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# expect protoc compile/link only once.
test: foo
foo: foo.o bar.o
echo link $@ from $<
%.o: %.c FORCE_DO_CMD
echo compile $@ from $<
.PHONY: FORCE_DO_CMD
FORCE_DO_CMD:
foo.c: | protoc
foo.c: foo.proto
echo protoc $@ from $<
foo.proto:
bar.c: | protoc
bar.c: bar.proto
echo protoc $@ from $<
bar.proto:
protoc: proto.o
echo link $@ from $<
proto.c:
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