util/kconfig: Uprev to Linux 5.13's kconfig

This was originally several commits that had to be squashed into one
because the intermediate states weren't able to build coreboot:

 - one to remove everything that wasn't our own code, leaving only
   regex.[ch], toada.c, description.md and Makefile.inc.
 - one to copy in Linux 5.13's scripts/kconfig and adapt Makefile.inc
   to make the original Makefile work again.
 - adapt abuild to use olddefconfig, simplifying matters.
 - apply patches in util/kconfig/patches.
 - Some more adaptations to the libpayload build system.

The patches are now in util/kconfig/patches/, reverse applying them
should lead to a util/kconfig/ tree that contains exactly the Linux
version + our own 5 files.

Change-Id: Ia0e8fe4e9022b278f34ab113a433ef4d45e5c355
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37152
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

1 files changed, 166 insertions, 330 deletions

diff --git a/util/kconfig/Makefile b/util/kconfig/Makefile
index 1713b8d0eb..5a215880b2 100644
--- a/util/kconfig/Makefile
+++ b/util/kconfig/Makefile
@@ -1,377 +1,213 @@
+# SPDX-License-Identifier: GPL-2.0
 # ===========================================================================
 # Kernel configuration targets
 # These targets are used from top-level makefile
 
-export LC_ALL=C
-export LANG=C
-
-DEFCONFIG?=defconfig
+ifdef KBUILD_KCONFIG
+Kconfig := $(KBUILD_KCONFIG)
+else
+Kconfig := Kconfig
+endif
 
-PHONY += oldconfig xconfig gconfig menuconfig config silentoldconfig update-po-config \
-	localmodconfig localyesconfig
+ifndef KBUILD_DEFCONFIG
+KBUILD_DEFCONFIG := defconfig
+endif
 
-xconfig: $(objk)/qconf
-	$< $(Kconfig)
+ifeq ($(quiet),silent_)
+silent := -s
+endif
 
-gconfig: $(objk)/gconf
-	cp -f $(srck)/gconf.glade $(objk)/gconf.glade
-	$< $(Kconfig)
+export KCONFIG_DEFCONFIG_LIST :=
+ifndef cross_compiling
+kernel-release := $(shell uname -r)
+KCONFIG_DEFCONFIG_LIST += \
+	/lib/modules/$(kernel-release)/.config \
+	/etc/kernel-config \
+	/boot/config-$(kernel-release)
+endif
+KCONFIG_DEFCONFIG_LIST += arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)
+
+# We need this, in case the user has it in its environment
+unexport CONFIG_
+
+config-prog	:= conf
+menuconfig-prog	:= mconf
+nconfig-prog	:= nconf
+gconfig-prog	:= gconf
+xconfig-prog	:= qconf
+
+define config_rule
+PHONY += $(1)
+$(1): $(obj)/$($(1)-prog)
+	$(Q)$$< $(silent) $(Kconfig)
+
+PHONY += build_$(1)
+build_$(1): $(obj)/$($(1)-prog)
+endef
+
+$(foreach c, config menuconfig nconfig gconfig xconfig, $(eval $(call config_rule,$(c))))
+
+PHONY += localmodconfig localyesconfig
+localyesconfig localmodconfig: $(obj)/conf
+	$(Q)$(PERL) $(srctree)/$(src)/streamline_config.pl --$@ $(srctree) $(Kconfig) > .tmp.config
+	$(Q)if [ -f .config ]; then 				\
+		cmp -s .tmp.config .config ||			\
+		(mv -f .config .config.old.1;			\
+		 mv -f .tmp.config .config;			\
+		 $< $(silent) --oldconfig $(Kconfig);		\
+		 mv -f .config.old.1 .config.old)		\
+	else							\
+		mv -f .tmp.config .config;			\
+		$< $(silent) --oldconfig $(Kconfig);		\
+	fi
+	$(Q)rm -f .tmp.config
 
-menuconfig: $(objk)/mconf
-	$< $(Kconfig)
+# These targets map 1:1 to the commandline options of 'conf'
+#
+# Note:
+#  syncconfig has become an internal implementation detail and is now
+#  deprecated for external use
+simple-targets := oldconfig allnoconfig allyesconfig allmodconfig \
+	alldefconfig randconfig listnewconfig olddefconfig syncconfig \
+	helpnewconfig yes2modconfig mod2yesconfig
 
-config: $(objk)/conf
-	$< --oldaskconfig $(Kconfig)
+PHONY += $(simple-targets)
 
-nconfig: $(objk)/nconf
-	$< $(Kconfig)
+$(simple-targets): $(obj)/conf
+	$(Q)$< $(silent) --$@ $(Kconfig)
 
-# Disable strict mode because oldconfig is typically used to clean up
-# templates and the like. The second invocation should already have sane data.
-oldconfig: $(objk)/conf
-	KCONFIG_STRICT= $< --$@ $(Kconfig)
-	$< --silentoldconfig $(Kconfig)
+PHONY += savedefconfig defconfig
 
-silentoldconfig: $(objk)/conf
-	$< --$@ $(Kconfig)
+savedefconfig: $(obj)/conf
+	$(Q)$< $(silent) --$@=defconfig $(Kconfig)
 
-# --- UNUSED, ignore ----------------------------------------------------------
-localyesconfig localmodconfig: $(obj)/streamline_config.pl $(obj)/conf
-	$(Q)mkdir -p include/generated
-	$(Q)perl $< --$@ $(srctree) $(Kconfig) > .tmp.config
-	$(Q)if [ -f .config ]; then 					\
-			cmp -s .tmp.config .config ||			\
-			(mv -f .config .config.old.1;			\
-			 mv -f .tmp.config .config;			\
-			 $(obj)/conf --silentoldconfig $(Kconfig);	\
-			 mv -f .config.old.1 .config.old)		\
-	else								\
-			mv -f .tmp.config .config;			\
-			$(obj)/conf --silentoldconfig $(Kconfig);	\
-	fi
-	$(Q)rm -f .tmp.config
-
-# Create new linux.pot file
-# Adjust charset to UTF-8 in .po file to accept UTF-8 in Kconfig files
-update-po-config: $(obj)/kxgettext $(obj)/gconf.glade.h
-	$(Q)echo "  GEN     config.pot"
-	$(Q)xgettext --default-domain=linux                         \
-	    --add-comments --keyword=_ --keyword=N_                 \
-	    --from-code=UTF-8                                       \
-	    --files-from=$(srctree)/scripts/kconfig/POTFILES.in     \
-	    --directory=$(srctree) --directory=$(objtree)           \
-	    --output $(obj)/config.pot
-	$(Q)sed -i s/CHARSET/UTF-8/ $(obj)/config.pot
-	$(Q)(for i in `ls $(srctree)/arch/*/Kconfig      \
-	    $(srctree)/arch/*/um/Kconfig`;               \
-	    do                                           \
-		echo "  GEN     $$i";                    \
-		$(obj)/kxgettext $$i                     \
-		     >> $(obj)/config.pot;               \
-	    done )
-	$(Q)echo "  GEN     linux.pot"
-	$(Q)msguniq --sort-by-file --to-code=UTF-8 $(obj)/config.pot \
-	    --output $(obj)/linux.pot
-	$(Q)rm -f $(obj)/config.pot
-# --- UNUSED, ignore ----------------------------------------------------------
-
-PHONY += allnoconfig allyesconfig allmodconfig alldefconfig randconfig savedefconfig
-
-allnoconfig allyesconfig allmodconfig alldefconfig randconfig: $(objk)/conf
-	$< --$@ $(Kconfig)
-
-savedefconfig: $(objk)/conf
-	$< --$@=$(DEFCONFIG) $(Kconfig)
-
-defconfig: $(objk)/conf
-ifeq ($(KBUILD_DEFCONFIG),)
-	$< --defconfig $(Kconfig)
+defconfig: $(obj)/conf
+ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)),)
+	@$(kecho) "*** Default configuration is based on '$(KBUILD_DEFCONFIG)'"
+	$(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG) $(Kconfig)
 else
-	@echo "*** Default configuration is based on '$(KBUILD_DEFCONFIG)'"
-	$< --defconfig=$(KBUILD_DEFCONFIG) $(Kconfig)
+	@$(kecho) "*** Default configuration is based on target '$(KBUILD_DEFCONFIG)'"
+	$(Q)$(MAKE) -f $(srctree)/Makefile $(KBUILD_DEFCONFIG)
 endif
 
-olddefconfig: $(objk)/conf
-	$< --olddefconfig $(Kconfig)
+%_defconfig: $(obj)/conf
+	$(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$@ $(Kconfig)
+
+configfiles=$(wildcard $(srctree)/kernel/configs/$@ $(srctree)/arch/$(SRCARCH)/configs/$@)
+
+%.config: $(obj)/conf
+	$(if $(call configfiles),, $(error No configuration exists for this target on this architecture))
+	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m .config $(configfiles)
+	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
 
-%_defconfig: $(objk)/conf
-	$< --defconfig=configs/$@ $(Kconfig)
+PHONY += tinyconfig
+tinyconfig:
+	$(Q)KCONFIG_ALLCONFIG=kernel/configs/tiny-base.config $(MAKE) -f $(srctree)/Makefile allnoconfig
+	$(Q)$(MAKE) -f $(srctree)/Makefile tiny.config
+
+# CHECK: -o cache_dir=<path> working?
+PHONY += testconfig
+testconfig: $(obj)/conf
+	$(Q)$(PYTHON3) -B -m pytest $(srctree)/$(src)/tests \
+	-o cache_dir=$(abspath $(obj)/tests/.cache) \
+	$(if $(findstring 1,$(KBUILD_VERBOSE)),--capture=no)
+clean-files += tests/.cache
 
 # Help text used by make help
-help_kconfig help::
-	@echo  '*** Kconfig Targets ***'
+help:
 	@echo  '  config	  - Update current config utilising a line-oriented program'
 	@echo  '  nconfig         - Update current config utilising a ncurses menu based program'
 	@echo  '  menuconfig	  - Update current config utilising a menu based program'
-	@echo  '  xconfig	  - Update current config utilising a QT based front-end'
-	@echo  '  gconfig	  - Update current config utilising a GTK based front-end'
+	@echo  '  xconfig	  - Update current config utilising a Qt based front-end'
+	@echo  '  gconfig	  - Update current config utilising a GTK+ based front-end'
 	@echo  '  oldconfig	  - Update current config utilising a provided .config as base'
-	@echo  '  olddefconfig    - Same as oldconfig, but with default answer to all new options'
-	#@echo  '  localmodconfig  - Update current config disabling modules not loaded'
-	#@echo  '  localyesconfig  - Update current config converting local mods to core'
-	@echo  '  silentoldconfig - Same as oldconfig, but quietly, additionally update deps'
-	@echo  '  defconfig	  - New config with default answer to all options'
+	@echo  '  localmodconfig  - Update current config disabling modules not loaded'
+	@echo  '                    except those preserved by LMC_KEEP environment variable'
+	@echo  '  localyesconfig  - Update current config converting local mods to core'
+	@echo  '                    except those preserved by LMC_KEEP environment variable'
+	@echo  '  defconfig	  - New config with default from ARCH supplied defconfig'
 	@echo  '  savedefconfig   - Save current config as ./defconfig (minimal config)'
-	#@echo  '  allnoconfig	  - New config where all options are answered with no'
-	#@echo  '  allyesconfig	  - New config where all options are accepted with yes'
-	#@echo  '  allmodconfig	  - New config selecting modules when possible'
-	#@echo  '  randconfig	  - New config with random answer to all options'
-	@echo
-
-# lxdialog stuff
-check-lxdialog  := $(srck)/lxdialog/check-lxdialog.sh
-
-# Use recursively expanded variables so we do not call gcc unless
-# we really need to do so. (Do not call gcc as part of make mrproper)
-HOST_EXTRACFLAGS += $(shell $(CONFIG_SHELL) $(check-lxdialog) -ccflags) \
-                    -DLOCALE
-HOST_LOADLIBES   = $(shell $(CONFIG_SHELL) $(check-lxdialog) \
-                    -ldflags $(HOSTCC)) -ltinfo
-
+	@echo  '  allnoconfig	  - New config where all options are answered with no'
+	@echo  '  allyesconfig	  - New config where all options are accepted with yes'
+	@echo  '  allmodconfig	  - New config selecting modules when possible'
+	@echo  '  alldefconfig    - New config with all symbols set to default'
+	@echo  '  randconfig	  - New config with random answer to all options'
+	@echo  '  yes2modconfig	  - Change answers from yes to mod if possible'
+	@echo  '  mod2yesconfig	  - Change answers from mod to yes if possible'
+	@echo  '  listnewconfig   - List new options'
+	@echo  '  helpnewconfig   - List new options and help text'
+	@echo  '  olddefconfig	  - Same as oldconfig but sets new symbols to their'
+	@echo  '                    default value without prompting'
+	@echo  '  tinyconfig	  - Configure the tiniest possible kernel'
+	@echo  '  testconfig	  - Run Kconfig unit tests (requires python3 and pytest)'
 
 # ===========================================================================
-# Shared Makefile for the various kconfig executables:
-# conf:	  Used for defconfig, oldconfig and related targets
-# nconf:  Used for the nconfig target.
-#         Utilizes ncurses
-# mconf:  Used for the menuconfig target
-#         Utilizes the lxdialog package
-# qconf:  Used for the xconfig target
-#         Based on QT which needs to be installed to compile it
-# gconf:  Used for the gconfig target
-#         Based on GTK which needs to be installed to compile it
 # 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
 
-lxdialog := lxdialog/checklist.o lxdialog/util.o lxdialog/inputbox.o
-lxdialog += lxdialog/textbox.o lxdialog/yesno.o lxdialog/menubox.o
+$(obj)/lexer.lex.o: $(obj)/parser.tab.h
+HOSTCFLAGS_lexer.lex.o	:= -I $(srctree)/$(src)
+HOSTCFLAGS_parser.tab.o	:= -I $(srctree)/$(src)
 
-conf-objs	:= conf.o  zconf.tab.o $(regex-objs)
-mconf-objs     := mconf.o zconf.tab.o $(lxdialog) $(regex-objs)
-nconf-objs     := nconf.o zconf.tab.o nconf.gui.o
-kxgettext-objs	:= kxgettext.o zconf.tab.o
-qconf-cxxobjs	:= qconf.o
-qconf-objs	:= zconf.tab.o
-gconf-objs	:= gconf.o zconf.tab.o
+# conf: Used for defconfig, oldconfig and related targets
+hostprogs	+= conf
+conf-objs	:= conf.o $(common-objs)
 
-hostprogs-y := conf
+# nconf: Used for the nconfig target based on ncurses
+hostprogs	+= nconf
+nconf-objs	:= nconf.o nconf.gui.o $(common-objs)
 
-ifeq ($(MAKECMDGOALS),nconfig)
-	hostprogs-y += nconf
-endif
+HOSTLDLIBS_nconf	= $(shell . $(obj)/nconf-cfg && echo $$libs)
+HOSTCFLAGS_nconf.o	= $(shell . $(obj)/nconf-cfg && echo $$cflags)
+HOSTCFLAGS_nconf.gui.o	= $(shell . $(obj)/nconf-cfg && echo $$cflags)
 
-ifeq ($(MAKECMDGOALS),menuconfig)
-	hostprogs-y += mconf
-endif
+$(obj)/nconf.o $(obj)/nconf.gui.o: $(obj)/nconf-cfg
 
-ifeq ($(MAKECMDGOALS),update-po-config)
-	hostprogs-y += kxgettext
-endif
-
-ifeq ($(MAKECMDGOALS),xconfig)
-	qconf-target := 1
-endif
-ifeq ($(MAKECMDGOALS),gconfig)
-	gconf-target := 1
-endif
-
-
-ifeq ($(qconf-target),1)
-	hostprogs-y += qconf
-endif
-
-ifeq ($(gconf-target),1)
-	hostprogs-y += gconf
-endif
+# 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)
 
-clean-files	:= qconf.moc .tmp_qtcheck .tmp_gtkcheck
-clean-files	+= zconf.tab.c zconf.lex.c zconf.hash.c gconf.glade.h
-clean-files     += mconf qconf gconf nconf
-clean-files     += config.pot linux.pot
-
-# Check that we have the required ncurses stuff installed for lxdialog (menuconfig)
-PHONY += $(objk)/dochecklxdialog
-$(addprefix $(obj)/,$(lxdialog)): $(objk)/dochecklxdialog
-$(objk)/dochecklxdialog:
-	$(CONFIG_SHELL) $(check-lxdialog) -check $(HOSTCC) $(HOST_EXTRACFLAGS) $(HOST_LOADLIBES)
-
-always := dochecklxdialog
-
-# Add environment specific flags
-HOST_EXTRACFLAGS += $(shell $(CONFIG_SHELL) $(srck)/check.sh $(HOSTCC) $(HOSTCFLAGS))
-
-# generated files seem to need this to find local include files
-HOSTCFLAGS_zconf.lex.o	:= -I$(src)
-HOSTCFLAGS_zconf.tab.o	:= -I$(src)
-
-LEX_PREFIX_zconf	:= zconf
-YACC_PREFIX_zconf	:= zconf
-
-HOSTLOADLIBES_qconf	= $(KC_QT_LIBS) -ldl
-HOSTCXXFLAGS_qconf.o	= $(KC_QT_CFLAGS)
-
-HOSTLOADLIBES_gconf	= `pkg-config --libs gtk+-2.0 gmodule-2.0 libglade-2.0`
-HOSTCFLAGS_gconf.o	= `pkg-config --cflags gtk+-2.0 gmodule-2.0 libglade-2.0` \
-                          -Wno-missing-prototypes
-
-HOSTLOADLIBES_mconf   = $(shell $(CONFIG_SHELL) $(check-lxdialog) -ldflags $(HOSTCC))
-
-HOSTLOADLIBES_nconf	= $(shell \
-				pkg-config --libs menu panel ncurses 2>/dev/null \
-				|| echo "-lmenu -lpanel -lncurses"  )
-
-$(objk)/qconf.o: $(objk)/.tmp_qtcheck
-
-ifeq ($(qconf-target),1)
-$(objk)/.tmp_qtcheck: $(srck)/Makefile
--include $(objk)/.tmp_qtcheck
-
-# QT needs some extra effort...
-$(objk)/.tmp_qtcheck:
-	@set -e; echo "  CHECK   qt"; dir=""; pkg=""; \
-	if pkg-config --exists Qt5Core; then \
-	  cflags="-std=c++11 -fPIC `pkg-config --cflags Qt5Core Qt5Gui Qt5Widgets`"; \
-	  libs=`pkg-config --libs Qt5Core Qt5Gui Qt5Widgets`; \
-	  moc=`pkg-config --variable=host_bins Qt5Core`/moc; \
-	elif pkg-config --exists QtCore; then \
-	  cflags=`pkg-config --cflags QtCore QtGui`; \
-	  libs=`pkg-config --libs QtCore QtGui`; \
-	  moc=`pkg-config --variable=moc_location QtCore`; \
-	else \
-	  echo >&2 "*"; \
-	  echo >&2 "* Could not find Qt via pkg-config."; \
-	  echo >&2 "* Please install either Qt 4.8 or 5.x. and make sure it's in PKG_CONFIG_PATH"; \
-	  echo >&2 "*"; \
-	  exit 1; \
-	fi; \
-	echo "KC_QT_CFLAGS=$$cflags" > $@; \
-	echo "KC_QT_LIBS=$$libs" >> $@; \
-	echo "KC_QT_MOC=$$moc" >> $@
-endif
+HOSTLDLIBS_mconf = $(shell . $(obj)/mconf-cfg && echo $$libs)
+$(foreach f, mconf.o $(lxdialog), \
+  $(eval HOSTCFLAGS_$f = $$(shell . $(obj)/mconf-cfg && echo $$$$cflags)))
 
-$(objk)/gconf.o: $(objk)/.tmp_gtkcheck
-
-ifeq ($(gconf-target),1)
--include $(objk)/.tmp_gtkcheck
-
-# GTK needs some extra effort, too...
-$(objk)/.tmp_gtkcheck:
-	@if `pkg-config --exists gtk+-2.0 gmodule-2.0 libglade-2.0`; then		\
-		if `pkg-config --atleast-version=2.0.0 gtk+-2.0`; then			\
-			touch $@;								\
-		else									\
-			echo >&2 "*"; 							\
-			echo >&2 "* GTK+ is present but version >= 2.0.0 is required.";	\
-			echo >&2 "*";							\
-			false;								\
-		fi									\
-	else										\
-		echo >&2 "*"; 								\
-		echo >&2 "* Unable to find the GTK+ installation. Please make sure that"; 	\
-		echo >&2 "* the GTK+ 2.0 development package is correctly installed..."; 	\
-		echo >&2 "* You need gtk+-2.0, glib-2.0 and libglade-2.0."; 		\
-		echo >&2 "*"; 								\
-		false;									\
-	fi
-endif
+$(addprefix $(obj)/, mconf.o $(lxdialog)): $(obj)/mconf-cfg
 
-# --- UNUSED, ignore ----------------------------------------------------------
-ifdef UNUSED
-$(obj)/zconf.tab.o: $(obj)/zconf.lex.c $(obj)/zconf.hash.c
+# qconf: Used for the xconfig target based on Qt
+hostprogs	+= qconf
+qconf-cxxobjs	:= qconf.o qconf-moc.o
+qconf-objs	:= images.o $(common-objs)
 
-$(obj)/qconf.o: $(obj)/qconf.moc $(obj)/lkc_defs.h
+HOSTLDLIBS_qconf	= $(shell . $(obj)/qconf-cfg && echo $$libs)
+HOSTCXXFLAGS_qconf.o	= $(shell . $(obj)/qconf-cfg && echo $$cflags)
+HOSTCXXFLAGS_qconf-moc.o = $(shell . $(obj)/qconf-cfg && echo $$cflags)
 
-$(obj)/gconf.o: $(obj)/lkc_defs.h
+$(obj)/qconf.o: $(obj)/qconf-cfg
 
-$(obj)/%.moc: $(srck)/%.h
-	$(KC_QT_MOC) -i $< -o $@
+quiet_cmd_moc = MOC     $@
+      cmd_moc = $(shell . $(obj)/qconf-cfg && echo $$moc) $< -o $@
 
-$(obj)/lkc_defs.h: $(src)/lkc_proto.h
-	sed < $< > $@ 's/P(\([^,]*\),.*/#define \1 (\*\1_p)/'
-
-# Extract gconf menu items for I18N support
-$(obj)/gconf.glade.h: $(obj)/gconf.glade
-	intltool-extract --type=gettext/glade $(obj)/gconf.glade
-endif
-# --- UNUSED, ignore ----------------------------------------------------------
+$(obj)/qconf-moc.cc: $(src)/qconf.h $(obj)/qconf-cfg FORCE
+	$(call if_changed,moc)
 
-###
-# The following requires flex/bison/gperf
-# By default we use the _shipped versions, uncomment the following line if
-# you are modifying the flex/bison src.
-# LKC_GENPARSER := 1
+targets += qconf-moc.cc
 
-ifdef LKC_GENPARSER
+# gconf: Used for the gconfig target based on GTK+
+hostprogs	+= gconf
+gconf-objs	:= gconf.o images.o $(common-objs)
 
-# --- UNUSED, ignore ----------------------------------------------------------
-$(obj)/zconf.tab.c: $(src)/zconf.y
-$(obj)/zconf.lex.c: $(src)/zconf.l
-$(obj)/zconf.hash.c: $(src)/zconf.gperf
+HOSTLDLIBS_gconf    = $(shell . $(obj)/gconf-cfg && echo $$libs)
+HOSTCFLAGS_gconf.o  = $(shell . $(obj)/gconf-cfg && echo $$cflags)
 
-%.tab.c: %.y
-	bison -t -l -b $* -p $(notdir $*) $<
+$(obj)/gconf.o: $(obj)/gconf-cfg
 
-%.tab.c_shipped: %.tab.c
-	cp $< $@
+# check if necessary packages are available, and configure build flags
+filechk_conf_cfg = $(CONFIG_SHELL) $<
 
-%.lex.c: %.l
-	flex -L -P$(notdir $*) -o$@ $<
-
-%.lex.c_shipped: %.lex.c
-	cp $< $@
-
-%.hash.c: %.gperf
-	gperf < $< > $@
-	cp $@ $@_shipped
-# --- UNUSED, ignore ----------------------------------------------------------
-
-endif
+$(obj)/%conf-cfg: $(src)/%conf-cfg.sh FORCE
+	$(call filechk,conf_cfg)
 
-$(objk)/qconf: $(patsubst %,$(objk)/%,$(qconf-cxxobjs)) \
-	       $(patsubst %,$(objk)/%,$(qconf-objs))
-	$(HOSTCXX) $(HOSTCXXFLAGS) -o $@ $^ $(HOSTLOADLIBES_qconf)
-$(objk)/gconf: $(patsubst %,$(objk)/%,$(gconf-objs))
-	$(HOSTCC) $(HOSTCFLAGS) -o $@ $^ $(HOSTLOADLIBES_gconf)
-$(objk)/mconf: $(patsubst %,$(objk)/%,$(mconf-objs))
-	$(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $^ -o $@ $(HOST_LOADLIBES)
-$(objk)/nconf: $(patsubst %,$(objk)/%,$(nconf-objs))
-	$(HOSTCC) $(HOSTCFLAGS) -o $@ $^ $(HOSTLOADLIBES_nconf)
-$(objk)/conf: $(patsubst %,$(objk)/%,$(conf-objs))
-	$(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) -o $@ $^
-
-$(objk)/mconf.o: $(srck)/mconf.c
-	$(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) -c -o $@ $<
-$(objk)/nconf.o: $(srck)/nconf.c
-	$(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) -c -o $@ $<
-$(objk)/nconf.gui.o: $(srck)/nconf.gui.c
-	$(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) -c -o $@ $<
-$(objk)/conf.o: $(srck)/conf.c
-	$(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) -c -o $@ $<
-
-$(objk)/zconf.tab.o: $(objk)/zconf.tab.c $(objk)/zconf.lex.c \
-		     $(objk)/zconf.hash.c
-	$(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) -c -o $@ $(objk)/zconf.tab.c
-$(objk)/qconf.o: $(srck)/qconf.cc $(objk)/qconf.moc $(objk)/lkc_defs.h
-	$(HOSTCXX) $(HOSTCXXFLAGS) $(HOSTCXXFLAGS_qconf.o) -c -o $@ $<
-$(objk)/gconf.o: $(srck)/gconf.c $(objk)/lkc_defs.h
-	$(HOSTCC) $(HOSTCFLAGS) $(HOSTCFLAGS_gconf.o) -c -o $@ $<
-$(objk)/%.moc: $(srck)/%.h
-	$(KC_QT_MOC) -i $< -o $@
-$(objk)/lkc_defs.h: $(srck)/lkc_proto.h
-	sed < $< > $@ 's/P(\([^,]*\),.*/#define \1 (\*\1_p)/'
-
-$(objk)/zconf.lex.c: $(srck)/zconf.lex.c_shipped
-	cp $< $@
-$(objk)/zconf.hash.c: $(srck)/zconf.hash.c_shipped
-	cp $< $@
-$(objk)/zconf.tab.c: $(srck)/zconf.tab.c_shipped
-	cp $< $@
-
-$(objk)/lxdialog/lxdialog: $(objk)/dochecklxdialog \
-			   $(patsubst %,$(objk)/lxdialog/%,$(lxdialog))
-	$(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
-		$(patsubst %,$(objk)/lxdialog/%,$(lxdialog)) $(HOST_LOADLIBES) -o $@
-$(objk)/lxdialog/%.o: $(srck)/lxdialog/%.c
-	$(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $^ -c -o $@
-
-$(objk)/%.o: HOSTCFLAGS+=-I$(srck) -I$(objk)
-$(objk)/%.o: HOSTCXXFLAGS+=-I$(srck) -I$(objk)
+clean-files += *conf-cfg