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MAKEFLAGS += --warn-undefined-variables
.DEFAULT_GOAL := all
.DELETE_ON_ERROR:
.SUFFIXES:
SHELL := bash
.SHELLFLAGS := -e -o pipefail -c
escape = $(subst ','\'',$(1))
define escape_arg
ifeq ($$(origin $(1)),environment)
$(1) := $$(value $(1))
endif
ifeq ($$(origin $(1)),environment override)
$(1) := $$(value $(1))
endif
ifeq ($$(origin $(1)),command line)
override $(1) := $$(value $(1))
endif
endef
simple_var := Simple value
test_var ?= $(simple_var) in test_var
$(eval $(call escape_arg,test_var))
simple_var := New simple value
composite_var := Composite value - $(simple_var) - $(test_var)
.PHONY: test
test:
@printf '%s\n' '$(call escape,$(test_var))'
@printf '%s\n' '$(call escape,$(composite_var))'
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