kconfig: refactor GTK+ package checks for building gconf

Refactor the package checks for gconf in the same way as for qconf.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

scripts/kconfig/Makefile

@@ -188,8 +188,6 @@ HOST_EXTRACFLAGS += $(shell $(CONFIG_SHELL) $(check-lxdialog) -ccflags) \
 #         Utilizes ncurses
 # mconf:  Used for the menuconfig target
 #         Utilizes the lxdialog package
-# 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
@@ -199,12 +197,10 @@ conf-objs	:= conf.o  zconf.tab.o
 mconf-objs     := mconf.o zconf.tab.o $(lxdialog)
 nconf-objs     := nconf.o zconf.tab.o nconf.gui.o
 kxgettext-objs	:= kxgettext.o zconf.tab.o
-gconf-objs	:= gconf.o zconf.tab.o
 
-hostprogs-y := conf nconf mconf kxgettext gconf
+hostprogs-y := conf nconf mconf kxgettext
 
 targets		+= zconf.lex.c
-clean-files	:= .tmp_gtkcheck
 clean-files	+= gconf.glade.h
 clean-files     += config.pot linux.pot
 
@@ -224,10 +220,6 @@ HOST_EXTRACXXFLAGS += $(shell $(CONFIG_SHELL) $(srctree)/$(src)/check.sh $(HOSTC
 HOSTCFLAGS_zconf.lex.o	:= -I$(src)
 HOSTCFLAGS_zconf.tab.o	:= -I$(src)
 
-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 \
@@ -251,31 +243,14 @@ quiet_cmd_moc = MOC     $@
 $(obj)/%.moc: $(src)/%.h $(obj)/.qconf-cfg
 	$(call cmd,moc)
 
-$(obj)/gconf.o: $(obj)/.tmp_gtkcheck
-
-ifeq ($(MAKECMDGOALS),gconfig)
--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 >&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
+# gconf: Used for the gconfig target based on GTK+
+hostprogs-y	+= gconf
+gconf-objs	:= gconf.o zconf.tab.o
+
+HOSTLOADLIBES_gconf = $(shell . $(obj)/.gconf-cfg && echo $$libs)
+HOSTCFLAGS_gconf.o  = $(shell . $(obj)/.gconf-cfg && echo $$cflags)
+
+$(obj)/gconf.o: $(obj)/.gconf-cfg
 
 $(obj)/zconf.tab.o: $(obj)/zconf.lex.c
 

scripts/kconfig/gconf-cfg.sh

+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+PKG="gtk+-2.0 gmodule-2.0 libglade-2.0"
+
+if ! pkg-config --exists $PKG; then
+	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 $PKG"
+	echo >&2 "*"
+	exit 1
+fi
+
+if ! pkg-config --atleast-version=2.0.0 gtk+-2.0; then
+	echo >&2 "*"
+	echo >&2 "* GTK+ is present but version >= 2.0.0 is required."
+	echo >&2 "*"
+	exit 1
+fi
+
+echo cflags=\"$(pkg-config --cflags $PKG)\"
+echo libs=\"$(pkg-config --libs $PKG)\"