1# expect protoc compile/link only once. 2test: foo 3 4foo: foo.o bar.o 5 echo link $@ from $< 6 7%.o: %.c FORCE_DO_CMD 8 echo compile $@ from $< 9 10.PHONY: FORCE_DO_CMD 11FORCE_DO_CMD: 12 13foo.c: | protoc 14 15foo.c: foo.proto 16 echo protoc $@ from $< 17 18foo.proto: 19 20bar.c: | protoc 21 22bar.c: bar.proto 23 echo protoc $@ from $< 24 25bar.proto: 26 27protoc: proto.o 28 echo link $@ from $< 29 30proto.c: 31