[PATCH] new kernel configuration 1/7

This adds the needed kbuild changes:
- support to compile host libraries and c++ programs
- change config calls into kconfig

Makefile

@@ -46,7 +46,9 @@ CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 TOPDIR	:= $(CURDIR)
 
 HOSTCC  	= gcc
+HOSTCXX  	= g++
 HOSTCFLAGS	= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
+HOSTCXXFLAGS	= -O2
 
 CROSS_COMPILE 	=
 
@@ -171,7 +173,8 @@ AFLAGS		:= -D__ASSEMBLY__ $(CPPFLAGS)
 
 export	VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
 	CONFIG_SHELL TOPDIR HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
-	CPP AR NM STRIP OBJCOPY OBJDUMP MAKE GENKSYMS PERL UTS_MACHINE
+	CPP AR NM STRIP OBJCOPY OBJDUMP MAKE GENKSYMS PERL UTS_MACHINE \
+	HOSTCXX HOSTCXXFLAGS
 
 export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 
@@ -247,21 +250,7 @@ ifdef include-config
 
 #	In this section, we need .config
 
-#	If .config doesn't exist - tough luck
-
-.config: arch/$(ARCH)/config.in # FIXME $(shell find . -name Config.in)
-	@echo '***'
-	@if [ -f $@ ]; then \
-	  echo '*** The tree was updated, so your .config may be'; \
-	  echo '*** out of date!'; \
-	else \
-	  echo '*** You have not yet configured your kernel!'; \
-	fi
-	@echo '***'
-	@echo '*** Please run some configurator (e.g. "make oldconfig" or'
-	@echo '*** "make menuconfig" or "make xconfig").'
-	@echo '***'
-	@exit 1
+-include ..config.cmd
 
 ifdef CONFIG_MODULES
 export EXPORT_FLAGS := -DEXPORT_SYMTAB
@@ -429,11 +418,8 @@ include/config/MARKER: scripts/split-include include/linux/autoconf.h
 # 	with it and forgot to run make oldconfig
 
 include/linux/autoconf.h: .config
-	@echo '***'
-	@echo '*** You changed .config w/o running make *config?'
-	@echo '*** Please run "make oldconfig"'
-	@echo '***'
-	@exit 1
+	+@$(call descend,scripts/kconfig,scripts/kconfig/conf)
+	./scripts/kconfig/conf -s arch/$(ARCH)/Kconfig
 
 # Generate some files
 # ---------------------------------------------------------------------------
@@ -649,34 +635,36 @@ ifeq ($(filter-out $(noconfig_targets),$(MAKECMDGOALS)),)
 .PHONY: oldconfig xconfig menuconfig config \
 	make_with_config
 
-xconfig:
-	$(Q)$(MAKE) -f scripts/Makefile.build obj=scripts scripts/kconfig.tk
-	wish -f scripts/kconfig.tk
+scripts/kconfig/conf scripts/kconfig/mconf scripts/kconfig/qconf: scripts/fixdep FORCE
+	+@$(call descend,scripts/kconfig,$@)
+
+xconfig: scripts/kconfig/qconf
+	./scripts/kconfig/qconf arch/$(ARCH)/Kconfig
 
-menuconfig:
+menuconfig: scripts/kconfig/mconf
 	$(Q)$(MAKE) -f scripts/Makefile.build obj=scripts lxdialog
-	$(CONFIG_SHELL) $(src)/scripts/Menuconfig arch/$(ARCH)/config.in
+	./scripts/kconfig/mconf arch/$(ARCH)/Kconfig
 
-config:
-	$(CONFIG_SHELL) $(src)/scripts/Configure arch/$(ARCH)/config.in
+config: scripts/kconfig/conf
+	./scripts/kconfig/conf arch/$(ARCH)/Kconfig
 
-oldconfig:
-	$(CONFIG_SHELL) $(src)/scripts/Configure -d arch/$(ARCH)/config.in
+oldconfig: scripts/kconfig/conf
+	./scripts/kconfig/conf -o arch/$(ARCH)/Kconfig
 
-randconfig:
-	$(CONFIG_SHELL) $(src)/scripts/Configure -r arch/$(ARCH)/config.in
+randconfig: scripts/kconfig/conf
+	./scripts/kconfig/conf -r arch/$(ARCH)/Kconfig
 
-allyesconfig:
-	$(CONFIG_SHELL) $(src)/scripts/Configure -y arch/$(ARCH)/config.in
+allyesconfig: scripts/kconfig/conf
+	./scripts/kconfig/conf -y arch/$(ARCH)/Kconfig
 
-allnoconfig:
-	$(CONFIG_SHELL) $(src)/scripts/Configure -n arch/$(ARCH)/config.in
+allnoconfig: scripts/kconfig/conf
+	./scripts/kconfig/conf -n arch/$(ARCH)/Kconfig
 
-allmodconfig:
-	$(CONFIG_SHELL) $(src)/scripts/Configure -m arch/$(ARCH)/config.in
+allmodconfig: scripts/kconfig/conf
+	./scripts/kconfig/conf -m arch/$(ARCH)/Kconfig
 
-defconfig:
-	yes '' | $(CONFIG_SHELL) $(src)/scripts/Configure -d arch/$(ARCH)/config.in
+defconfig: scripts/kconfig/conf
+	./scripts/kconfig/conf -d arch/$(ARCH)/Kconfig
 
 ###
 # Cleaning is done on three levels.

scripts/Makefile

@@ -11,7 +11,7 @@
 
 EXTRA_TARGETS := fixdep split-include docproc conmakehash
 
-subdir-	:= lxdialog
+subdir-	:= lxdialog kconfig
 
 # Yikes. We need to build this stuff here even if the user only wants
 # modules.

scripts/Makefile.build

@@ -171,30 +171,96 @@ targets += $(multi-used-y) $(multi-used-m)
 
 # Compile programs on the host
 # ===========================================================================
+# host-progs := bin2hex
+# Will compile bin2hex.c and create an executable named bin2hex
+#
+# host-progs    := lxdialog
+# lxdialog-objs := checklist.o lxdialog.o
+# Will compile lxdialog.c and checklist.c, and then link the executable
+# lxdialog, based on checklist.o and lxdialog.o
+#
+# host-progs      := qconf
+# qconf-cxxobjs   := qconf.o
+# qconf-objs      := menu.o
+# Will compile qconf as a C++ program, and menu as a C program.
+# They are linked as C++ code to the executable qconf
+
+# host-progs := conf
+# conf-objs  := conf.o libkconfig.so
+# libkconfig-objs := expr.o type.o
+# Will create a shared library named libkconfig.so that consist of
+# expr.o and type.o (they are both compiled as C code and the object file
+# are made as position independent code).
+# conf.c is compiled as a c program, and conf.o is linked together with
+# libkconfig.so as the executable conf.
+# Note: Shared libraries consisting of C++ files are not supported  
+#
 
-quiet_cmd_host_cc__c  = HOSTCC  $@
-cmd_host_cc__c        = $(HOSTCC) -Wp,-MD,$(depfile) \
+# Create executable from a single .c file
+# host-csingle -> Executable
+quiet_cmd_host-csingle 	= HOSTCC  $@
+      cmd_host-csingle	= $(HOSTCC) -Wp,-MD,$(depfile) \
 			  $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
 			  $(HOST_LOADLIBES) -o $@ $<
-
-$(host-progs-single): %: %.c FORCE
-	$(call if_changed_dep,host_cc__c)
-
-quiet_cmd_host_cc_o_c = HOSTCC  $@
-cmd_host_cc_o_c       = $(HOSTCC) -Wp,-MD,$(depfile) \
-			$(HOSTCFLAGS) $(HOST_EXTRACFLAGS) -c -o $@ $<
-
-$(host-progs-multi-objs): %.o: %.c FORCE
-	$(call if_changed_dep,host_cc_o_c)
-
-quiet_cmd_host_cc__o  = HOSTLD  $@
-cmd_host_cc__o        = $(HOSTCC) $(HOSTLDFLAGS) -o $@ $(addprefix $(obj)/,$($(subst $(obj)/,,$@)-objs)) \
-			$(HOST_LOADLIBES)
-
-$(host-progs-multi): %: $(host-progs-multi-objs) FORCE
-	$(call if_changed,host_cc__o)
-
-targets += $(host-progs-single) $(host-progs-multi-objs) $(host-progs-multi) 
+$(host-csingle): %: %.c FORCE
+	$(call if_changed_dep,host-csingle)
+
+# Link an executable based on list of .o files, all plain c
+# host-cmulti -> executable
+quiet_cmd_host-cmulti	= HOSTLD  $@
+      cmd_host-cmulti	= $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
+			  $(addprefix $(obj)/,$($(@F)-objs)) \
+			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+$(host-cmulti): %: $(host-cobjs) $(host-cshlib) FORCE
+	$(call if_changed,host-cmulti)
+
+# Create .o file from a single .c file
+# host-cobjs -> .o
+quiet_cmd_host-cobjs	= HOSTCC  $@
+      cmd_host-cobjs	= $(HOSTCC) -Wp,-MD,$(depfile) \
+			  $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
+			  $(HOSTCFLAGS_$(@F)) -c -o $@ $<
+$(host-cobjs): %.o: %.c FORCE
+	$(call if_changed_dep,host-cobjs)
+
+# Link an executable based on list of .o files, a mixture of .c and .cc
+# host-cxxmulti -> executable
+quiet_cmd_host-cxxmulti	= HOSTLD  $@
+      cmd_host-cxxmulti	= $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
+			  $(foreach o,objs cxxobjs,\
+			  $(addprefix $(obj)/,$($(@F)-$(o)))) \
+			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+$(host-cxxmulti): %: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE
+	$(call if_changed,host-cxxmulti)
+
+# Create .o file from a single .cc (C++) file
+quiet_cmd_host-cxxobjs	= HOSTCXX $@
+      cmd_host-cxxobjs	= $(HOSTCXX) -Wp,-MD,$(depfile) \
+			  $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
+			  $(HOSTCXXFLAGS_$(@F)) -c -o $@ $<
+$(host-cxxobjs): %.o: %.cc FORCE
+	$(call if_changed_dep,host-cxxobjs)
+
+# Compile .c file, create position independent .o file
+# host-cshobjs -> .o
+quiet_cmd_host-cshobjs	= HOSTCC  -fPIC $@
+      cmd_host-cshobjs	= $(HOSTCC) -Wp,-MD,$(depfile) -fPIC\
+			  $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
+			  $(HOSTCFLAGS_$(@F)) -c -o $@ $<
+$(host-cshobjs): %.o: %.c FORCE
+	$(call if_changed_dep,host-cshobjs)
+
+# Link a shared library, based on position independent .o files
+# *.o -> .so shared library (host-cshlib)
+quiet_cmd_host-cshlib	= HOSTLLD -shared $@
+      cmd_host-cshlib	= $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
+			  $(addprefix $(obj)/,$($(@F:.so=-objs))) \
+			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+$(host-cshlib): %: $(host-cshobjs) FORCE
+	$(call if_changed,host-cshlib)
+
+targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
+	   $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) 
 
 # Descending
 # ---------------------------------------------------------------------------

scripts/Makefile.lib

@@ -57,9 +57,33 @@ real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)
 # Only build module versions for files which are selected to be built
 export-objs := $(filter $(export-objs),$(real-objs-y) $(real-objs-m))
 
-host-progs-single     := $(foreach m,$(host-progs),$(if $($(m)-objs),,$(m)))
-host-progs-multi      := $(foreach m,$(host-progs),$(if $($(m)-objs),$(m)))
-host-progs-multi-objs := $(foreach m,$(host-progs-multi),$($(m)-objs))
+# C code
+# Executables compiled from a single .c file
+host-csingle	:= $(foreach m,$(host-progs),$(if $($(m)-objs),,$(m)))
+
+# C executables linked based on several .o files
+host-cmulti	:= $(foreach m,$(host-progs),\
+		   $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
+
+# Object (.o) files compiled from .c files
+host-cobjs	:= $(sort $(foreach m,$(host-progs),$($(m)-objs)))
+
+# C++ code
+# C++ executables compiled from at least on .cc file
+# and zero or more .c files
+host-cxxmulti	:= $(foreach m,$(host-progs),$(if $($(m)-cxxobjs),$(m)))
+
+# C++ Object (.o) files compiled from .cc files
+host-cxxobjs	:= $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
+
+# Shared libaries (only .c supported)
+# Shared libraries (.so) - all .so files referenced in "xxx-objs"
+host-cshlib	:= $(sort $(filter %.so, $(host-cobjs)))
+# Remove .so files from "xxx-objs"
+host-cobjs	:= $(filter-out %.so,$(host-cobjs))
+
+#Object (.o) files used by the shared libaries
+host-cshobjs	:= $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
 
 # Add subdir path
 
@@ -76,9 +100,13 @@ multi-objs-y	:= $(addprefix $(obj)/,$(multi-objs-y))
 multi-objs-m	:= $(addprefix $(obj)/,$(multi-objs-m))
 subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym))
 host-progs      := $(addprefix $(obj)/,$(host-progs))
-host-progs-single     := $(addprefix $(obj)/,$(host-progs-single))
-host-progs-multi      := $(addprefix $(obj)/,$(host-progs-multi))
-host-progs-multi-objs := $(addprefix $(obj)/,$(host-progs-multi-objs))
+host-csingle	:= $(addprefix $(obj)/,$(host-csingle))
+host-cmulti	:= $(addprefix $(obj)/,$(host-cmulti))
+host-cobjs	:= $(addprefix $(obj)/,$(host-cobjs))
+host-cxxmulti	:= $(addprefix $(obj)/,$(host-cxxmulti))
+host-cxxobjs	:= $(addprefix $(obj)/,$(host-cxxobjs))
+host-cshlib	:= $(addprefix $(obj)/,$(host-cshlib))
+host-cshobjs	:= $(addprefix $(obj)/,$(host-cshobjs))
 
 # The temporary file to save gcc -MD generated dependencies must not
 # contain a comma