# SPDX-License-Identifier: GPL-2.0-only
# ===========================================================================
# OpenWrt configuration targets

.PHONY: clean all
all: conf mconf
clean:
	rm -f $(clean-files) $(hostprogs)

clean-files	:= *.o lxdialog/*.o *.moc qconf-moc.cc \
		   *conf-cfg # <- This should be removed after 23.05 is EOL

# ===========================================================================
# Variables needed by the upstream Makefile

export HOSTPKG_CONFIG=pkg-config
CONFIG_SHELL:=$(SHELL)
src:=$(CURDIR)
obj:=.
Q:=$(if $V,,@)
quiet:=$(if $V,,_silent)
include Kbuild.include

### Stripped down upstream Makefile follows:
# ===========================================================================
# object files used by all kconfig flavours
common-objs	:= confdata.o expr.o lexer.lex.o menu.o parser.tab.o \
		   preprocess.o symbol.o util.o

$(obj)/lexer.lex.o: $(obj)/parser.tab.h
HOSTCFLAGS_lexer.lex.o	:= -I $(srctree)/$(src)
HOSTCFLAGS_parser.tab.o	:= -I $(srctree)/$(src)

# conf: Used for defconfig, oldconfig and related targets
hostprogs	+= conf
conf-objs	:= conf.o $(common-objs)

# nconf: Used for the nconfig target based on ncurses
hostprogs	+= nconf
nconf-objs	:= nconf.o nconf.gui.o $(common-objs)

HOSTLDLIBS_nconf       = $(call read-file, $(obj)/nconf-libs)
HOSTCFLAGS_nconf.o     = $(call read-file, $(obj)/nconf-cflags)
HOSTCFLAGS_nconf.gui.o = $(call read-file, $(obj)/nconf-cflags)

$(obj)/nconf: | $(obj)/nconf-libs
$(obj)/nconf.o $(obj)/nconf.gui.o: | $(obj)/nconf-cflags

# mconf: Used for the menuconfig target based on lxdialog
hostprogs	+= mconf
lxdialog	:= $(addprefix lxdialog/, \
		     checklist.o inputbox.o menubox.o textbox.o util.o yesno.o)
mconf-objs	:= mconf.o $(lxdialog) $(common-objs)

HOSTLDLIBS_mconf = $(call read-file, $(obj)/mconf-libs)
$(foreach f, mconf.o $(lxdialog), \
  $(eval HOSTCFLAGS_$f = $$(call read-file, $(obj)/mconf-cflags)))

$(obj)/mconf: | $(obj)/mconf-libs
$(addprefix $(obj)/, mconf.o $(lxdialog)): | $(obj)/mconf-cflags

# qconf: Used for the xconfig target based on Qt
hostprogs	+= qconf
qconf-cxxobjs	:= qconf.o qconf-moc.o
qconf-objs	:= images.o $(common-objs)

HOSTLDLIBS_qconf         = $(call read-file, $(obj)/qconf-libs)
HOSTCXXFLAGS_qconf.o     = -std=c++11 -fPIC $(call read-file, $(obj)/qconf-cflags)
HOSTCXXFLAGS_qconf-moc.o = -std=c++11 -fPIC $(call read-file, $(obj)/qconf-cflags)
$(obj)/qconf: | $(obj)/qconf-libs
$(obj)/qconf.o $(obj)/qconf-moc.o: | $(obj)/qconf-cflags

quiet_cmd_moc = MOC     $@
      cmd_moc = $(call read-file, $(obj)/qconf-bin)/moc $< -o $@

$(obj)/qconf-moc.cc: $(src)/qconf.h FORCE | $(obj)/qconf-bin
	$(call if_changed,moc)

targets += qconf-moc.cc

# check if necessary packages are available, and configure build flags
cmd_conf_cfg = $< $(addprefix $(obj)/$*conf-, cflags libs bin); touch $(obj)/$*conf-bin

$(obj)/%conf-cflags $(obj)/%conf-libs $(obj)/%conf-bin: $(src)/%conf-cfg.sh
	$(call cmd,conf_cfg)

clean-files += *conf-cflags *conf-libs *conf-bin

# ===========================================================================
# OpenWrt rules and final adjustments that need to be made after reading the
# full upstream Makefile

FORCE:

ifdef BUILD_SHIPPED_FILES
shipped-files := lexer.lex.c parser.tab.c parser.tab.h
clean-files += $(shipped-files)

.SECONDARY: $(shipped-files)

%.tab.c %.tab.h: %.y
	bison -l -d -b $* $<

%.lex.c: %.l
	flex -L -o$@ $<
endif

define link_rule
$(1): LDLIBS+=$$(HOSTLDLIBS_$(1))
$(1): $($(1)-objs) $$($(1)-cxxobjs)
$(if $($(1)-cxxobjs),	$(CXX) $$(LDFLAGS) -o $$@ $$^ $$(LDLIBS))
all-objs += $($(1)-objs)
all-cxxobjs += $($(1)-cxxobjs)
endef

all-objs:=
all-cxxobjs:=
$(foreach f,$(hostprogs),$(eval $(call link_rule,$f)))


$(foreach f,$(sort $(all-objs)), \
  $(eval $f: CFLAGS+=$$(HOSTCFLAGS_$f)))

$(foreach f,$(sort $(all-cxxobjs)), \
  $(eval $f: CXXFLAGS+=$$(HOSTCXXFLAGS_$f)))