[RFC PATCH 4/5] samples/bpf: Add proper prefix to objects in Makefile

[He Kuang]

Always use $(obj) when referring to generated files and use $(src) when
referring to files located in the src tree.

Signed-off-by: He Kuang <hekuang@xxxxxxxxxx>
---
 samples/bpf/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 76e3458..8fdbd73 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -44,7 +44,7 @@ HOSTLOADLIBES_tracex4 += -lelf -lrt
 # point this to your LLVM backend with bpf support
 LLC=$(srctree)/tools/bpf/llvm/bld/Debug+Asserts/bin/llc
 
-%.o: %.c
+$(obj)/%.o: $(src)/%.c
 	clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
 		-D__KERNEL__ -Wno-unused-value -Wno-pointer-sign \
 		-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
-- 
1.8.5.2

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