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 # SUBARCH tells the usermode build what the underlying arch is. That is set
146 # first, and if a usermode build is happening, the "ARCH=um" on the command
147 # line overrides the setting of ARCH below. If a native build is happening,
148 # then ARCH is assigned, getting whatever value it gets normally, and
149 # SUBARCH is subsequently ignored.
151 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
152 -e s/arm.*/arm/ -e s/sa110/arm/ \
153 -e s/s390x/s390/ -e s/parisc64/parisc/ \
154 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
156 # Cross compiling and selecting different set of gcc/bin-utils
157 # ---------------------------------------------------------------------------
159 # When performing cross compilation for other architectures ARCH shall be set
160 # to the target architecture. (See arch/* for the possibilities).
161 # ARCH can be set during invocation of make:
163 # Another way is to have ARCH set in the environment.
164 # The default ARCH is the host where make is executed.
166 # CROSS_COMPILE specify the prefix used for all executables used
167 # during compilation. Only gcc and related bin-utils executables
168 # are prefixed with $(CROSS_COMPILE).
169 # CROSS_COMPILE can be set on the command line
170 # make CROSS_COMPILE=ia64-linux-
171 # Alternatively CROSS_COMPILE can be set in the environment.
172 # Default value for CROSS_COMPILE is not to prefix executables
173 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
178 # Architecture as present in compile.h
179 UTS_MACHINE := $(ARCH)
181 # SHELL used by kbuild
182 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
183 else if [ -x /bin/bash ]; then echo /bin/bash; \
184 else echo sh; fi ; fi)
188 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
191 # Decide whether to build built-in, modular, or both.
192 # Normally, just do built-in.
197 # If we have only "make modules", don't compile built-in objects.
198 # When we're building modules with modversions, we need to consider
199 # the built-in objects during the descend as well, in order to
200 # make sure the checksums are uptodate before we record them.
202 ifeq ($(MAKECMDGOALS),modules)
203 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
206 # If we have "make <whatever> modules", compile modules
207 # in addition to whatever we do anyway.
208 # Just "make" or "make all" shall build modules as well
210 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
214 ifeq ($(MAKECMDGOALS),)
218 export KBUILD_MODULES KBUILD_BUILTIN
219 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
222 # ---------------------------------------------------------------------------
224 # Normally, we echo the whole command before executing it. By making
225 # that echo $($(quiet)$(cmd)), we now have the possibility to set
226 # $(quiet) to choose other forms of output instead, e.g.
228 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
229 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
231 # If $(quiet) is empty, the whole command will be printed.
232 # If it is set to "quiet_", only the short version will be printed.
233 # If it is set to "silent_", nothing wil be printed at all, since
234 # the variable $(silent_cmd_cc_o_c) doesn't exist.
236 # A simple variant is to prefix commands with $(Q) - that's useful
237 # for commands that shall be hidden in non-verbose mode.
241 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
242 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
244 ifeq ($(KBUILD_VERBOSE),1)
252 # If the user is running make -s (silent mode), suppress echoing of
255 ifneq ($(findstring s,$(MAKEFLAGS)),)
259 export quiet Q KBUILD_VERBOSE
262 # Look for make include files relative to root of kernel src
263 MAKEFLAGS += --include-dir=$(srctree)
265 # We need some generic definitions
266 include $(srctree)/scripts/Kbuild.include
268 # For maximum performance (+ possibly random breakage, uncomment
273 # Make variables (CC, etc...)
275 AS = $(CROSS_COMPILE)as
276 LD = $(CROSS_COMPILE)ld
277 CC = $(CROSS_COMPILE)gcc
279 AR = $(CROSS_COMPILE)ar
280 NM = $(CROSS_COMPILE)nm
281 STRIP = $(CROSS_COMPILE)strip
282 OBJCOPY = $(CROSS_COMPILE)objcopy
283 OBJDUMP = $(CROSS_COMPILE)objdump
285 GENKSYMS = scripts/genksyms/genksyms
286 DEPMOD = /sbin/depmod
287 KALLSYMS = scripts/kallsyms
291 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
293 CFLAGS_MODULE = $(MODFLAGS)
294 AFLAGS_MODULE = $(MODFLAGS)
300 # Use LINUXINCLUDE when you must reference the include/ directory.
301 # Needed to be compatible with the O= option
306 # Read KERNELRELEASE from .kernelrelease (if it exists)
307 KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
308 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
310 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
311 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
312 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
313 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
315 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
316 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
317 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
319 # When compiling out-of-tree modules, put MODVERDIR in the module
320 # tree rather than in the kernel tree. The kernel tree might
322 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
324 # Files to ignore in find ... statements
326 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
327 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
329 # ===========================================================================
330 # Rules shared between *config targets and build targets
332 # Basic helpers built in scripts/
333 PHONY += scripts_basic
335 $(Q)$(MAKE) $(build)=scripts/basic
337 # To avoid any implicit rule to kick in, define an empty command.
338 scripts/basic/%: scripts_basic ;
340 PHONY += outputmakefile
341 # outputmakefile generates a Makefile in the output directory, if using a
342 # separate output directory. This allows convenient use of make in the
345 ifneq ($(KBUILD_SRC),)
346 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
347 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
350 # To make sure we do not include .config for any of the *config targets
351 # catch them early, and hand them over to scripts/kconfig/Makefile
352 # It is allowed to specify more targets when calling make, including
353 # mixing *config targets and build targets.
354 # For example 'make oldconfig all'.
355 # Detect when mixed targets is specified, and make a second invocation
356 # of make so .config is not included in this case either (for *config).
358 no-dot-config-targets := clean mrproper distclean \
359 cscope TAGS tags help %docs check%
365 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
366 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
371 ifeq ($(KBUILD_EXTMOD),)
372 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
374 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
380 ifeq ($(mixed-targets),1)
381 # ===========================================================================
382 # We're called with mixed targets (*config and build targets).
383 # Handle them one by one.
386 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
389 ifeq ($(config-targets),1)
390 # ===========================================================================
391 # *config targets only - make sure prerequisites are updated, and descend
392 # in scripts/kconfig to make the *config target
394 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
395 # KBUILD_DEFCONFIG may point out an alternative default configuration
396 # used for 'make defconfig'
397 -include $(srctree)/arch/$(ARCH)/Makefile
398 export KBUILD_DEFCONFIG
400 config %config: scripts_basic outputmakefile FORCE
402 $(Q)$(MAKE) $(build)=scripts/kconfig $@
403 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
406 # ===========================================================================
407 # Build targets only - this includes busybox, arch specific targets, clean
408 # targets and others. In general all targets except *config targets.
410 ifeq ($(KBUILD_EXTMOD),)
411 # Additional helpers built in scripts/
412 # Carefully list dependencies so we do not try to build scripts twice
415 scripts: scripts_basic include/config/MARKER
416 $(Q)$(MAKE) $(build)=$(@)
418 scripts_basic: include/autoconf.h
420 # Objects we will link into busybox / subdirs we need to visit
426 archival/libunarchive/ \
429 coreutils/libcoreutils/ \
445 networking/libiproute/ \
453 endif # KBUILD_EXTMOD
455 ifeq ($(dot-config),1)
456 # In this section, we need .config
458 # Read in dependencies to all Kconfig* files, make sure to run
459 # oldconfig if changes are detected.
464 # If .config needs to be updated, it will be done via the dependency
465 # that autoconf has on .config.
466 # To avoid any implicit rule to kick in, define an empty command
467 .config .kconfig.d: ;
469 # Now we can define CFLAGS etc according to .config
470 include $(srctree)/Makefile.flags
472 # If .config is newer than include/autoconf.h, someone tinkered
473 # with it and forgot to run make oldconfig.
474 # If kconfig.d is missing then we are probarly in a cleaned tree so
475 # we execute the config step to be sure to catch updated Kconfig files
476 include/autoconf.h: .kconfig.d .config
477 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
480 # Dummy target needed, because used as prerequisite
481 include/autoconf.h: ;
484 # The all: target is the default when no target is given on the
486 # This allow a user to issue only 'make' to build a kernel including modules
487 # Defaults busybox but it is usually overriden in the arch makefile
490 -include $(srctree)/arch/$(ARCH)/Makefile
492 # arch Makefile may override CC so keep this after arch Makefile is included
493 #bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
494 CHECKFLAGS += $(NOSTDINC_FLAGS)
496 # warn about C99 declaration after statement
497 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
499 # disable pointer signedness warnings in gcc 4.0
500 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
502 # Default kernel image to build when no specific target is given.
503 # KBUILD_IMAGE may be overruled on the commandline or
504 # set in the environment
505 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
507 export KBUILD_IMAGE ?= busybox
510 # INSTALL_PATH specifies where to place the updated kernel and system map
511 # images. Default is /boot, but you can set it to other values
512 export INSTALL_PATH ?= /boot
515 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
516 # relocations required by build roots. This is not defined in the
517 # makefile but the arguement can be passed to make if needed.
520 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
524 ifeq ($(KBUILD_EXTMOD),)
525 busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
527 busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
528 $(core-n) $(core-) $(libs-n) $(libs-) \
531 core-y := $(patsubst %/, %/built-in.o, $(core-y))
532 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
533 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
534 libs-y := $(libs-y1) $(libs-y2)
538 # ---------------------------------------------------------------------------
539 # busybox is build from the objects selected by $(busybox-init) and
540 # $(busybox-main). Most are built-in.o files from top-level directories
541 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
542 # Ordering when linking is important, and $(busybox-init) must be first.
547 # +-< $(busybox-init)
548 # | +--< init/version.o + more
550 # +--< $(busybox-main)
551 # | +--< driver/built-in.o mm/built-in.o + more
553 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
555 # busybox version (uname -v) cannot be updated during normal
556 # descending-into-subdirs phase since we do not yet know if we need to
558 # Therefore this step is delayed until just before final link of busybox -
559 # except in the kallsyms case where it is done just before adding the
560 # symbols to the kernel.
562 # System.map is generated to document addresses of all kernel symbols
564 busybox-all := $(core-y) $(libs-y)
566 # Rule to link busybox - also used during CONFIG_KALLSYMS
567 # May be overridden by arch/$(ARCH)/Makefile
568 quiet_cmd_busybox__ ?= LINK $@
570 cmd_busybox__ ?= $(srctree)/scripts/trylink $(CC) \
573 -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
574 -Wl,--start-group $(busybox-all) -Wl,--end-group
576 cmd_busybox__ ?= $(srctree)/scripts/trylink $(CC) -o $@ \
577 -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
578 -Wl,--start-group $(busybox-all) -Wl,--end-group
581 # Generate System.map
582 quiet_cmd_sysmap = SYSMAP
583 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
586 # If CONFIG_KALLSYMS is set .version is already updated
587 # Generate System.map and verify that the content is consistent
588 # Use + in front of the busybox_version rule to silent warning with make -j2
589 # First command is ':' to allow us to use + in front of the rule
590 define rule_busybox__
592 $(call cmd,busybox__)
593 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
597 ifdef CONFIG_KALLSYMS
598 # Generate section listing all symbols and add it into busybox $(kallsyms.o)
599 # It's a three stage process:
600 # o .tmp_busybox1 has all symbols and sections, but __kallsyms is
602 # Running kallsyms on that gives us .tmp_kallsyms1.o with
603 # the right size - busybox version (uname -v) is updated during this step
604 # o .tmp_busybox2 now has a __kallsyms section of the right size,
605 # but due to the added section, some addresses have shifted.
606 # From here, we generate a correct .tmp_kallsyms2.o
607 # o The correct .tmp_kallsyms2.o is linked into the final busybox.
608 # o Verify that the System.map from busybox matches the map from
609 # .tmp_busybox2, just in case we did not generate kallsyms correctly.
610 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
611 # .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a
612 # temporary bypass to allow the kernel to be built while the
613 # maintainers work out what went wrong with kallsyms.
615 ifdef CONFIG_KALLSYMS_EXTRA_PASS
621 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
623 define verify_kallsyms
624 $(Q)$(if $($(quiet)cmd_sysmap), \
625 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
626 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
627 $(Q)cmp -s System.map .tmp_System.map || \
628 (echo Inconsistent kallsyms data; \
629 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
630 rm .tmp_kallsyms* ; /bin/false )
633 # Update busybox version before link
634 # Use + in front of this rule to silent warning about make -j1
635 # First command is ':' to allow us to use + in front of this rule
636 cmd_ksym_ld = $(cmd_busybox__)
639 +$(call cmd,busybox_version)
640 $(call cmd,busybox__)
641 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
644 # Generate .S file with all kernel symbols
645 quiet_cmd_kallsyms = KSYM $@
646 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
647 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
649 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
650 $(call if_changed_dep,as_o_S)
652 .tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
655 # .tmp_busybox1 must be complete except kallsyms, so update busybox version
656 .tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
657 $(call if_changed_rule,ksym_ld)
659 .tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
660 $(call if_changed,busybox__)
662 .tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
663 $(call if_changed,busybox__)
665 # Needs to visit scripts/ before $(KALLSYMS) can be used.
666 $(KALLSYMS): scripts ;
668 # Generate some data for debugging strange kallsyms problems
669 debug_kallsyms: .tmp_map$(last_kallsyms)
671 .tmp_map%: .tmp_busybox% FORCE
672 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
678 endif # ifdef CONFIG_KALLSYMS
680 # busybox image - including updated kernel symbols
681 busybox_unstripped: $(busybox-all) FORCE
682 $(call if_changed_rule,busybox__)
683 $(Q)rm -f .old_version
685 busybox: busybox_unstripped
686 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
687 busybox_unstripped -o $@
689 # The actual objects are generated when descending,
690 # make sure no implicit rule kicks in
691 $(sort $(busybox-all)): $(busybox-dirs) ;
693 # Handle descending into subdirectories listed in $(busybox-dirs)
694 # Preset locale variables to speed up the build process. Limit locale
695 # tweaks to this spot to avoid wrong language settings when running
696 # make menuconfig etc.
697 # Error messages still appears in the original language
699 PHONY += $(busybox-dirs)
700 $(busybox-dirs): prepare scripts
701 $(Q)$(MAKE) $(build)=$@
703 # Build the kernel release string
704 # The KERNELRELEASE is stored in a file named .kernelrelease
705 # to be used when executing for example make install or make modules_install
707 # Take the contents of any files called localversion* and the config
708 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
709 # LOCALVERSION from the command line override all of this
712 space := $(nullstring) # end of line
714 ___localver = $(objtree)/localversion* $(srctree)/localversion*
715 __localver = $(sort $(wildcard $(___localver)))
716 # skip backup files (containing '~')
717 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
719 localver = $(subst $(space),, \
720 $(shell cat /dev/null $(_localver)) \
721 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
723 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
724 # and if the SCM is know a tag from the SCM is appended.
725 # The appended tag is determinded by the SCM used.
727 # Currently, only git is supported.
728 # Other SCMs can edit scripts/setlocalversion and add the appropriate
730 ifdef CONFIG_LOCALVERSION_AUTO
731 _localver-auto = $(shell $(CONFIG_SHELL) \
732 $(srctree)/scripts/setlocalversion $(srctree))
733 localver-auto = $(LOCALVERSION)$(_localver-auto)
736 localver-full = $(localver)$(localver-auto)
738 # Store (new) KERNELRELASE string in .kernelrelease
739 kernelrelease = $(KERNELVERSION)$(localver-full)
740 .kernelrelease: FORCE
742 $(Q)echo $(kernelrelease) > $@
745 # Things we need to do before we recursively start building the kernel
746 # or the modules are listed in "prepare".
747 # A multi level approach is used. prepareN is processed before prepareN-1.
748 # archprepare is used in arch Makefiles and when processed asm symlink,
749 # version.h and scripts_basic is processed / created.
751 # Listed in dependency order
752 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
754 # prepare-all is deprecated, use prepare as valid replacement
757 # prepare3 is used to check if we are building in a separate output directory,
759 # 1) Check that make has not been executed in the kernel src $(srctree)
760 # 2) Create the include2 directory, used for the second asm symlink
761 prepare3: .kernelrelease
762 ifneq ($(KBUILD_SRC),)
763 @echo ' Using $(srctree) as source for kernel'
764 $(Q)if [ -f $(srctree)/.config ]; then \
765 echo " $(srctree) is not clean, please run 'make mrproper'";\
766 echo " in the '$(srctree)' directory.";\
769 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
770 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
773 # prepare2 creates a makefile if using a separate output directory
774 prepare2: prepare3 outputmakefile
776 prepare1: prepare2 include/config/MARKER
777 ifneq ($(KBUILD_MODULES),)
778 $(Q)mkdir -p $(MODVERDIR)
779 $(Q)rm -f $(MODVERDIR)/*
782 archprepare: prepare1 scripts_basic
784 prepare0: archprepare FORCE
785 $(Q)$(MAKE) $(build)=.
787 # All the preparing..
788 prepare prepare-all: prepare0
790 # Leave this as default for preprocessing busybox.lds.S, which is now
791 # done in arch/$(ARCH)/kernel/Makefile
793 export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
795 # FIXME: The asm symlink changes when $(ARCH) changes. That's
796 # hard to detect, but I suppose "make mrproper" is a good idea
797 # before switching between archs anyway.
800 #bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
801 #bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
802 #bbox# @ln -fsn asm-$(ARCH) $@
804 # Split autoconf.h into include/linux/config/*
805 #bbox# piggybacked generation of few .h files
806 include/config/MARKER: scripts/basic/split-include include/autoconf.h
807 @echo ' SPLIT include/autoconf.h -> include/config/*'
808 @scripts/basic/split-include include/autoconf.h include/config
809 @echo ' GEN include/bbconfigopts.h'
810 @$(srctree)/scripts/mkconfigs >include/bbconfigopts.h
813 # Generate some files
814 # ---------------------------------------------------------------------------
816 # KERNELRELEASE can change from a few different places, meaning version.h
817 # needs to be updated, so this check is forced on all builds
821 define filechk_version.h
822 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
823 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
826 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
827 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
828 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
832 # ---------------------------------------------------------------------------
836 @echo '*** Warning: make $@ is unnecessary now.'
838 # ---------------------------------------------------------------------------
843 # By default, build modules as well
850 modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
851 @echo ' Building modules, stage 2.';
852 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
855 # Target to prepare building external modules
856 PHONY += modules_prepare
857 modules_prepare: prepare scripts
859 # Target to install modules
860 PHONY += modules_install
861 modules_install: _modinst_ _modinst_post
865 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
866 echo "Warning: you may need to install module-init-tools"; \
867 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
870 @rm -rf $(MODLIB)/kernel
871 @rm -f $(MODLIB)/source
872 @mkdir -p $(MODLIB)/kernel
873 @ln -s $(srctree) $(MODLIB)/source
874 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
875 rm -f $(MODLIB)/build ; \
876 ln -s $(objtree) $(MODLIB)/build ; \
878 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
880 # If System.map exists, run depmod. This deliberately does not have a
881 # dependency on System.map since that would run the dependency tree on
882 # busybox. This depmod is only for convenience to give the initial
883 # boot a modules.dep even before / is mounted read-write. However the
884 # boot script depmod is the master version.
885 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
888 depmod_opts := -b $(INSTALL_MOD_PATH) -r
890 PHONY += _modinst_post
891 _modinst_post: _modinst_
892 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
894 else # CONFIG_MODULES
896 # Modules not configured
897 # ---------------------------------------------------------------------------
899 modules modules_install: FORCE
901 @echo "The present busybox configuration has modules disabled."
902 @echo "Type 'make config' and enable loadable module support."
903 @echo "Then build a kernel with module support enabled."
907 endif # CONFIG_MODULES
910 # Cleaning is done on three levels.
911 # make clean Delete most generated files
912 # Leave enough to build external modules
913 # make mrproper Delete the current configuration, and all generated files
914 # make distclean Remove editor backup files, patch leftover files and the like
916 # Directories & files removed with 'make clean'
917 CLEAN_DIRS += $(MODVERDIR)
918 CLEAN_FILES += busybox* System.map \
919 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
921 # Directories & files removed with 'make mrproper'
922 MRPROPER_DIRS += include/config include2
923 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
925 include/bbconfigopts.h \
926 include/usage_compressed.h \
927 .kernelrelease Module.symvers tags TAGS cscope*
929 # clean - Delete most, but leave enough to build external modules
931 clean: rm-dirs := $(CLEAN_DIRS)
932 clean: rm-files := $(CLEAN_FILES)
933 clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
935 PHONY += $(clean-dirs) clean archclean
937 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
939 clean: archclean $(clean-dirs)
942 @find . $(RCS_FIND_IGNORE) \
943 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
944 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
945 -type f -print | xargs rm -f
947 # mrproper - Delete all generated files, including .config
949 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
950 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
951 mrproper-dirs := $(addprefix _mrproper_,scripts)
953 PHONY += $(mrproper-dirs) mrproper archmrproper
955 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
957 mrproper: clean archmrproper $(mrproper-dirs)
966 @find $(srctree) $(RCS_FIND_IGNORE) \
967 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
968 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
969 -o -name '.*.rej' -o -size 0 \
970 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
971 -type f -print | xargs rm -f
974 # Packaging of the kernel to various formats
975 # ---------------------------------------------------------------------------
976 # rpm target kept for backward compatibility
977 package-dir := $(srctree)/scripts/package
980 $(Q)$(MAKE) $(build)=$(package-dir) $@
982 $(Q)$(MAKE) $(build)=$(package-dir) $@
985 # Brief documentation of the typical targets used
986 # ---------------------------------------------------------------------------
988 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
989 boards := $(notdir $(boards))
991 -include $(srctree)/Makefile.help
993 # Documentation targets
994 # ---------------------------------------------------------------------------
995 %docs: scripts_basic FORCE
996 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1001 # External module support.
1002 # When building external modules the kernel used as basis is considered
1003 # read-only, and no consistency checks are made and the make
1004 # system is not used on the basis kernel. If updates are required
1005 # in the basis kernel ordinary make commands (without M=...) must
1008 # The following are the only valid targets when building external
1010 # make M=dir clean Delete all automatically generated files
1011 # make M=dir modules Make all modules in specified dir
1012 # make M=dir Same as 'make M=dir modules'
1013 # make M=dir modules_install
1014 # Install the modules build in the module directory
1015 # Assumes install directory is already created
1017 # We are always building modules
1019 PHONY += crmodverdir
1021 $(Q)mkdir -p $(MODVERDIR)
1022 $(Q)rm -f $(MODVERDIR)/*
1024 PHONY += $(objtree)/Module.symvers
1025 $(objtree)/Module.symvers:
1026 @test -e $(objtree)/Module.symvers || ( \
1028 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1029 echo " is missing; modules will have no dependencies and modversions."; \
1032 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1033 PHONY += $(module-dirs) modules
1034 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1035 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1037 modules: $(module-dirs)
1038 @echo ' Building modules, stage 2.';
1039 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1041 PHONY += modules_install
1042 modules_install: _emodinst_ _emodinst_post
1044 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1047 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1048 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1050 # Run depmod only is we have System.map and depmod is executable
1051 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1052 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1053 $(DEPMOD) -ae -F System.map \
1054 $(if $(strip $(INSTALL_MOD_PATH)), \
1055 -b $(INSTALL_MOD_PATH) -r) \
1059 PHONY += _emodinst_post
1060 _emodinst_post: _emodinst_
1063 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1065 PHONY += $(clean-dirs) clean
1067 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1069 clean: rm-dirs := $(MODVERDIR)
1070 clean: $(clean-dirs)
1072 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1073 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1074 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1075 -type f -print | xargs rm -f
1078 @echo ' Building external modules.'
1079 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1081 @echo ' modules - default target, build the module(s)'
1082 @echo ' modules_install - install the module'
1083 @echo ' clean - remove generated files in module directory only'
1087 PHONY += prepare scripts
1090 endif # KBUILD_EXTMOD
1092 # Generate tags for editors
1093 # ---------------------------------------------------------------------------
1095 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1096 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1097 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1099 ifeq ($(src),$(obj))
1102 __srctree = $(srctree)/
1105 ifeq ($(ALLSOURCE_ARCHS),)
1107 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1109 ALLINCLUDE_ARCHS := $(ARCH)
1112 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1113 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1116 ALLSOURCE_ARCHS := $(ARCH)
1119 ( find $(__srctree) $(RCS_FIND_IGNORE) \
1120 \( -name include -o -name arch \) -prune -o \
1121 -name '*.[chS]' -print; \
1122 for ARCH in $(ALLSOURCE_ARCHS) ; do \
1123 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1124 -name '*.[chS]' -print; \
1126 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1127 -name '*.[chS]' -print; \
1128 find $(__srctree)include $(RCS_FIND_IGNORE) \
1129 \( -name config -o -name 'asm-*' \) -prune \
1130 -o -name '*.[chS]' -print; \
1131 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1132 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1133 -name '*.[chS]' -print; \
1135 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1136 -name '*.[chS]' -print )
1139 quiet_cmd_cscope-file = FILELST cscope.files
1140 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1142 quiet_cmd_cscope = MAKE cscope.out
1143 cmd_cscope = cscope -b
1146 $(call cmd,cscope-file)
1149 quiet_cmd_TAGS = MAKE $@
1152 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
1153 echo "-I __initdata,__exitdata,__acquires,__releases \
1154 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1155 --extra=+f --c-kinds=+px"`; \
1156 $(all-sources) | xargs etags $$ETAGSF -a
1163 quiet_cmd_tags = MAKE $@
1166 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
1167 echo "-I __initdata,__exitdata,__acquires,__releases \
1168 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1169 --extra=+f --c-kinds=+px"`; \
1170 $(all-sources) | xargs ctags $$CTAGSF -a
1177 # Scripts to check various things for consistency
1178 # ---------------------------------------------------------------------------
1181 find * $(RCS_FIND_IGNORE) \
1182 -name '*.[hcS]' -type f -print | sort \
1183 | xargs $(PERL) -w scripts/checkincludes.pl
1186 find * $(RCS_FIND_IGNORE) \
1187 -name '*.[hcS]' -type f -print | sort \
1188 | xargs $(PERL) -w scripts/checkversion.pl
1191 $(PERL) $(srctree)/scripts/namespace.pl
1193 endif #ifeq ($(config-targets),1)
1194 endif #ifeq ($(mixed-targets),1)
1198 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1199 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1202 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1203 $(error kernelrelease not valid - run 'make *config' to update it))
1205 @echo $(KERNELVERSION)
1208 # ---------------------------------------------------------------------------
1209 # Single targets are compatible with:
1210 # - build whith mixed source and output
1211 # - build with separate output dir 'make O=...'
1212 # - external modules
1214 # target-dir => where to store outputfile
1215 # build-dir => directory in kernel source tree to use
1217 ifeq ($(KBUILD_EXTMOD),)
1218 build-dir = $(patsubst %/,%,$(dir $@))
1219 target-dir = $(dir $@)
1221 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1222 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1223 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1226 %.s: %.c prepare scripts FORCE
1227 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1228 %.i: %.c prepare scripts FORCE
1229 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1230 %.o: %.c prepare scripts FORCE
1231 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1232 %.lst: %.c prepare scripts FORCE
1233 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1234 %.s: %.S prepare scripts FORCE
1235 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1236 %.o: %.S prepare scripts FORCE
1237 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1240 / %/: prepare scripts FORCE
1241 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1242 $(build)=$(build-dir)
1243 %.ko: prepare scripts FORCE
1244 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1245 $(build)=$(build-dir) $(@:.ko=.o)
1246 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1248 # FIXME Should go into a make.lib or something
1249 # ===========================================================================
1251 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1252 cmd_rmdirs = rm -rf $(rm-dirs)
1254 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1255 cmd_rmfiles = rm -f $(rm-files)
1258 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1259 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1260 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1262 quiet_cmd_as_o_S = AS $@
1263 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1265 # read all saved command lines
1267 targets := $(wildcard $(sort $(targets)))
1268 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1270 ifneq ($(cmd_files),)
1271 $(cmd_files): ; # Do not try to update included dependency files
1272 include $(cmd_files)
1275 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1277 # $(Q)$(MAKE) $(clean)=dir
1278 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1280 endif # skip-makefile
1285 -include $(srctree)/Makefile.custom
1287 # Declare the contents of the .PHONY variable as phony. We keep that
1288 # information in a variable se we can use it in if_changed and friends.