michael@0: $(shell touch foo.testfile1 foo.testfile2)
michael@0: 
michael@0: # when a rule has commands and no prerequisites, should it be executed?
michael@0: # double-colon: yes
michael@0: # single-colon: no
michael@0: 
michael@0: all: foo.testfile1 foo.testfile2
michael@0: 	test "$$(cat foo.testfile1)" = ""
michael@0: 	test "$$(cat foo.testfile2)" = "remade:foo.testfile2"
michael@0: 	@echo TEST-PASS
michael@0: 
michael@0: foo.testfile1:
michael@0: 	@echo TEST-FAIL
michael@0: 
michael@0: foo.testfile2::
michael@0: 	printf "remade:$@"> $@