define extract_interface
	@echo "Generating $@...";
	@grep -h "^ *$1" $^ | sed 's/^ *$1//;' >> $@ || { rm $@; exit 1; }
endef

elpa test:
	@mkdir $@

test/shared: | test
	@mkdir $@

config-f90.h: config.h
	@echo "Generating $@...";
	@grep "^#define" $^ > $@ || { rm $@; exit 1; }

elpa/elpa_generated.h: $(top_srcdir)/src/elpa_c_interface.F90 | elpa
	$(call extract_interface,!c>)

test/shared/generated.h: $(wildcard $(top_srcdir)/test/shared/*.F90) | test/shared
	$(call extract_interface,!c>)

elpa/elpa_generated_fortran_interfaces.h: $(wildcard $(top_srcdir)/src/elpa2_kernels/*.c) $(wildcard $(top_srcdir)/src/elpa2_kernels/*.s) | elpa
	$(call extract_interface,!f>)
	$(call extract_interface,#!f>)

generated_headers= config-f90.h elpa/elpa_generated.h test/shared/generated.h elpa/elpa_generated_fortran_interfaces.h
generated-headers: $(generated_headers)