# Bug in GNU Make 4.2.1
#
# defining a variable that has been undefined in a foreach loop produce a
# segfault on X64 machine.
#
# Disabling export avoid the sefault
export

# As same as disabling this part define
DISCARD_ENV := templates from script format
define discard_env
	$(foreach var,$(DISCARD_ENV),$(eval undefine $(var)))
endef

ARTIFACTS := build/a build/b

# In this situation: defining a variable that has been undefined
# in the foreach loop befaure causes the segfault:
templates := t1.tpl t2.tpl # <----
format := qcow2

.PHONY: all
all: $(ARTIFACTS)

$(ARTIFACTS):
	@echo $@