Merge bk://linux-sam.bkbits.net/kbuild

into home.osdl.org:/home/torvalds/v2.5/linux

Documentation/kbuild/00-INDEX

@@ -4,3 +4,5 @@ kconfig-language.txt
 	- specification of Config Language, the language in Kconfig files
 makefiles.txt
 	- developer information for linux kernel makefiles
+modules.txt
+	- how to build modules and to install them

Documentation/kbuild/modules.txt

+For now this is a raw copy from the old Documentation/modules.txt,
+which was removed in 2.6.0-test5.
+The information herein is correct but not complete.
+
+Installing modules in a non-standard location
+---------------------------------------------
+When the modules needs to be installed under another directory
+the INSTALL_MOD_PATH can be used to prefix "/lib/modules" as seen
+in the following example:
+
+make INSTALL_MOD_PATH=/frodo modules_install
+
+This will install the modules in the directory /frodo/lib/modules.
+/frodo can be a NFS mounted filesystem on another machine, allowing
+out-of-the-box support for installation on remote machines.
+
+
+Compiling modules outside the official kernel
+---------------------------------------------
+Often modules are developed outside the official kernel.
+To keep up with changes in the build system the most portable way
+to compile a module outside the kernel is to use the following command-line:
+
+make -C path/to/kernel/src SUBDIRS=$PWD modules
+
+This requires that a makefile exits made in accordance to
+Documentation/kbuild/makefiles.txt.
+

Makefile

@@ -9,6 +9,9 @@ EXTRAVERSION = -test5
 # 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.
 #
@@ -25,6 +28,87 @@ EXTRAVERSION = -test5
 # descending is started. They are now explicitly listed as the
 # prepare rule.
 
+# To put more focus on warnings, be less verbose as default
+# Use 'make V=1' to see the full commands
+
+ifdef V
+  ifeq ("$(origin V)", "command line")
+    KBUILD_VERBOSE = $(V)
+  endif
+endif
+ifndef KBUILD_VERBOSE
+  KBUILD_VERBOSE = 0 
+endif
+
+# Call sparse as part of compilation of C files
+# Use 'make C=1' to enable sparse checking
+
+ifdef C
+  ifeq ("$(origin C)", "command line")
+    KBUILD_CHECKSRC = $(C)
+  endif
+endif
+ifndef KBUILD_CHECKSRC
+  KBUILD_CHECKSRC = 0
+endif
+
+# kbuild supports saving output files in a separate directory.
+# To locate output files in a separate directory two syntax'es are supported.
+# In both cases the working directory must be the root of the kernel src.
+# 1) O=
+# Use "make O=dir/to/store/output/files/"
+# 
+# 2) Set KBUILD_OUTPUT
+# Set the environment variable KBUILD_OUTPUT to point to the directory
+# where the output files shall be placed.
+# export KBUILD_OUTPUT=dir/to/store/output/files/
+# make
+#
+# The O= assigment takes precedence over the KBUILD_OUTPUT environment variable.
+
+
+# KBUILD_SRC is set on invocation of make in OBJ directory
+# KBUILD_SRC is not intended to be used by the regular user (for now)
+ifeq ($(KBUILD_SRC),)
+
+# 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")
+    KBUILD_OUTPUT := $(O)
+  endif
+endif
+
+ifneq ($(KBUILD_OUTPUT),)
+# Invoke a second make in the output directory, passing relevant variables
+	KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT); /bin/pwd)
+
+.PHONY: $(MAKECMDGOALS) all
+
+$(MAKECMDGOALS) all:
+	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT)		\
+	KBUILD_SRC=$(CURDIR)	KBUILD_VERBOSE=$(KBUILD_VERBOSE)	\
+	KBUILD_CHECK=$(KBUILD_CHECK) -f $(CURDIR)/Makefile $(MAKECMDGOALS)
+
+# Leave processing to above invocation of make
+skip-makefile := 1
+endif # ifneq ($(KBUILD_OUTPUT),)
+endif # ifeq ($(KBUILD_SRC),)
+
+# We process the rest of the Makefile if this is the final invocation of make
+ifeq ($(skip-makefile),)
+
+srctree		:= $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
+TOPDIR		:= $(srctree)
+# FIXME - TOPDIR is obsolete, use srctree/objtree
+objtree		:= $(CURDIR)
+src		:= $(srctree)
+obj		:= $(objtree)
+
+VPATH		:= $(srctree)
+
+export srctree objtree VPATH TOPDIR
+
 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 
 # SUBARCH tells the usermode build what the underlying arch is.  That is set
@@ -37,9 +121,6 @@ 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/ )
 
-# Remove hyphens since they have special meaning in RPM filenames
-KERNELPATH=kernel-$(subst -,,$(KERNELRELEASE))
-
 # Cross compiling and selecting different set of gcc/bin-utils
 # ---------------------------------------------------------------------------
 #
@@ -69,7 +150,6 @@ UTS_MACHINE := $(ARCH)
 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 	  else if [ -x /bin/bash ]; then echo /bin/bash; \
 	  else echo sh; fi ; fi)
-TOPDIR	:= $(CURDIR)
 
 HOSTCC  	= gcc
 HOSTCXX  	= g++
@@ -110,40 +190,8 @@ ifeq ($(MAKECMDGOALS),)
   KBUILD_MODULES := 1
 endif
 
-export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE KBUILD_CHECKSRC
-
-# To put more focus on warnings, less verbose as default
-# Use 'make V=1' to see the full commands
-
-ifdef V
-  ifeq ("$(origin V)", "command line")
-    KBUILD_VERBOSE = $(V)
-  endif
-endif
-ifndef KBUILD_VERBOSE
-  KBUILD_VERBOSE = 0 
-endif
-
-# Call sparse as part of compilation of C files
-# Use 'make C=1' to enable sparse checking
-
-ifdef C
-  ifeq ("$(origin C)", "command line")
-    KBUILD_CHECKSRC = $(C)
-  endif
-endif
-ifndef KBUILD_CHECKSRC
-  KBUILD_CHECKSRC = 0
-endif
-
-# Do not print 'Entering directory ...'
-
-MAKEFLAGS += --no-print-directory
-
-# For maximum performance (+ possibly random breakage, uncomment
-# the following)
-
-#MAKEFLAGS += -rR
+export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
+export KBUILD_CHECKSRC KBUILD_SRC
 
 # Beautify output
 # ---------------------------------------------------------------------------
@@ -185,14 +233,13 @@ endif
 
 export quiet Q KBUILD_VERBOSE
 
-# Paths to obj / src tree
+# Look for make include files relative to root of kernel src
+MAKEFLAGS += --include-dir=$(srctree)
 
-src	:= .
-obj	:= .
-srctree := .
-objtree := .
+# For maximum performance (+ possibly random breakage, uncomment
+# the following)
 
-export srctree objtree
+#MAKEFLAGS += -rR
 
 # Make variables (CC, etc...)
 
@@ -222,13 +269,15 @@ AFLAGS_KERNEL	=
 
 NOSTDINC_FLAGS  = -nostdinc -iwithprefix include
 
-CPPFLAGS	:= -D__KERNEL__ -Iinclude
+CPPFLAGS        := -D__KERNEL__ -Iinclude \
+		   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
+
 CFLAGS 		:= -Wall -Wstrict-prototypes -Wno-trigraphs -O2 \
 	  	   -fno-strict-aliasing -fno-common
 AFLAGS		:= -D__ASSEMBLY__
 
 export	VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
-	CONFIG_SHELL TOPDIR HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
+	CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 	CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 	HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE CHECK
 
@@ -253,12 +302,15 @@ RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CV
 
 # Helpers built in scripts/
 
-scripts/docproc scripts/fixdep scripts/split-include : scripts ;
+scripts/docproc scripts/split-include : scripts ;
 
-.PHONY: scripts
+.PHONY: scripts scripts/fixdep
 scripts:
 	$(Q)$(MAKE) $(build)=scripts
 
+scripts/fixdep:
+	$(Q)$(MAKE) $(build)=scripts $@
+
 
 # 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
@@ -294,7 +346,7 @@ ifeq ($(mixed-targets),1)
 # Handle them one by one.
 
 %:: FORCE
-	$(Q)$(MAKE) $@
+	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 
 else
 ifeq ($(config-targets),1)
@@ -336,12 +388,12 @@ include .config
 
 # If .config is newer than include/linux/autoconf.h, someone tinkered
 # with it and forgot to run make oldconfig
-include/linux/autoconf.h: scripts/fixdep .config
-	$(Q)$(MAKE) $(build)=scripts/kconfig silentoldconfig
+include/linux/autoconf.h: .config
+	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 
 endif
 
-include arch/$(ARCH)/Makefile
+include $(srctree)/arch/$(ARCH)/Makefile
 
 # Let architecture Makefiles change CPPFLAGS if needed
 CFLAGS := $(CPPFLAGS) $(CFLAGS)
@@ -487,14 +539,34 @@ $(sort $(vmlinux-objs)) arch/$(ARCH)/kernel/vmlinux.lds.s: $(SUBDIRS) ;
 # 	Handle descending into subdirectories listed in $(SUBDIRS)
 
 .PHONY: $(SUBDIRS)
-$(SUBDIRS): prepare
+$(SUBDIRS): prepare-all
 	$(Q)$(MAKE) $(build)=$@
 
-#	Things we need done before we descend to build or make
-#	module versions are listed in "prepare"
+# Things we need to do before we recursively start building the kernel
+# or the modules are listed in "prepare-all".
+# A multi level approach is used. prepare1 is updated first, then prepare0.
+# prepare-all is the collection point for the prepare targets.
+
+.PHONY: prepare-all prepare prepare0 prepare1
+
+# prepare1 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 $(srctree)
+# 2) Create the include2 directory, used for the second asm symlink
+
+prepare1:
+ifneq ($(KBUILD_SRC),)
+	@echo '  Using $(srctree) as source for kernel'
+	$(Q)if [ -h $(srctree)/include/asm -o -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
 
-.PHONY: prepare
-prepare: include/linux/version.h include/asm include/config/MARKER
+prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
 ifdef KBUILD_MODULES
 ifeq ($(origin SUBDIRS),file)
 	$(Q)rm -rf $(MODVERDIR)
@@ -505,6 +577,9 @@ endif
 endif
 	$(if $(CONFIG_MODULES),$(Q)mkdir -p $(MODVERDIR))
 
+# All the preparing..
+prepare-all: prepare0 prepare
+
 #	Leave this as default for preprocessing vmlinux.lds.S, which is now
 #	done in arch/$(ARCH)/kernel/Makefile
 
@@ -533,8 +608,9 @@ export AFLAGS_vmlinux.lds.o += -P -C -U$(ARCH)
 #	before switching between archs anyway.
 
 include/asm:
-	@echo '  Making asm->asm-$(ARCH) symlink'
-	@ln -s asm-$(ARCH) $@
+	@echo '  SYMLINK $@ -> include/asm-$(ARCH)'
+	$(Q)if [ ! -d include ]; then mkdir -p include; fi;
+	@ln -fsn asm-$(ARCH) $@
 
 # 	Split autoconf.h into include/linux/config/*
 
@@ -585,7 +661,7 @@ all: modules
 .PHONY: modules
 modules: $(SUBDIRS) $(if $(KBUILD_BUILTIN),vmlinux)
 	@echo '  Building modules, stage 2.';
-	$(Q)$(MAKE) -rR -f scripts/Makefile.modpost
+	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 
 #	Install modules
 
@@ -603,7 +679,7 @@ _modinst_:
 	@rm -f $(MODLIB)/build
 	@mkdir -p $(MODLIB)/kernel
 	@ln -s $(TOPDIR) $(MODLIB)/build
-	$(Q)$(MAKE) -rR -f scripts/Makefile.modinst
+	$(Q)$(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
@@ -672,7 +748,7 @@ MRPROPER_FILES += \
 	.menuconfig.log \
 	include/asm \
 	.hdepend include/linux/modversions.h \
-	tags TAGS cscope kernel.spec \
+	tags TAGS cscope.out kernel.spec \
 	.tmp*
 
 # Directories removed with 'make mrproper'
@@ -680,7 +756,8 @@ MRPROPER_DIRS += \
 	$(MODVERDIR) \
 	.tmp_export-objs \
 	include/config \
-	include/linux/modules
+	include/linux/modules \
+	include2
 
 # clean - Delete all intermediate files
 #
@@ -759,31 +836,32 @@ tags: FORCE
 
 .PHONY: rpm
 
+# Remove hyphens since they have special meaning in RPM filenames
+KERNELPATH=kernel-$(subst -,,$(KERNELRELEASE))
+
 #	If you do a make spec before packing the tarball you can rpm -ta it
 
 spec:
-	. $(srctree)/scripts/mkspec >kernel.spec
+	$(CONFIG_SHELL) $(srctree)/scripts/mkspec > $(objtree)/kernel.spec
 
-#	Build a tar ball, generate an rpm from it and pack the result
-#	There are two bits of magic here
-#	1) The use of /. to avoid tar packing just the symlink
-#	2) Removing the .dep files as they have source paths in them that
-#	   will become invalid
+#	a) Build a tar ball
+#	b) generate an rpm from it
+#	c) and pack the result
+#	- Use /. to avoid tar packing just the symlink
 
 rpm:	clean spec
-	find . $(RCS_FIND_IGNORE) \
-		\( -size 0 -o -name .depend -o -name .hdepend \) \
-		-type f -print | xargs rm -f
 	set -e; \
-	cd $(TOPDIR)/.. ; \
-	ln -sf $(TOPDIR) $(KERNELPATH) ; \
+	cd .. ; \
+	ln -sf $(srctree) $(KERNELPATH) ; \
 	tar -cvz $(RCS_TAR_IGNORE) -f $(KERNELPATH).tar.gz $(KERNELPATH)/. ; \
-	rm $(KERNELPATH) ; \
-	cd $(TOPDIR) ; \
-	$(CONFIG_SHELL) $(srctree)/scripts/mkversion > .tmp_version ; \
-	mv -f .tmp_version .version; \
-	$(RPM) -ta $(TOPDIR)/../$(KERNELPATH).tar.gz ; \
-	rm $(TOPDIR)/../$(KERNELPATH).tar.gz
+	rm $(KERNELPATH)
+
+	set -e; \
+	$(CONFIG_SHELL) $(srctree)/scripts/mkversion > $(objtree)/.tmp_version;\
+	mv -f $(objtree)/.tmp_version $(objtree)/.version;
+
+	$(RPM) -ta ../$(KERNELPATH).tar.gz
+	rm ../$(KERNELPATH).tar.gz
 
 # Brief documentation of the typical targets used
 # ---------------------------------------------------------------------------
@@ -814,6 +892,7 @@ help:
 		echo '  No architecture specific help defined for $(ARCH)')
 	@echo  ''
 	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
+	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
 	@echo  '  make C=1   [targets] Check all c source with checker tool'
 	@echo  ''
 	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
@@ -849,7 +928,8 @@ endif #ifeq ($(mixed-targets),1)
 # FIXME Should go into a make.lib or something 
 # ===========================================================================
 
-a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) $(NOSTDINC_FLAGS) \
+a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
+	  $(NOSTDINC_FLAGS) $(CPPFLAGS) \
 	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
 
 quiet_cmd_as_o_S = AS      $@
@@ -907,6 +987,7 @@ cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
 define filechk
 	@set -e;				\
 	echo '  CHK     $@';			\
+	mkdir -p $(dir $@);			\
 	$(filechk_$(1)) < $< > $@.tmp;		\
 	if [ -r $@ ] && cmp -s $@ $@.tmp; then	\
 		rm -f $@.tmp;			\
@@ -919,16 +1000,18 @@ endef
 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
 # Usage:
 # $(Q)$(MAKE) $(build)=dir
-build := -f scripts/Makefile.build obj
+build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
 
 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
 # Usage:
 # $(Q)$(MAKE) $(clean)=dir
-clean := -f scripts/Makefile.clean obj
+clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
 
 #	$(call descend,<dir>,<target>)
 #	Recursively call a sub-make in <dir> with target <target>
 # Usage is deprecated, because make does not see this as an invocation of make.
-descend =$(Q)$(MAKE) -f scripts/Makefile.build obj=$(1) $(2)
+descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
+
+endif	# skip-makefile
 
 FORCE:

README

@@ -108,11 +108,26 @@ SOFTWARE REQUIREMENTS
    you can just update packages when obvious problems arise during
    build or operation.
 
-CONFIGURING the kernel:
+BUILD directory for the kernel:
+
+   When compiling the kernel all output files will per default be
+   stored together with the kernel source code.
+   Using the option "make O=output/dir" allow you to specify an alternate
+   place for the output files (including .config).
+   Example:
+     kernel source code:	/usr/src/linux-2.6.N
+     build directory:		/home/name/build/kernel
+
+   To configure and build the kernel use:
+   cd /usr/src/linux-2.6.N
+   make O=/home/name/build/kernel menuconfig
+   make O=/home/name/build/kernel
+   sudo make O=/home/name/build/kernel install_modules install
 
- - Do a "make config" to configure the basic kernel.  "make config" needs
-   bash to work: it will search for bash in $BASH, /bin/bash and /bin/sh
-   (in that order), so one of those must be correct for it to work. 
+   Please note: If the 'O=output/dir' option is used then it must be
+   used for all invocations of make.
+
+CONFIGURING the kernel:
 
    Do not skip this step even if you are only upgrading one minor
    version.  New configuration options are added in each release, and

arch/i386/boot/Makefile

@@ -99,4 +99,4 @@ zlilo: $(BOOTIMAGE)
 	if [ -x /sbin/lilo ]; then /sbin/lilo; else /etc/lilo/install; fi
 
 install: $(BOOTIMAGE)
-	sh $(src)/install.sh $(KERNELRELEASE) $(BOOTIMAGE) System.map "$(INSTALL_PATH)"
+	sh $(srctree)/$(src)/install.sh $(KERNELRELEASE) $< System.map "$(INSTALL_PATH)"

arch/ppc/Makefile

@@ -58,10 +58,6 @@ bzImage: zImage
 $(BOOT_TARGETS): vmlinux
 	$(Q)$(MAKE) $(build)=arch/ppc/boot $@
 
-%_config: arch/ppc/configs/%_defconfig
-	rm -f .config arch/ppc/defconfig
-	cp -f arch/ppc/configs/$(@:config=defconfig) .config
-
 archclean:
 	$(Q)$(MAKE) $(clean)=arch/ppc/boot
 

arch/ppc64/Makefile

@@ -41,10 +41,6 @@ boottarget-$(CONFIG_PPC_ISERIES) := vmlinux.sminitrd vmlinux.initrd vmlinux.sm
 $(boottarget-y): vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 
-%_config: arch/ppc64/configs/%_defconfig
-	rm -f .config arch/ppc64/defconfig
-	cp -f arch/ppc64/configs/$(@:config=defconfig) arch/ppc64/defconfig
-
 bootimage-$(CONFIG_PPC_PSERIES) := zImage
 bootimage-$(CONFIG_PPC_ISERIES) := vmlinux.sm
 BOOTIMAGE := $(bootimage-y)

scripts/Makefile.build

@@ -14,6 +14,16 @@ include $(obj)/Makefile
 
 include scripts/Makefile.lib
 
+ifneq ($(KBUILD_SRC),)
+# Create output directory if not already present
+_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
+
+# Create directories for object files if directory does not exist
+# Needed when obj-y := dir/file.o syntax is used
+_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
+endif
+
+
 ifdef EXTRA_TARGETS
 $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.5. Please fix!)
 endif

scripts/Makefile.clean

@@ -63,4 +63,4 @@ cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
 # Shorthand for $(Q)$(MAKE) scripts/Makefile.clean obj=dir
 # Usage:
 # $(Q)$(MAKE) $(clean)=dir
-clean := -f scripts/Makefile.clean obj
+clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj

scripts/Makefile.lib

@@ -58,6 +58,11 @@ multi-objs   := $(multi-objs-y) $(multi-objs-m)
 # in the local directory
 subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
 
+# $(obj-dirs) is a list of directories that contain object files
+obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
+obj-dirs += $(foreach f,$(host-progs), $(if $(dir $(f)),$(dir $(f))))
+obj-dirs := $(strip $(sort $(filter-out ./,$(obj-dirs))))
+
 # Replace multi-part objects by their individual parts, look at local dir only
 real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
 real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
@@ -107,6 +112,7 @@ multi-used-m	:= $(addprefix $(obj)/,$(multi-used-m))
 multi-objs-y	:= $(addprefix $(obj)/,$(multi-objs-y))
 multi-objs-m	:= $(addprefix $(obj)/,$(multi-objs-m))
 subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym))
+obj-dirs	:= $(addprefix $(obj)/,$(obj-dirs))
 host-progs      := $(addprefix $(obj)/,$(host-progs))
 host-csingle	:= $(addprefix $(obj)/,$(host-csingle))
 host-cmulti	:= $(addprefix $(obj)/,$(host-cmulti))
@@ -129,15 +135,46 @@ depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
 #       where foo and bar are the name of the modules.
 basename_flags = -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F)))
 modname_flags  = $(if $(filter 1,$(words $(modname))),-DKBUILD_MODNAME=$(subst $(comma),_,$(subst -,_,$(modname))))
-c_flags        = -Wp,-MD,$(depfile) $(CFLAGS) $(NOSTDINC_FLAGS) \
-	         $(modkern_cflags) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o) \
-	         $(basename_flags) $(modname_flags)
-a_flags        = -Wp,-MD,$(depfile) $(AFLAGS) $(NOSTDINC_FLAGS)\
-		 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
-hostc_flags    = -Wp,-MD,$(depfile) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS)\
-		 $(HOSTCFLAGS_$(*F).o)
-hostcxx_flags  = -Wp,-MD,$(depfile) $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS)\
-		 $(HOSTCXXFLAGS_$(*F).o)
+
+
+_c_flags       = $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o)
+_a_flags       = $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
+_hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   $(HOSTCFLAGS_$(*F).o)
+_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) $(HOSTCXXFLAGS_$(*F).o)
+
+
+# If building the kernel in a separate objtree expand all occurrences
+# of -Idir to -Idir -I$(srctree)/dir.
+# hereby allowing gcc to locate files in both trees. Local tree first.
+
+ifeq ($(KBUILD_SRC),)
+__c_flags	= $(_c_flags)
+__a_flags	= $(_a_flags)
+__hostc_flags	= $(_hostc_flags)
+__hostcxx_flags	= $(_hostcxx_flags)
+else
+flags = $(foreach o,$($(1)),\
+	$(if $(filter -I%,$(o)),$(patsubst -I%,-I$(srctree)/%,$(o)),$(o)))
+
+# -I$(obj) locate generated .h files
+# -I$(srctree)/$(src) locate .h files in srctree, from generated .c files
+# FIXME: Replace both with specific EXTRA_CFLAGS statements
+__c_flags	= -I$(obj) -I$(srctree)/$(src) $(call flags,_c_flags)
+__a_flags	=                              $(call flags,_a_flags)
+__hostc_flags	= -I$(obj)                     $(call flags,_hostc_flags)
+__hostcxx_flags	=                              $(call flags,_hostcxx_flags)
+endif
+
+c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
+		 $(__c_flags) $(modkern_cflags) \
+		 $(basename_flags) $(modname_flags)
+
+a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
+		 $(__a_flags) $(modkern_aflags)
+
+hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
+hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
+
 ld_flags       = $(LDFLAGS) $(EXTRA_LDFLAGS)
 
 # Finds the multi-part object the current object will be linked into
@@ -225,14 +262,14 @@ if_changed_rule = $(if $(strip $? \
 
 # If quiet is set, only print short version of command
 
-cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
+cmd = @$(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))' &&) $(cmd_$(1))
 
 #	$(call descend,<dir>,<target>)
 #	Recursively call a sub-make in <dir> with target <target> 
 # Usage is deprecated, because make do not see this as an invocation of make.
-descend =$(Q)$(MAKE) -f scripts/Makefile.build obj=$(1) $(2)
+descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
 
 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
 # Usage:
 # $(Q)$(MAKE) $(build)=dir
-build := -f scripts/Makefile.build obj
+build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj

scripts/Makefile.modpost

@@ -35,7 +35,7 @@ targets += $(modules)
 # Compile version info for unresolved symbols
 
 quiet_cmd_cc_o_c = CC      $@
-      cmd_cc_o_c = $(CC) -Wp,-MD,$(depfile) $(CFLAGS) $(CFLAGS_MODULE)	\
+      cmd_cc_o_c = $(CC) $(c_flags) $(CFLAGS_MODULE)	\
 		   -c -o $@ $<
 
 $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE

scripts/kconfig/Makefile

@@ -40,6 +40,9 @@ allmodconfig: $(obj)/conf
 defconfig: $(obj)/conf
 	$< -d arch/$(ARCH)/Kconfig
 
+%_defconfig: $(obj)/conf
+	$(Q)$< -D arch/$(ARCH)/configs/$@ arch/$(ARCH)/Kconfig
+
 # Help text used by make help
 help:
 	@echo  '  oldconfig	  - Update current config utilising a line-oriented program'

scripts/kconfig/conf.c

@@ -26,6 +26,7 @@ enum {
 	set_no,
 	set_random
 } input_mode = ask_all;
+char *defconfig_file;
 
 static int indent = 1;
 static int valid_stdin = 1;
@@ -483,11 +484,12 @@ static void check_conf(struct menu *menu)
 
 int main(int ac, char **av)
 {
+	int i = 1;
 	const char *name;
 	struct stat tmpstat;
 
-	if (ac > 1 && av[1][0] == '-') {
-		switch (av[1][1]) {
+	if (ac > i && av[i][0] == '-') {
+		switch (av[i++][1]) {
 		case 'o':
 			input_mode = ask_new;
 			break;
@@ -498,6 +500,15 @@ int main(int ac, char **av)
 		case 'd':
 			input_mode = set_default;
 			break;
+		case 'D':
+			input_mode = set_default;
+			defconfig_file = av[i++];
+			if (!defconfig_file) {
+				printf("%s: No default config file specified\n",
+					av[0]);
+				exit(1);
+			}
+			break;
 		case 'n':
 			input_mode = set_no;
 			break;
@@ -516,18 +527,21 @@ int main(int ac, char **av)
 			printf("%s [-o|-s] config\n", av[0]);
 			exit(0);
 		}
-		name = av[2];
-	} else
-		name = av[1];
+	}
+  	name = av[i];
+	if (!name) {
+		printf("%s: Kconfig file missing\n", av[0]);
+	}
 	conf_parse(name);
 	//zconfdump(stdout);
 	switch (input_mode) {
 	case set_default:
-		name = conf_get_default_confname();
-		if (conf_read(name)) {
+		if (!defconfig_file)
+			defconfig_file = conf_get_default_confname();
+		if (conf_read(defconfig_file)) {
 			printf("***\n"
 				"*** Can't find default configuration \"%s\"!\n"
-				"***\n", name);
+				"***\n", defconfig_file);
 			exit(1);
 		}
 		break;

scripts/mkspec

@@ -27,7 +27,7 @@ echo "Summary: The Linux Kernel"
 echo "Version: "$VERSION.$PATCHLEVEL.$SUBLEVEL$EXTRAVERSION | sed -e "s/-//g"
 # we need to determine the NEXT version number so that uname and
 # rpm -q will agree
-echo "Release: `. scripts/mkversion`"
+echo "Release: `. $srctree/scripts/mkversion`"
 echo "License: GPL"
 echo "Group: System Environment/Kernel"
 echo "Vendor: The Linux Community"
@@ -45,7 +45,7 @@ echo "%prep"
 echo "%setup -q"
 echo ""
 echo "%build"
-echo "make clean oldconfig all"
+echo "make clean all"
 echo ""
 echo "%install"
 echo 'mkdir -p $RPM_BUILD_ROOT/boot $RPM_BUILD_ROOT/lib $RPM_BUILD_ROOT/lib/modules'