| # 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: |