8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
13 # Do not print "Entering directory ..."
14 MAKEFLAGS += --no-print-directory
16 # We are using a recursive build, so we need to do a little thinking
17 # to get the ordering right.
19 # Most importantly: sub-Makefiles should only ever modify files in
20 # their own directory. If in some directory we have a dependency on
21 # a file in another dir (which doesn't happen often, but it's often
22 # unavoidable when linking the built-in.o targets which finally
23 # turn into busybox), we will call a sub make in that other dir, and
24 # after that we are sure that everything which is in that other dir
27 # The only cases where we need to modify files which have global
28 # effects are thus separated out and done before the recursive
29 # descending is started. They are now explicitly listed as the
32 # To put more focus on warnings, be less verbose as default
33 # Use 'make V=1' to see the full commands
36 ifeq ("$(origin V)", "command line")
44 # Call sparse as part of compilation of C files
45 # Use 'make C=1' to enable sparse checking
48 ifeq ("$(origin C)", "command line")
49 KBUILD_CHECKSRC = $(C)
52 ifndef KBUILD_CHECKSRC
56 # Use make M=dir to specify directory of external module to build
57 # Old syntax make ... SUBDIRS=$PWD is still supported
58 # Setting the environment variable KBUILD_EXTMOD take precedence
60 KBUILD_EXTMOD ?= $(SUBDIRS)
63 ifeq ("$(origin M)", "command line")
69 # kbuild supports saving output files in a separate directory.
70 # To locate output files in a separate directory two syntaxes are supported.
71 # In both cases the working directory must be the root of the kernel src.
73 # Use "make O=dir/to/store/output/files/"
75 # 2) Set KBUILD_OUTPUT
76 # Set the environment variable KBUILD_OUTPUT to point to the directory
77 # where the output files shall be placed.
78 # export KBUILD_OUTPUT=dir/to/store/output/files/
81 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
85 # KBUILD_SRC is set on invocation of make in OBJ directory
86 # KBUILD_SRC is not intended to be used by the regular user (for now)
89 # OK, Make called in directory where kernel src resides
90 # Do we want to locate output files in a separate directory?
92 ifeq ("$(origin O)", "command line")
97 # That's our default target when none is given on the command line
101 ifneq ($(KBUILD_OUTPUT),)
102 # Invoke a second make in the output directory, passing relevant variables
103 # check that the output directory actually exists
104 saved-output := $(KBUILD_OUTPUT)
105 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
106 $(if $(KBUILD_OUTPUT),, \
107 $(error output directory "$(saved-output)" does not exist))
109 PHONY += $(MAKECMDGOALS)
111 $(filter-out _all,$(MAKECMDGOALS)) _all:
112 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
113 KBUILD_SRC=$(CURDIR) \
114 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
116 # Leave processing to above invocation of make
118 endif # ifneq ($(KBUILD_OUTPUT),)
119 endif # ifeq ($(KBUILD_SRC),)
121 # We process the rest of the Makefile if this is the final invocation of make
122 ifeq ($(skip-makefile),)
124 # If building an external module we do not care about the all: rule
125 # but instead _all depend on modules
127 ifeq ($(KBUILD_EXTMOD),)
133 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
135 # FIXME - TOPDIR is obsolete, use srctree/objtree
140 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
142 export srctree objtree VPATH TOPDIR
145 # Cross compiling and selecting different set of gcc/bin-utils
146 # ---------------------------------------------------------------------------
148 # When performing cross compilation for other architectures ARCH shall be set
149 # to the target architecture. (See arch/* for the possibilities).
150 # ARCH can be set during invocation of make:
152 # Another way is to have ARCH set in the environment.
153 # The default ARCH is the host where make is executed.
155 # CROSS_COMPILE specify the prefix used for all executables used
156 # during compilation. Only gcc and related bin-utils executables
157 # are prefixed with $(CROSS_COMPILE).
158 # CROSS_COMPILE can be set on the command line
159 # make CROSS_COMPILE=ia64-linux-
160 # Alternatively CROSS_COMPILE can be set in the environment.
161 # Default value for CROSS_COMPILE is not to prefix executables
162 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
165 # bbox: we may have CONFIG_CROSS_COMPILER_PREFIX in .config,
166 # and it has not been included yet... thus using an awkward syntax.
167 ifeq ($(CROSS_COMPILE),)
168 CROSS_COMPILE := $(shell grep ^CONFIG_CROSS_COMPILER_PREFIX .config 2>/dev/null)
169 CROSS_COMPILE := $(subst CONFIG_CROSS_COMPILER_PREFIX=,,$(CROSS_COMPILE))
170 CROSS_COMPILE := $(subst ",,$(CROSS_COMPILE))
174 # SUBARCH tells the usermode build what the underlying arch is. That is set
175 # first, and if a usermode build is happening, the "ARCH=um" on the command
176 # line overrides the setting of ARCH below. If a native build is happening,
177 # then ARCH is assigned, getting whatever value it gets normally, and
178 # SUBARCH is subsequently ignored.
180 ifneq ($(CROSS_COMPILE),)
181 SUBARCH := $(shell echo $(CROSS_COMPILE) | cut -d- -f1 | sed 's:^.*/::g')
183 SUBARCH := $(shell uname -m)
185 SUBARCH := $(shell echo $(SUBARCH) | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
186 -e s/arm.*/arm/ -e s/sa110/arm/ \
187 -e s/s390x/s390/ -e s/parisc64/parisc/ \
188 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
192 # Architecture as present in compile.h
193 UTS_MACHINE := $(ARCH)
195 # SHELL used by kbuild
196 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
197 else if [ -x /bin/bash ]; then echo /bin/bash; \
198 else echo sh; fi ; fi)
200 # Decide whether to build built-in, modular, or both.
201 # Normally, just do built-in.
206 # If we have only "make modules", don't compile built-in objects.
207 # When we're building modules with modversions, we need to consider
208 # the built-in objects during the descend as well, in order to
209 # make sure the checksums are uptodate before we record them.
211 ifeq ($(MAKECMDGOALS),modules)
212 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
215 # If we have "make <whatever> modules", compile modules
216 # in addition to whatever we do anyway.
217 # Just "make" or "make all" shall build modules as well
219 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
223 ifeq ($(MAKECMDGOALS),)
227 export KBUILD_MODULES KBUILD_BUILTIN
228 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
231 # ---------------------------------------------------------------------------
233 # Normally, we echo the whole command before executing it. By making
234 # that echo $($(quiet)$(cmd)), we now have the possibility to set
235 # $(quiet) to choose other forms of output instead, e.g.
237 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
238 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
240 # If $(quiet) is empty, the whole command will be printed.
241 # If it is set to "quiet_", only the short version will be printed.
242 # If it is set to "silent_", nothing wil be printed at all, since
243 # the variable $(silent_cmd_cc_o_c) doesn't exist.
245 # A simple variant is to prefix commands with $(Q) - that's useful
246 # for commands that shall be hidden in non-verbose mode.
250 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
251 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
253 ifeq ($(KBUILD_VERBOSE),1)
261 # If the user is running make -s (silent mode), suppress echoing of
264 ifneq ($(findstring s,$(MAKEFLAGS)),)
268 export quiet Q KBUILD_VERBOSE
271 # Look for make include files relative to root of kernel src
272 MAKEFLAGS += --include-dir=$(srctree)
278 # We need some generic definitions
279 include $(srctree)/scripts/Kbuild.include
281 HOSTCFLAGS += $(call hostcc-option,-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer,)
284 # For maximum performance (+ possibly random breakage, uncomment
289 # Make variables (CC, etc...)
291 AS = $(CROSS_COMPILE)as
292 CC = $(CROSS_COMPILE)gcc
295 AR = $(CROSS_COMPILE)ar
296 NM = $(CROSS_COMPILE)nm
297 STRIP = $(CROSS_COMPILE)strip
298 OBJCOPY = $(CROSS_COMPILE)objcopy
299 OBJDUMP = $(CROSS_COMPILE)objdump
300 PKG_CONFIG ?= $(CROSS_COMPILE)pkg-config
302 GENKSYMS = scripts/genksyms/genksyms
303 DEPMOD = /sbin/depmod
304 KALLSYMS = scripts/kallsyms
308 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
310 CFLAGS_MODULE = $(MODFLAGS)
311 AFLAGS_MODULE = $(MODFLAGS)
317 # Use LINUXINCLUDE when you must reference the include/ directory.
318 # Needed to be compatible with the O= option
320 # Added only to final link stage of busybox binary
321 CFLAGS_busybox := $(CFLAGS_busybox)
322 CPPFLAGS := $(CPPFLAGS)
324 LDFLAGS := $(LDFLAGS)
327 # Read KERNELRELEASE from .kernelrelease (if it exists)
328 KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
329 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
331 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
332 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
333 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
334 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
336 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
337 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
338 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
341 # When compiling out-of-tree modules, put MODVERDIR in the module
342 # tree rather than in the kernel tree. The kernel tree might
344 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
346 # Files to ignore in find ... statements
348 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
349 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
351 # ===========================================================================
352 # Rules shared between *config targets and build targets
354 # Basic helpers built in scripts/
355 PHONY += scripts_basic
357 $(Q)$(MAKE) $(build)=scripts/basic
359 # To avoid any implicit rule to kick in, define an empty command.
360 scripts/basic/%: scripts_basic ;
362 # This target generates Kbuild's and Config.in's from *.c files
363 PHONY += gen_build_files
364 gen_build_files: $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c) $(wildcard embed/*)
365 $(Q)$(srctree)/scripts/gen_build_files.sh $(srctree) $(objtree)
367 # bbox: we have helpers in applets/
368 # we depend on scripts_basic, since scripts/basic/fixdep
369 # must be built before any other host prog
371 applets_dir: scripts_basic gen_build_files include/config/MARKER
372 $(Q)$(MAKE) $(build)=applets
374 applets/%: applets_dir ;
376 PHONY += outputmakefile
377 # outputmakefile generates a Makefile in the output directory, if using a
378 # separate output directory. This allows convenient use of make in the
381 ifneq ($(KBUILD_SRC),)
382 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
383 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
386 # To make sure we do not include .config for any of the *config targets
387 # catch them early, and hand them over to scripts/kconfig/Makefile
388 # It is allowed to specify more targets when calling make, including
389 # mixing *config targets and build targets.
390 # For example 'make oldconfig all'.
391 # Detect when mixed targets is specified, and make a second invocation
392 # of make so .config is not included in this case either (for *config).
394 no-dot-config-targets := clean mrproper distclean \
395 cscope TAGS tags help %docs
396 #bbox# check% is removed from above
402 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
403 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
408 ifeq ($(KBUILD_EXTMOD),)
409 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
411 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
417 ifeq ($(mixed-targets),1)
418 # ===========================================================================
419 # We're called with mixed targets (*config and build targets).
420 # Handle them one by one.
423 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
426 ifeq ($(config-targets),1)
427 # ===========================================================================
428 # *config targets only - make sure prerequisites are updated, and descend
429 # in scripts/kconfig to make the *config target
431 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
432 # KBUILD_DEFCONFIG may point out an alternative default configuration
433 # used for 'make defconfig'
434 -include $(srctree)/arch/$(ARCH)/Makefile
435 export KBUILD_DEFCONFIG
437 config: scripts_basic outputmakefile gen_build_files FORCE
439 $(Q)$(MAKE) $(build)=scripts/kconfig $@
440 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
442 %config: scripts_basic outputmakefile gen_build_files FORCE
444 $(Q)$(MAKE) $(build)=scripts/kconfig $@
445 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
448 # ===========================================================================
449 # Build targets only - this includes busybox, arch specific targets, clean
450 # targets and others. In general all targets except *config targets.
452 ifeq ($(KBUILD_EXTMOD),)
453 # Additional helpers built in scripts/
454 # Carefully list dependencies so we do not try to build scripts twice
457 scripts: gen_build_files scripts_basic include/config/MARKER
458 $(Q)$(MAKE) $(build)=$(@)
460 scripts_basic: include/autoconf.h
462 # Objects we will link into busybox / subdirs we need to visit
468 archival/libarchive/ \
471 coreutils/libcoreutils/ \
485 networking/libiproute/ \
494 util-linux/volume_id/ \
496 endif # KBUILD_EXTMOD
498 ifeq ($(dot-config),1)
499 # In this section, we need .config
501 # Read in dependencies to all Kconfig* files, make sure to run
502 # oldconfig if changes are detected.
507 # If .config needs to be updated, it will be done via the dependency
508 # that autoconf has on .config.
509 # To avoid any implicit rule to kick in, define an empty command
510 .config .kconfig.d: ;
512 -include $(srctree)/arch/$(ARCH)/Makefile
514 # Now we can define CFLAGS etc according to .config
515 include $(srctree)/Makefile.flags
517 # If .config is newer than include/autoconf.h, someone tinkered
518 # with it and forgot to run make oldconfig.
519 # If kconfig.d is missing then we are probarly in a cleaned tree so
520 # we execute the config step to be sure to catch updated Kconfig files
521 include/autoconf.h: .kconfig.d .config $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c) | gen_build_files
522 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
524 include/usage.h: gen_build_files
527 # Dummy target needed, because used as prerequisite
528 include/autoconf.h: ;
531 # The all: target is the default when no target is given on the
533 # This allow a user to issue only 'make' to build a kernel including modules
534 # Defaults busybox but it is usually overridden in the arch makefile
537 # arch Makefile may override CC so keep this after arch Makefile is included
538 #bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
539 CHECKFLAGS += $(NOSTDINC_FLAGS)
541 # Default kernel image to build when no specific target is given.
542 # KBUILD_IMAGE may be overruled on the commandline or
543 # set in the environment
544 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
546 export KBUILD_IMAGE ?= busybox
549 # INSTALL_PATH specifies where to place the updated kernel and system map
550 # images. Default is /boot, but you can set it to other values
551 export INSTALL_PATH ?= /boot
554 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
555 # relocations required by build roots. This is not defined in the
556 # makefile but the argument can be passed to make if needed.
559 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
563 ifeq ($(KBUILD_EXTMOD),)
564 busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
566 busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
567 $(core-n) $(core-) $(libs-n) $(libs-) \
570 core-y := $(patsubst %/, %/built-in.o, $(core-y))
571 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
572 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
573 libs-y := $(libs-y1) $(libs-y2)
576 # ---------------------------------------------------------------------------
577 # busybox is build from the objects selected by $(busybox-init) and
578 # $(busybox-main). Most are built-in.o files from top-level directories
579 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
580 # Ordering when linking is important, and $(busybox-init) must be first.
585 # +-< $(busybox-init)
586 # | +--< init/version.o + more
588 # +--< $(busybox-main)
589 # | +--< driver/built-in.o mm/built-in.o + more
591 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
593 # busybox version (uname -v) cannot be updated during normal
594 # descending-into-subdirs phase since we do not yet know if we need to
596 # Therefore this step is delayed until just before final link of busybox -
597 # except in the kallsyms case where it is done just before adding the
598 # symbols to the kernel.
600 # System.map is generated to document addresses of all kernel symbols
602 busybox-all := $(core-y) $(libs-y)
604 # Rule to link busybox - also used during CONFIG_KALLSYMS
605 # May be overridden by arch/$(ARCH)/Makefile
606 quiet_cmd_busybox__ ?= LINK $@
607 cmd_busybox__ ?= $(srctree)/scripts/trylink \
610 "$(CFLAGS) $(CFLAGS_busybox)" \
611 "$(LDFLAGS) $(EXTRA_LDFLAGS)" \
615 && $(srctree)/scripts/generate_BUFSIZ.sh --post include/common_bufsiz.h
617 # Generate System.map
618 quiet_cmd_sysmap = SYSMAP
619 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
622 # If CONFIG_KALLSYMS is set .version is already updated
623 # Generate System.map and verify that the content is consistent
624 # Use + in front of the busybox_version rule to silent warning with make -j2
625 # First command is ':' to allow us to use + in front of the rule
626 define rule_busybox__
628 $(call cmd,busybox__)
629 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
633 ifdef CONFIG_KALLSYMS
634 # Generate section listing all symbols and add it into busybox $(kallsyms.o)
635 # It's a three stage process:
636 # o .tmp_busybox1 has all symbols and sections, but __kallsyms is
638 # Running kallsyms on that gives us .tmp_kallsyms1.o with
639 # the right size - busybox version (uname -v) is updated during this step
640 # o .tmp_busybox2 now has a __kallsyms section of the right size,
641 # but due to the added section, some addresses have shifted.
642 # From here, we generate a correct .tmp_kallsyms2.o
643 # o The correct .tmp_kallsyms2.o is linked into the final busybox.
644 # o Verify that the System.map from busybox matches the map from
645 # .tmp_busybox2, just in case we did not generate kallsyms correctly.
646 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
647 # .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a
648 # temporary bypass to allow the kernel to be built while the
649 # maintainers work out what went wrong with kallsyms.
651 ifdef CONFIG_KALLSYMS_EXTRA_PASS
657 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
659 define verify_kallsyms
660 $(Q)$(if $($(quiet)cmd_sysmap), \
661 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
662 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
663 $(Q)cmp -s System.map .tmp_System.map || \
664 (echo Inconsistent kallsyms data; \
665 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
666 rm .tmp_kallsyms* ; /bin/false )
669 # Update busybox version before link
670 # Use + in front of this rule to silent warning about make -j1
671 # First command is ':' to allow us to use + in front of this rule
672 cmd_ksym_ld = $(cmd_busybox__)
675 +$(call cmd,busybox_version)
676 $(call cmd,busybox__)
677 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
680 # Generate .S file with all kernel symbols
681 quiet_cmd_kallsyms = KSYM $@
682 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
683 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
685 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
686 $(call if_changed_dep,as_o_S)
688 .tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
691 # .tmp_busybox1 must be complete except kallsyms, so update busybox version
692 .tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
693 $(call if_changed_rule,ksym_ld)
695 .tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
696 $(call if_changed,busybox__)
698 .tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
699 $(call if_changed,busybox__)
701 # Needs to visit scripts/ before $(KALLSYMS) can be used.
702 $(KALLSYMS): scripts ;
704 # Generate some data for debugging strange kallsyms problems
705 debug_kallsyms: .tmp_map$(last_kallsyms)
707 .tmp_map%: .tmp_busybox% FORCE
708 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
714 endif # ifdef CONFIG_KALLSYMS
716 # busybox image - including updated kernel symbols
717 busybox_unstripped: $(busybox-all) FORCE
718 $(call if_changed_rule,busybox__)
719 $(Q)rm -f .old_version
721 busybox: busybox_unstripped
722 ifeq ($(SKIP_STRIP),y)
725 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
726 busybox_unstripped -o $@
727 # strip is confused by PIE executable and does not set exec bits
731 # The actual objects are generated when descending,
732 # make sure no implicit rule kicks in
733 $(sort $(busybox-all)): $(busybox-dirs) ;
735 # Handle descending into subdirectories listed in $(busybox-dirs)
736 # Preset locale variables to speed up the build process. Limit locale
737 # tweaks to this spot to avoid wrong language settings when running
738 # make menuconfig etc.
739 # Error messages still appears in the original language
741 PHONY += $(busybox-dirs)
742 $(busybox-dirs): prepare scripts
743 $(Q)$(MAKE) $(build)=$@
745 # Build the kernel release string
746 # The KERNELRELEASE is stored in a file named .kernelrelease
747 # to be used when executing for example make install or make modules_install
749 # Take the contents of any files called localversion* and the config
750 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
751 # LOCALVERSION from the command line override all of this
754 space := $(nullstring) # end of line
756 ___localver = $(objtree)/localversion* $(srctree)/localversion*
757 __localver = $(sort $(wildcard $(___localver)))
758 # skip backup files (containing '~')
759 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
761 localver = $(subst $(space),, \
762 $(shell cat /dev/null $(_localver)) \
763 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
765 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
766 # and if the SCM is know a tag from the SCM is appended.
767 # The appended tag is determinded by the SCM used.
769 # Currently, only git is supported.
770 # Other SCMs can edit scripts/setlocalversion and add the appropriate
772 ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO
773 _localver-auto = $(shell $(CONFIG_SHELL) \
774 $(srctree)/scripts/setlocalversion $(srctree))
775 localver-auto = $(LOCALVERSION)$(_localver-auto)
778 localver-full = $(localver)$(localver-auto)
780 # Store (new) KERNELRELASE string in .kernelrelease
781 kernelrelease = $(KERNELVERSION)$(localver-full)
782 .kernelrelease: FORCE
784 $(Q)echo $(kernelrelease) > $@
787 # Things we need to do before we recursively start building the kernel
788 # or the modules are listed in "prepare".
789 # A multi level approach is used. prepareN is processed before prepareN-1.
790 # archprepare is used in arch Makefiles and when processed asm symlink,
791 # version.h and scripts_basic is processed / created.
793 # Listed in dependency order
794 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
796 # prepare-all is deprecated, use prepare as valid replacement
799 # prepare3 is used to check if we are building in a separate output directory,
801 # 1) Check that make has not been executed in the kernel src $(srctree)
802 # 2) Create the include2 directory, used for the second asm symlink
803 prepare3: .kernelrelease
804 ifneq ($(KBUILD_SRC),)
805 @echo ' Using $(srctree) as source for busybox'
806 $(Q)if [ -f $(srctree)/.config ]; then \
807 echo " $(srctree) is not clean, please run 'make mrproper'";\
808 echo " in the '$(srctree)' directory.";\
811 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
812 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
815 # prepare2 creates a makefile if using a separate output directory
816 prepare2: prepare3 outputmakefile
818 prepare1: prepare2 include/config/MARKER
819 ifneq ($(KBUILD_MODULES),)
820 $(Q)mkdir -p $(MODVERDIR)
821 $(Q)rm -f $(MODVERDIR)/*
824 archprepare: prepare1 scripts_basic applets_dir
826 prepare0: archprepare FORCE
827 $(Q)$(MAKE) $(build)=.
829 # All the preparing..
830 prepare prepare-all: prepare0
832 # Leave this as default for preprocessing busybox.lds.S, which is now
833 # done in arch/$(ARCH)/kernel/Makefile
835 export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
837 # FIXME: The asm symlink changes when $(ARCH) changes. That's
838 # hard to detect, but I suppose "make mrproper" is a good idea
839 # before switching between archs anyway.
842 #bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
843 #bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
844 #bbox# @ln -fsn asm-$(ARCH) $@
846 # Split autoconf.h into include/linux/config/*
847 quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h
848 cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs include/bbconfigopts.h include/bbconfigopts_bz2.h
849 quiet_cmd_gen_common_bufsiz = GEN include/common_bufsiz.h
850 cmd_gen_common_bufsiz = $(srctree)/scripts/generate_BUFSIZ.sh include/common_bufsiz.h
851 quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/*
852 cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config
853 quiet_cmd_gen_embedded_scripts = GEN include/embedded_scripts.h
854 cmd_gen_embedded_scripts = $(srctree)/scripts/embedded_scripts include/embedded_scripts.h $(srctree)/embed $(srctree)/applets_sh
855 #bbox# piggybacked generation of few .h files
856 include/config/MARKER: scripts/basic/split-include include/autoconf.h $(wildcard embed/*) scripts/embedded_scripts
857 $(call cmd,split_autoconf)
858 $(call cmd,gen_bbconfigopts)
859 $(call cmd,gen_common_bufsiz)
860 $(call cmd,gen_embedded_scripts)
863 # Generate some files
864 # ---------------------------------------------------------------------------
866 # KERNELRELEASE can change from a few different places, meaning version.h
867 # needs to be updated, so this check is forced on all builds
871 define filechk_version.h
872 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
873 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
876 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
877 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
878 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
882 # ---------------------------------------------------------------------------
886 @echo '*** Warning: make $@ is unnecessary now.'
888 # ---------------------------------------------------------------------------
891 ifdef _BB_DISABLED_CONFIG_MODULES
893 # By default, build modules as well
900 modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
901 @echo ' Building modules, stage 2.';
902 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
905 # Target to prepare building external modules
906 PHONY += modules_prepare
907 modules_prepare: prepare scripts
909 # Target to install modules
910 PHONY += modules_install
911 modules_install: _modinst_ _modinst_post
915 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
916 echo "Warning: you may need to install module-init-tools"; \
917 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
920 @rm -rf $(MODLIB)/kernel
921 @rm -f $(MODLIB)/source
922 @mkdir -p $(MODLIB)/kernel
923 @ln -s $(srctree) $(MODLIB)/source
924 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
925 rm -f $(MODLIB)/build ; \
926 ln -s $(objtree) $(MODLIB)/build ; \
928 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
930 # If System.map exists, run depmod. This deliberately does not have a
931 # dependency on System.map since that would run the dependency tree on
932 # busybox. This depmod is only for convenience to give the initial
933 # boot a modules.dep even before / is mounted read-write. However the
934 # boot script depmod is the master version.
935 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
938 depmod_opts := -b $(INSTALL_MOD_PATH) -r
940 PHONY += _modinst_post
941 _modinst_post: _modinst_
942 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
944 else # CONFIG_MODULES
946 # Modules not configured
947 # ---------------------------------------------------------------------------
949 modules modules_install: FORCE
951 @echo "The present busybox configuration has modules disabled."
952 @echo "Type 'make config' and enable loadable module support."
953 @echo "Then build a kernel with module support enabled."
957 endif # CONFIG_MODULES
960 # Cleaning is done on three levels.
961 # make clean Delete most generated files
962 # Leave enough to build external modules
963 # make mrproper Delete the current configuration, and all generated files
964 # make distclean Remove editor backup files, patch leftover files and the like
966 # Directories & files removed with 'make clean'
967 CLEAN_DIRS += $(MODVERDIR) _install 0_lib
968 CLEAN_FILES += busybox busybox_unstripped* busybox.links \
969 System.map .kernelrelease \
970 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
972 # Directories & files removed with 'make mrproper'
973 MRPROPER_DIRS += include/config include2
974 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
975 include/NUM_APPLETS.h \
976 include/common_bufsiz.h \
978 include/bbconfigopts.h \
979 include/bbconfigopts_bz2.h \
980 include/embedded_scripts.h \
981 include/usage_compressed.h \
982 include/applet_tables.h \
986 .kernelrelease Module.symvers tags TAGS cscope* \
989 # clean - Delete most, but leave enough to build external modules
991 clean: rm-dirs := $(CLEAN_DIRS)
992 clean: rm-files := $(CLEAN_FILES)
993 clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
995 PHONY += $(clean-dirs) clean archclean
997 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
999 clean: archclean $(clean-dirs)
1002 @find . $(RCS_FIND_IGNORE) \
1003 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1004 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1005 -type f -print | xargs rm -f
1008 doc-clean: rm-files := docs/busybox.pod \
1009 docs/BusyBox.html docs/busybox.1 docs/BusyBox.txt
1013 # mrproper - Delete all generated files, including .config
1015 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1016 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1017 mrproper-dirs := $(addprefix _mrproper_,scripts)
1019 PHONY += $(mrproper-dirs) mrproper archmrproper
1021 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1023 mrproper: clean archmrproper $(mrproper-dirs)
1026 @find . -name Config.src | sed 's/.src$$/.in/' | xargs -r rm -f
1027 @find . -name Kbuild.src | sed 's/.src$$//' | xargs -r rm -f
1034 @find $(srctree) $(RCS_FIND_IGNORE) \
1035 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1036 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1037 -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \
1038 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1039 -type f -print | xargs rm -f
1042 # Packaging of the kernel to various formats
1043 # ---------------------------------------------------------------------------
1044 # rpm target kept for backward compatibility
1045 package-dir := $(srctree)/scripts/package
1048 $(Q)$(MAKE) $(build)=$(package-dir) $@
1050 $(Q)$(MAKE) $(build)=$(package-dir) $@
1053 # Brief documentation of the typical targets used
1054 # ---------------------------------------------------------------------------
1056 boards := $(wildcard $(srctree)/configs/*_defconfig)
1057 boards := $(notdir $(boards))
1059 -include $(srctree)/Makefile.help
1061 # Documentation targets
1062 # ---------------------------------------------------------------------------
1063 %docs: scripts_basic FORCE
1064 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1066 else # KBUILD_EXTMOD
1069 # External module support.
1070 # When building external modules the kernel used as basis is considered
1071 # read-only, and no consistency checks are made and the make
1072 # system is not used on the basis kernel. If updates are required
1073 # in the basis kernel ordinary make commands (without M=...) must
1076 # The following are the only valid targets when building external
1078 # make M=dir clean Delete all automatically generated files
1079 # make M=dir modules Make all modules in specified dir
1080 # make M=dir Same as 'make M=dir modules'
1081 # make M=dir modules_install
1082 # Install the modules build in the module directory
1083 # Assumes install directory is already created
1085 # We are always building modules
1087 PHONY += crmodverdir
1089 $(Q)mkdir -p $(MODVERDIR)
1090 $(Q)rm -f $(MODVERDIR)/*
1092 PHONY += $(objtree)/Module.symvers
1093 $(objtree)/Module.symvers:
1094 @test -e $(objtree)/Module.symvers || ( \
1096 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1097 echo " is missing; modules will have no dependencies and modversions."; \
1100 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1101 PHONY += $(module-dirs) modules
1102 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1103 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1105 modules: $(module-dirs)
1106 @echo ' Building modules, stage 2.';
1107 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1109 PHONY += modules_install
1110 modules_install: _emodinst_ _emodinst_post
1112 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1115 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1116 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1118 # Run depmod only is we have System.map and depmod is executable
1119 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1120 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1121 $(DEPMOD) -ae -F System.map \
1122 $(if $(strip $(INSTALL_MOD_PATH)), \
1123 -b $(INSTALL_MOD_PATH) -r) \
1127 PHONY += _emodinst_post
1128 _emodinst_post: _emodinst_
1131 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1133 PHONY += $(clean-dirs) clean
1135 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1137 clean: rm-dirs := $(MODVERDIR)
1138 clean: $(clean-dirs)
1140 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1141 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1142 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1143 -type f -print | xargs rm -f
1146 PHONY += prepare scripts
1149 endif # KBUILD_EXTMOD
1151 # Generate tags for editors
1152 # ---------------------------------------------------------------------------
1154 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1155 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1156 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1158 ifeq ($(src),$(obj))
1161 __srctree = $(srctree)/
1164 ifeq ($(ALLSOURCE_ARCHS),)
1166 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1168 ALLINCLUDE_ARCHS := $(ARCH)
1171 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1172 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1175 ALLSOURCE_ARCHS := $(ARCH)
1178 ( find -regex '.*\.[ch]$$' )
1181 quiet_cmd_cscope-file = FILELST cscope.files
1182 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1184 quiet_cmd_cscope = MAKE cscope.out
1185 cmd_cscope = cscope -b
1188 $(call cmd,cscope-file)
1191 quiet_cmd_TAGS = MAKE $@
1194 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
1195 echo "-I __initdata,__exitdata,__acquires,__releases \
1196 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1197 --extra=+f --c-kinds=+px"`; \
1198 $(all-sources) | xargs etags $$ETAGSF -a
1205 quiet_cmd_tags = MAKE $@
1208 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
1209 echo "-I __initdata,__exitdata,__acquires,__releases \
1210 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1211 --extra=+f --c-kinds=+px"`; \
1212 $(all-sources) | xargs ctags $$CTAGSF -a
1219 # Scripts to check various things for consistency
1220 # ---------------------------------------------------------------------------
1223 find * $(RCS_FIND_IGNORE) \
1224 -name '*.[hcS]' -type f -print | sort \
1225 | xargs $(PERL) -w scripts/checkincludes.pl
1228 find * $(RCS_FIND_IGNORE) \
1229 -name '*.[hcS]' -type f -print | sort \
1230 | xargs $(PERL) -w scripts/checkversion.pl
1233 $(PERL) $(srctree)/scripts/namespace.pl
1235 endif #ifeq ($(config-targets),1)
1236 endif #ifeq ($(mixed-targets),1)
1240 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1241 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1244 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1245 $(error kernelrelease not valid - run 'make *config' to update it))
1247 @echo $(KERNELVERSION)
1250 # ---------------------------------------------------------------------------
1251 # Single targets are compatible with:
1252 # - build whith mixed source and output
1253 # - build with separate output dir 'make O=...'
1254 # - external modules
1256 # target-dir => where to store outputfile
1257 # build-dir => directory in kernel source tree to use
1259 ifeq ($(KBUILD_EXTMOD),)
1260 build-dir = $(patsubst %/,%,$(dir $@))
1261 target-dir = $(dir $@)
1263 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1264 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1265 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1268 %.s: %.c prepare scripts FORCE
1269 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1270 %.i: %.c prepare scripts FORCE
1271 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1272 %.o: %.c prepare scripts FORCE
1273 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1274 %.lst: %.c prepare scripts FORCE
1275 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1276 %.s: %.S prepare scripts FORCE
1277 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1278 %.o: %.S prepare scripts FORCE
1279 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1282 %/: prepare scripts FORCE
1283 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1284 $(build)=$(build-dir)
1285 /: prepare scripts FORCE
1286 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1287 $(build)=$(build-dir)
1289 %.ko: prepare scripts FORCE
1290 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1291 $(build)=$(build-dir) $(@:.ko=.o)
1292 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1294 # FIXME Should go into a make.lib or something
1295 # ===========================================================================
1297 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1298 cmd_rmdirs = rm -rf $(rm-dirs)
1300 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1301 cmd_rmfiles = rm -f $(rm-files)
1304 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1305 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1306 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1308 quiet_cmd_as_o_S = AS $@
1309 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1311 # read all saved command lines
1313 targets := $(wildcard $(sort $(targets)))
1314 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1316 ifneq ($(cmd_files),)
1317 $(cmd_files): ; # Do not try to update included dependency files
1318 include $(cmd_files)
1321 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1323 # $(Q)$(MAKE) $(clean)=dir
1324 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1326 endif # skip-makefile
1331 -include $(srctree)/Makefile.custom
1333 # Declare the contents of the .PHONY variable as phony. We keep that
1334 # information in a variable se we can use it in if_changed and friends.