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 of
22 # unavoidable when linking the built-in.o targets which finally
23 # turn into vmlinux), 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 = $(C)
52 ifndef KBUILD_CHECKSRC
56 # Use make M=dir to specify direcotry of external module to build
57 # Old syntax make ... SUBDIRS=$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 syntax'es 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= assigment takes precedence over the KBUILD_OUTPUT environment variable.
84 # KBUILD_SRC is set on invocation of make in OBJ directory
85 # KBUILD_SRC is not intended to be used by the regular user (for now)
88 # OK, Make called in directory where kernel src resides
89 # Do we want to locate output files in a separate directory?
91 ifeq ("$(origin O)", "command line")
96 # That's our default target when none is given on the command line
100 ifneq ($(KBUILD_OUTPUT),)
101 # Invoke a second make in the output directory, passing relevant variables
102 # check that the output directory actually exists
103 saved-output := $(KBUILD_OUTPUT)
104 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
105 $(if $(wildcard $(KBUILD_OUTPUT)),, \
106 $(error output directory "$(saved-output)" does not exist))
108 .PHONY: $(MAKECMDGOALS)
110 $(filter-out _all,$(MAKECMDGOALS)) _all:
111 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
112 KBUILD_SRC=$(CURDIR) KBUILD_VERBOSE=$(KBUILD_VERBOSE) \
113 KBUILD_CHECK=$(KBUILD_CHECK) KBUILD_EXTMOD="$(KBUILD_EXTMOD)" \
114 -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 # Make sure we're not wasting cpu-cycles doing locale handling, yet do make
134 # sure error messages appear in the user-desired language
141 export LANG LC_ALL LC_COLLATE LC_CTYPE
143 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
145 # FIXME - TOPDIR is obsolete, use srctree/objtree
152 export srctree objtree VPATH TOPDIR
154 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
156 # SUBARCH tells the usermode build what the underlying arch is. That is set
157 # first, and if a usermode build is happening, the "ARCH=um" on the command
158 # line overrides the setting of ARCH below. If a native build is happening,
159 # then ARCH is assigned, getting whatever value it gets normally, and
160 # SUBARCH is subsequently ignored.
162 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
163 -e s/arm.*/arm/ -e s/sa110/arm/ \
164 -e s/s390x/s390/ -e s/parisc64/parisc/ )
166 # Cross compiling and selecting different set of gcc/bin-utils
167 # ---------------------------------------------------------------------------
169 # When performing cross compilation for other architectures ARCH shall be set
170 # to the target architecture. (See arch/* for the possibilities).
171 # ARCH can be set during invocation of make:
173 # Another way is to have ARCH set in the environment.
174 # The default ARCH is the host where make is executed.
176 # CROSS_COMPILE specify the prefix used for all executables used
177 # during compilation. Only gcc and related bin-utils executables
178 # are prefixed with $(CROSS_COMPILE).
179 # CROSS_COMPILE can be set on the command line
180 # make CROSS_COMPILE=ia64-linux-
181 # Alternatively CROSS_COMPILE can be set in the environment.
182 # Default value for CROSS_COMPILE is not to prefix executables
183 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
188 # Architecture as present in compile.h
189 UTS_MACHINE := $(ARCH)
191 # SHELL used by kbuild
192 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
193 else if [ -x /bin/bash ]; then echo /bin/bash; \
194 else echo sh; fi ; fi)
198 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
201 # Decide whether to build built-in, modular, or both.
202 # Normally, just do built-in.
207 # If we have only "make modules", don't compile built-in objects.
208 # When we're building modules with modversions, we need to consider
209 # the built-in objects during the descend as well, in order to
210 # make sure the checksums are uptodate before we record them.
212 ifeq ($(MAKECMDGOALS),modules)
213 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
216 # If we have "make <whatever> modules", compile modules
217 # in addition to whatever we do anyway.
218 # Just "make" or "make all" shall build modules as well
220 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
224 ifeq ($(MAKECMDGOALS),)
228 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
229 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
232 # ---------------------------------------------------------------------------
234 # Normally, we echo the whole command before executing it. By making
235 # that echo $($(quiet)$(cmd)), we now have the possibility to set
236 # $(quiet) to choose other forms of output instead, e.g.
238 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
239 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
241 # If $(quiet) is empty, the whole command will be printed.
242 # If it is set to "quiet_", only the short version will be printed.
243 # If it is set to "silent_", nothing wil be printed at all, since
244 # the variable $(silent_cmd_cc_o_c) doesn't exist.
246 # A simple variant is to prefix commands with $(Q) - that's usefull
247 # for commands that shall be hidden in non-verbose mode.
251 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
252 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
254 ifeq ($(KBUILD_VERBOSE),1)
262 # If the user is running make -s (silent mode), suppress echoing of
265 ifneq ($(findstring s,$(MAKEFLAGS)),)
269 check_gcc = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
271 export quiet Q KBUILD_VERBOSE check_gcc
273 # Look for make include files relative to root of kernel src
274 MAKEFLAGS += --include-dir=$(srctree)
276 # For maximum performance (+ possibly random breakage, uncomment
281 # Make variables (CC, etc...)
283 AS = $(CROSS_COMPILE)as
284 LD = $(CROSS_COMPILE)ld
285 CC = $(CROSS_COMPILE)gcc
287 AR = $(CROSS_COMPILE)ar
288 NM = $(CROSS_COMPILE)nm
289 STRIP = $(CROSS_COMPILE)strip
290 OBJCOPY = $(CROSS_COMPILE)objcopy
291 OBJDUMP = $(CROSS_COMPILE)objdump
293 RPM := $(shell if [ -x "/usr/bin/rpmbuild" ]; then echo rpmbuild; \
295 GENKSYMS = scripts/genksyms/genksyms
296 DEPMOD = /sbin/depmod
297 KALLSYMS = scripts/kallsyms
301 CFLAGS_MODULE = $(MODFLAGS)
302 AFLAGS_MODULE = $(MODFLAGS)
307 NOSTDINC_FLAGS = -nostdinc -iwithprefix include
309 CPPFLAGS := -D__KERNEL__ -Iinclude \
310 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
312 CFLAGS := -Wall -Wstrict-prototypes -Wno-trigraphs \
313 -fno-strict-aliasing -fno-common
314 AFLAGS := -D__ASSEMBLY__
316 export VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
317 CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
318 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
319 HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE CHECK
321 export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
322 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
323 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
325 # When compiling out-of-tree modules, put MODVERDIR in the module
326 # tree rather than in the kernel tree. The kernel tree might
328 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
330 # The temporary file to save gcc -MD generated dependencies must not
333 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
335 # Files to ignore in find ... statements
337 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \) -prune -o
338 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS
340 # ===========================================================================
341 # Rules shared between *config targets and build targets
343 # Basic helpers built in scripts/
344 .PHONY: scripts_basic
346 $(Q)$(MAKE) $(build)=scripts/basic
348 # To make sure we do not include .config for any of the *config targets
349 # catch them early, and hand them over to scripts/kconfig/Makefile
350 # It is allowed to specify more targets when calling make, including
351 # mixing *config targets and build targets.
352 # For example 'make oldconfig all'.
353 # Detect when mixed targets is specified, and make a second invocation
354 # of make so .config is not included in this case either (for *config).
356 no-dot-config-targets := clean mrproper distclean \
357 cscope TAGS tags help %docs check%
363 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
364 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
369 ifeq ($(KBUILD_EXTMOD),)
370 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
372 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
378 ifeq ($(mixed-targets),1)
379 # ===========================================================================
380 # We're called with mixed targets (*config and build targets).
381 # Handle them one by one.
384 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
387 ifeq ($(config-targets),1)
388 # ===========================================================================
389 # *config targets only - make sure prerequisites are updated, and descend
390 # in scripts/kconfig to make the *config target
392 config: scripts_basic FORCE
393 $(Q)$(MAKE) $(build)=scripts/kconfig $@
394 %config: scripts_basic FORCE
395 $(Q)$(MAKE) $(build)=scripts/kconfig $@
398 # ===========================================================================
399 # Build targets only - this includes vmlinux, arch specific targets, clean
400 # targets and others. In general all targets except *config targets.
402 ifeq ($(KBUILD_EXTMOD),)
403 # Additional helpers built in scripts/
404 # Carefully list dependencies so we do not try to build scripts twice
407 scripts: scripts_basic include/config/MARKER
408 $(Q)$(MAKE) $(build)=$(@)
410 scripts_basic: include/linux/autoconf.h
413 # That's our default target when none is given on the command line
414 # Note that 'modules' will be added as a prerequisite as well,
415 # in the CONFIG_MODULES part below
419 # Objects we will link into vmlinux / subdirs we need to visit
421 drivers-y := drivers/ sound/
425 endif # KBUILD_EXTMOD
427 ifeq ($(dot-config),1)
428 # In this section, we need .config
430 # Read in dependencies to all Kconfig* files, make sure to run
431 # oldconfig if changes are detected.
436 # If .config needs to be updated, it will be done via the dependency
437 # that autoconf has on .config.
438 # To avoid any implicit rule to kick in, define an empty command
441 # If .config is newer than include/linux/autoconf.h, someone tinkered
442 # with it and forgot to run make oldconfig
443 include/linux/autoconf.h: .config
444 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
446 # Dummy target needed, because used as prerequisite
447 include/linux/autoconf.h: ;
450 include $(srctree)/arch/$(ARCH)/Makefile
452 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
458 ifndef CONFIG_FRAME_POINTER
459 CFLAGS += -fomit-frame-pointer
462 ifdef CONFIG_DEBUG_INFO
466 # warn about C99 declaration after statement
467 CFLAGS += $(call check_gcc,-Wdeclaration-after-statement,)
470 # INSTALL_PATH specifies where to place the updated kernel and system map
471 # images. Uncomment if you want to place them anywhere other than root.
474 #export INSTALL_PATH=/boot
477 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
478 # relocations required by build roots. This is not defined in the
479 # makefile but the arguement can be passed to make if needed.
482 MODLIB := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
486 ifeq ($(KBUILD_EXTMOD),)
487 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/
489 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
490 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
491 $(net-y) $(net-m) $(libs-y) $(libs-m)))
493 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
495 $(core-n) $(core-) $(drivers-n) $(drivers-) \
496 $(net-n) $(net-) $(libs-n) $(libs-))))
498 init-y := $(patsubst %/, %/built-in.o, $(init-y))
499 core-y := $(patsubst %/, %/built-in.o, $(core-y))
500 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
501 net-y := $(patsubst %/, %/built-in.o, $(net-y))
502 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
503 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
504 libs-y := $(libs-y1) $(libs-y2)
507 # ---------------------------------------------------------------------------
509 # This is a bit tricky: If we need to relink vmlinux, we want
510 # the version number incremented, which means recompile init/version.o
511 # and relink init/init.o. However, we cannot do this during the
512 # normal descending-into-subdirs phase, since at that time
513 # we cannot yet know if we will need to relink vmlinux.
514 # So we descend into init/ inside the rule for vmlinux again.
516 vmlinux-objs := $(head-y) $(init-y) $(core-y) $(libs-y) $(drivers-y) $(net-y)
518 quiet_cmd_vmlinux__ = LD $@
520 $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) $(head-y) $(init-y) \
527 $(filter .tmp_kallsyms%,$^) \
531 # set -e makes the rule exit immediately on error
533 define rule_vmlinux__
535 $(if $(filter .tmp_kallsyms%,$^),, \
536 echo ' GEN .version'; \
537 . $(srctree)/scripts/mkversion > .tmp_version; \
538 mv -f .tmp_version .version; \
539 $(MAKE) $(build)=init; \
541 $(if $($(quiet)cmd_vmlinux__), \
542 echo ' $($(quiet)cmd_vmlinux__)' &&) \
544 echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
549 $(NM) $@ | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > System.map
552 LDFLAGS_vmlinux += -T arch/$(ARCH)/kernel/vmlinux.lds.s
554 # Generate section listing all symbols and add it into vmlinux
555 # It's a three stage process:
556 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
558 # Running kallsyms on that gives us .tmp_kallsyms1.o with
560 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
561 # but due to the added section, some addresses have shifted
562 # From here, we generate a correct .tmp_kallsyms2.o
563 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
565 ifdef CONFIG_KALLSYMS
567 kallsyms.o := .tmp_kallsyms2.o
569 quiet_cmd_kallsyms = KSYM $@
570 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) $(foreach x,$(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
572 .tmp_kallsyms1.o .tmp_kallsyms2.o: %.o: %.S scripts FORCE
573 $(call if_changed_dep,as_o_S)
575 .tmp_kallsyms%.S: .tmp_vmlinux%
578 .tmp_vmlinux1: $(vmlinux-objs) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
579 +$(call if_changed_rule,vmlinux__)
581 .tmp_vmlinux2: $(vmlinux-objs) .tmp_kallsyms1.o arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
582 $(call if_changed_rule,vmlinux__)
586 # Finally the vmlinux rule
588 vmlinux: $(vmlinux-objs) $(kallsyms.o) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
589 $(call if_changed_rule,vmlinux)
591 # The actual objects are generated when descending,
592 # make sure no implicit rule kicks in
594 $(sort $(vmlinux-objs)) arch/$(ARCH)/kernel/vmlinux.lds.s: $(vmlinux-dirs) ;
596 # Handle descending into subdirectories listed in $(vmlinux-dirs)
598 .PHONY: $(vmlinux-dirs)
599 $(vmlinux-dirs): prepare-all scripts
600 $(Q)$(MAKE) $(build)=$@
602 # Things we need to do before we recursively start building the kernel
603 # or the modules are listed in "prepare-all".
604 # A multi level approach is used. prepare1 is updated first, then prepare0.
605 # prepare-all is the collection point for the prepare targets.
607 .PHONY: prepare-all prepare prepare0 prepare1
609 # prepare1 is used to check if we are building in a separate output directory,
611 # 1) Check that make has not been executed in the kernel src $(srctree)
612 # 2) Create the include2 directory, used for the second asm symlink
615 ifneq ($(KBUILD_SRC),)
616 @echo ' Using $(srctree) as source for kernel'
617 $(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
618 echo " $(srctree) is not clean, please run 'make mrproper'";\
619 echo " in the '$(srctree)' directory.";\
622 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
623 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
626 prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
627 ifneq ($(KBUILD_MODULES),)
628 $(Q)rm -rf $(MODVERDIR)
629 $(Q)mkdir -p $(MODVERDIR)
632 # All the preparing..
633 prepare-all: prepare0 prepare
635 # Leave this as default for preprocessing vmlinux.lds.S, which is now
636 # done in arch/$(ARCH)/kernel/Makefile
638 export AFLAGS_vmlinux.lds.o += -P -C -U$(ARCH)
641 # ---------------------------------------------------------------------------
643 %.s: %.c scripts FORCE
644 $(Q)$(MAKE) $(build)=$(@D) $@
645 %.i: %.c scripts FORCE
646 $(Q)$(MAKE) $(build)=$(@D) $@
647 %.o: %.c scripts FORCE
648 $(Q)$(MAKE) $(build)=$(@D) $@
649 %/: scripts prepare FORCE
650 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
651 %.lst: %.c scripts FORCE
652 $(Q)$(MAKE) $(build)=$(@D) $@
653 %.s: %.S scripts FORCE
654 $(Q)$(MAKE) $(build)=$(@D) $@
655 %.o: %.S scripts FORCE
656 $(Q)$(MAKE) $(build)=$(@D) $@
658 # FIXME: The asm symlink changes when $(ARCH) changes. That's
659 # hard to detect, but I suppose "make mrproper" is a good idea
660 # before switching between archs anyway.
663 @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
664 $(Q)if [ ! -d include ]; then mkdir -p include; fi;
665 @ln -fsn asm-$(ARCH) $@
667 # Split autoconf.h into include/linux/config/*
669 include/config/MARKER: include/linux/autoconf.h
670 @echo ' SPLIT include/linux/autoconf.h -> include/config/*'
671 @scripts/basic/split-include include/linux/autoconf.h include/config
674 # Generate some files
675 # ---------------------------------------------------------------------------
677 # version.h changes when $(KERNELRELEASE) etc change, as defined in
682 define filechk_version.h
683 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
684 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
687 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
688 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
689 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
693 include/linux/version.h: Makefile
694 $(call filechk,version.h)
696 # ---------------------------------------------------------------------------
700 @echo '*** Warning: make $@ is unnecessary now.'
702 # ---------------------------------------------------------------------------
707 # By default, build modules as well
714 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
715 @echo ' Building modules, stage 2.';
716 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
719 # Target to prepare building external modules
720 .PHONY: modules_prepare
721 modules_prepare: prepare-all scripts
723 # Target to install modules
724 .PHONY: modules_install
725 modules_install: _modinst_ _modinst_post
729 @if [ -z "`$(DEPMOD) -V | grep module-init-tools`" ]; then \
730 echo "Warning: you may need to install module-init-tools"; \
731 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
734 @rm -rf $(MODLIB)/kernel
735 @rm -f $(MODLIB)/build
736 @mkdir -p $(MODLIB)/kernel
737 @ln -s $(TOPDIR) $(MODLIB)/build
738 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
740 # If System.map exists, run depmod. This deliberately does not have a
741 # dependency on System.map since that would run the dependency tree on
742 # vmlinux. This depmod is only for convenience to give the initial
743 # boot a modules.dep even before / is mounted read-write. However the
744 # boot script depmod is the master version.
745 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
748 depmod_opts := -b $(INSTALL_MOD_PATH) -r
750 .PHONY: _modinst_post
751 _modinst_post: _modinst_
752 if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
754 else # CONFIG_MODULES
756 # Modules not configured
757 # ---------------------------------------------------------------------------
759 modules modules_install: FORCE
761 @echo "The present kernel configuration has modules disabled."
762 @echo "Type 'make config' and enable loadable module support."
763 @echo "Then build a kernel with module support enabled."
767 endif # CONFIG_MODULES
769 # Generate asm-offsets.h
770 # ---------------------------------------------------------------------------
772 define filechk_gen-asm-offsets
774 echo "#ifndef __ASM_OFFSETS_H__"; \
775 echo "#define __ASM_OFFSETS_H__"; \
777 echo " * DO NOT MODIFY."; \
779 echo " * This file was generated by arch/$(ARCH)/Makefile"; \
783 sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
790 # Cleaning is done on three levels.
791 # make clean Delete most generated files
792 # Leave enough to build external modules
793 # make mrproper Delete the current configuration, and all generated files
794 # make distclean Remove editor backup files, patch leftover files and the like
796 # Directories & files removed with 'make clean'
797 CLEAN_DIRS += $(MODVERDIR)
798 CLEAN_FILES += vmlinux System.map kernel.spec \
799 .tmp_kallsyms* .tmp_version .tmp_vmlinux*
801 # Directories & files removed with 'make mrproper'
802 MRPROPER_DIRS += include/config include2
803 MRPROPER_FILES += .config .config.old include/asm .version \
804 include/linux/autoconf.h include/linux/version.h \
805 Module.symvers tags TAGS cscope*
807 # clean - Delete most, but leave enough to build external modules
809 clean: rm-dirs := $(CLEAN_DIRS)
810 clean: rm-files := $(CLEAN_FILES)
811 clean-dirs := $(addprefix _clean_,$(vmlinux-alldirs))
813 .PHONY: $(clean-dirs) clean archclean
815 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
817 clean: archclean $(clean-dirs)
820 @find . $(RCS_FIND_IGNORE) \
821 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
822 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
823 -type f -print | xargs rm -f
825 # mrproper - Delete all generated files, including .config
827 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
828 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
829 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
831 .PHONY: $(mrproper-dirs) mrproper archmrproper
833 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
835 mrproper: clean archmrproper $(mrproper-dirs)
844 @find . $(RCS_FIND_IGNORE) \
845 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
846 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
847 -o -name '.*.rej' -o -size 0 \
848 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
849 -type f -print | xargs rm -f
852 # ---------------------------------------------------------------------------
856 # Remove hyphens since they have special meaning in RPM filenames
857 KERNELPATH=kernel-$(subst -,,$(KERNELRELEASE))
859 # If you do a make spec before packing the tarball you can rpm -ta it
862 $(CONFIG_SHELL) $(srctree)/scripts/mkspec > $(objtree)/kernel.spec
864 # a) Build a tar ball
865 # b) generate an rpm from it
866 # c) and pack the result
867 # - Use /. to avoid tar packing just the symlink
872 ln -sf $(srctree) $(KERNELPATH) ; \
873 tar -cvz $(RCS_TAR_IGNORE) -f $(KERNELPATH).tar.gz $(KERNELPATH)/. ; \
877 $(CONFIG_SHELL) $(srctree)/scripts/mkversion > $(objtree)/.tmp_version;\
878 mv -f $(objtree)/.tmp_version $(objtree)/.version;
880 $(RPM) --target $(UTS_MACHINE) -ta ../$(KERNELPATH).tar.gz
881 rm ../$(KERNELPATH).tar.gz
883 # Brief documentation of the typical targets used
884 # ---------------------------------------------------------------------------
886 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
887 boards := $(notdir $(boards))
890 @echo 'Cleaning targets:'
891 @echo ' clean - remove most generated files but keep the config'
892 @echo ' mrproper - remove all generated files + config + various backup files'
894 @echo 'Configuration targets:'
895 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
897 @echo 'Other generic targets:'
898 @echo ' all - Build all targets marked with [*]'
899 @echo '* vmlinux - Build the bare kernel'
900 @echo '* modules - Build all modules'
901 @echo ' modules_install - Install all modules'
902 @echo ' dir/ - Build all files in dir and below'
903 @echo ' dir/file.[ois] - Build specified target only'
904 @echo ' rpm - Build a kernel as an RPM package'
905 @echo ' tags/TAGS - Generate tags file for editors'
906 @echo ' cscope - Generate cscope index'
908 @echo 'Documentation targets:'
909 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
911 @echo 'Architecture specific targets ($(ARCH)):'
912 @$(if $(archhelp),$(archhelp),\
913 echo ' No architecture specific help defined for $(ARCH)')
916 $(foreach b, $(boards), \
917 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
920 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
921 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
922 @echo ' make C=1 [targets] Check all c source with checker tool'
924 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
925 @echo 'For further info see the ./README file'
928 # Documentation targets
929 # ---------------------------------------------------------------------------
930 %docs: scripts_basic FORCE
931 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
936 # External module support.
937 # When building external modules the kernel used as basis is considered
938 # read-only, and no consistency checks are made and the make
939 # system is not used on the basis kernel. If updates are required
940 # in the basis kernel ordinary make commands (without M=...) must
943 # The following are the only valid targets when building external
945 # make M=dir clean Delete all automatically generated files
946 # make M=dir modules Make all modules in specified dir
947 # make M=dir Same as 'make M=dir modules'
948 # make M=dir modules_install
949 # Install the modules build in the module directory
950 # Assumes install directory is already created
952 # We are always building modules
956 $(Q)mkdir -p $(MODVERDIR)
958 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
959 .PHONY: $(module-dirs) modules
960 $(module-dirs): crmodverdir
961 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
963 modules: $(module-dirs)
964 @echo ' Building modules, stage 2.';
965 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
967 .PHONY: modules_install
969 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
971 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
973 .PHONY: $(clean-dirs) clean
975 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
977 clean: rm-dirs := $(MODVERDIR)
980 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
981 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
982 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
983 -type f -print | xargs rm -f
986 @echo ' Building external modules.'
987 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
989 @echo ' modules - default target, build the module(s)'
990 @echo ' modules_install - install the module'
991 @echo ' clean - remove generated files in module directory only'
993 endif # KBUILD_EXTMOD
995 # Generate tags for editors
996 # ---------------------------------------------------------------------------
999 ( find . $(RCS_FIND_IGNORE) \
1000 \( -name include -o -name arch \) -prune -o \
1001 -name '*.[chS]' -print; \
1002 find arch/$(ARCH) $(RCS_FIND_IGNORE) \
1003 -name '*.[chS]' -print; \
1004 find security/selinux/include $(RCS_FIND_IGNORE) \
1005 -name '*.[chS]' -print; \
1006 find include $(RCS_FIND_IGNORE) \
1007 \( -name config -o -name 'asm-*' \) -prune \
1008 -o -name '*.[chS]' -print; \
1009 find include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
1010 -name '*.[chS]' -print; \
1011 find include/asm-generic $(RCS_FIND_IGNORE) \
1012 -name '*.[chS]' -print )
1015 quiet_cmd_cscope-file = FILELST cscope.files
1016 cmd_cscope-file = $(all-sources) > cscope.files
1018 quiet_cmd_cscope = MAKE cscope.out
1019 cmd_cscope = cscope -k -b -q
1022 $(call cmd,cscope-file)
1025 quiet_cmd_TAGS = MAKE $@
1026 cmd_TAGS = $(all-sources) | etags -
1028 # Exuberant ctags works better with -I
1030 quiet_cmd_tags = MAKE $@
1033 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
1034 $(all-sources) | xargs ctags $$CTAGSF -a
1044 # Scripts to check various things for consistency
1045 # ---------------------------------------------------------------------------
1048 find * $(RCS_FIND_IGNORE) \
1049 -name '*.[hcS]' -type f -print | sort \
1050 | xargs $(PERL) -w scripts/checkconfig.pl
1053 find * $(RCS_FIND_IGNORE) \
1054 -name '*.[hcS]' -type f -print | sort \
1055 | xargs $(PERL) -w scripts/checkincludes.pl
1058 find * $(RCS_FIND_IGNORE) \
1059 -name '*.[hcS]' -type f -print | sort \
1060 | xargs $(PERL) -w scripts/checkversion.pl
1063 $(PERL) scripts/reference_discarded.pl
1065 endif #ifeq ($(config-targets),1)
1066 endif #ifeq ($(mixed-targets),1)
1070 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1071 $(PERL) scripts/checkstack.pl $(ARCH)
1073 # FIXME Should go into a make.lib or something
1074 # ===========================================================================
1076 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1077 cmd_rmdirs = rm -rf $(rm-dirs)
1079 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1080 cmd_rmfiles = rm -f $(rm-files)
1083 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1084 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1085 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1087 quiet_cmd_as_o_S = AS $@
1088 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1090 # read all saved command lines
1092 targets := $(wildcard $(sort $(targets)))
1093 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1095 ifneq ($(cmd_files),)
1096 $(cmd_files): ; # Do not try to update included dependency files
1097 include $(cmd_files)
1100 # execute the command and also postprocess generated .d dependencies
1103 if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
1104 $(filter-out $(cmd_$(1)),$(cmd_$@))\
1105 $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1107 $(if $($(quiet)cmd_$(1)),echo ' $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1109 scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
1111 mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
1113 # Usage: $(call if_changed_rule,foo)
1114 # will check if $(cmd_foo) changed, or any of the prequisites changed,
1115 # and if so will execute $(rule_foo)
1117 if_changed_rule = $(if $(strip $? \
1118 $(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
1119 $(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
1122 # If quiet is set, only print short version of command
1124 cmd = @$(if $($(quiet)cmd_$(1)),echo ' $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
1126 # filechk is used to check if the content of a generated file is updated.
1128 # define filechk_sample
1129 # echo $KERNELRELEASE
1131 # version.h : Makefile
1132 # $(call filechk,sample)
1133 # The rule defined shall write to stdout the content of the new file.
1134 # The existing file will be compared with the new one.
1135 # - If no file exist it is created
1136 # - If the content differ the new file is used
1137 # - If they are equal no change, and no timestamp update
1142 mkdir -p $(dir $@); \
1143 $(filechk_$(1)) < $< > $@.tmp; \
1144 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
1152 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1154 # $(Q)$(MAKE) $(build)=dir
1155 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
1157 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1159 # $(Q)$(MAKE) $(clean)=dir
1160 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1162 # $(call descend,<dir>,<target>)
1163 # Recursively call a sub-make in <dir> with target <target>
1164 # Usage is deprecated, because make does not see this as an invocation of make.
1165 descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
1167 endif # skip-makefile