In order to probe availability of certain features the Makefile test
compiles a handful of tiny snippets, feeding those in from stdin.  However
in one case - the one for -fstack-protector - it forgets to redirect the
output to stdout, meaning it creates a stray '-.s' file when make is
invoked (even make clean).

Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index f918bb8..b0dde68 100644
--- a/Makefile
+++ b/Makefile
@@ -78,7 +78,7 @@ ifeq ($(shell printf "$(C)" | $(CC) -S -xc - -o - >/dev/null 2>&1; echo $$?),0)
 	CFLAGS += -DHAS_GETRANDOM
 endif
 
-ifeq ($(shell :|$(CC) -fstack-protector-strong -S -xc - >/dev/null 2>&1; echo $$?),0)
+ifeq ($(shell :|$(CC) -fstack-protector-strong -S -xc - -o - >/dev/null 2>&1; echo $$?),0)
 	CFLAGS += -fstack-protector-strong
 endif
 
-- 
2.36.1