Clean up our patches against kconfig

Our kconfig-to-buildroot2.patch hasn't been kept up to date with all
the changes made into package/config, and a single patch wasn't very
practical to maintain all our changes. Therefore, this commit adds a
package/config/patches directory, which contains a Quilt series of
patches that correspond to our modifications to the kconfig mechanism.

The huge kconfig-to-buildroot2.patch has been split into 16 smaller
patches. The purpose of some of the modifications has been clearly
identified, while some others were not identified.

The 16 patches together do match exactly the old
kconfig-to-buildroot2.patch. We have been very careful in making sure
that we wouldn't loose any of our modifications.

The only modifications made are :

 * Instead of renaming the kernel Makefile to Makefile.kconfig and
   naming the Buildroot Makefile just 'Makefile', we instead keep the
   original package/config/Makefile from the kernel
   scripts/kconfig/Makefile and name the Buildroot Makefile
   package/config/Makefile.br. The main Buildroot Makefile is modified
   accordingly.

 * The documentation README.buildroot2 is updated to explain how to
   upgrade to a newer version of scripts/kconfig.

 * The kconfig-language.txt documentation is removed, as anybody can
   easily find it in the kernel sources so there's no need to
   duplicate it here.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

1 files changed, 303 insertions, 53 deletions

diff --git a/package/config/Makefile b/package/config/Makefile
index 2b266b872..f2693482e 100644
--- a/package/config/Makefile
+++ b/package/config/Makefile
@@ -1,53 +1,303 @@
-src := .
-top_srcdir=../../
-top_builddir=../../
-srctree := .
-obj ?= .
-
-include Makefile.kconfig
-#HOSTCFLAGS+=-Dinline="" -include foo.h
--include $(obj)/.depend
-$(obj)/.depend: $(wildcard *.h *.c)
-	$(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS) -MM *.c > $@ 2>/dev/null || :
-
-__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
-host-csingle := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))
-host-cmulti := $(foreach m,$(__hostprogs),\
-           $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
-host-cxxmulti := $(foreach m,$(__hostprogs),\
-           $(if $($(m)-cxxobjs),$(m),$(if $($(m)-objs),)))
-host-cobjs := $(addprefix $(obj)/,$(sort $(foreach m,$(__hostprogs),$($(m)-objs))))
-host-cxxobjs := $(addprefix $(obj)/,$(sort $(foreach m,$(__hostprogs),$($(m)-cxxobjs))))
-
-HOST_EXTRACFLAGS += -I$(obj)
-
-$(host-csingle): %: %.c
-	$(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS) $(HOSTCFLAGS_$@) $< $(HOST_LOADLIBES) -o $(obj)/$@
-
-$(host-cmulti): %: $(host-cobjs) $(host-cshlib)
-	$(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS) $(HOSTCFLAGS_$@) $(addprefix $(obj)/,$($(@F)-objs)) $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) -o $(obj)/$@
-
-$(host-cxxmulti): %: $(host-cxxobjs) $(host-cobjs) $(host-cshlib)
-	$(HOSTCXX) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS) $(HOSTCXXFLAGS_$@) $(addprefix $(obj)/,$($(@F)-objs) $($(@F)-cxxobjs)) $(HOSTLOADLIBES_$(@F)) -o $(obj)/$@
-
-$(obj)/%.o: %.c
-	$(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS) $(HOSTCFLAGS_$(@F)) -c $< -o $@
-
-$(obj)/%.o: $(obj)/%.c
-	$(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS) $(HOSTCFLAGS_$(@F)) -c $< -o $@
-
-$(obj)/%.o: %.cc
-	$(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS) $(HOSTCXXFLAGS_$(@F)) -c $< -o $@
-
-$(obj)/%:: $(src)/%_shipped
-	$(Q)cat $< > $@
-
-clean:
-	$(Q)rm -f $(addprefix $(obj)/,$(clean-files))
-distclean: clean
-	$(Q)rm -f $(addprefix $(obj)/,$(lxdialog) $(conf-objs) $(mconf-objs) $(kxgettext-objs) \
-		$(hostprogs-y) $(qconf-cxxobjs) $(qconf-objs) $(gconf-objs) \
-		mconf .depend)
-
-FORCE:
-.PHONY: FORCE clean distclean
+# ===========================================================================
+# Kernel configuration targets
+# These targets are used from top-level makefile
+
+PHONY += oldconfig xconfig gconfig menuconfig config silentoldconfig update-po-config
+
+ifdef KBUILD_KCONFIG
+Kconfig := $(KBUILD_KCONFIG)
+else
+Kconfig := arch/$(SRCARCH)/Kconfig
+endif
+
+xconfig: $(obj)/qconf
+	$< $(Kconfig)
+
+gconfig: $(obj)/gconf
+	$< $(Kconfig)
+
+menuconfig: $(obj)/mconf
+	$< $(Kconfig)
+
+config: $(obj)/conf
+	$< $(Kconfig)
+
+oldconfig: $(obj)/conf
+	$< -o $(Kconfig)
+
+silentoldconfig: $(obj)/conf
+	$< -s $(Kconfig)
+
+# Create new linux.pot file
+# Adjust charset to UTF-8 in .po file to accept UTF-8 in Kconfig files
+# The symlink is used to repair a deficiency in arch/um
+update-po-config: $(obj)/kxgettext $(obj)/gconf.glade.h
+	$(Q)echo "  GEN config"
+	$(Q)xgettext --default-domain=linux              \
+	    --add-comments --keyword=_ --keyword=N_      \
+	    --from-code=UTF-8                            \
+	    --files-from=scripts/kconfig/POTFILES.in     \
+	    --output $(obj)/config.pot
+	$(Q)sed -i s/CHARSET/UTF-8/ $(obj)/config.pot
+	$(Q)ln -fs Kconfig.i386 arch/um/Kconfig.arch
+	$(Q)(for i in `ls arch/*/Kconfig`;               \
+	    do                                           \
+		echo "  GEN $$i";                        \
+		$(obj)/kxgettext $$i                     \
+		     >> $(obj)/config.pot;               \
+	    done )
+	$(Q)msguniq --sort-by-file --to-code=UTF-8 $(obj)/config.pot \
+	    --output $(obj)/linux.pot
+	$(Q)rm -f arch/um/Kconfig.arch
+	$(Q)rm -f $(obj)/config.pot
+
+PHONY += randconfig allyesconfig allnoconfig allmodconfig defconfig
+
+randconfig: $(obj)/conf
+	$< -r $(Kconfig)
+
+allyesconfig: $(obj)/conf
+	$< -y $(Kconfig)
+
+allnoconfig: $(obj)/conf
+	$< -n $(Kconfig)
+
+allmodconfig: $(obj)/conf
+	$< -m $(Kconfig)
+
+defconfig: $(obj)/conf
+ifeq ($(KBUILD_DEFCONFIG),)
+	$< -d $(Kconfig)
+else
+	@echo "*** Default configuration is based on '$(KBUILD_DEFCONFIG)'"
+	$(Q)$< -D arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG) $(Kconfig)
+endif
+
+%_defconfig: $(obj)/conf
+	$(Q)$< -D arch/$(SRCARCH)/configs/$@ $(Kconfig)
+
+# Help text used by make help
+help:
+	@echo  '  config	  - Update current config utilising a line-oriented 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  '  oldconfig	  - Update current config utilising a provided .config as base'
+	@echo  '  silentoldconfig - Same as oldconfig, but quietly, additionally update deps'
+	@echo  '  randconfig	  - New config with random answer to all options'
+	@echo  '  defconfig	  - New config with default answer to all options'
+	@echo  '  allmodconfig	  - New config selecting modules when possible'
+	@echo  '  allyesconfig	  - New config where all options are accepted with yes'
+	@echo  '  allnoconfig	  - New config where all options are answered with no'
+
+# lxdialog stuff
+check-lxdialog  := $(srctree)/$(src)/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)
+HOST_LOADLIBES   = $(shell $(CONFIG_SHELL) $(check-lxdialog) -ldflags $(HOSTCC))
+
+HOST_EXTRACFLAGS += -DLOCALE
+
+
+# ===========================================================================
+# Shared Makefile for the various kconfig executables:
+# conf:	  Used for defconfig, oldconfig and related targets
+# 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
+
+lxdialog := lxdialog/checklist.o lxdialog/util.o lxdialog/inputbox.o
+lxdialog += lxdialog/textbox.o lxdialog/yesno.o lxdialog/menubox.o
+
+conf-objs	:= conf.o  zconf.tab.o
+mconf-objs	:= mconf.o zconf.tab.o $(lxdialog)
+kxgettext-objs	:= kxgettext.o zconf.tab.o
+
+hostprogs-y := conf qconf gconf kxgettext
+
+ifeq ($(MAKECMDGOALS),menuconfig)
+	hostprogs-y += mconf
+endif
+ifeq ($(findstring mconf,$(MAKECMDGOALS)),mconf)
+       hostprogs-y += mconf
+endif
+
+ifeq ($(MAKECMDGOALS),xconfig)
+	qconf-target := 1
+endif
+ifeq ($(findstring qconf,$(MAKECMDGOALS)),qconf)
+	qconf-target := 1
+endif
+
+ifeq ($(MAKECMDGOALS),gconfig)
+	gconf-target := 1
+endif
+ifeq ($(findstring gconf,$(MAKECMDGOALS)),gconf)
+	gconf-target := 1
+endif
+
+ifeq ($(qconf-target),1)
+qconf-cxxobjs	:= qconf.o
+qconf-objs	:= kconfig_load.o zconf.tab.o
+endif
+
+ifeq ($(gconf-target),1)
+gconf-objs	:= gconf.o kconfig_load.o zconf.tab.o
+endif
+
+clean-files := lkc_defs.h qconf.moc .tmp_qtcheck \
+               .tmp_gtkcheck zconf.tab.c lex.zconf.c zconf.hash.c gconf.glade.h
+clean-files += config.pot linux.pot
+clean-files += conf $(conf-objs)
+clean-files += mconf $(mconf-objs)
+clean-files += qconf qconf.o
+clean-files += gconf gconf.o
+clean-files += kconfig_load.o zconf.tab.o
+clean-files += $(kxgettext-objs)
+
+# Check that we have the required ncurses stuff installed for lxdialog (menuconfig)
+PHONY += $(obj)/dochecklxdialog
+$(addprefix $(obj)/,$(lxdialog)): $(obj)/dochecklxdialog
+$(obj)/dochecklxdialog:
+	$(Q)$(CONFIG_SHELL) $(check-lxdialog) -check $(HOSTCC) $(HOST_EXTRACFLAGS) $(HOST_LOADLIBES)
+
+always := dochecklxdialog
+
+# Add environment specific flags
+HOST_EXTRACFLAGS += $(shell $(CONFIG_SHELL) $(srctree)/$(src)/check.sh $(HOSTCC) $(HOSTCFLAGS))
+
+# generated files seem to need this to find local include files
+HOSTCFLAGS_lex.zconf.o	:= -I$(src)
+HOSTCFLAGS_zconf.tab.o	:= -I$(src)
+
+HOSTLOADLIBES_qconf	= $(KC_QT_LIBS) -ldl
+HOSTCXXFLAGS_qconf.o	= $(KC_QT_CFLAGS) -D LKC_DIRECT_LINK
+
+HOSTLOADLIBES_gconf	= `pkg-config --libs gtk+-2.0 gmodule-2.0 libglade-2.0` -ldl
+HOSTCFLAGS_gconf.o	= `pkg-config --cflags gtk+-2.0 gmodule-2.0 libglade-2.0` \
+                          -D LKC_DIRECT_LINK
+
+$(obj)/qconf.o: $(obj)/.tmp_qtcheck
+
+ifeq ($(qconf-target),1)
+$(obj)/.tmp_qtcheck: $(src)/Makefile
+-include $(obj)/.tmp_qtcheck
+
+# QT needs some extra effort...
+$(obj)/.tmp_qtcheck:
+	@set -e; echo "  CHECK   qt"; dir=""; pkg=""; \
+	pkg-config --exists qt 2> /dev/null && pkg=qt; \
+	pkg-config --exists qt-mt 2> /dev/null && pkg=qt-mt; \
+	if [ -n "$$pkg" ]; then \
+	  cflags="\$$(shell pkg-config $$pkg --cflags)"; \
+	  libs="\$$(shell pkg-config $$pkg --libs)"; \
+	  moc="\$$(shell pkg-config $$pkg --variable=prefix)/bin/moc"; \
+	  dir="$$(pkg-config $$pkg --variable=prefix)"; \
+	else \
+	  for d in $$QTDIR /usr/share/qt* /usr/lib/qt*; do \
+	    if [ -f $$d/include/qconfig.h ]; then dir=$$d; break; fi; \
+	  done; \
+	  if [ -z "$$dir" ]; then \
+	    echo "*"; \
+	    echo "* Unable to find the QT3 installation. Please make sure that"; \
+	    echo "* the QT3 development package is correctly installed and"; \
+	    echo "* either install pkg-config or set the QTDIR environment"; \
+	    echo "* variable to the correct location."; \
+	    echo "*"; \
+	    false; \
+	  fi; \
+	  libpath=$$dir/lib; lib=qt; osdir=""; \
+	  $(HOSTCXX) -print-multi-os-directory > /dev/null 2>&1 && \
+	    osdir=x$$($(HOSTCXX) -print-multi-os-directory); \
+	  test -d $$libpath/$$osdir && libpath=$$libpath/$$osdir; \
+	  test -f $$libpath/libqt-mt.so && lib=qt-mt; \
+	  cflags="-I$$dir/include"; \
+	  libs="-L$$libpath -Wl,-rpath,$$libpath -l$$lib"; \
+	  moc="$$dir/bin/moc"; \
+	fi; \
+	if [ ! -x $$dir/bin/moc -a -x /usr/bin/moc ]; then \
+	  echo "*"; \
+	  echo "* Unable to find $$dir/bin/moc, using /usr/bin/moc instead."; \
+	  echo "*"; \
+	  moc="/usr/bin/moc"; \
+	fi; \
+	echo "KC_QT_CFLAGS=$$cflags" > $@; \
+	echo "KC_QT_LIBS=$$libs" >> $@; \
+	echo "KC_QT_MOC=$$moc" >> $@
+endif
+
+$(obj)/gconf.o: $(obj)/.tmp_gtkcheck
+
+ifeq ($(gconf-target),1)
+-include $(obj)/.tmp_gtkcheck
+
+# GTK needs some extra effort, too...
+$(obj)/.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 $@;								\
+		else									\
+			echo "*"; 							\
+			echo "* GTK+ is present but version >= 2.0.0 is required.";	\
+			echo "*";							\
+			false;								\
+		fi									\
+	else										\
+		echo "*"; 								\
+		echo "* Unable to find the GTK+ installation. Please make sure that"; 	\
+		echo "* the GTK+ 2.0 development package is correctly installed..."; 	\
+		echo "* You need gtk+-2.0, glib-2.0 and libglade-2.0."; 		\
+		echo "*"; 								\
+		false;									\
+	fi
+endif
+
+$(obj)/zconf.tab.o: $(obj)/lex.zconf.c $(obj)/zconf.hash.c
+
+$(obj)/kconfig_load.o: $(obj)/lkc_defs.h
+
+$(obj)/qconf.o: $(obj)/qconf.moc $(obj)/lkc_defs.h
+
+$(obj)/gconf.o: $(obj)/lkc_defs.h
+
+$(obj)/%.moc: $(src)/%.h
+	$(KC_QT_MOC) -i $< -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 $(obj)/gconf.glade
+
+###
+# The following requires flex/bison/gperf
+# By default we use the _shipped versions, uncomment the following line if
+# you are modifying the flex/bison src.
+# LKC_GENPARSER := 1
+
+ifdef LKC_GENPARSER
+
+$(obj)/zconf.tab.c: $(src)/zconf.y
+$(obj)/lex.zconf.c: $(src)/zconf.l
+$(obj)/zconf.hash.c: $(src)/zconf.gperf
+
+%.tab.c: %.y
+	bison -l -b $* -p $(notdir $*) $<
+	cp $@ $@_shipped
+
+lex.%.c: %.l
+	flex -L -P$(notdir $*) -o$@ $<
+	cp $@ $@_shipped
+
+%.hash.c: %.gperf
+	gperf < $< > $@
+	cp $@ $@_shipped
+
+endif