WIP: makefile

packet-exchange/build/Makefile

@@ -35,9 +35,9 @@ endif
 
 vpath %.c $(SRCDIR)
 
-xdp_kern.o: 
-	clang -S -target bpf -D __BPF_TRACING__ -Wall -O2 -emit-llvm -c -g -o xdp_kern.ll xdp_kern.c
-	llc -march=bpf -filetype=obj -o xdp_kern.o xdp_kern.ll
+xdp_kern.o: xdp_kern.c
+	clang -S -target bpf -D __BPF_TRACING__ -Wall -O2 -emit-llvm -c -g -o xdp_kern.ll $^
+	llc -march=bpf -filetype=obj -o $@ xdp_kern.ll
 
 ifneq ($(WITH_XDP),)
 $(SERVER_PROG): $(SERVER_OBJS) xdp_kern.o