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escape = $(subst ','\'',$(1))
test_var ?= This is safe.
test_var := $(value test_var)
export test_var
inner_var := Inner variable
outer_var := Outer variable - $(inner_var) - $(test_var)
echo_test_var := printf '%s\n' '$(call escape,$(test_var))'
bash_test_var := bash -c '$(call escape,$(echo_test_var))'
echo_outer_var := printf '%s\n' '$(call escape,$(outer_var))'
.PHONY: test
test:
@printf '%s\n' '$(call escape,$(test_var))'
@printf '%s\n' "$$test_var"
@bash -c '$(call escape,$(echo_test_var))'
@bash -c '$(call escape,$(bash_test_var))'
@printf '%s\n' '$(call escape,$(outer_var))'
@bash -c '$(call escape,$(echo_outer_var))'
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