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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 | VERSION = 1 PATCHLEVEL = 11 SUBLEVEL = 2 EXTRAVERSION = 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. # # 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. # 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 = $(C) endif endif ifndef KBUILD_CHECKSRC KBUILD_CHECKSRC = 0 endif # Use make M=dir to specify directory of external module to build # Old syntax make ... SUBDIRS=$PWD is still supported # Setting the environment variable KBUILD_EXTMOD take precedence ifdef SUBDIRS KBUILD_EXTMOD ?= $(SUBDIRS) endif ifdef M ifeq ("$(origin M)", "command line") KBUILD_EXTMOD := $(M) endif endif # kbuild supports saving output files in a separate directory. # To locate output files in a separate directory two syntaxes are supported. # In both cases the working directory must be the root of the kernel src. # 1) O= # Use "make O=dir/to/store/output/files/" # # 2) Set KBUILD_OUTPUT # Set the environment variable KBUILD_OUTPUT to point to the directory # where the output files shall be placed. # export KBUILD_OUTPUT=dir/to/store/output/files/ # make # # The O= assignment takes precedence over the KBUILD_OUTPUT environment # variable. # KBUILD_SRC is set on invocation of make in OBJ directory # KBUILD_SRC is not intended to be used by the regular user (for now) ifeq ($(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 := $(O) endif endif # That's our default target when none is given on the command line PHONY := _all _all: ifneq ($(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 _all: modules 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 # 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 $(CROSS_COMPILE). # CROSS_COMPILE can be set on the command line # make CROSS_COMPILE=ia64-linux- # Alternatively CROSS_COMPILE can be set in the environment. # Default value for CROSS_COMPILE is not to prefix executables # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile CROSS_COMPILE ?= # bbox: we may have CONFIG_CROSS_COMPILER_PREFIX in .config, # and it has not been included yet... thus using an awkward syntax. ifeq ($(CROSS_COMPILE),) CROSS_COMPILE := $(shell grep ^CONFIG_CROSS_COMPILER_PREFIX .config 2>/dev/null) CROSS_COMPILE := $(subst CONFIG_CROSS_COMPILER_PREFIX=,,$(CROSS_COMPILE)) CROSS_COMPILE := $(subst ",,$(CROSS_COMPILE)) endif # 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. ifneq ($(CROSS_COMPILE),) SUBARCH := $(shell echo $(CROSS_COMPILE) | cut -d- -f1) else SUBARCH := $(shell uname -m) endif SUBARCH := $(shell echo $(SUBARCH) | 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/ ) ARCH ?= $(SUBARCH) # 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) # 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 $([31mCONFIG_MODVERSIONS[0m),1) endif # If we have "make <whatever> modules", compile modules # in addition to whatever we do anyway. # Just "make" or "make all" shall build modules as well ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) KBUILD_MODULES := 1 endif ifeq ($(MAKECMDGOALS),) KBUILD_MODULES := 1 endif 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 # If the user is running make -s (silent mode), suppress echoing of # commands ifneq ($(findstring s,$(MAKEFLAGS)),) quiet=silent_ endif export quiet Q KBUILD_VERBOSE # Look for make include files relative to root of kernel src MAKEFLAGS += --include-dir=$(srctree) HOSTCC = gcc HOSTCXX = g++ HOSTCFLAGS := HOSTCXXFLAGS := # We need some generic definitions include $(srctree)/scripts/Kbuild.include HOSTCFLAGS += $(call hostcc-option,-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer,) HOSTCXXFLAGS += -O2 # For maximum performance (+ possibly random breakage, uncomment # the following) MAKEFLAGS += -rR # Make variables (CC, etc...) AS = $(CROSS_COMPILE)as CC = $(CROSS_COMPILE)gcc LD = $(CC) -nostdlib 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 := $(CFLAGS) # Added only to final link stage of busybox binary CFLAGS_busybox := $(CFLAGS_busybox) CPPFLAGS := $(CPPFLAGS) AFLAGS := $(AFLAGS) LDFLAGS := $(LDFLAGS) LDLIBS := # 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 export FLTFLAGS # 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) $(PATCHLEVEL) endif # To make sure we do not include .config for any of the *config targets # catch them early, and hand them over to scripts/kconfig/Makefile # It is allowed to specify more targets when calling make, including # mixing *config targets and build targets. # For example 'make oldconfig all'. # Detect when mixed targets is specified, and make a second invocation # of make so .config is not included in this case either (for *config). no-dot-config-targets := clean mrproper distclean \ cscope TAGS tags help %docs #bbox# check% is removed from above config-targets := 0 mixed-targets := 0 dot-config := 1 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) dot-config := 0 endif endif ifeq ($(KBUILD_EXTMOD),) ifneq ($(filter config %config,$(MAKECMDGOALS)),) config-targets := 1 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) mixed-targets := 1 endif endif endif ifeq ($(mixed-targets),1) # =========================================================================== # We're called with mixed targets (*config and build targets). # Handle them one by one. %:: FORCE $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ else ifeq ($(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 $(Q)$(MAKE) $(build)=scripts/kconfig $@ $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease else # =========================================================================== # Build targets only - this includes busybox, arch specific targets, clean # targets and others. In general all targets except *config targets. ifeq ($(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/ \ editors/ \ findutils/ \ init/ \ libbb/ \ libpwdgrp/ \ loginutils/ \ miscutils/ \ modutils/ \ networking/ \ networking/libiproute/ \ networking/udhcp/ \ printutils/ \ procps/ \ runit/ \ selinux/ \ shell/ \ sysklogd/ \ util-linux/ \ util-linux/volume_id/ \ endif # KBUILD_EXTMOD ifeq ($(dot-config),1) # In this section, we need .config # Read in dependencies to all Kconfig* files, make sure to run # oldconfig if changes are detected. -include .kconfig.d -include .config # 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: ; # Now we can define CFLAGS etc according to .config include $(srctree)/Makefile.flags # 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 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig else # Dummy target needed, because used as prerequisite include/autoconf.h: ; endif # 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 overridden in the arch makefile all: busybox -include $(srctree)/arch/$(ARCH)/Makefile # 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 += $(NOSTDINC_FLAGS) # Default kernel image to build when no specific target is given. # KBUILD_IMAGE may be overruled on the commandline or # set in the environment # Also any assignments in arch/$(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) # 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__ ?= $(srctree)/scripts/trylink \ "$@" \ "$(CC)" \ "$(CFLAGS) $(CFLAGS_busybox)" \ "$(LDFLAGS) $(EXTRA_LDFLAGS)" \ "$(core-y)" \ "$(libs-y)" \ "$(LDLIBS)" # 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 $(kallsyms.o) # It's a three stage process: # o .tmp_busybox1 has all symbols and sections, but __kallsyms is # empty # Running kallsyms on that gives us .tmp_kallsyms1.o with # the right size - busybox version (uname -v) is updated during this step # o .tmp_busybox2 now has a __kallsyms section of the right size, # but due to the added section, some addresses have shifted. # From here, we generate a correct .tmp_kallsyms2.o # o The correct .tmp_kallsyms2.o is linked into the final busybox. # o Verify that the System.map from busybox matches the map from # .tmp_busybox2, just in case we did not generate kallsyms correctly. # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using # .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a # temporary bypass to allow the kernel to be built while the # maintainers work out what went wrong with kallsyms. ifdef CONFIG_KALLSYMS_EXTRA_PASS last_kallsyms := 3 else last_kallsyms := 2 endif kallsyms.o := .tmp_kallsyms$(last_kallsyms).o 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 # 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 # Generate .S file with all kernel symbols quiet_cmd_kallsyms = KSYM $@ cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \ $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@ .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE $(call if_changed_dep,as_o_S) .tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS) $(call cmd,kallsyms) # .tmp_busybox1 must be complete except kallsyms, so update busybox version .tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE $(call if_changed_rule,ksym_ld) .tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE $(call if_changed,busybox__) .tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE $(call if_changed,busybox__) # 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) .tmp_map%: .tmp_busybox% FORCE ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@ .tmp_map3: .tmp_map2 .tmp_map2: .tmp_map1 endif # ifdef CONFIG_KALLSYMS # busybox image - including updated kernel symbols busybox_unstripped: $(busybox-all) FORCE $(call if_changed_rule,busybox__) $(Q)rm -f .old_version busybox: busybox_unstripped ifeq ($(SKIP_STRIP),y) $(Q)cp $< $@ else $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \ busybox_unstripped -o $@ # strip is confused by PIE executable and does not set exec bits $(Q)chmod a+x $@ endif # 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 _BB_DISABLED_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 = $(KERNELVERSION)$(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 busybox' $(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 # 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 archprepare: prepare1 scripts_basic prepare0: archprepare FORCE $(Q)$(MAKE) $(build)=. # All the preparing.. prepare prepare-all: prepare0 # Leave this as default for preprocessing busybox.lds.S, which is now # done in arch/$(ARCH)/kernel/Makefile 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/* quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs > include/bbconfigopts.h quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/* cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config #bbox# piggybacked generation of few .h files include/config/MARKER: scripts/basic/split-include include/autoconf.h $(call cmd,split_autoconf) $(call cmd,gen_bbconfigopts) @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 _BB_DISABLED_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 # [31mCONFIG_MODULES[0m # Modules not configured # --------------------------------------------------------------------------- modules modules_install: FORCE @echo @echo "The present busybox configuration has modules disabled." @echo "Type 'make config' and enable loadable module support." @echo "Then build a kernel with module support enabled." @echo @exit 1 endif # [31mCONFIG_MODULES[0m ### # 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 busybox_unstripped* System.map .kernelrelease \ .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 \ include/bbconfigopts.h \ include/usage_compressed.h \ include/applet_tables.h \ applets/usage \ .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_,scripts) PHONY += $(mrproper-dirs) mrproper archmrproper $(mrproper-dirs): $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) mrproper: clean archmrproper $(mrproper-dirs) $(call cmd,rmdirs) $(call cmd,rmfiles) # distclean # PHONY += distclean distclean: mrproper @find $(srctree) $(RCS_FIND_IGNORE) \ \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \ -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ -type f -print | xargs rm -f # Packaging of the kernel to various formats # --------------------------------------------------------------------------- # rpm target kept for backward compatibility package-dir := $(srctree)/scripts/package %pkg: FORCE $(Q)$(MAKE) $(build)=$(package-dir) $@ rpm: FORCE $(Q)$(MAKE) $(build)=$(package-dir) $@ # Brief documentation of the typical targets used # --------------------------------------------------------------------------- boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig) boards := $(notdir $(boards)) -include $(srctree)/Makefile.help # 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 $$CTAGSF -a endef tags: FORCE $(call cmd,tags) # Scripts to check various things for consistency # --------------------------------------------------------------------------- includecheck: find * $(RCS_FIND_IGNORE) \ -name '*.[hcS]' -type f -print | sort \ | xargs $(PERL) -w scripts/checkincludes.pl versioncheck: find * $(RCS_FIND_IGNORE) \ -name '*.[hcS]' -type f -print | sort \ | xargs $(PERL) -w scripts/checkversion.pl namespacecheck: $(PERL) $(srctree)/scripts/namespace.pl endif #ifeq ($(config-targets),1) endif #ifeq ($(mixed-targets),1) PHONY += checkstack checkstack: $(OBJDUMP) -d busybox $$(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 $([31mCONFIG_MODULES[0m),1) \ $(build)=$(build-dir) %.ko: prepare scripts FORCE $(Q)$(MAKE) KBUILD_MODULES=$(if $([31mCONFIG_MODULES[0m),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 $(srctree)/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) |