[PATCH 5.9 017/255] selftests: filter kselftest headers from command in lib.mk

[Greg Kroah-Hartman]

From: Tommi Rantala <tommi.t.rantala@xxxxxxxxx>

[ Upstream commit f825d3f7ed9305e7dd0a3e0a74673a4257d0cc53 ]

Commit 1056d3d2c97e ("selftests: enforce local header dependency in
lib.mk") added header dependency to the rule, but as the rule uses $^,
the headers are added to the compiler command line.

This can cause unexpected precompiled header files being generated when
compilation fails:

  $ echo { >> openat2_test.c

  $ make
  gcc -Wall -O2 -g -fsanitize=address -fsanitize=undefined  openat2_test.c
    tools/testing/selftests/kselftest_harness.h tools/testing/selftests/kselftest.h helpers.c
    -o tools/testing/selftests/openat2/openat2_test
  openat2_test.c:313:1: error: expected identifier or ‘(’ before ‘{’ token
    313 | {
        | ^
  make: *** [../lib.mk:140: tools/testing/selftests/openat2/openat2_test] Error 1

  $ file openat2_test*
  openat2_test:   GCC precompiled header (version 014) for C
  openat2_test.c: C source, ASCII text

Fix it by filtering out the headers, so that we'll only pass the actual
*.c files in the compiler command line.

Fixes: 1056d3d2c97e ("selftests: enforce local header dependency in lib.mk")
Signed-off-by: Tommi Rantala <tommi.t.rantala@xxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 tools/testing/selftests/lib.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index 7a17ea8157367..66f3317dc3654 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -137,7 +137,7 @@ endif
 ifeq ($(OVERRIDE_TARGETS),)
 LOCAL_HDRS := $(selfdir)/kselftest_harness.h $(selfdir)/kselftest.h
 $(OUTPUT)/%:%.c $(LOCAL_HDRS)
-	$(LINK.c) $^ $(LDLIBS) -o $@
+	$(LINK.c) $(filter-out $(LOCAL_HDRS),$^) $(LDLIBS) -o $@
 
 $(OUTPUT)/%.o:%.S
 	$(COMPILE.S) $^ -o $@
-- 
2.27.0