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

elpa test src:
	@mkdir $@

test/shared: | test
	@mkdir $@

generated_headers =

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

generated_headers += elpa/elpa_generated.h
elpa/elpa_generated.h: $(top_srcdir)/src/elpa_impl.F90 \
                       $(top_srcdir)/src/elpa_impl_math_template.F90 \
                       $(top_srcdir)/src/elpa_api.F90 | elpa
	@rm -f $@
	$(call extract_interface,!c>)
	$(call extract_interface,!c_o>)
	$(call extract_interface,!c_no>)

#if OPTIONAL_C_ERROR_ARGUMENT
#
#elpa/elpa_generated.h: $(top_srcdir)/src/elpa_impl.F90 \
#                       $(top_srcdir)/src/elpa_impl_math_template.F90 \
#                       $(top_srcdir)/src/elpa_api.F90 | elpa
#	$(call extract_interface,!c_o>)
#
#else
#elpa/elpa_generated.h: $(top_srcdir)/src/elpa_impl.F90 \
#                       $(top_srcdir)/src/elpa_impl_math_template.F90 \
#                       $(top_srcdir)/src/elpa_api.F90 | elpa
#	$(call extract_interface,!c_no>)
#endif

generated_headers += elpa/elpa_generated_legacy.h
elpa/elpa_generated_legacy.h: $(top_srcdir)/src/elpa_driver/legacy_interface/elpa_driver_c_interface.F90 \
                       $(top_srcdir)/src/elpa1/legacy_interface/elpa_1stage_c_interface.F90 \
                       $(top_srcdir)/src/elpa2/legacy_interface/elpa_2stage_c_interface.F90 | elpa
	@rm -f $@
	$(call extract_interface,!lc>)


generated_headers += test/shared/generated.h
test/shared/generated.h: $(wildcard $(top_srcdir)/test/shared/*.*90) | test/shared
	@rm -f $@
	$(call extract_interface,!c>)

generated_headers += src/elpa_generated_fortran_interfaces.h
src/elpa_generated_fortran_interfaces.h: $(filter-out $(wildcard $(top_srcdir)/src/*generated*), $(wildcard $(top_srcdir)/src/elpa2/kernels/*.c $(top_srcdir)/src/elpa2/kernels/*.s $(top_srcdir)/src/*.[ch] $(top_srcdir)/src/elpa_generalized/*.[ch])) | src
	@rm -f $@
	$(call extract_interface,!f>)
	$(call extract_interface,#!f>)

generated_headers += src/elpa_generated_public_fortran_interfaces.h
src/elpa_generated_public_fortran_interfaces.h: $(filter-out $(wildcard $(top_srcdir)/src/*generated*), $(wildcard $(top_srcdir)/src/*.[ch])) | src
	@rm -f $@
	$(call extract_interface,!pf>)

generated_headers += src/fortran_constants.F90
src/fortran_constants.F90: $(top_srcdir)/src/fortran_constants.h | src
	@$(CPP) $(CPPFLAGS) -I$(top_builddir)/ -I$(top_srcdir)/ -I. $< -o $@_ || { rm -f $@; exit 1; }
	@awk '/!ELPA_C_DEFINE/ {gsub(/!ELPA_C_DEFINE/, "\n"); gsub(/NEWLINE/, "\n"); print;}' < $@_ > $@ || { rm -f $@; exit 1; }
	@rm $@_


generated-headers: $(generated_headers)

# vim: syntax=make