return 3;}' | $(CC) -x c -Werror -fstack-protector-all - -o /dev/null "$(QUIET_STDERR)" && echo y"), y)
   CFLAGS := $(CFLAGS) -fstack-protector-all
 endif
 
-- 
1.6.5


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