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Subject[097/143] perf tools: Test -fstack-protector-all compiler option for inclusion in CFLAGS
2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------
From: Michael Cree <mcree@orcon.net.nz>

commit 5d7bdab75cd56d2bdc0986ae5546be3b09fea70a upstream.

Some architectures (e.g. Alpha) do not support the
-fstack-protector-all compiler option and the use of the option
with -Werror causes the compiler to abort and the build fails.

Test that the compiler supports -fstack-protector-all before
inclusion in CFLAGS.

Signed-off-by: Michael Cree <mcree@orcon.net.nz>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091111074302.GA3728@omega>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
[bwh: Backport to 2.6.32]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
tools/perf/Makefile | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -207,7 +207,7 @@ ifndef PERF_DEBUG
CFLAGS_OPTIMIZE = -O6
endif

-CFLAGS = $(MBITS) -ggdb3 -Wall -Wextra -std=gnu99 -Werror $(CFLAGS_OPTIMIZE) -fstack-protector-all -D_FORTIFY_SOURCE=2 $(EXTRA_WARNINGS)
+CFLAGS = $(MBITS) -ggdb3 -Wall -Wextra -std=gnu99 -Werror $(CFLAGS_OPTIMIZE) -D_FORTIFY_SOURCE=2 $(EXTRA_WARNINGS)
LDFLAGS = -lpthread -lrt -lelf -lm
ALL_CFLAGS = $(CFLAGS)
ALL_LDFLAGS = $(LDFLAGS)
@@ -261,6 +261,9 @@ 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 >/dev/null 2>&1 && echo y"), y)
+ CFLAGS := $(CFLAGS) -fstack-protector-all
+endif


### --- END CONFIGURATION SECTION ---



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