build: scripts/config - update to kconfig-v5.14

Functional Changes
---------- -------
- make 'imply' not impose any restrictions: allow symbols implied by y
  to become m
- change "modules" from sub-option to first-level attribute

Bugfixes
--------
- nconf: fix core dump when searching in empty menu
- nconf: stop endless search loops
- xconfig: fix content of the main widget
- xconfig: fix support for the split view mode

Other Changes
----- -------
- highlight xconfig 'comment' lines with '***'
- xconfig: navigate menus on hyperlinks
- xconfig: drop support for Qt4
- improve host ncurses detection

Update the 'option modules' usage to just 'modules' in Config.in.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

Config.in

@@ -5,7 +5,7 @@
 mainmenu "OpenWrt Configuration"
 
 config MODULES
-	option modules
+	modules
 	bool
 	default y
 

scripts/config/.gitignore

@@ -1,22 +1,16 @@
-#
-# Generated files
-#
-*.moc
-*conf-cfg
-mconf_check
+# SPDX-License-Identifier: GPL-2.0-only
+/conf
+/[gmnq]conf
+/[gmnq]conf-cfg
+/qconf-moc.cc
+
+# From linux kconfig parent directories
+.*
 
-#
-# configuration programs
-#
-conf
-mconf
-nconf
-qconf
-gconf
+# OpenWrt-generated files
+mconf_check
 
-#
-# temporary files from older version.  Should be removed
-#
+# Temporary files from older versions.  They should be removed after the
+# end of support for OpenWrt 19.07.
 zconf.???.c
 zconf.hash.c
-.tmp_qtcheck

scripts/config/Makefile

@@ -5,11 +5,11 @@
 .PHONY: clean all
 all: conf mconf
 clean:
-	rm -f *.o lxdialog/*.o *.moc $(clean-files) conf mconf qconf nconf
+	rm -f *.o lxdialog/*.o *.moc .*.cmd $(clean-files)
 
 # This clean-files definition is here to ensure that temporary files from the
 # previous version are removed by make config-clean.
-# It should be removed or emptied when this Makefile get updated again.
+# It should be emptied after the end of support for OpenWrt 19.07.
 clean-files	:= zconf.tab.c zconf.lex.c zconf.hash.c .tmp_qtcheck
 
 # ===========================================================================
@@ -24,9 +24,11 @@ src:=.
 obj:=.
 Q:=$(if $V,,@)
 cmd = $(cmd_$(1))
-dot-target = $(dir $@).$(notdir $@)
 
-# taken from ../Kbuild.include
+# some definitions taken from ../Kbuild.include
+dot-target = $(dir $@).$(notdir $@)
+squote  := '
+escsq = $(subst $(squote),'\$(squote)',$1)
 define filechk
 	$(Q)set -e;						\
 	mkdir -p $(dir $@);					\
@@ -37,23 +39,29 @@ define filechk
 		mv -f $(dot-target).tmp $@;			\
 	fi
 endef
+cmd-check = $(if $(strip $(cmd_$@)),,1)
+make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
+newer-prereqs = $(filter-out $(PHONY),$?)
+if_changed = $(if $(newer-prereqs)$(cmd-check),			\
+	$(cmd);							\
+	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
 
 ### Stripped down upstream Makefile follows:
 # ===========================================================================
 # object files used by all kconfig flavours
-common-objs	:= confdata.o expr.o lexer.lex.o parser.tab.o preprocess.o \
-		   symbol.o util.o
+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-y	+= conf
+hostprogs	+= conf
 conf-objs	:= conf.o $(common-objs)
 
 # nconf: Used for the nconfig target based on ncurses
-hostprogs-y	+= nconf
+hostprogs	+= nconf
 nconf-objs	:= nconf.o nconf.gui.o $(common-objs)
 
 HOSTLDLIBS_nconf	= $(shell . $(obj)/nconf-cfg && echo $$libs)
@@ -63,7 +71,7 @@ HOSTCFLAGS_nconf.gui.o	= $(shell . $(obj)/nconf-cfg && echo $$cflags)
 $(obj)/nconf.o $(obj)/nconf.gui.o: $(obj)/nconf-cfg
 
 # mconf: Used for the menuconfig target based on lxdialog
-hostprogs-y	+= mconf
+hostprogs	+= mconf
 lxdialog	:= $(addprefix lxdialog/, \
 		     checklist.o inputbox.o menubox.o textbox.o util.o yesno.o)
 mconf-objs	:= mconf.o $(lxdialog) $(common-objs)
@@ -75,20 +83,23 @@ $(foreach f, mconf.o $(lxdialog), \
 $(addprefix $(obj)/, mconf.o $(lxdialog)): $(obj)/mconf-cfg
 
 # qconf: Used for the xconfig target based on Qt
-hostprogs-y	+= qconf
-qconf-cxxobjs	:= qconf.o
+hostprogs	+= qconf
+qconf-cxxobjs	:= qconf.o qconf-moc.o
 qconf-objs	:= images.o $(common-objs)
 
 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)/qconf.o: $(obj)/qconf-cfg $(obj)/qconf.moc
+$(obj)/qconf.o: $(obj)/qconf-cfg
 
 quiet_cmd_moc = MOC     $@
-      cmd_moc = $(shell . $(obj)/qconf-cfg && echo $$moc) -i $< -o $@
+      cmd_moc = $(shell . $(obj)/qconf-cfg && echo $$moc) $< -o $@
+
+$(obj)/qconf-moc.cc: $(src)/qconf.h $(obj)/qconf-cfg FORCE
+	$(call if_changed,moc)
 
-$(obj)/%.moc: $(src)/%.h $(obj)/qconf-cfg
-	$(call cmd,moc)
+targets += qconf-moc.cc
 
 # check if necessary packages are available, and configure build flags
 filechk_conf_cfg = $(CONFIG_SHELL) $<
@@ -102,6 +113,8 @@ clean-files += *conf-cfg
 # OpenWrt rules and final adjustments that need to be made after reading the
 # full upstream Makefile
 
+clean-files += $(targets) $(hostprogs)
+
 FORCE:
 
 ifdef BUILD_SHIPPED_FILES
@@ -117,24 +130,25 @@ clean-files += $(shipped-files)
 	flex -L -o$@ $<
 endif
 
-$(foreach f, mconf.o $(lxdialog), \
-  $(eval $f: CFLAGS+=$$(HOSTCFLAGS_$f)))
+$(foreach f,$(conf-objs) $(filter-out $(common-objs),$(mconf-objs) \
+						     $(qconf-objs) \
+						     $(nconf-objs)), \
+  $(eval $(obj)/$f: CFLAGS+=$$(HOSTCFLAGS_$f)))
 
-$(obj)/lexer.lex.o: CFLAGS += $(HOSTCFLAGS_lexer.lex.o)
-$(obj)/parser.tab.o: CFLAGS += $(HOSTCFLAGS_parser.tab.o)
-$(obj)/qconf.o: CXXFLAGS+=$(HOSTCXXFLAGS_qconf.o)
+$(foreach f,$(qconf-cxxobjs), \
+  $(eval $(obj)/$f: CXXFLAGS+=$$(HOSTCXXFLAGS_$f)))
 
-conf: $(conf-objs)
+$(obj)/conf: $(addprefix $(obj)/,$(conf-objs))
 
 # The *conf-cfg file is used (then filtered out) as the first prerequisite to
 # avoid sourcing it before the script is built, when trying to compute CFLAGS
 # for the actual first prerequisite.  This avoids errors like:
 # '/bin/sh: ./mconf-cfg: No such file or directory'
-mconf: mconf-cfg $(mconf-objs)
+$(obj)/mconf: mconf-cfg $(addprefix $(obj)/,$(mconf-objs))
 	$(CC) -o $@ $(filter-out mconf-cfg,$^) $(HOSTLDLIBS_mconf)
 
-nconf: nconf-cfg $(nconf-objs)
+$(obj)/nconf: nconf-cfg $(addprefix $(obj)/,$(nconf-objs))
 	$(CC) -o $@ $(filter-out nconf-cfg,$^) $(HOSTLDLIBS_nconf)
 
-qconf: qconf-cfg $(qconf-cxxobjs) $(qconf-objs)
+$(obj)/qconf: qconf-cfg $(addprefix $(obj)/,$(qconf-cxxobjs) $(qconf-objs))
 	$(CXX) -o $@ $(filter-out qconf-cfg,$^) $(HOSTLDLIBS_qconf)

scripts/config/README

@@ -1,7 +1,6 @@
-These files were taken from the Linux Kernel Configuration System at commit
-089b7d890f972f6b649fedc9259f6b93a18fb970 (Feb 4, 2020) and modified for the
-OpenWrt Buildroot:
- - Removed gconf, tests and kernel configuration targets.
+These files were taken from the Linux 5.14 Kernel Configuration System and
+modified for the OpenWrt Buildroot:
+ - Removed nconf, gconf, tests and kernel configuration targets.
  - Adjusted the Makefile to compile outside the kernel.
  - Always use default file when running make all{no,mod,yes}config.
  - Added a 'reset' command to reset config when the target changes.
@@ -24,4 +23,4 @@ OpenWrt Buildroot:
    BUILD_SHIPPED_FILES defined
 
 For a full list of changes, see the repository at:
-https://github.com/cotequeiroz/linux/commits/openwrt/scripts/kconfig
+https://github.com/cotequeiroz/linux/commits/openwrt-5.14/scripts/kconfig