build system overhaul

1 files changed, 1190 insertions, 430 deletions

diff --git a/Makefile b/Makefile
index 83da80c..4b49208 100644
--- a/Makefile
+++ b/Makefile
@@ -1,521 +1,1281 @@
-# Makefile for busybox
+VERSION = 1
+PATCHLEVEL = 2
+SUBLEVEL = 1
+EXTRAVERSION = .svn
+NAME=Unnamed
+
+# *DOCUMENTATION*
+# To see a list of typical targets execute "make help"
+# More info can be located in ./README
+# Comments in this file are targeted only to the developer, do not
+# expect to learn how to build the kernel reading this file.
+
+# Do not print "Entering directory ..."
+MAKEFLAGS += --no-print-directory
+
+# We are using a recursive build, so we need to do a little thinking
+# to get the ordering right.
 #
-# Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
-#
-# Licensed under GPLv2, see the file LICENSE in this tarball for details.
+# Most importantly: sub-Makefiles should only ever modify files in
+# their own directory. If in some directory we have a dependency on
+# a file in another dir (which doesn't happen often, but it's often
+# unavoidable when linking the built-in.o targets which finally
+# turn into busybox), we will call a sub make in that other dir, and
+# after that we are sure that everything which is in that other dir
+# is now up to date.
 #
+# The only cases where we need to modify files which have global
+# effects are thus separated out and done before the recursive
+# descending is started. They are now explicitly listed as the
+# prepare rule.
 
-# You shouldn't have to edit anything in this file for configuration
-# purposes, try "make help" or read http://busybox.net/FAQ.html.
+# To put more focus on warnings, be less verbose as default
+# Use 'make V=1' to see the full commands
 
-.PHONY: dummy subdirs release distclean clean config oldconfig menuconfig \
-        tags check test depend dep buildtree hosttools _all checkhelp \
-        sizes bloatcheck baseline objsizes
+ifdef V
+  ifeq ("$(origin V)", "command line")
+    KBUILD_VERBOSE = $(V)
+  endif
+endif
+ifndef KBUILD_VERBOSE
+  KBUILD_VERBOSE = 0
+endif
 
-noconfig_targets := menuconfig config oldconfig randconfig hosttools \
-	defconfig allyesconfig allnoconfig allbareconfig \
-	clean distclean help \
-	release tags
+# Call sparse as part of compilation of C files
+# Use 'make C=1' to enable sparse checking
 
-nocheck_targets := clean distclean help release tags
+ifdef C
+  ifeq ("$(origin C)", "command line")
+    KBUILD_CHECKSRC = $(C)
+  endif
+endif
+ifndef KBUILD_CHECKSRC
+  KBUILD_CHECKSRC = 0
+endif
 
-# the toplevel sourcedir
-ifndef top_srcdir
-top_srcdir=$(CURDIR)
+# Use make M=dir to specify directory of external module to build
+# Old syntax make ... SUBDIRS=$PWD is still supported
+# Setting the environment variable KBUILD_EXTMOD take precedence
+ifdef SUBDIRS
+  KBUILD_EXTMOD ?= $(SUBDIRS)
 endif
-# toplevel directory of the object-tree
-ifndef top_builddir
-top_builddir=$(CURDIR)
+ifdef M
+  ifeq ("$(origin M)", "command line")
+    KBUILD_EXTMOD := $(M)
+  endif
 endif
 
-export srctree=$(top_srcdir)
-vpath %/Config.in $(srctree)
 
-DIRS:=applets archival archival/libunarchive coreutils console-tools \
-	debianutils editors findutils init miscutils modutils networking \
-	networking/libiproute networking/udhcp procps loginutils shell \
-	sysklogd util-linux e2fsprogs libpwdgrp coreutils/libcoreutils \
-	runit libbb
+# kbuild supports saving output files in a separate directory.
+# To locate output files in a separate directory two syntaxes are supported.
+# In both cases the working directory must be the root of the kernel src.
+# 1) O=
+# Use "make O=dir/to/store/output/files/"
+# 
+# 2) Set KBUILD_OUTPUT
+# Set the environment variable KBUILD_OUTPUT to point to the directory
+# where the output files shall be placed.
+# export KBUILD_OUTPUT=dir/to/store/output/files/
+# make
+#
+# The O= assignment takes precedence over the KBUILD_OUTPUT environment
+# variable.
 
-SRC_DIRS:=$(patsubst %,$(top_srcdir)/%,$(DIRS))
 
-# That's our default target when none is given on the command line
-_all:
-
-CONFIG_CONFIG_IN = $(top_srcdir)/Config.in
+# KBUILD_SRC is set on invocation of make in OBJ directory
+# KBUILD_SRC is not intended to be used by the regular user (for now)
+ifeq ($(KBUILD_SRC),)
 
-ifeq ($(BUILD_SRC),)
+# OK, Make called in directory where kernel src resides
+# Do we want to locate output files in a separate directory?
 ifdef O
   ifeq ("$(origin O)", "command line")
-    BUILD_OUTPUT := $(O)
-    top_builddir := $(O)
+    KBUILD_OUTPUT := $(O)
   endif
+endif
+
+# That's our default target when none is given on the command line
+PHONY := _all
+_all:
+
+ifneq ($(KBUILD_OUTPUT),)
+# Invoke a second make in the output directory, passing relevant variables
+# check that the output directory actually exists
+saved-output := $(KBUILD_OUTPUT)
+KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
+$(if $(KBUILD_OUTPUT),, \
+     $(error output directory "$(saved-output)" does not exist))
+
+PHONY += $(MAKECMDGOALS)
+
+$(filter-out _all,$(MAKECMDGOALS)) _all:
+	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
+	KBUILD_SRC=$(CURDIR) \
+	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
+
+# Leave processing to above invocation of make
+skip-makefile := 1
+endif # ifneq ($(KBUILD_OUTPUT),)
+endif # ifeq ($(KBUILD_SRC),)
+
+# We process the rest of the Makefile if this is the final invocation of make
+ifeq ($(skip-makefile),)
+
+# If building an external module we do not care about the all: rule
+# but instead _all depend on modules
+PHONY += all
+ifeq ($(KBUILD_EXTMOD),)
+_all: all
 else
-# If no alternate output-dir was specified, we build in cwd
-# We are using BUILD_OUTPUT nevertheless to make sure that we create
-# Rules.mak and the toplevel Makefile, in case they don't exist.
-  BUILD_OUTPUT := $(top_builddir)
+_all: modules
 endif
 
-# see if we are in verbose mode
-BUILD_VERBOSE :=
-ifdef V
-  ifeq ("$(origin V)", "command line")
-    BUILD_VERBOSE := $(V)
-  endif
+srctree		:= $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
+TOPDIR		:= $(srctree)
+# FIXME - TOPDIR is obsolete, use srctree/objtree
+objtree		:= $(CURDIR)
+src		:= $(srctree)
+obj		:= $(objtree)
+
+VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
+
+export srctree objtree VPATH TOPDIR
+
+
+# SUBARCH tells the usermode build what the underlying arch is.  That is set
+# first, and if a usermode build is happening, the "ARCH=um" on the command
+# line overrides the setting of ARCH below.  If a native build is happening,
+# then ARCH is assigned, getting whatever value it gets normally, and 
+# SUBARCH is subsequently ignored.
+
+SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
+				  -e s/arm.*/arm/ -e s/sa110/arm/ \
+				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
+				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
+
+# Cross compiling and selecting different set of gcc/bin-utils
+# ---------------------------------------------------------------------------
+#
+# When performing cross compilation for other architectures ARCH shall be set
+# to the target architecture. (See arch/* for the possibilities).
+# ARCH can be set during invocation of make:
+# make ARCH=ia64
+# Another way is to have ARCH set in the environment.
+# The default ARCH is the host where make is executed.
+
+# CROSS_COMPILE specify the prefix used for all executables used
+# during compilation. Only gcc and related bin-utils executables
+# are prefixed with $(CROSS_COMPILE).
+# CROSS_COMPILE can be set on the command line
+# make CROSS_COMPILE=ia64-linux-
+# Alternatively CROSS_COMPILE can be set in the environment.
+# Default value for CROSS_COMPILE is not to prefix executables
+# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
+
+ARCH		?= $(SUBARCH)
+CROSS_COMPILE	?=
+
+# Architecture as present in compile.h
+UTS_MACHINE := $(ARCH)
+
+# SHELL used by kbuild
+CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
+	  else if [ -x /bin/bash ]; then echo /bin/bash; \
+	  else echo sh; fi ; fi)
+
+HOSTCC  	= gcc
+HOSTCXX  	= g++
+HOSTCFLAGS	= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
+HOSTCXXFLAGS	= -O2
+
+# 	Decide whether to build built-in, modular, or both.
+#	Normally, just do built-in.
+
+KBUILD_MODULES :=
+KBUILD_BUILTIN := 1
+
+#	If we have only "make modules", don't compile built-in objects.
+#	When we're building modules with modversions, we need to consider
+#	the built-in objects during the descend as well, in order to
+#	make sure the checksums are uptodate before we record them.
+
+ifeq ($(MAKECMDGOALS),modules)
+  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 endif
-ifdef VERBOSE
-  ifeq ("$(origin VERBOSE)", "command line")
-    BUILD_VERBOSE := $(VERBOSE)
-  endif
+
+#	If we have "make <whatever> modules", compile modules
+#	in addition to whatever we do anyway.
+#	Just "make" or "make all" shall build modules as well
+
+ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
+  KBUILD_MODULES := 1
+endif
+
+ifeq ($(MAKECMDGOALS),)
+  KBUILD_MODULES := 1
 endif
 
-ifneq ($(strip $(BUILD_VERBOSE)),)
-  export BUILD_VERBOSE
-  CHECK_VERBOSE := -v
-# ARFLAGS+=v
+export KBUILD_MODULES KBUILD_BUILTIN
+export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
+
+# Beautify output
+# ---------------------------------------------------------------------------
+#
+# Normally, we echo the whole command before executing it. By making
+# that echo $($(quiet)$(cmd)), we now have the possibility to set
+# $(quiet) to choose other forms of output instead, e.g.
+#
+#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
+#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
+#
+# If $(quiet) is empty, the whole command will be printed.
+# If it is set to "quiet_", only the short version will be printed. 
+# If it is set to "silent_", nothing wil be printed at all, since
+# the variable $(silent_cmd_cc_o_c) doesn't exist.
+#
+# A simple variant is to prefix commands with $(Q) - that's useful
+# for commands that shall be hidden in non-verbose mode.
+#
+#	$(Q)ln $@ :<
+#
+# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
+# If KBUILD_VERBOSE equals 1 then the above command is displayed.
+
+ifeq ($(KBUILD_VERBOSE),1)
+  quiet =
+  Q =
+else
+  quiet=quiet_
+  Q = @
 endif
 
-ifneq ($(strip $(HAVE_DOT_CONFIG)),y)
-# pull in settings early
--include $(top_srcdir)/Rules.mak
+# If the user is running make -s (silent mode), suppress echoing of
+# commands
+
+ifneq ($(findstring s,$(MAKEFLAGS)),)
+  quiet=silent_
 endif
 
-# All object directories.
-OBJ_DIRS := $(DIRS)
-all_tree := $(patsubst %,$(top_builddir)/%,$(OBJ_DIRS) scripts scripts/config include)
-all_tree: $(all_tree)
-$(all_tree):
-	@mkdir -p "$@"
+export quiet Q KBUILD_VERBOSE
+
+
+# Look for make include files relative to root of kernel src
+MAKEFLAGS += --include-dir=$(srctree)
+
+# We need some generic definitions
+include  $(srctree)/scripts/Kbuild.include
+
+# For maximum performance (+ possibly random breakage, uncomment
+# the following)
+
+MAKEFLAGS += -rR
+
+# Make variables (CC, etc...)
+
+AS		= $(CROSS_COMPILE)as
+LD		= $(CROSS_COMPILE)ld
+CC		= $(CROSS_COMPILE)gcc
+CPP		= $(CC) -E
+AR		= $(CROSS_COMPILE)ar
+NM		= $(CROSS_COMPILE)nm
+STRIP		= $(CROSS_COMPILE)strip
+OBJCOPY		= $(CROSS_COMPILE)objcopy
+OBJDUMP		= $(CROSS_COMPILE)objdump
+AWK		= awk
+GENKSYMS	= scripts/genksyms/genksyms
+DEPMOD		= /sbin/depmod
+KALLSYMS	= scripts/kallsyms
+PERL		= perl
+CHECK		= sparse
+
+CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
+MODFLAGS	= -DMODULE
+CFLAGS_MODULE   = $(MODFLAGS)
+AFLAGS_MODULE   = $(MODFLAGS)
+LDFLAGS_MODULE  = -r
+CFLAGS_KERNEL	=
+AFLAGS_KERNEL	=
+
+
+# Use LINUXINCLUDE when you must reference the include/ directory.
+# Needed to be compatible with the O= option
+CFLAGS		:=
+CPPFLAGS	:=
+AFLAGS		:=
+include $(srctree)/Makefile.flags
+
+# Read KERNELRELEASE from .kernelrelease (if it exists)
+KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
+KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
+
+export	VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
+	ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
+	CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
+	HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
+
+export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
+export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 
+export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
+
+# When compiling out-of-tree modules, put MODVERDIR in the module
+# tree rather than in the kernel tree. The kernel tree might
+# even be read-only.
+export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
+
+# Files to ignore in find ... statements
+
+RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
+export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
+
+# ===========================================================================
+# Rules shared between *config targets and build targets
+
+# Basic helpers built in scripts/
+PHONY += scripts_basic
+scripts_basic:
+	$(Q)$(MAKE) $(build)=scripts/basic
+
+# To avoid any implicit rule to kick in, define an empty command.
+scripts/basic/%: scripts_basic ;
+
+PHONY += outputmakefile
+# outputmakefile generates a Makefile in the output directory, if using a
+# separate output directory. This allows convenient use of make in the
+# output directory.
+outputmakefile:
+ifneq ($(KBUILD_SRC),)
+	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
+	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
+endif
 
-ifneq ($(BUILD_OUTPUT),)
-# Invoke a second make in the output directory, passing relevant variables
-# Check that the output directory actually exists
-saved-output := $(BUILD_OUTPUT)
-BUILD_OUTPUT := $(shell cd $(BUILD_OUTPUT) && /bin/pwd)
-$(if $(wildcard $(BUILD_OUTPUT)),, \
-     $(error output directory "$(saved-output)" does not exist))
+# To make sure we do not include .config for any of the *config targets
+# catch them early, and hand them over to scripts/kconfig/Makefile
+# It is allowed to specify more targets when calling make, including
+# mixing *config targets and build targets.
+# For example 'make oldconfig all'. 
+# Detect when mixed targets is specified, and make a second invocation
+# of make so .config is not included in this case either (for *config).
+
+no-dot-config-targets := clean mrproper distclean \
+			 cscope TAGS tags help %docs check%
+
+config-targets := 0
+mixed-targets  := 0
+dot-config     := 1
+
+ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
+	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
+		dot-config := 0
+	endif
+endif
 
-.PHONY: $(MAKECMDGOALS)
+ifeq ($(KBUILD_EXTMOD),)
+        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
+                config-targets := 1
+                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
+                        mixed-targets := 1
+                endif
+        endif
+endif
 
-$(filter-out _all,$(MAKECMDGOALS)) _all: $(BUILD_OUTPUT)/Rules.mak $(BUILD_OUTPUT)/Makefile all_tree
-	$(Q)$(MAKE) -C $(BUILD_OUTPUT) \
-	top_srcdir=$(top_srcdir) \
-	top_builddir=$(top_builddir) \
-	BUILD_SRC=$(top_srcdir) \
-	-f $(CURDIR)/Makefile $@
+ifeq ($(mixed-targets),1)
+# ===========================================================================
+# We're called with mixed targets (*config and build targets).
+# Handle them one by one.
 
-$(BUILD_OUTPUT)/Rules.mak:
-	@echo > $@
-	@echo top_srcdir=$(top_srcdir) >> $@
-	@echo top_builddir=$(BUILD_OUTPUT) >> $@
-	@echo include $(top_srcdir)/Rules.mak >> $@
+%:: FORCE
+	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 
-$(BUILD_OUTPUT)/Makefile:
-	@echo > $@
-	@echo top_srcdir=$(top_srcdir) >> $@
-	@echo top_builddir=$(BUILD_OUTPUT) >> $@
-	@echo BUILD_SRC='$$(top_srcdir)' >> $@
-	@echo include '$$(BUILD_SRC)'/Makefile >> $@
+else
+ifeq ($(config-targets),1)
+# ===========================================================================
+# *config targets only - make sure prerequisites are updated, and descend
+# in scripts/kconfig to make the *config target
+
+# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
+# KBUILD_DEFCONFIG may point out an alternative default configuration
+# used for 'make defconfig'
+-include $(srctree)/arch/$(ARCH)/Makefile
+export KBUILD_DEFCONFIG
+
+config %config: scripts_basic outputmakefile FORCE
+	$(Q)mkdir -p include/linux
+	$(Q)$(MAKE) $(build)=scripts/kconfig $@
+	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
 
-# Leave processing to above invocation of make
-skip-makefile := 1
-endif # ifneq ($(BUILD_OUTPUT),)
-endif # ifeq ($(BUILD_SRC),)
+else
+# ===========================================================================
+# Build targets only - this includes busybox, arch specific targets, clean
+# targets and others. In general all targets except *config targets.
+
+ifeq ($(KBUILD_EXTMOD),)
+# Additional helpers built in scripts/
+# Carefully list dependencies so we do not try to build scripts twice
+# in parrallel
+PHONY += scripts
+scripts: scripts_basic include/config/MARKER
+	$(Q)$(MAKE) $(build)=$(@)
+
+scripts_basic: include/autoconf.h
+
+# Objects we will link into busybox / subdirs we need to visit
+core-y		:= \
+		applets/ \
+
+libs-y		:= \
+		archival/ \
+		archival/libunarchive/ \
+		console-tools/ \
+		coreutils/ \
+		coreutils/libcoreutils/ \
+		debianutils/ \
+		e2fsprogs/ \
+		e2fsprogs/blkid/ \
+		e2fsprogs/e2p/ \
+		e2fsprogs/ext2fs/ \
+		e2fsprogs/uuid/ \
+		editors/ \
+		findutils/ \
+		init/ \
+		libbb/ \
+		libpwdgrp/ \
+		loginutils/ \
+		miscutils/ \
+		modutils/ \
+		networking/ \
+		networking/libiproute/ \
+		networking/udhcp/ \
+		procps/ \
+		runit/ \
+		shell/ \
+		sysklogd/ \
+		util-linux/ \
+
+endif # KBUILD_EXTMOD
+
+ifeq ($(dot-config),1)
+# In this section, we need .config
 
-ifeq ($(skip-makefile),)
+# Read in dependencies to all Kconfig* files, make sure to run
+# oldconfig if changes are detected.
+-include .kconfig.d
 
-# We only need a copy of the Makefile for the config targets and reuse
-# the rest from the source directory, i.e. we do not cp ALL_MAKEFILES.
-scripts/config/Makefile: $(top_srcdir)/scripts/config/Makefile
-	cp $< $@
+include .config
 
-_all: all
+# If .config needs to be updated, it will be done via the dependency
+# that autoconf has on .config.
+# To avoid any implicit rule to kick in, define an empty command
+.config .kconfig.d: ;
 
-help:
-	@echo 'Cleaning:'
-	@echo '  clean			- delete temporary files created by build'
-	@echo '  distclean		- delete all non-source files (including .config)'
-	@echo
-	@echo 'Build:'
-	@echo '  all			- Executable and documentation'
-	@echo '  busybox		- the swiss-army executable'
-	@echo '  doc			- docs/BusyBox.{txt,html,1}'
-	@echo '  html			- create html-based cross-reference'
-	@echo
-	@echo 'Configuration:'
-	@echo '  allnoconfig		- disable all symbols in .config'
-	@echo '  allyesconfig		- enable all symbols in .config (see defconfig)'
-	@echo '  allbareconfig		- enable all applets without any sub-features'
-	@echo '  config		- text based configurator (of last resort)'
-	@echo '  defconfig		- set .config to largest generic configuration'
-	@echo '  menuconfig		- interactive curses-based configurator'
-	@echo '  oldconfig		- resolve any unresolved symbols in .config'
-	@echo '  hosttools  		- build sed for the host.'
-	@echo '  			  You can use these commands if the commands on the host'
-	@echo '  			  is unusable. Afterwards use it like:'
-	@echo '			  make SED="$(top_builddir)/sed"'
-	@echo
-	@echo 'Installation:'
-	@echo '  install		- install busybox into $(PREFIX)'
-	@echo '  uninstall'
-	@echo
-	@echo 'Development:'
-	@echo '  baseline		- create busybox_old for bloatcheck.'
-	@echo '  bloatcheck		- show size difference between old and new versions'
-	@echo '  check			- run the test suite for all applets'
-	@echo '  checkhelp		- check for missing help-entries in Config.in'
-	@echo '  randconfig		- generate a random configuration'
-	@echo '  release		- create a distribution tarball'
-	@echo '  sizes			- show size of all enabled busybox symbols'
-	@echo '  objsizes		- show size of each .o object built'
-	@echo
+# If .config is newer than include/autoconf.h, someone tinkered
+# with it and forgot to run make oldconfig.
+# If kconfig.d is missing then we are probarly in a cleaned tree so
+# we execute the config step to be sure to catch updated Kconfig files
+include/autoconf.h: .kconfig.d .config
+	$(Q)mkdir -p include/linux
+	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 
+else
+# Dummy target needed, because used as prerequisite
+include/autoconf.h: ;
+endif
 
-include $(top_srcdir)/Rules.mak
+# The all: target is the default when no target is given on the
+# command line.
+# This allow a user to issue only 'make' to build a kernel including modules
+# Defaults busybox but it is usually overriden in the arch makefile
+all: busybox
 
-ifneq ($(strip $(HAVE_DOT_CONFIG)),y)
+-include $(srctree)/arch/$(ARCH)/Makefile
 
-# Default target if none was requested explicitly
-all: menuconfig
+# arch Makefile may override CC so keep this after arch Makefile is included
+#bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
+CHECKFLAGS += $(NOSTDINC_FLAGS)
 
-# warn if no configuration exists and we are asked to build a non-config target
-.config:
-	@echo ""
-	@echo "No $(top_builddir)/$@ found!"
-	@echo "Please refer to 'make  help', section Configuration."
-	@echo ""
-	@exit 1
+# warn about C99 declaration after statement
+CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
+
+# disable pointer signedness warnings in gcc 4.0
+CFLAGS += $(call cc-option,-Wno-pointer-sign,)
+
+# Default kernel image to build when no specific target is given.
+# KBUILD_IMAGE may be overruled on the commandline or
+# set in the environment
+# Also any assignments in arch/$(ARCH)/Makefile take precedence over
+# this default value
+export KBUILD_IMAGE ?= busybox
+
+#
+# INSTALL_PATH specifies where to place the updated kernel and system map
+# images. Default is /boot, but you can set it to other values
+export	INSTALL_PATH ?= /boot
+
+#
+# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
+# relocations required by build roots.  This is not defined in the
+# makefile but the arguement can be passed to make if needed.
+#
+
+MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
+export MODLIB
+
+
+ifeq ($(KBUILD_EXTMOD),)
+busybox-dirs	:= $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
+
+busybox-alldirs	:= $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
+		     $(core-n) $(core-) $(libs-n) $(libs-) \
+		)))
+
+core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
+libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
+libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
+libs-y		:= $(libs-y1) $(libs-y2)
 
-# configuration
+
+# Build busybox
 # ---------------------------------------------------------------------------
+# busybox is build from the objects selected by $(busybox-init) and
+# $(busybox-main). Most are built-in.o files from top-level directories
+# in the kernel tree, others are specified in arch/$(ARCH)Makefile.
+# Ordering when linking is important, and $(busybox-init) must be first.
+#
+# busybox
+#   ^
+#   |
+#   +-< $(busybox-init)
+#   |   +--< init/version.o + more
+#   |
+#   +--< $(busybox-main)
+#   |    +--< driver/built-in.o mm/built-in.o + more
+#   |
+#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
+#
+# busybox version (uname -v) cannot be updated during normal
+# descending-into-subdirs phase since we do not yet know if we need to
+# update busybox.
+# Therefore this step is delayed until just before final link of busybox -
+# except in the kallsyms case where it is done just before adding the
+# symbols to the kernel.
+#
+# System.map is generated to document addresses of all kernel symbols
+
+busybox-all  := $(core-y) $(libs-y)
+
+# Rule to link busybox - also used during CONFIG_KALLSYMS
+# May be overridden by arch/$(ARCH)/Makefile
+quiet_cmd_busybox__ ?= LINK    $@
+      cmd_busybox__ ?= scripts/trylink $(CC) -o $@ \
+      -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
+      -Wl,--start-group $(busybox-all) -Wl,--end-group \
+
+# Generate System.map
+quiet_cmd_sysmap = SYSMAP 
+      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
+
+# Link of busybox
+# If CONFIG_KALLSYMS is set .version is already updated
+# Generate System.map and verify that the content is consistent
+# Use + in front of the busybox_version rule to silent warning with make -j2
+# First command is ':' to allow us to use + in front of the rule
+define rule_busybox__
+	:
+	$(call cmd,busybox__)
+	$(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
+endef
+
+
+ifdef CONFIG_KALLSYMS
+# Generate section listing all symbols and add it into busybox $(kallsyms.o)
+# It's a three stage process:
+# o .tmp_busybox1 has all symbols and sections, but __kallsyms is
+#   empty
+#   Running kallsyms on that gives us .tmp_kallsyms1.o with
+#   the right size - busybox version (uname -v) is updated during this step
+# o .tmp_busybox2 now has a __kallsyms section of the right size,
+#   but due to the added section, some addresses have shifted.
+#   From here, we generate a correct .tmp_kallsyms2.o
+# o The correct .tmp_kallsyms2.o is linked into the final busybox.
+# o Verify that the System.map from busybox matches the map from
+#   .tmp_busybox2, just in case we did not generate kallsyms correctly.
+# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
+#   .tmp_busybox3 and .tmp_kallsyms3.o.  This is only meant as a
+#   temporary bypass to allow the kernel to be built while the
+#   maintainers work out what went wrong with kallsyms.
+
+ifdef CONFIG_KALLSYMS_EXTRA_PASS
+last_kallsyms := 3
+else
+last_kallsyms := 2
+endif
 
-scripts/config/conf: scripts/config/Makefile
-	$(Q)$(MAKE) -C scripts/config conf
-	-@if [ ! -f .config ] ; then \
-		touch .config; \
-	fi
+kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 
-scripts/config/mconf: scripts/config/Makefile
-	$(Q)$(MAKE) -C scripts/config ncurses conf mconf
-	-@if [ ! -f .config ] ; then \
-		touch .config; \
-	fi
+define verify_kallsyms
+	$(Q)$(if $($(quiet)cmd_sysmap),                       \
+	  echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
+	  $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
+	$(Q)cmp -s System.map .tmp_System.map ||              \
+		(echo Inconsistent kallsyms data;             \
+		 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
+		 rm .tmp_kallsyms* ; /bin/false )
+endef
 
-menuconfig: scripts/config/mconf
-	@[ -f .config ] || $(MAKE) $(MAKEFLAGS) defconfig
-	@./scripts/config/mconf $(CONFIG_CONFIG_IN)
+# Update busybox version before link
+# Use + in front of this rule to silent warning about make -j1
+# First command is ':' to allow us to use + in front of this rule
+cmd_ksym_ld = $(cmd_busybox__)
+define rule_ksym_ld
+	: 
+	+$(call cmd,busybox_version)
+	$(call cmd,busybox__)
+	$(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
+endef
 
-config: scripts/config/conf
-	@./scripts/config/conf $(CONFIG_CONFIG_IN)
+# Generate .S file with all kernel symbols
+quiet_cmd_kallsyms = KSYM    $@
+      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
+                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 
-oldconfig: scripts/config/conf
-	@./scripts/config/conf -o $(CONFIG_CONFIG_IN)
+.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
+	$(call if_changed_dep,as_o_S)
 
-randconfig: scripts/config/conf
-	@./scripts/config/conf -r $(CONFIG_CONFIG_IN)
+.tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
+	$(call cmd,kallsyms)
 
-allyesconfig: scripts/config/conf
-	@./scripts/config/conf -y $(CONFIG_CONFIG_IN) > /dev/null
+# .tmp_busybox1 must be complete except kallsyms, so update busybox version
+.tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
+	$(call if_changed_rule,ksym_ld)
 
-allnoconfig: scripts/config/conf
-	@./scripts/config/conf -n $(CONFIG_CONFIG_IN) > /dev/null
+.tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
+	$(call if_changed,busybox__)
 
-# defconfig is allyesconfig minus any features that are specialized enough
-# or cause enough behavior change that the user really should switch them on
-# manually if that's what they want.  Sort of "maximum sane config".
+.tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
+	$(call if_changed,busybox__)
 
-defconfig: scripts/config/conf
-	@./scripts/config/conf -y $(CONFIG_CONFIG_IN) > /dev/null
-	@$(SED) -i -r -e "s/^(CONFIG_(DEBUG.*|STATIC|SELINUX|NITPICK|BUILD_(AT_ONCE|LIBBUSYBOX)|FEATURE_(DEVFS|FULL_LIBBUSYBOX|SHARED_BUSYBOX|MTAB_SUPPORT|CLEAN_UP|UDHCP_DEBUG)|INSTALL_NO_USR))=.*/# \1 is not set/" .config
-	@./scripts/config/conf -o $(CONFIG_CONFIG_IN) > /dev/null
+# Needs to visit scripts/ before $(KALLSYMS) can be used.
+$(KALLSYMS): scripts ;
 
+# Generate some data for debugging strange kallsyms problems
+debug_kallsyms: .tmp_map$(last_kallsyms)
 
-allbareconfig: scripts/config/conf
-	@./scripts/config/conf -y $(CONFIG_CONFIG_IN) > /dev/null
-	@$(SED) -i -r -e "s/^(CONFIG_(DEBUG|STATIC|SELINUX|DEVFSD|NC_GAPING_SECURITY_HOLE|BUILD_AT_ONCE)).*/# \1 is not set/" .config
-	@$(SED) -i -e "/FEATURE/s/=.*//;/^[^#]/s/.*FEATURE.*/# \0 is not set/;" .config
-	@echo "CONFIG_FEATURE_BUFFERS_GO_ON_STACK=y" >> .config
-	@yes n | ./scripts/config/conf -o $(CONFIG_CONFIG_IN) > /dev/null
+.tmp_map%: .tmp_busybox% FORCE
+	($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 
-hosttools:
-	$(Q)cp .config .config.bak || noold=yea
-	$(Q)$(MAKE) CC="$(HOSTCC)" CFLAGS="$(HOSTCFLAGS) $(INCS)" allnoconfig
-	$(Q)mv .config .config.in
-	$(Q)(grep -v CONFIG_SED .config.in ; \
-	 echo "CONFIG_SED=y" ; ) > .config
-	$(Q)$(MAKE) CC="$(HOSTCC)" CFLAGS="$(HOSTCFLAGS) $(INCS)" oldconfig include/bb_config.h
-	$(Q)$(MAKE) CC="$(HOSTCC)" CFLAGS="$(HOSTCFLAGS) $(INCS)" busybox
-	$(Q)[ -f .config.bak ] && mv .config.bak .config || rm .config
-	mv busybox sed
-	@echo "Now do: $(MAKE) SED=$(top_builddir)/sed <target>"
+.tmp_map3: .tmp_map2
 
-else # ifneq ($(strip $(HAVE_DOT_CONFIG)),y)
+.tmp_map2: .tmp_map1
 
-all: busybox busybox.links doc
+endif # ifdef CONFIG_KALLSYMS
 
-# In this section, we need .config
--include $(top_builddir)/.config.cmd
-include $(patsubst %,%/Makefile.in, $(SRC_DIRS))
-
-endif # ifneq ($(strip $(HAVE_DOT_CONFIG)),y)
-
--include $(top_builddir)/.config
--include $(top_builddir)/.depend
-
-
-ifeq ($(strip $(CONFIG_BUILD_AT_ONCE)),y)
-libraries-y:=
-# Which parts of the internal libs are requested?
-# Per default we only want what was actually selected.
-# -a denotes all while -y denotes the selected ones.
-ifeq ($(strip $(CONFIG_FEATURE_FULL_LIBBUSYBOX)),y)
-LIBRARY_DEFINE:=$(LIBRARY_DEFINE-a)
-LIBRARY_SRC   :=$(LIBRARY_SRC-a)
-else # CONFIG_FEATURE_FULL_LIBBUSYBOX
-LIBRARY_DEFINE:=$(LIBRARY_DEFINE-y)
-LIBRARY_SRC   :=$(LIBRARY_SRC-y)
-endif # CONFIG_FEATURE_FULL_LIBBUSYBOX
-APPLET_SRC:=$(APPLET_SRC-y)
-APPLETS_DEFINE:=$(APPLETS_DEFINE-y)
-else  # CONFIG_BUILD_AT_ONCE
-APPLET_SRC:=
-# no --combine, build archives out of the individual .o
-# This was the old way the binary was built.
-libbusybox-obj:=archival/libunarchive/libunarchive.a \
-	networking/libiproute/libiproute.a \
-	libpwdgrp/libpwdgrp.a \
-	coreutils/libcoreutils/libcoreutils.a \
-	libbb/libbb.a
-libbusybox-obj:=$(patsubst %,$(top_builddir)/%,$(libbusybox-obj))
-
-ifeq ($(strip $(CONFIG_FEATURE_SHARED_BUSYBOX)),y)
-# linking against libbusybox, so don't build the .a already contained in the .so
-libraries-y:=$(filter-out $(libbusybox-obj),$(libraries-y))
-endif # CONFIG_FEATURE_SHARED_BUSYBOX
-endif # CONFIG_BUILD_AT_ONCE
-
-
-ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
-LD_LIBBUSYBOX:=libbusybox.so
-LIBBUSYBOX_SONAME:=$(LD_LIBBUSYBOX).$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)
-DO_INSTALL_LIBS:=$(LD_LIBBUSYBOX) \
-	$(LD_LIBBUSYBOX).$(MAJOR_VERSION) \
-	$(LD_LIBBUSYBOX).$(MAJOR_VERSION).$(MINOR_VERSION)
-endif # CONFIG_BUILD_LIBBUSYBOX
-
-ifeq ($(strip $(CONFIG_BUILD_AT_ONCE)),y)
-ifneq ($(strip $(CONFIG_FEATURE_SHARED_BUSYBOX)),y)
-# --combine but not linking against libbusybox, so compile all
-BUSYBOX_SRC   := $(LIBRARY_SRC)
-BUSYBOX_DEFINE:= $(LIBRARY_DEFINE)
-endif # !CONFIG_FEATURE_SHARED_BUSYBOX
-$(LIBBUSYBOX_SONAME): $(LIBRARY_SRC)
-else # CONFIG_BUILD_AT_ONCE
-$(LIBBUSYBOX_SONAME): $(libbusybox-obj)
-endif # CONFIG_BUILD_AT_ONCE
-
-ifeq ($(strip $(CONFIG_FEATURE_SHARED_BUSYBOX)),y)
-LDBUSYBOX:=-L$(top_builddir) -lbusybox
+# busybox image - including updated kernel symbols
+busybox_unstripped: $(busybox-all) FORCE
+	$(call if_changed_rule,busybox__)
+	$(Q)rm -f .old_version
+
+busybox: busybox_unstripped
+	$(Q)strip -s --remove-section=.note --remove-section=.comment \
+		busybox_unstripped -o $@
+
+# The actual objects are generated when descending, 
+# make sure no implicit rule kicks in
+$(sort $(busybox-all)): $(busybox-dirs) ;
+
+# Handle descending into subdirectories listed in $(busybox-dirs)
+# Preset locale variables to speed up the build process. Limit locale
+# tweaks to this spot to avoid wrong language settings when running
+# make menuconfig etc.
+# Error messages still appears in the original language
+
+PHONY += $(busybox-dirs)
+$(busybox-dirs): prepare scripts
+	$(Q)$(MAKE) $(build)=$@
+
+# Build the kernel release string
+# The KERNELRELEASE is stored in a file named .kernelrelease
+# to be used when executing for example make install or make modules_install
+#
+# Take the contents of any files called localversion* and the config
+# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
+# LOCALVERSION from the command line override all of this
+
+nullstring :=
+space      := $(nullstring) # end of line
+
+___localver = $(objtree)/localversion* $(srctree)/localversion*
+__localver  = $(sort $(wildcard $(___localver)))
+# skip backup files (containing '~')
+_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
+
+localver = $(subst $(space),, \
+	   $(shell cat /dev/null $(_localver)) \
+	   $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
+	       
+# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
+# and if the SCM is know a tag from the SCM is appended.
+# The appended tag is determinded by the SCM used.
+#
+# Currently, only git is supported.
+# Other SCMs can edit scripts/setlocalversion and add the appropriate
+# checks as needed.
+ifdef CONFIG_LOCALVERSION_AUTO
+	_localver-auto = $(shell $(CONFIG_SHELL) \
+	                  $(srctree)/scripts/setlocalversion $(srctree))
+	localver-auto  = $(LOCALVERSION)$(_localver-auto)
 endif
 
-ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
-$(LIBBUSYBOX_SONAME):
-ifndef MAJOR_VERSION
-	$(error MAJOR_VERSION needed for $@ is not defined)
+localver-full = $(localver)$(localver-auto)
+
+# Store (new) KERNELRELASE string in .kernelrelease
+kernelrelease = $(KERNELVERSION)$(localver-full)
+.kernelrelease: FORCE
+	$(Q)rm -f $@
+	$(Q)echo $(kernelrelease) > $@
+
+
+# Things we need to do before we recursively start building the kernel
+# or the modules are listed in "prepare".
+# A multi level approach is used. prepareN is processed before prepareN-1.
+# archprepare is used in arch Makefiles and when processed asm symlink,
+# version.h and scripts_basic is processed / created.
+
+# Listed in dependency order
+PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
+
+# prepare-all is deprecated, use prepare as valid replacement
+PHONY += prepare-all
+
+# prepare3 is used to check if we are building in a separate output directory,
+# and if so do:
+# 1) Check that make has not been executed in the kernel src $(srctree)
+# 2) Create the include2 directory, used for the second asm symlink
+prepare3: .kernelrelease
+ifneq ($(KBUILD_SRC),)
+	@echo '  Using $(srctree) as source for kernel'
+	$(Q)if [ -f $(srctree)/.config ]; then \
+		echo "  $(srctree) is not clean, please run 'make mrproper'";\
+		echo "  in the '$(srctree)' directory.";\
+		/bin/false; \
+	fi;
+	$(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
+	$(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 endif
-	$(do_link.so) \
-	-Wl,-soname=$(LD_LIBBUSYBOX).$(MAJOR_VERSION) \
-	-Wl,-z,combreloc
-	@rm -f $(DO_INSTALL_LIBS)
-	@for i in $(DO_INSTALL_LIBS); do ln -s $(@) $$i ; done
-	$(do_strip)
 
-endif # ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
+# prepare2 creates a makefile if using a separate output directory
+prepare2: prepare3 outputmakefile
+
+prepare1: prepare2 include/config/MARKER
+ifneq ($(KBUILD_MODULES),)
+	$(Q)mkdir -p $(MODVERDIR)
+	$(Q)rm -f $(MODVERDIR)/*
+endif
 
-busybox_unstripped: .depend $(LIBBUSYBOX_SONAME) $(BUSYBOX_SRC) $(APPLET_SRC) $(libraries-y)
-	$(do_link)
+archprepare: prepare1 scripts_basic
 
-busybox: busybox_unstripped
-	$(Q)cp busybox_unstripped busybox
-	$(do_strip)
+prepare0: archprepare FORCE
+	$(Q)$(MAKE) $(build)=.
 
-%.bflt: %_unstripped
-	$(do_elf2flt)
+# All the preparing..
+prepare prepare-all: prepare0
 
-busybox.links: $(top_srcdir)/applets/busybox.mkll include/bb_config.h $(top_srcdir)/include/applets.h
-	$(Q)-$(SHELL) $^ >$@
+#	Leave this as default for preprocessing busybox.lds.S, which is now
+#	done in arch/$(ARCH)/kernel/Makefile
 
-install: $(top_srcdir)/applets/install.sh busybox busybox.links
-	$(Q)DO_INSTALL_LIBS="$(strip $(LIBBUSYBOX_SONAME) $(DO_INSTALL_LIBS))" \
-		$(SHELL) $< $(PREFIX) $(INSTALL_OPTS)
-ifeq ($(strip $(CONFIG_FEATURE_SUID)),y)
-	@echo
+export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
+
+# 	FIXME: The asm symlink changes when $(ARCH) changes. That's
+#	hard to detect, but I suppose "make mrproper" is a good idea
+#	before switching between archs anyway.
+
+#bbox# include/asm:
+#bbox# 	@echo '  SYMLINK $@ -> include/asm-$(ARCH)'
+#bbox# 	$(Q)if [ ! -d include ]; then mkdir -p include; fi;
+#bbox# 	@ln -fsn asm-$(ARCH) $@
+
+# 	Split autoconf.h into include/linux/config/*
+#bbox# piggybacked generation of few .h files
+include/config/MARKER: scripts/basic/split-include include/autoconf.h
+	@echo '  SPLIT   include/autoconf.h -> include/config/*'
+	@scripts/basic/split-include include/autoconf.h include/config
+	@echo '  GEN     include/bbconfigopts.h'
+	@scripts/mkconfigs >include/bbconfigopts.h
+	@$(MAKE) $(build)=scripts
+	@echo '  GEN     include/usage_compressed.h'
+	@scripts/usage_compressed include/usage_compressed.h scripts
+	@touch $@
+
+# Generate some files
+# ---------------------------------------------------------------------------
+
+# KERNELRELEASE can change from a few different places, meaning version.h
+# needs to be updated, so this check is forced on all builds
+
+uts_len := 64
+
+define filechk_version.h
+	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
+	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
+	  exit 1; \
+	fi; \
+	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
+	  echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
+	 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
+	)
+endef
+
+# ---------------------------------------------------------------------------
+
+PHONY += depend dep
+depend dep:
+	@echo '*** Warning: make $@ is unnecessary now.'
+
+# ---------------------------------------------------------------------------
+# Modules
+
+ifdef CONFIG_MODULES
+
+# 	By default, build modules as well
+
+all: modules
+
+#	Build modules
+
+PHONY += modules
+modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
+	@echo '  Building modules, stage 2.';
+	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
+
+
+# Target to prepare building external modules
+PHONY += modules_prepare
+modules_prepare: prepare scripts
+
+# Target to install modules
+PHONY += modules_install
+modules_install: _modinst_ _modinst_post
+
+PHONY += _modinst_
+_modinst_:
+	@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
+		echo "Warning: you may need to install module-init-tools"; \
+		echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
+		sleep 1; \
+	fi
+	@rm -rf $(MODLIB)/kernel
+	@rm -f $(MODLIB)/source
+	@mkdir -p $(MODLIB)/kernel
+	@ln -s $(srctree) $(MODLIB)/source
+	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
+		rm -f $(MODLIB)/build ; \
+		ln -s $(objtree) $(MODLIB)/build ; \
+	fi
+	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
+
+# If System.map exists, run depmod.  This deliberately does not have a
+# dependency on System.map since that would run the dependency tree on
+# busybox.  This depmod is only for convenience to give the initial
+# boot a modules.dep even before / is mounted read-write.  However the
+# boot script depmod is the master version.
+ifeq "$(strip $(INSTALL_MOD_PATH))" ""
+depmod_opts	:=
+else
+depmod_opts	:= -b $(INSTALL_MOD_PATH) -r
+endif
+PHONY += _modinst_post
+_modinst_post: _modinst_
+	if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
+
+else # CONFIG_MODULES
+
+# Modules not configured
+# ---------------------------------------------------------------------------
+
+modules modules_install: FORCE
 	@echo
-	@echo --------------------------------------------------
-	@echo You will probably need to make your busybox binary
-	@echo setuid root to ensure all configured applets will
-	@echo work properly.
-	@echo --------------------------------------------------
+	@echo "The present kernel configuration has modules disabled."
+	@echo "Type 'make config' and enable loadable module support."
+	@echo "Then build a kernel with module support enabled."
 	@echo
-endif
+	@exit 1
 
-uninstall: busybox.links
-	rm -f $(PREFIX)/bin/busybox
-	for i in `cat busybox.links` ; do rm -f $(PREFIX)$$i; done
-ifneq ($(strip $(DO_INSTALL_LIBS)),n)
-	for i in $(LIBBUSYBOX_SONAME) $(DO_INSTALL_LIBS); do \
-		rm -f $(PREFIX)$$i; \
-	done
-endif
+endif # CONFIG_MODULES
 
-check test: busybox
-	bindir=$(top_builddir) srcdir=$(top_srcdir)/testsuite SED="$(SED)" \
-	$(SHELL) $(top_srcdir)/testsuite/runtest $(CHECK_VERBOSE)
+###
+# Cleaning is done on three levels.
+# make clean     Delete most generated files
+#                Leave enough to build external modules
+# make mrproper  Delete the current configuration, and all generated files
+# make distclean Remove editor backup files, patch leftover files and the like
+
+# Directories & files removed with 'make clean'
+CLEAN_DIRS  += $(MODVERDIR)
+CLEAN_FILES +=	busybox System.map \
+                .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
+
+# Directories & files removed with 'make mrproper'
+MRPROPER_DIRS  += include/config include2
+MRPROPER_FILES += .config .config.old include/asm .version .old_version \
+                  include/autoconf.h \
+		  .kernelrelease Module.symvers tags TAGS cscope*
+
+# clean - Delete most, but leave enough to build external modules
+#
+clean: rm-dirs  := $(CLEAN_DIRS)
+clean: rm-files := $(CLEAN_FILES)
+clean-dirs      := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
+
+PHONY += $(clean-dirs) clean archclean
+$(clean-dirs):
+	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
+
+clean: archclean $(clean-dirs)
+	$(call cmd,rmdirs)
+	$(call cmd,rmfiles)
+	@find . $(RCS_FIND_IGNORE) \
+	 	\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
+		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
+		-type f -print | xargs rm -f
+
+# mrproper - Delete all generated files, including .config
+#
+mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
+mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
+mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 
-checkhelp:
-	$(Q)$(top_srcdir)/scripts/checkhelp.awk \
-		$(wildcard $(patsubst %,%/Config.in,$(SRC_DIRS) ./))
+PHONY += $(mrproper-dirs) mrproper archmrproper
+$(mrproper-dirs):
+	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 
-sizes: busybox_unstripped
-	$(NM) --size-sort $(<)
+mrproper: clean archmrproper $(mrproper-dirs)
+	$(call cmd,rmdirs)
+	$(call cmd,rmfiles)
 
-bloatcheck: busybox_old busybox_unstripped
-	@$(top_srcdir)/scripts/bloat-o-meter busybox_old busybox_unstripped
+# distclean
+#
+PHONY += distclean
 
-baseline: busybox_unstripped
-	@mv busybox_unstripped busybox_old
+distclean: mrproper
+	@find $(srctree) $(RCS_FIND_IGNORE) \
+	 	\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
+		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
+	 	-o -name '.*.rej' -o -size 0 \
+		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
+		-type f -print | xargs rm -f
 
-objsizes: busybox_unstripped
-	$(SHELL) $(top_srcdir)/scripts/objsizes
 
-# Documentation Targets
-doc: docs/busybox.pod docs/BusyBox.txt docs/BusyBox.1 docs/BusyBox.html
+# Packaging of the kernel to various formats
+# ---------------------------------------------------------------------------
+# rpm target kept for backward compatibility
+package-dir	:= $(srctree)/scripts/package
 
-docs/busybox.pod : $(top_srcdir)/docs/busybox_header.pod $(top_srcdir)/include/usage.h $(top_srcdir)/docs/busybox_footer.pod $(top_srcdir)/docs/autodocifier.pl
-	$(disp_doc)
-	$(Q)-mkdir -p docs
-	$(Q)-( cat $(top_srcdir)/docs/busybox_header.pod ; \
-	    $(top_srcdir)/docs/autodocifier.pl $(top_srcdir)/include/usage.h ; \
-	    cat $(top_srcdir)/docs/busybox_footer.pod ; ) > docs/busybox.pod
+%pkg: FORCE
+	$(Q)$(MAKE) $(build)=$(package-dir) $@
+rpm: FORCE
+	$(Q)$(MAKE) $(build)=$(package-dir) $@
 
-docs/BusyBox.txt: docs/busybox.pod
-	$(disp_doc)
-	$(Q)-mkdir -p docs
-	$(Q)-pod2text $< > $@
 
-docs/BusyBox.1: docs/busybox.pod
-	$(disp_doc)
-	$(Q)-mkdir -p docs
-	$(Q)-pod2man --center=BusyBox --release="version $(VERSION)" \
-		$< > $@
+# Brief documentation of the typical targets used
+# ---------------------------------------------------------------------------
 
-docs/BusyBox.html: docs/busybox.net/BusyBox.html
-	$(disp_doc)
-	$(Q)-mkdir -p docs
-	$(Q)-rm -f docs/BusyBox.html
-	$(Q)-cp docs/busybox.net/BusyBox.html docs/BusyBox.html
+boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
+boards := $(notdir $(boards))
 
-docs/busybox.net/BusyBox.html: docs/busybox.pod
-	$(Q)-mkdir -p docs/busybox.net
-	$(Q)-pod2html --noindex $< > \
-	    docs/busybox.net/BusyBox.html
-	$(Q)-rm -f pod2htm*
+-include Makefile.help
 
-# The nifty new dependency stuff
-scripts/bb_mkdep: $(top_srcdir)/scripts/bb_mkdep.c
-	$(do_link.h)
+# Documentation targets
+# ---------------------------------------------------------------------------
+%docs: scripts_basic FORCE
+	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
+
+else # KBUILD_EXTMOD
+
+###
+# External module support.
+# When building external modules the kernel used as basis is considered
+# read-only, and no consistency checks are made and the make
+# system is not used on the basis kernel. If updates are required
+# in the basis kernel ordinary make commands (without M=...) must
+# be used.
+#
+# The following are the only valid targets when building external
+# modules.
+# make M=dir clean     Delete all automatically generated files
+# make M=dir modules   Make all modules in specified dir
+# make M=dir	       Same as 'make M=dir modules'
+# make M=dir modules_install
+#                      Install the modules build in the module directory
+#                      Assumes install directory is already created
+
+# We are always building modules
+KBUILD_MODULES := 1
+PHONY += crmodverdir
+crmodverdir:
+	$(Q)mkdir -p $(MODVERDIR)
+	$(Q)rm -f $(MODVERDIR)/*
+
+PHONY += $(objtree)/Module.symvers
+$(objtree)/Module.symvers:
+	@test -e $(objtree)/Module.symvers || ( \
+	echo; \
+	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
+	echo "           is missing; modules will have no dependencies and modversions."; \
+	echo )
+
+module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
+PHONY += $(module-dirs) modules
+$(module-dirs): crmodverdir $(objtree)/Module.symvers
+	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
+
+modules: $(module-dirs)
+	@echo '  Building modules, stage 2.';
+	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
+
+PHONY += modules_install
+modules_install: _emodinst_ _emodinst_post
+
+install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
+PHONY += _emodinst_
+_emodinst_:
+	$(Q)mkdir -p $(MODLIB)/$(install-dir)
+	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
+
+# Run depmod only is we have System.map and depmod is executable
+quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
+      cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
+                      $(DEPMOD) -ae -F System.map             \
+                      $(if $(strip $(INSTALL_MOD_PATH)),      \
+		      -b $(INSTALL_MOD_PATH) -r)              \
+		      $(KERNELRELEASE);                       \
+                   fi
+
+PHONY += _emodinst_post
+_emodinst_post: _emodinst_
+	$(call cmd,depmod)
+
+clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
+
+PHONY += $(clean-dirs) clean
+$(clean-dirs):
+	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
+
+clean:	rm-dirs := $(MODVERDIR)
+clean: $(clean-dirs)
+	$(call cmd,rmdirs)
+	@find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
+	 	\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
+		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
+		-type f -print | xargs rm -f
 
-DEP_INCLUDES := include/bb_config.h
+help:
+	@echo  '  Building external modules.'
+	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
+	@echo  ''
+	@echo  '  modules         - default target, build the module(s)'
+	@echo  '  modules_install - install the module'
+	@echo  '  clean           - remove generated files in module directory only'
+	@echo  ''
+
+# Dummies...
+PHONY += prepare scripts
+prepare: ;
+scripts: ;
+endif # KBUILD_EXTMOD
+
+# Generate tags for editors
+# ---------------------------------------------------------------------------
 
-ifeq ($(strip $(CONFIG_BBCONFIG)),y)
-DEP_INCLUDES += include/bbconfigopts.h
+#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
+#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
+#Adding $(srctree) adds about 20M on i386 to the size of the output file!
 
-include/bbconfigopts.h: .config $(top_srcdir)/scripts/config/mkconfigs
-	$(disp_gen)
-	$(Q)$(top_srcdir)/scripts/config/mkconfigs > $@
+ifeq ($(src),$(obj))
+__srctree =
+else
+__srctree = $(srctree)/
 endif
 
-ifeq ($(strip $(CONFIG_FEATURE_COMPRESS_USAGE)),y)
-USAGE_BIN:=scripts/usage
-$(USAGE_BIN): $(top_srcdir)/scripts/usage.c .config \
-		$(top_srcdir)/include/usage.h
-	$(do_link.h)
-
-DEP_INCLUDES += include/usage_compressed.h
-
-include/usage_compressed.h: .config $(USAGE_BIN) \
-		$(top_srcdir)/scripts/usage_compressed
-	$(Q)SED="$(SED)" $(SHELL) $(top_srcdir)/scripts/usage_compressed \
-	"$(top_builddir)/scripts" > $@
-endif # CONFIG_FEATURE_COMPRESS_USAGE
-
-depend dep: .depend
-.depend: scripts/bb_mkdep $(USAGE_BIN) $(DEP_INCLUDES)
-	$(disp_gen)
-	$(Q)rm -f .depend
-	$(Q)mkdir -p include/config
-	$(Q)scripts/bb_mkdep -I $(top_srcdir)/include $(top_srcdir) > $@.tmp
-	$(Q)mv $@.tmp $@
-
-include/bb_config.h: .config
-	@if [ ! -x $(top_builddir)/scripts/config/conf ] ; then \
-	    $(MAKE) -C scripts/config conf; \
-	fi;
-	@$(top_builddir)/scripts/config/conf -o $(CONFIG_CONFIG_IN)
-
-clean:
-	- $(MAKE) -C scripts/config $@
-	- rm -f docs/busybox.dvi docs/busybox.ps \
-	    docs/busybox.pod docs/busybox.net/busybox.html \
-	    docs/busybox pod2htm* *.gdb *.elf *~ core .*config.log \
-	    docs/BusyBox.txt docs/BusyBox.1 docs/BusyBox.html \
-	    docs/busybox.net/BusyBox.html busybox.links \
-	    libbusybox.so* \
-	    .config.old busybox busybox_unstripped \
-	    include/usage_compressed.h scripts/usage
-	- rm -r -f _install testsuite/links
-	- find . -name .\*.flags -o -name \*.o  -o -name \*.om -o -name \*.syn \
-	    -o -name \*.os -o -name \*.osm -o -name \*.a | xargs rm -f
-
-distclean: clean
-	rm -f scripts/bb_mkdep scripts/usage
-	rm -r -f include/config include/config.h $(DEP_INCLUDES)
-	find . -name .depend'*' -print0 | xargs -0 rm -f
-	find . -name '*.rej' -print0 | xargs -0 rm -f
-	rm -f .hdepend busybox_old .config .config.old .config.cmd
-
-release: distclean #doc
-	cd ..; \
-	rm -r -f $(PROG)-$(VERSION); \
-	cp -a busybox $(PROG)-$(VERSION); \
-	\
-	find $(PROG)-$(VERSION)/ -type d \
-		-name .svn \
-		-print \
-		-exec rm -r -f {} \; ; \
-	\
-	find $(PROG)-$(VERSION)/ -type f \
-		-name .\#* \
-		-print \
-		-exec rm -f {} \; ; \
-	\
-	tar -cvzf $(PROG)-$(VERSION).tar.gz $(PROG)-$(VERSION)/;
-
-tags:
-	ctags -R .
-
-# documentation, cross-reference
-# Modern distributions already ship synopsis packages (e.g. debian)
-# If you have an old distribution go to http://synopsis.fresco.org/
-syn_tgt := $(wildcard $(patsubst %,%/*.c,$(SRC_DIRS)))
-syn     := $(patsubst %.c, %.syn, $(syn_tgt))
-
-%.syn: %.c
-	synopsis -p C -l Comments.SSDFilter,Comments.Previous $(INCS) -Wp,verbose,debug,preprocess,cppflags="'$(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) $(PROG_CFLAGS) $(PROG_LDFLAGS) $(CFLAGS_COMBINE) $(APPLETS_DEFINE) $(BUSYBOX_DEFINE)'" -o $@ $<
-html: $(syn)
-	synopsis -f HTML -Wf,title="'BusyBox Documentation'" -o $@ $^
-
-
-endif # ifeq ($(skip-makefile),)
+ifeq ($(ALLSOURCE_ARCHS),)
+ifeq ($(ARCH),um)
+ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
+else
+ALLINCLUDE_ARCHS := $(ARCH)
+endif
+else
+#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
+ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
+endif
+
+ALLSOURCE_ARCHS := $(ARCH)
+
+define all-sources
+	( find $(__srctree) $(RCS_FIND_IGNORE) \
+	       \( -name include -o -name arch \) -prune -o \
+	       -name '*.[chS]' -print; \
+	  for ARCH in $(ALLSOURCE_ARCHS) ; do \
+	       find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
+	            -name '*.[chS]' -print; \
+	  done ; \
+	  find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
+	       -name '*.[chS]' -print; \
+	  find $(__srctree)include $(RCS_FIND_IGNORE) \
+	       \( -name config -o -name 'asm-*' \) -prune \
+	       -o -name '*.[chS]' -print; \
+	  for ARCH in $(ALLINCLUDE_ARCHS) ; do \
+	       find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
+	            -name '*.[chS]' -print; \
+	  done ; \
+	  find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
+	       -name '*.[chS]' -print )
+endef
+
+quiet_cmd_cscope-file = FILELST cscope.files
+      cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
+
+quiet_cmd_cscope = MAKE    cscope.out
+      cmd_cscope = cscope -b
+
+cscope: FORCE
+	$(call cmd,cscope-file)
+	$(call cmd,cscope)
+
+quiet_cmd_TAGS = MAKE   $@
+define cmd_TAGS
+	rm -f $@; \
+	ETAGSF=`etags --version | grep -i exuberant >/dev/null &&     \
+                echo "-I __initdata,__exitdata,__acquires,__releases  \
+                      -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
+                      --extra=+f --c-kinds=+px"`;                     \
+                $(all-sources) | xargs etags $$ETAGSF -a
+endef
+
+TAGS: FORCE
+	$(call cmd,TAGS)
+
+
+quiet_cmd_tags = MAKE   $@
+define cmd_tags
+	rm -f $@; \
+	CTAGSF=`ctags --version | grep -i exuberant >/dev/null &&     \
+                echo "-I __initdata,__exitdata,__acquires,__releases  \
+                      -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
+                      --extra=+f --c-kinds=+px"`;                     \
+                $(all-sources) | xargs ctags $$CTAGSF -a
+endef
+
+tags: FORCE
+	$(call cmd,tags)
+
+
+# Scripts to check various things for consistency
+# ---------------------------------------------------------------------------
+
+includecheck:
+	find * $(RCS_FIND_IGNORE) \
+		-name '*.[hcS]' -type f -print | sort \
+		| xargs $(PERL) -w scripts/checkincludes.pl
+
+versioncheck:
+	find * $(RCS_FIND_IGNORE) \
+		-name '*.[hcS]' -type f -print | sort \
+		| xargs $(PERL) -w scripts/checkversion.pl
+
+namespacecheck:
+	$(PERL) $(srctree)/scripts/namespace.pl
+
+endif #ifeq ($(config-targets),1)
+endif #ifeq ($(mixed-targets),1)
+
+PHONY += checkstack
+checkstack:
+	$(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
+	$(PERL) $(src)/scripts/checkstack.pl $(ARCH)
+
+kernelrelease:
+	$(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
+	$(error kernelrelease not valid - run 'make *config' to update it))
+kernelversion:
+	@echo $(KERNELVERSION)
+
+# Single targets
+# ---------------------------------------------------------------------------
+# Single targets are compatible with:
+# - build whith mixed source and output
+# - build with separate output dir 'make O=...'
+# - external modules
+#
+#  target-dir => where to store outputfile
+#  build-dir  => directory in kernel source tree to use
+
+ifeq ($(KBUILD_EXTMOD),)
+        build-dir  = $(patsubst %/,%,$(dir $@))
+        target-dir = $(dir $@)
+else
+        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
+        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
+        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
+endif
+
+%.s: %.c prepare scripts FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+%.i: %.c prepare scripts FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+%.o: %.c prepare scripts FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+%.lst: %.c prepare scripts FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+%.s: %.S prepare scripts FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+%.o: %.S prepare scripts FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+
+# Modules
+/ %/: prepare scripts FORCE
+	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
+	$(build)=$(build-dir)
+%.ko: prepare scripts FORCE
+	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
+	$(build)=$(build-dir) $(@:.ko=.o)
+	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
+
+# FIXME Should go into a make.lib or something 
+# ===========================================================================
+
+quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
+      cmd_rmdirs = rm -rf $(rm-dirs)
+
+quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
+      cmd_rmfiles = rm -f $(rm-files)
+
+
+a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
+	  $(NOSTDINC_FLAGS) $(CPPFLAGS) \
+	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
+
+quiet_cmd_as_o_S = AS      $@
+cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
+
+# read all saved command lines
+
+targets := $(wildcard $(sort $(targets)))
+cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
+
+ifneq ($(cmd_files),)
+  $(cmd_files): ;	# Do not try to update included dependency files
+  include $(cmd_files)
+endif
+
+# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
+# Usage:
+# $(Q)$(MAKE) $(clean)=dir
+clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
+
+endif	# skip-makefile
+
+PHONY += FORCE
+FORCE:
+
+-include Makefile.custom
 
+# Declare the contents of the .PHONY variable as phony.  We keep that
+# information in a variable se we can use it in if_changed and friends.
+.PHONY: $(PHONY)