# the names of every source file, separated by space;
# you can use a wildcard, or specify the explicitly
F90SRC=$(wildcard *.f90)

# directory in which the object files are located (optional);
# it must end with a slash
#OBJPREFIX=obj/

# note: it's probably a bad idea to put this snippet
#       before the first target rule in the makefile

# extract the dependencies of the project
# (the '@' before 'for' silences the output of this command)
#
# note: this is kind of a hack, as all it does is to search the
#       sources for a line that looks like "use <module>"
dependencies.mk: $(F90SRC)
	@for f in $^; do \
	    printf "%s:" "$(OBJPREFIX)$${f%.f90}.o"; \
	    awk -v p="$(OBJPREFIX)" \
	        '$$1 == "use" && NF == 2 { printf " %s%s.o",p,$$2 }' "$$f"; \
	    echo; \
	done >$@.tmp; \
	mv $@.tmp $@

include dependencies.mk