# subdirmk - rules for regenerating makefiles etc. # Copyright 2019 Mark Wooding # Copyright 2019 Ian Jackson # SPDX-License-Identifier: LGPL-2.0-or-later # Usage: # include subdirmk/regen.mk # (probably in toplevel Subdir.sd.mk) # # Arranges that config.status is automatically rerun to update # makefiles from templates, whenever a template *.sd.mk or *.mk.in is # edited; and that autoconf is rerun if configure's inputs are edited. # # If you add includes to configure.ac, add them to CONFIGURE_ACS. # # Also provides a `realclean::' target at the toplevel which deletes # the autoconf output. This may be made into a recursive target # by mentioning &TARGETS_realclean in appropriate .sd.mk. CONFIGURE ?= configure CONFIGURE_AC ?= $(CONFIGURE).ac CONFIG_STATUS ?= config.status CONFIGURE_ACS += $(CONFIGURE_AC) CONFIGURE_ACS += subdirmk/subdirmk.ac $(top_srcdir)/$(CONFIGURE): $(addprefix $(top_srcdir)/,$(CONFIGURE_ACS)) cd $(top_srcdir) && autoconf $(CONFIG_STATUS): $(top_srcdir)/$(CONFIGURE) ./$(CONFIG_STATUS) --recheck # Normally, generate will add all the inputs to MAKEFILE_TEMPLATES. MAKEFILE_TEMPLATES += $(addprefix $(top_srcdir)/, $(addsuffix .in, \ @_SUBDIRMK_MAKEFILES@ \ )) main.mk $(SUBDIRMK_MAKEFILES) $(CONFIG_STATUS_OUTPUTS): .makefiles.stamp @: .makefiles.stamp: \ $(top_srcdir)/subdirmk/generate \ $(CONFIG_STATUS) \ $(MAKEFILE_TEMPLATES) # This filtering arranges that we can often run config.status to # generate only particular output files. We look for *inputs* that # have changed. If the only inputs that have changed are ones that we # know affect only one output (Subdir.sd.mk and *.mk.in), we pass # config.status the corresponding output file names. Otherwise we # pass nothing and config.status does them all. We need to mention # Subdir.sd.mk twice because if $(top_srcdir) is `.', make elides the # directory part from $?. ./$(CONFIG_STATUS) $(if \ $(filter-out Subdir.sd.mk %/Subdir.sd.mk \ %.mk.in \ , $?),, \ $(patsubst $(top_srcdir)/%,%, $(sort \ $(patsubst %.sd.mk,%.mk,$(filter %.sd.mk,$?)) \ $(patsubst %.mk.in,%.mk,$(filter %.mk.in,$?))))) touch $@ realclean:: clean $(RM) config.status config.log $(RM) main.mk $(SUBDIRMK_MAKEFILES) @_SUBDIRMK_MAKEFILES@ $(RM) $(addsuffix Makefile,$(dir $(SUBDIRMK_MAKEFILES))) -include $(ALL_DEPFILES)