[PATCH] selftests: sync: missing CFLAGS while compiling

[Anders Roxell]

Based on patch: https://patchwork.kernel.org/patch/10042045/

arch64-linux-gnu-gcc -c sync.c -o sync/sync.o
sync.c:42:29: fatal error: linux/sync_file.h: No such file or directory
 #include <linux/sync_file.h>
                             ^
CFLAGS is not used during the compile step, so the system instead of
kernel headers are used.  Fix this by using lib.mk's compile rules and
remove CFLAGS from the linking step.

Reported-by: Lei Yang <Lei.Yang@xxxxxxxxxxxxx>
Signed-off-by: Anders Roxell <anders.roxell@xxxxxxxxxx>
---
 tools/testing/selftests/sync/Makefile | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/tools/testing/selftests/sync/Makefile b/tools/testing/selftests/sync/Makefile
index b3c8ba3cb668..58b9336d6c84 100644
--- a/tools/testing/selftests/sync/Makefile
+++ b/tools/testing/selftests/sync/Makefile
@@ -27,12 +27,6 @@ OBJS := $(patsubst %,$(OUTPUT)/%,$(OBJS))
 TESTS := $(patsubst %,$(OUTPUT)/%,$(TESTS))
 
 $(TEST_CUSTOM_PROGS): $(TESTS) $(OBJS)
-	$(CC) -o $(TEST_CUSTOM_PROGS) $(OBJS) $(TESTS) $(CFLAGS) $(LDFLAGS)
-
-$(OBJS): $(OUTPUT)/%.o: %.c
-	$(CC) -c $^ -o $@
-
-$(TESTS): $(OUTPUT)/%.o: %.c
-	$(CC) -c $^ -o $@
+	$(CC) -o $(TEST_CUSTOM_PROGS) $(OBJS) $(TESTS) $(LDFLAGS)
 
 EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(OBJS) $(TESTS)
-- 
2.11.0