Makefile to recursively run all makefiles in subfolders with specified targets

Makefile

## See https://stackoverflow.com/a/11206700/632423

## adjust when different
SUBDIRS := $(wildcard */.)  # e.g. "foo/. bar/."
TARGETS := all build build-cran check clean clean_check clean_readme deps docs drat files # whatever else, but must not contain '/'
##

# foo/.all bar/.all foo/.clean bar/.clean
SUBDIRS_TARGETS := \
	$(foreach t,$(TARGETS),$(addsuffix $t,$(SUBDIRS)))

.PHONY : $(TARGETS) $(SUBDIRS_TARGETS)

# static pattern rule, expands into:
# all clean : % : foo/.% bar/.%
$(TARGETS) : % : $(addsuffix %,$(SUBDIRS))
	@echo 'Done "$*" target'

# here, for foo/.all:
#   $(@D) is foo
#   $(@F) is .all, with leading period
#   $(@F:.%=%) is just all
$(SUBDIRS_TARGETS) :
	@echo
	@echo "#######" make $(@D) $(@F:.%=%)
	$(MAKE) -C $(@D) $(@F:.%=%) 
	@echo "#######" Done
	@echo
    
############# Help targets #############

list_variables:
	@echo
	@echo "#############################################"
	@echo "## Variables ################################"
	make -pn | grep -A1 "^# makefile"| grep -v "^#\|^--" | sort | uniq
	@echo "#############################################"
	@echo ""( input, output )

## from https://stackoverflow.com/a/26339924/632423
list_targets:
	@echo
	@echo "#############################################"
	@echo "## Targets    ###############################"
	@$(MAKE) -pRrq -f $(lastword $(MAKEFILE_LIST)) : 2>/dev/null | awk -v RS= -F: '/^# File/,/^# Finished Make data base/ {if ($$1 !~ "^[#.]") {print $$1}}' | sort | egrep -v -e '^[^[:alnum:]]' -e '^$@$$'
	@echo "#############################################"
	@echo

list: list_variables list_targets

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