Declare all targets PHONY

Question

Consider a long makefile with numerous targets, all of which are PHONY (meaning that the target name does not represent an existing file).

I can do either:<

Answer 1

One way to do it:

.PHONY: $(shell sed -n -e '/^$$/ { n ; /^[^ .\#][^ ]*:/ { s/:.*$$// ; p ; } ; }' $(MAKEFILE_LIST))

Works perfectly even for targets mentioned as dependencies.