Recursive make with positional arguments

Makefile

# To make a sandwich:
# $ make <track> sandwich
# e.g.: make alpha sandwich
#
# This works by rewriting MAKECMDGOALS by stripping the argument from the list
# and recursively calling make with a variable assignment (e.g. track=alpha)
# and the remaining goal(s).
#
# The ifeq below ensures that the “real” goals aren’t executed unless the
# track variable is set. The @: command silences the “Nothing to be done”
# warning.

alpha beta: track = $@
alpha beta: goals = $(patsubst $@,,$(MAKECMDGOALS))
alpha beta:
	@$(MAKE) track=$(track) $(goals)

ifeq ($(track),)
sandwich:
	@:
else
sandwich_type = sandwich-$(track)

sandwich:
	@test $(track)
	@echo Making $(sandwich_type)
endif