Here's what I've 'done so far
__BEGIN__
PROJECTS := lde ldg ldm ldf ldw lbf ldb
BB_lde := a
BB_ldg := b c
BB_ldm := d e f
BB_ldf := g h i j
BB_ldw := k l n m o
BB_lbf := p q r s t u
BB_ldb := v w x y z aa ab
.PHONY : all \
${PROJECTS} \
$(addprefix BB_ , ${PROJECTS})
define proj_template
$(1): $(addprefix BB_ , ${PROJECTS})
echo $(1)
endef
define bb_template
$(1):
echo $(1)
endef
all : ${PROJECTS}
$(foreach var,$(proj),$(eval $(call proj_template,$(var))))
$(filter-out ldb,${proj}) : ldb
$(foreach proj \
, ${PROJECTS} \
, $(foreach bb \
, $(addprefix BB_ , ${PROJECTS}) \
, $(eval $(call bb_template, ${bb})) \
) \
)
# then there will be a TOPIC_<proj>_<bb>
# then TARGET_<proj>_<bb>_<topic>
__END__
gmake -f x
gmake: Nothing to be done for `all'.
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