kbuild: KERNELRELEASE is only re-defined when buiding the kernel

export srctree objtree VPATH TOPDIR

nullstring :=

space      := $(nullstring) # end of line

# Take the contents of any files called localversion* and the config

# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be

# careful not to include files twice if building in the source

# directory. LOCALVERSION from the command line override all of this

localver := $(objtree)/localversion* $(srctree)/localversion*

localver := $(sort $(wildcard $(localver)))

# skip backup files (containing '~')

localver := $(foreach f, $(localver), $(if $(findstring ~, $(f)),,$(f)))

LOCALVERSION = $(subst $(space),, \

	       $(shell cat /dev/null $(localver)) \

	       $(patsubst "%",%,$(CONFIG_LOCALVERSION)))

KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)

# 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

		   -ffreestanding

AFLAGS		:= -D__ASSEMBLY__

export	VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \

# Read KERNELRELEASE from .kernelrelease (if it exists)

KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)

export	KERNELRELEASE \

	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

# images. Default is /boot, but you can set it to other values

export	INSTALL_PATH ?= /boot

# If CONFIG_LOCALVERSION_AUTO is set, we automatically perform some tests

# and try to determine if the current source tree is a release tree, of any sort,

# or if is a pure development tree.

#

# A 'release tree' is any tree with a git TAG associated

# with it.  The primary goal of this is to make it safe for a native

# git/CVS/SVN user to build a release tree (i.e, 2.6.9) and also to

# continue developing against the current Linus tree, without having the Linus

# tree overwrite the 2.6.9 tree when installed.

#

# Currently, only git is supported.

# Other SCMs can edit scripts/setlocalversion and add the appropriate

# checks as needed.

ifdef CONFIG_LOCALVERSION_AUTO

	localversion-auto := $(shell $(PERL) $(srctree)/scripts/setlocalversion $(srctree))

	LOCALVERSION := $(LOCALVERSION)$(localversion-auto)

endif

#

# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory

# relocations required by build roots.  This is not defined in the

$(vmlinux-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

localver-full = $(localver)$(localver-auto)

# Store (new) KERNELRELASE string in .kernelrelease

kernelrelease = \

       $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(localver-full)

.kernelrelease: FORCE

	$(Q)rm -f .kernelrelease

	$(Q)echo $(kernelrelease) > .kernelrelease

	$(Q)echo "  Building kernel $(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.

# 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:

prepare3: .kernelrelease

ifneq ($(KBUILD_SRC),)

	@echo '  Using $(srctree) as source for kernel'

	$(Q)if [ -f $(srctree)/.config ]; then \

MRPROPER_DIRS  += include/config include2

MRPROPER_FILES += .config .config.old include/asm .version .old_version \

                  include/linux/autoconf.h include/linux/version.h \

                  Module.symvers tags TAGS cscope*

		  .kernelrelease Module.symvers tags TAGS cscope*

# clean - Delete most, but leave enough to build external modules

#

	@echo  '  tags/TAGS	  - Generate tags file for editors'

	@echo  '  cscope	  - Generate cscope index'

	@echo  '  kernelrelease	  - Output the release version string'

	@echo  '  kernelversion	  - Output the version stored in Makefile'

	@echo  ''

	@echo  'Static analysers'

	@echo  '  buildcheck      - List dangling references to vmlinux discarded sections'

kernelrelease:

	@echo $(KERNELRELEASE)

kernelversion:

	@echo $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)

# FIXME Should go into a make.lib or something 

# ===========================================================================