michael@0: test = $0
michael@0: reverse = $2 $1
michael@0: twice = $1$1
michael@0: sideeffect = $(shell echo "called$1:" >>dummyfile)
michael@0: 
michael@0: all:
michael@0: 	test "$(call test)" = "test"
michael@0: 	test "$(call reverse,1,2)" = "2 1"
michael@0: # expansion happens *before* substitution, thank sanity
michael@0: 	test "$(call twice,$(sideeffect))" = ""
michael@0: 	test `cat dummyfile` = "called:"
michael@0: 	@echo TEST-PASS