Namhyung Kim noticed that the stackprotector testcase was incomplete:

  > The flag being checked should be -"W"stack-protector instead of
  > -"f"stack-protector.  And the gcc manpage says that -Wstack-protector is
  > only active when -fstack-protector is active.  So the end result should
  > look like
  >
  >         $(BUILD) -Werror -fstack-protector -Wstack-protector

Add -Wstack-protector.

Reported-by: Namhyung Kim <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
---
 tools/perf/config/feature-checks/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/config/feature-checks/Makefile 
b/tools/perf/config/feature-checks/Makefile
index 2eb8346..c70d23e 100644
--- a/tools/perf/config/feature-checks/Makefile
+++ b/tools/perf/config/feature-checks/Makefile
@@ -45,7 +45,7 @@ test-stackprotector-all:
        $(BUILD) -Werror -fstack-protector-all
 
 test-stackprotector:
-       $(BUILD) -Werror -fstack-protector
+       $(BUILD) -Werror -fstack-protector -Wstack-protector
 
 test-fortify-source:
        $(BUILD) -O2 -Werror -D_FORTIFY_SOURCE=2
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