Makefile

boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
boards := $(notdir $(boards))

help:
	@echo  'Cleaning targets:'
	@echo  '  clean		  - remove most generated files but keep the config'
	@echo  '  mrproper	  - remove all generated files + config + various backup files'
	@echo  ''
	@echo  'Configuration targets:'
	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
	@echo  ''
	@echo  'Other generic targets:'
	@echo  '  all		  - Build all targets marked with [*]'
	@echo  '* vmlinux	  - Build the bare kernel'
	@echo  '* modules	  - Build all modules'
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
	@echo  '  dir/            - Build all files in dir and below'
	@echo  '  dir/file.[ois]  - Build specified target only'
	@echo  '  dir/file.ko     - Build module including final link'
	@echo  '  rpm		  - Build a kernel as an RPM package'
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
	@echo  '  kernelrelease	  - Output the release version string'
	@echo  '  kernelversion	  - Output the version stored in Makefile'
	@echo  ''
	@echo  'Static analysers'
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
	@echo  ''
	@echo  'Kernel packaging:'
	@$(MAKE) $(build)=$(package-dir) help
	@echo  ''
	@echo  'Documentation targets:'
	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
	@echo  ''
	@echo  'Architecture specific targets ($(ARCH)):'
	@$(if $(archhelp),$(archhelp),\
		echo '  No architecture specific help defined for $(ARCH)')
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		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 $$CHECK (sparse)'
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


# 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

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
# ---------------------------------------------------------------------------

#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!

ifeq ($(src),$(obj))
__srctree =
else
__srctree = $(srctree)/
endif

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 vmlinux $$(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:


# 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)