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.
14 # o use make's built-in rules and variables
15 # (this increases performance and avoids hard-to-debug behaviour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
19 # Avoid funny character set dependencies
23 export LC_COLLATE LC_NUMERIC
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.o targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 # To put more focus on warnings, be less verbose as default
42 # Use 'make V=1' to see the full commands
44 ifeq ("$(origin V)", "command line")
51 # Call a source code checker (by default, "sparse") as part of the
54 # Use 'make C=1' to enable checking of only re-compiled files.
55 # Use 'make C=2' to enable checking of *all* source files, regardless
56 # of whether they are re-compiled or not.
58 # See the file "Documentation/sparse.txt" for more details, including
59 # where to get the "sparse" utility.
61 ifeq ("$(origin C)", "command line")
62 KBUILD_CHECKSRC = $(C)
64 ifndef KBUILD_CHECKSRC
68 # Use make M=dir to specify directory of external module to build
69 # Old syntax make ... SUBDIRS=$PWD is still supported
70 # Setting the environment variable KBUILD_EXTMOD take precedence
72 KBUILD_EXTMOD ?= $(SUBDIRS)
75 ifeq ("$(origin M)", "command line")
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
83 # Use "make O=dir/to/store/output/files/"
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
99 # OK, Make called in directory where kernel src resides
100 # Do we want to locate output files in a separate directory?
101 ifeq ("$(origin O)", "command line")
102 KBUILD_OUTPUT := $(O)
105 # That's our default target when none is given on the command line
109 # Cancel implicit rules on top Makefile
110 $(CURDIR)/Makefile Makefile: ;
112 ifneq ($(KBUILD_OUTPUT),)
113 # Invoke a second make in the output directory, passing relevant variables
114 # check that the output directory actually exists
115 saved-output := $(KBUILD_OUTPUT)
116 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
117 $(if $(KBUILD_OUTPUT),, \
118 $(error output directory "$(saved-output)" does not exist))
120 PHONY += $(MAKECMDGOALS) sub-make
122 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
126 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
127 KBUILD_SRC=$(CURDIR) \
128 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
129 $(filter-out _all sub-make,$(MAKECMDGOALS))
131 # Leave processing to above invocation of make
133 endif # ifneq ($(KBUILD_OUTPUT),)
134 endif # ifeq ($(KBUILD_SRC),)
136 # We process the rest of the Makefile if this is the final invocation of make
137 ifeq ($(skip-makefile),)
139 # If building an external module we do not care about the all: rule
140 # but instead _all depend on modules
142 ifeq ($(KBUILD_EXTMOD),)
148 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
153 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
155 export srctree objtree VPATH
158 # SUBARCH tells the usermode build what the underlying arch is. That is set
159 # first, and if a usermode build is happening, the "ARCH=um" on the command
160 # line overrides the setting of ARCH below. If a native build is happening,
161 # then ARCH is assigned, getting whatever value it gets normally, and
162 # SUBARCH is subsequently ignored.
164 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
165 -e s/arm.*/arm/ -e s/sa110/arm/ \
166 -e s/s390x/s390/ -e s/parisc64/parisc/ \
167 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
170 # Cross compiling and selecting different set of gcc/bin-utils
171 # ---------------------------------------------------------------------------
173 # When performing cross compilation for other architectures ARCH shall be set
174 # to the target architecture. (See arch/* for the possibilities).
175 # ARCH can be set during invocation of make:
177 # Another way is to have ARCH set in the environment.
178 # The default ARCH is the host where make is executed.
180 # CROSS_COMPILE specify the prefix used for all executables used
181 # during compilation. Only gcc and related bin-utils executables
182 # are prefixed with $(CROSS_COMPILE).
183 # CROSS_COMPILE can be set on the command line
184 # make CROSS_COMPILE=ia64-linux-
185 # Alternatively CROSS_COMPILE can be set in the environment.
186 # A third alternative is to store a setting in .config so that plain
187 # "make" in the configured kernel build directory always uses that.
188 # Default value for CROSS_COMPILE is not to prefix executables
189 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
190 export KBUILD_BUILDHOST := $(SUBARCH)
193 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
195 # Architecture as present in compile.h
196 UTS_MACHINE := $(ARCH)
199 # Additional ARCH settings for x86
203 ifeq ($(ARCH),x86_64)
207 # Additional ARCH settings for sparc
208 ifeq ($(ARCH),sparc64)
212 # Additional ARCH settings for sh
217 # Where to locate arch specific headers
218 hdr-arch := $(SRCARCH)
220 ifeq ($(ARCH),m68knommu)
224 KCONFIG_CONFIG ?= .config
226 # SHELL used by kbuild
227 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
228 else if [ -x /bin/bash ]; then echo /bin/bash; \
229 else echo sh; fi ; fi)
233 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
236 # Decide whether to build built-in, modular, or both.
237 # Normally, just do built-in.
242 # If we have only "make modules", don't compile built-in objects.
243 # When we're building modules with modversions, we need to consider
244 # the built-in objects during the descend as well, in order to
245 # make sure the checksums are up to date before we record them.
247 ifeq ($(MAKECMDGOALS),modules)
248 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
251 # If we have "make <whatever> modules", compile modules
252 # in addition to whatever we do anyway.
253 # Just "make" or "make all" shall build modules as well
255 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
259 ifeq ($(MAKECMDGOALS),)
263 export KBUILD_MODULES KBUILD_BUILTIN
264 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
267 # ---------------------------------------------------------------------------
269 # Normally, we echo the whole command before executing it. By making
270 # that echo $($(quiet)$(cmd)), we now have the possibility to set
271 # $(quiet) to choose other forms of output instead, e.g.
273 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
274 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
276 # If $(quiet) is empty, the whole command will be printed.
277 # If it is set to "quiet_", only the short version will be printed.
278 # If it is set to "silent_", nothing will be printed at all, since
279 # the variable $(silent_cmd_cc_o_c) doesn't exist.
281 # A simple variant is to prefix commands with $(Q) - that's useful
282 # for commands that shall be hidden in non-verbose mode.
286 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
287 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
289 ifeq ($(KBUILD_VERBOSE),1)
297 # If the user is running make -s (silent mode), suppress echoing of
300 ifneq ($(findstring s,$(MAKEFLAGS)),)
304 export quiet Q KBUILD_VERBOSE
307 # Look for make include files relative to root of kernel src
308 MAKEFLAGS += --include-dir=$(srctree)
310 # We need some generic definitions (do not try to remake the file).
311 $(srctree)/scripts/Kbuild.include: ;
312 include $(srctree)/scripts/Kbuild.include
314 # Make variables (CC, etc...)
316 AS = $(CROSS_COMPILE)as
317 LD = $(CROSS_COMPILE)ld
318 CC = $(CROSS_COMPILE)gcc
320 AR = $(CROSS_COMPILE)ar
321 NM = $(CROSS_COMPILE)nm
322 STRIP = $(CROSS_COMPILE)strip
323 OBJCOPY = $(CROSS_COMPILE)objcopy
324 OBJDUMP = $(CROSS_COMPILE)objdump
326 GENKSYMS = scripts/genksyms/genksyms
327 INSTALLKERNEL := installkernel
328 DEPMOD = /sbin/depmod
329 KALLSYMS = scripts/kallsyms
333 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
334 -Wbitwise -Wno-return-void $(CF)
336 CFLAGS_MODULE = $(MODFLAGS)
337 AFLAGS_MODULE = $(MODFLAGS)
338 LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds
341 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
344 # Use LINUXINCLUDE when you must reference the include/ directory.
345 # Needed to be compatible with the O= option
346 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
347 $(if $(KBUILD_SRC), -I$(srctree)/include) \
348 -include include/generated/autoconf.h
350 KBUILD_CPPFLAGS := -D__KERNEL__
352 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
353 -fno-strict-aliasing -fno-common \
354 -Werror-implicit-function-declaration \
355 -Wno-format-security \
356 -fno-delete-null-pointer-checks
357 KBUILD_AFLAGS := -D__ASSEMBLY__
359 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
360 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
361 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
363 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
364 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
365 export CPP AR NM STRIP OBJCOPY OBJDUMP
366 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
367 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
369 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
370 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
371 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
373 # When compiling out-of-tree modules, put MODVERDIR in the module
374 # tree rather than in the kernel tree. The kernel tree might
376 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
378 # Files to ignore in find ... statements
380 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
381 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
383 # ===========================================================================
384 # Rules shared between *config targets and build targets
386 # Basic helpers built in scripts/
387 PHONY += scripts_basic
389 $(Q)$(MAKE) $(build)=scripts/basic
390 $(Q)rm -f .tmp_quiet_recordmcount
392 # To avoid any implicit rule to kick in, define an empty command.
393 scripts/basic/%: scripts_basic ;
395 PHONY += outputmakefile
396 # outputmakefile generates a Makefile in the output directory, if using a
397 # separate output directory. This allows convenient use of make in the
400 ifneq ($(KBUILD_SRC),)
401 $(Q)ln -fsn $(srctree) source
402 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
403 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
406 # To make sure we do not include .config for any of the *config targets
407 # catch them early, and hand them over to scripts/kconfig/Makefile
408 # It is allowed to specify more targets when calling make, including
409 # mixing *config targets and build targets.
410 # For example 'make oldconfig all'.
411 # Detect when mixed targets is specified, and make a second invocation
412 # of make so .config is not included in this case either (for *config).
414 no-dot-config-targets := clean mrproper distclean \
415 cscope TAGS tags help %docs check% \
416 include/linux/version.h headers_% \
417 kernelrelease kernelversion
423 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
424 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
429 ifeq ($(KBUILD_EXTMOD),)
430 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
432 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
438 ifeq ($(mixed-targets),1)
439 # ===========================================================================
440 # We're called with mixed targets (*config and build targets).
441 # Handle them one by one.
444 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
447 ifeq ($(config-targets),1)
448 # ===========================================================================
449 # *config targets only - make sure prerequisites are updated, and descend
450 # in scripts/kconfig to make the *config target
452 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
453 # KBUILD_DEFCONFIG may point out an alternative default configuration
454 # used for 'make defconfig'
455 include $(srctree)/arch/$(SRCARCH)/Makefile
456 export KBUILD_DEFCONFIG KBUILD_KCONFIG
458 config: scripts_basic outputmakefile FORCE
459 $(Q)mkdir -p include/linux include/config
460 $(Q)$(MAKE) $(build)=scripts/kconfig $@
462 %config: scripts_basic outputmakefile FORCE
463 $(Q)mkdir -p include/linux include/config
464 $(Q)$(MAKE) $(build)=scripts/kconfig $@
467 # ===========================================================================
468 # Build targets only - this includes vmlinux, arch specific targets, clean
469 # targets and others. In general all targets except *config targets.
471 ifeq ($(KBUILD_EXTMOD),)
472 # Additional helpers built in scripts/
473 # Carefully list dependencies so we do not try to build scripts twice
476 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
477 $(Q)$(MAKE) $(build)=$(@)
479 # Objects we will link into vmlinux / subdirs we need to visit
481 drivers-y := drivers/ sound/ firmware/
485 endif # KBUILD_EXTMOD
487 ifeq ($(dot-config),1)
489 -include include/config/auto.conf
491 ifeq ($(KBUILD_EXTMOD),)
492 # Read in dependencies to all Kconfig* files, make sure to run
493 # oldconfig if changes are detected.
494 -include include/config/auto.conf.cmd
496 # To avoid any implicit rule to kick in, define an empty command
497 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
499 # If .config is newer than include/config/auto.conf, someone tinkered
500 # with it and forgot to run make oldconfig.
501 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
502 # we execute the config step to be sure to catch updated Kconfig files
503 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
504 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
506 # external modules needs include/generated/autoconf.h and include/config/auto.conf
507 # but do not care if they are up-to-date. Use auto.conf to trigger the test
508 PHONY += include/config/auto.conf
510 include/config/auto.conf:
511 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
513 echo " ERROR: Kernel configuration is invalid."; \
514 echo " include/generated/autoconf.h or $@ are missing.";\
515 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
519 endif # KBUILD_EXTMOD
522 # Dummy target needed, because used as prerequisite
523 include/config/auto.conf: ;
524 endif # $(dot-config)
526 # The all: target is the default when no target is given on the
528 # This allow a user to issue only 'make' to build a kernel including modules
529 # Defaults vmlinux but it is usually overridden in the arch makefile
532 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
538 include $(srctree)/arch/$(SRCARCH)/Makefile
540 ifneq ($(CONFIG_FRAME_WARN),0)
541 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
544 # Force gcc to behave correct even for buggy distributions
545 ifndef CONFIG_CC_STACKPROTECTOR
546 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
549 ifdef CONFIG_FRAME_POINTER
550 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
552 KBUILD_CFLAGS += -fomit-frame-pointer
555 ifdef CONFIG_DEBUG_INFO
557 KBUILD_AFLAGS += -gdwarf-2
560 ifdef CONFIG_FUNCTION_TRACER
564 # We trigger additional mismatches with less inlining
565 ifdef CONFIG_DEBUG_SECTION_MISMATCH
566 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
569 # arch Makefile may override CC so keep this after arch Makefile is included
570 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
571 CHECKFLAGS += $(NOSTDINC_FLAGS)
573 # warn about C99 declaration after statement
574 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
576 # disable pointer signed / unsigned warnings in gcc 4.0
577 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
579 # disable invalid "can't wrap" optimizations for signed / pointers
580 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
582 # conserve stack if available
583 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
585 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
586 # But warn user when we do so
588 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
590 ifneq ($(KCPPFLAGS),)
591 $(call warn-assign,CPPFLAGS)
592 KBUILD_CPPFLAGS += $(KCPPFLAGS)
595 $(call warn-assign,AFLAGS)
596 KBUILD_AFLAGS += $(KAFLAGS)
599 $(call warn-assign,CFLAGS)
600 KBUILD_CFLAGS += $(KCFLAGS)
603 # Use --build-id when available.
604 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
605 $(call cc-ldoption, -Wl$(comma)--build-id,))
606 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
607 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
609 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
610 LDFLAGS_vmlinux += $(call ld-option, -X,)
613 # Default kernel image to build when no specific target is given.
614 # KBUILD_IMAGE may be overruled on the command line or
615 # set in the environment
616 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
618 export KBUILD_IMAGE ?= vmlinux
621 # INSTALL_PATH specifies where to place the updated kernel and system map
622 # images. Default is /boot, but you can set it to other values
623 export INSTALL_PATH ?= /boot
626 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
627 # relocations required by build roots. This is not defined in the
628 # makefile but the argument can be passed to make if needed.
631 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
635 # INSTALL_MOD_STRIP, if defined, will cause modules to be
636 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
637 # the default option --strip-debug will be used. Otherwise,
638 # INSTALL_MOD_STRIP will used as the options to the strip command.
640 ifdef INSTALL_MOD_STRIP
641 ifeq ($(INSTALL_MOD_STRIP),1)
642 mod_strip_cmd = $(STRIP) --strip-debug
644 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
645 endif # INSTALL_MOD_STRIP=1
648 endif # INSTALL_MOD_STRIP
652 ifeq ($(KBUILD_EXTMOD),)
653 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
655 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
656 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
657 $(net-y) $(net-m) $(libs-y) $(libs-m)))
659 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
661 $(core-n) $(core-) $(drivers-n) $(drivers-) \
662 $(net-n) $(net-) $(libs-n) $(libs-))))
664 init-y := $(patsubst %/, %/built-in.o, $(init-y))
665 core-y := $(patsubst %/, %/built-in.o, $(core-y))
666 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
667 net-y := $(patsubst %/, %/built-in.o, $(net-y))
668 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
669 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
670 libs-y := $(libs-y1) $(libs-y2)
673 # ---------------------------------------------------------------------------
674 # vmlinux is built from the objects selected by $(vmlinux-init) and
675 # $(vmlinux-main). Most are built-in.o files from top-level directories
676 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
677 # Ordering when linking is important, and $(vmlinux-init) must be first.
682 # +-< $(vmlinux-init)
683 # | +--< init/version.o + more
685 # +--< $(vmlinux-main)
686 # | +--< driver/built-in.o mm/built-in.o + more
688 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
690 # vmlinux version (uname -v) cannot be updated during normal
691 # descending-into-subdirs phase since we do not yet know if we need to
693 # Therefore this step is delayed until just before final link of vmlinux -
694 # except in the kallsyms case where it is done just before adding the
695 # symbols to the kernel.
697 # System.map is generated to document addresses of all kernel symbols
699 vmlinux-init := $(head-y) $(init-y)
700 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
701 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
702 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
703 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
705 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
706 # May be overridden by arch/$(ARCH)/Makefile
707 quiet_cmd_vmlinux__ ?= LD $@
708 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
709 -T $(vmlinux-lds) $(vmlinux-init) \
710 --start-group $(vmlinux-main) --end-group \
711 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
713 # Generate new vmlinux version
714 quiet_cmd_vmlinux_version = GEN .version
715 cmd_vmlinux_version = set -e; \
716 if [ ! -r .version ]; then \
720 mv .version .old_version; \
721 expr 0$$(cat .old_version) + 1 >.version; \
723 $(MAKE) $(build)=init
725 # Generate System.map
726 quiet_cmd_sysmap = SYSMAP
727 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
730 # If CONFIG_KALLSYMS is set .version is already updated
731 # Generate System.map and verify that the content is consistent
732 # Use + in front of the vmlinux_version rule to silent warning with make -j2
733 # First command is ':' to allow us to use + in front of the rule
734 define rule_vmlinux__
736 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
738 $(call cmd,vmlinux__)
739 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
741 $(Q)$(if $($(quiet)cmd_sysmap), \
742 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
743 $(cmd_sysmap) $@ System.map; \
744 if [ $$? -ne 0 ]; then \
752 ifdef CONFIG_KALLSYMS
753 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
754 # It's a three stage process:
755 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
757 # Running kallsyms on that gives us .tmp_kallsyms1.o with
758 # the right size - vmlinux version (uname -v) is updated during this step
759 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
760 # but due to the added section, some addresses have shifted.
761 # From here, we generate a correct .tmp_kallsyms2.o
762 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
763 # o Verify that the System.map from vmlinux matches the map from
764 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
765 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
766 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
767 # temporary bypass to allow the kernel to be built while the
768 # maintainers work out what went wrong with kallsyms.
770 ifdef CONFIG_KALLSYMS_EXTRA_PASS
776 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
778 define verify_kallsyms
779 $(Q)$(if $($(quiet)cmd_sysmap), \
780 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
781 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
782 $(Q)cmp -s System.map .tmp_System.map || \
783 (echo Inconsistent kallsyms data; \
784 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
785 rm .tmp_kallsyms* ; /bin/false )
788 # Update vmlinux version before link
789 # Use + in front of this rule to silent warning about make -j1
790 # First command is ':' to allow us to use + in front of this rule
791 cmd_ksym_ld = $(cmd_vmlinux__)
794 +$(call cmd,vmlinux_version)
795 $(call cmd,vmlinux__)
796 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
799 # Generate .S file with all kernel symbols
800 quiet_cmd_kallsyms = KSYM $@
801 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
802 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
804 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
805 $(call if_changed_dep,as_o_S)
807 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
810 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
811 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
812 $(call if_changed_rule,ksym_ld)
814 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
815 $(call if_changed,vmlinux__)
817 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
818 $(call if_changed,vmlinux__)
820 # Needs to visit scripts/ before $(KALLSYMS) can be used.
821 $(KALLSYMS): scripts ;
823 # Generate some data for debugging strange kallsyms problems
824 debug_kallsyms: .tmp_map$(last_kallsyms)
826 .tmp_map%: .tmp_vmlinux% FORCE
827 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
833 endif # ifdef CONFIG_KALLSYMS
835 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
836 # relevant sections renamed as per the linker script.
837 quiet_cmd_vmlinux-modpost = LD $@
838 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
839 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
840 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
841 define rule_vmlinux-modpost
843 +$(call cmd,vmlinux-modpost)
844 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
845 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
848 # vmlinux image - including updated kernel symbols
849 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
850 ifdef CONFIG_HEADERS_CHECK
851 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
854 $(Q)$(MAKE) $(build)=samples
856 ifdef CONFIG_BUILD_DOCSRC
857 $(Q)$(MAKE) $(build)=Documentation
859 $(call vmlinux-modpost)
860 $(call if_changed_rule,vmlinux__)
861 $(Q)rm -f .old_version
863 # build vmlinux.o first to catch section mismatch errors early
864 ifdef CONFIG_KALLSYMS
865 .tmp_vmlinux1: vmlinux.o
868 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
869 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
870 $(call if_changed_rule,vmlinux-modpost)
872 # The actual objects are generated when descending,
873 # make sure no implicit rule kicks in
874 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
876 # Handle descending into subdirectories listed in $(vmlinux-dirs)
877 # Preset locale variables to speed up the build process. Limit locale
878 # tweaks to this spot to avoid wrong language settings when running
879 # make menuconfig etc.
880 # Error messages still appears in the original language
882 PHONY += $(vmlinux-dirs)
883 $(vmlinux-dirs): prepare scripts
884 $(Q)$(MAKE) $(build)=$@
886 # Build the kernel release string
888 # The KERNELRELEASE value built here is stored in the file
889 # include/config/kernel.release, and is used when executing several
890 # make targets, such as "make install" or "make modules_install."
892 # The eventual kernel release string consists of the following fields,
893 # shown in a hierarchical format to show how smaller parts are concatenated
894 # to form the larger and final value, with values coming from places like
895 # the Makefile, kernel config options, make command line options and/or
896 # SCM tag information.
900 # $(PATCHLEVEL) eg, 6
902 # $(EXTRAVERSION) eg, -rc6
905 # localversion* (files without backups, containing '~')
906 # $(CONFIG_LOCALVERSION) (from kernel config setting)
907 # $(LOCALVERSION) (from make command line, if provided)
909 # $(scm-identifier) (unique SCM tag, if one exists)
910 # ./scripts/setlocalversion (only with CONFIG_LOCALVERSION_AUTO)
911 # .scmversion (only with CONFIG_LOCALVERSION_AUTO)
912 # + (only without CONFIG_LOCALVERSION_AUTO
913 # and without LOCALVERSION= and
914 # repository is at non-tagged commit)
916 # For kernels without CONFIG_LOCALVERSION_AUTO compiled from an SCM that has
917 # been revised beyond a tagged commit, `+' is appended to the version string
918 # when not overridden by using "make LOCALVERSION=". This indicates that the
919 # kernel is not a vanilla release version and has been modified.
921 pattern = ".*/localversion[^~]*"
922 string = $(shell cat /dev/null \
923 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
925 localver = $(subst $(space),, $(string) \
926 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
928 # scripts/setlocalversion is called to create a unique identifier if the source
929 # is managed by a known SCM and the repository has been revised since the last
930 # tagged (release) commit. The format of the identifier is determined by the
931 # SCM's implementation.
933 # .scmversion is used when generating rpm packages so we do not loose
934 # the version information from the SCM when we do the build of the kernel
935 # from the copied source
936 ifeq ($(wildcard .scmversion),)
937 scm-identifier = $(shell $(CONFIG_SHELL) \
938 $(srctree)/scripts/setlocalversion $(srctree))
940 scm-identifier = $(shell cat .scmversion 2> /dev/null)
943 ifdef CONFIG_LOCALVERSION_AUTO
944 localver-extra = $(scm-identifier)
946 ifneq ($(scm-identifier),)
947 ifeq ($(LOCALVERSION),)
953 localver-full = $(localver)$(LOCALVERSION)$(localver-extra)
955 # Store (new) KERNELRELASE string in include/config/kernel.release
956 kernelrelease = $(KERNELVERSION)$(localver-full)
957 include/config/kernel.release: include/config/auto.conf FORCE
959 $(Q)echo $(kernelrelease) > $@
962 # Things we need to do before we recursively start building the kernel
963 # or the modules are listed in "prepare".
964 # A multi level approach is used. prepareN is processed before prepareN-1.
965 # archprepare is used in arch Makefiles and when processed asm symlink,
966 # version.h and scripts_basic is processed / created.
968 # Listed in dependency order
969 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
971 # prepare3 is used to check if we are building in a separate output directory,
973 # 1) Check that make has not been executed in the kernel src $(srctree)
974 prepare3: include/config/kernel.release
975 ifneq ($(KBUILD_SRC),)
976 @$(kecho) ' Using $(srctree) as source for kernel'
977 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
978 echo " $(srctree) is not clean, please run 'make mrproper'";\
979 echo " in the '$(srctree)' directory.";\
984 # prepare2 creates a makefile if using a separate output directory
985 prepare2: prepare3 outputmakefile
987 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
988 include/config/auto.conf
991 archprepare: prepare1 scripts_basic
993 prepare0: archprepare FORCE
994 $(Q)$(MAKE) $(build)=.
995 $(Q)$(MAKE) $(build)=. missing-syscalls
997 # All the preparing..
1000 # Generate some files
1001 # ---------------------------------------------------------------------------
1003 # KERNELRELEASE can change from a few different places, meaning version.h
1004 # needs to be updated, so this check is forced on all builds
1007 define filechk_utsrelease.h
1008 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1009 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1012 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1015 define filechk_version.h
1016 (echo \#define LINUX_VERSION_CODE $(shell \
1017 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1018 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1021 include/linux/version.h: $(srctree)/Makefile FORCE
1022 $(call filechk,version.h)
1024 include/generated/utsrelease.h: include/config/kernel.release FORCE
1025 $(call filechk,utsrelease.h)
1029 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1031 # ---------------------------------------------------------------------------
1035 @echo '*** Warning: make $@ is unnecessary now.'
1037 # ---------------------------------------------------------------------------
1039 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1040 export INSTALL_FW_PATH
1042 PHONY += firmware_install
1043 firmware_install: FORCE
1044 @mkdir -p $(objtree)/firmware
1045 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1047 # ---------------------------------------------------------------------------
1050 #Default location for installed headers
1051 export INSTALL_HDR_PATH = $(objtree)/usr
1053 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1055 # If we do an all arch process set dst to asm-$(hdr-arch)
1056 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1059 __headers: include/linux/version.h scripts_basic FORCE
1060 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1062 PHONY += headers_install_all
1063 headers_install_all:
1064 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1066 PHONY += headers_install
1067 headers_install: __headers
1068 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1069 $(error Headers not exportable for the $(SRCARCH) architecture))
1070 $(Q)$(MAKE) $(hdr-inst)=include
1071 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1073 PHONY += headers_check_all
1074 headers_check_all: headers_install_all
1075 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1077 PHONY += headers_check
1078 headers_check: headers_install
1079 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1080 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1082 # ---------------------------------------------------------------------------
1085 ifdef CONFIG_MODULES
1087 # By default, build modules as well
1093 # A module can be listed more than once in obj-m resulting in
1094 # duplicate lines in modules.order files. Those are removed
1095 # using awk while concatenating to the final file.
1098 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1099 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1100 @$(kecho) ' Building modules, stage 2.';
1101 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1102 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1104 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1105 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1107 %/modules.builtin: include/config/auto.conf
1108 $(Q)$(MAKE) $(modbuiltin)=$*
1111 # Target to prepare building external modules
1112 PHONY += modules_prepare
1113 modules_prepare: prepare scripts
1115 # Target to install modules
1116 PHONY += modules_install
1117 modules_install: _modinst_ _modinst_post
1121 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1122 echo "Warning: you may need to install module-init-tools"; \
1123 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1126 @rm -rf $(MODLIB)/kernel
1127 @rm -f $(MODLIB)/source
1128 @mkdir -p $(MODLIB)/kernel
1129 @ln -s $(srctree) $(MODLIB)/source
1130 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1131 rm -f $(MODLIB)/build ; \
1132 ln -s $(objtree) $(MODLIB)/build ; \
1134 @cp -f $(objtree)/modules.order $(MODLIB)/
1135 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1136 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1138 # This depmod is only for convenience to give the initial
1139 # boot a modules.dep even before / is mounted read-write. However the
1140 # boot script depmod is the master version.
1141 PHONY += _modinst_post
1142 _modinst_post: _modinst_
1143 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1146 else # CONFIG_MODULES
1148 # Modules not configured
1149 # ---------------------------------------------------------------------------
1151 modules modules_install: FORCE
1153 @echo "The present kernel configuration has modules disabled."
1154 @echo "Type 'make config' and enable loadable module support."
1155 @echo "Then build a kernel with module support enabled."
1159 endif # CONFIG_MODULES
1162 # Cleaning is done on three levels.
1163 # make clean Delete most generated files
1164 # Leave enough to build external modules
1165 # make mrproper Delete the current configuration, and all generated files
1166 # make distclean Remove editor backup files, patch leftover files and the like
1168 # Directories & files removed with 'make clean'
1169 CLEAN_DIRS += $(MODVERDIR)
1170 CLEAN_FILES += vmlinux System.map \
1171 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1173 # Directories & files removed with 'make mrproper'
1174 MRPROPER_DIRS += include/config usr/include include/generated
1175 MRPROPER_FILES += .config .config.old .version .old_version \
1176 include/linux/version.h \
1177 Module.symvers tags TAGS cscope*
1179 # clean - Delete most, but leave enough to build external modules
1181 clean: rm-dirs := $(CLEAN_DIRS)
1182 clean: rm-files := $(CLEAN_FILES)
1183 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1185 PHONY += $(clean-dirs) clean archclean
1187 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1189 clean: archclean $(clean-dirs)
1192 @find . $(RCS_FIND_IGNORE) \
1193 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1194 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1195 -o -name '*.symtypes' -o -name 'modules.order' \
1196 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1197 -o -name '*.gcno' \) -type f -print | xargs rm -f
1199 # mrproper - Delete all generated files, including .config
1201 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1202 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1203 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1205 PHONY += $(mrproper-dirs) mrproper archmrproper
1207 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1209 mrproper: clean archmrproper $(mrproper-dirs)
1218 @find $(srctree) $(RCS_FIND_IGNORE) \
1219 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1220 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1221 -o -name '.*.rej' -o -size 0 \
1222 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1223 -type f -print | xargs rm -f
1226 # Packaging of the kernel to various formats
1227 # ---------------------------------------------------------------------------
1228 # rpm target kept for backward compatibility
1229 package-dir := $(srctree)/scripts/package
1231 %pkg: include/config/kernel.release FORCE
1232 $(Q)$(MAKE) $(build)=$(package-dir) $@
1233 rpm: include/config/kernel.release FORCE
1234 $(Q)$(MAKE) $(build)=$(package-dir) $@
1237 # Brief documentation of the typical targets used
1238 # ---------------------------------------------------------------------------
1240 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1241 boards := $(notdir $(boards))
1242 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1243 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1246 @echo 'Cleaning targets:'
1247 @echo ' clean - Remove most generated files but keep the config and'
1248 @echo ' enough build support to build external modules'
1249 @echo ' mrproper - Remove all generated files + config + various backup files'
1250 @echo ' distclean - mrproper + remove editor backup and patch files'
1252 @echo 'Configuration targets:'
1253 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1255 @echo 'Other generic targets:'
1256 @echo ' all - Build all targets marked with [*]'
1257 @echo '* vmlinux - Build the bare kernel'
1258 @echo '* modules - Build all modules'
1259 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1260 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1261 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1262 @echo ' dir/ - Build all files in dir and below'
1263 @echo ' dir/file.[oisS] - Build specified target only'
1264 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1265 @echo ' (requires a recent binutils and recent build (System.map))'
1266 @echo ' dir/file.ko - Build module including final link'
1267 @echo ' modules_prepare - Set up for building external modules'
1268 @echo ' tags/TAGS - Generate tags file for editors'
1269 @echo ' cscope - Generate cscope index'
1270 @echo ' kernelrelease - Output the release version string'
1271 @echo ' kernelversion - Output the version stored in Makefile'
1272 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1273 echo ' (default: $(INSTALL_HDR_PATH))'; \
1275 @echo 'Static analysers'
1276 @echo ' checkstack - Generate a list of stack hogs'
1277 @echo ' namespacecheck - Name space analysis on compiled kernel'
1278 @echo ' versioncheck - Sanity check on version.h usage'
1279 @echo ' includecheck - Check for duplicate included header files'
1280 @echo ' export_report - List the usages of all exported symbols'
1281 @echo ' headers_check - Sanity check on exported headers'
1282 @echo ' headerdep - Detect inclusion cycles in headers'; \
1284 @echo 'Kernel packaging:'
1285 @$(MAKE) $(build)=$(package-dir) help
1287 @echo 'Documentation targets:'
1288 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1290 @echo 'Architecture specific targets ($(SRCARCH)):'
1291 @$(if $(archhelp),$(archhelp),\
1292 echo ' No architecture specific help defined for $(SRCARCH)')
1295 $(foreach b, $(boards), \
1296 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1298 @$(if $(board-dirs), \
1299 $(foreach b, $(board-dirs), \
1300 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1301 printf " %-16s - Show all of the above\\n" help-boards; \
1304 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1305 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1306 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1307 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1308 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1310 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1311 @echo 'For further info see the ./README file'
1314 help-board-dirs := $(addprefix help-,$(board-dirs))
1316 help-boards: $(help-board-dirs)
1318 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1320 $(help-board-dirs): help-%:
1321 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1322 @$(if $(boards-per-dir), \
1323 $(foreach b, $(boards-per-dir), \
1324 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1328 # Documentation targets
1329 # ---------------------------------------------------------------------------
1330 %docs: scripts_basic FORCE
1331 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1333 else # KBUILD_EXTMOD
1336 # External module support.
1337 # When building external modules the kernel used as basis is considered
1338 # read-only, and no consistency checks are made and the make
1339 # system is not used on the basis kernel. If updates are required
1340 # in the basis kernel ordinary make commands (without M=...) must
1343 # The following are the only valid targets when building external
1345 # make M=dir clean Delete all automatically generated files
1346 # make M=dir modules Make all modules in specified dir
1347 # make M=dir Same as 'make M=dir modules'
1348 # make M=dir modules_install
1349 # Install the modules built in the module directory
1350 # Assumes install directory is already created
1352 # We are always building modules
1354 PHONY += crmodverdir
1358 PHONY += $(objtree)/Module.symvers
1359 $(objtree)/Module.symvers:
1360 @test -e $(objtree)/Module.symvers || ( \
1362 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1363 echo " is missing; modules will have no dependencies and modversions."; \
1366 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1367 PHONY += $(module-dirs) modules
1368 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1369 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1371 modules: $(module-dirs)
1372 @$(kecho) ' Building modules, stage 2.';
1373 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1375 PHONY += modules_install
1376 modules_install: _emodinst_ _emodinst_post
1378 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1381 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1382 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1384 PHONY += _emodinst_post
1385 _emodinst_post: _emodinst_
1388 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1390 PHONY += $(clean-dirs) clean
1392 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1394 clean: rm-dirs := $(MODVERDIR)
1395 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1396 $(KBUILD_EXTMOD)/modules.order \
1397 $(KBUILD_EXTMOD)/modules.builtin
1398 clean: $(clean-dirs)
1401 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1402 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1403 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1404 -o -name '*.gcno' \) -type f -print | xargs rm -f
1407 @echo ' Building external modules.'
1408 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1410 @echo ' modules - default target, build the module(s)'
1411 @echo ' modules_install - install the module'
1412 @echo ' clean - remove generated files in module directory only'
1416 PHONY += prepare scripts
1419 endif # KBUILD_EXTMOD
1421 # Generate tags for editors
1422 # ---------------------------------------------------------------------------
1423 quiet_cmd_tags = GEN $@
1424 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1426 tags TAGS cscope: FORCE
1429 # Scripts to check various things for consistency
1430 # ---------------------------------------------------------------------------
1433 find * $(RCS_FIND_IGNORE) \
1434 -name '*.[hcS]' -type f -print | sort \
1435 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1438 find * $(RCS_FIND_IGNORE) \
1439 -name '*.[hcS]' -type f -print | sort \
1440 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1443 $(PERL) $(srctree)/scripts/namespace.pl
1446 $(PERL) $(srctree)/scripts/export_report.pl
1448 endif #ifeq ($(config-targets),1)
1449 endif #ifeq ($(mixed-targets),1)
1451 PHONY += checkstack kernelrelease kernelversion
1453 # UML needs a little special treatment here. It wants to use the host
1454 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1455 # else wants $(ARCH), including people doing cross-builds, which means
1456 # that $(SUBARCH) doesn't work here.
1458 CHECKSTACK_ARCH := $(SUBARCH)
1460 CHECKSTACK_ARCH := $(ARCH)
1463 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1464 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1467 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1468 $(error kernelrelease not valid - run 'make prepare' to update it))
1470 @echo $(KERNELVERSION)
1473 # ---------------------------------------------------------------------------
1474 # Single targets are compatible with:
1475 # - build with mixed source and output
1476 # - build with separate output dir 'make O=...'
1477 # - external modules
1479 # target-dir => where to store outputfile
1480 # build-dir => directory in kernel source tree to use
1482 ifeq ($(KBUILD_EXTMOD),)
1483 build-dir = $(patsubst %/,%,$(dir $@))
1484 target-dir = $(dir $@)
1486 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1487 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1488 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1491 %.s: %.c prepare scripts FORCE
1492 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493 %.i: %.c prepare scripts FORCE
1494 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495 %.o: %.c prepare scripts FORCE
1496 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497 %.lst: %.c prepare scripts FORCE
1498 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499 %.s: %.S prepare scripts FORCE
1500 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501 %.o: %.S prepare scripts FORCE
1502 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1503 %.symtypes: %.c prepare scripts FORCE
1504 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1507 /: prepare scripts FORCE
1509 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1510 $(build)=$(build-dir)
1511 %/: prepare scripts FORCE
1513 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1514 $(build)=$(build-dir)
1515 %.ko: prepare scripts FORCE
1517 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1518 $(build)=$(build-dir) $(@:.ko=.o)
1519 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1521 # FIXME Should go into a make.lib or something
1522 # ===========================================================================
1524 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1525 cmd_rmdirs = rm -rf $(rm-dirs)
1527 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1528 cmd_rmfiles = rm -f $(rm-files)
1530 # Run depmod only if we have System.map and depmod is executable
1531 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1533 if [ -r System.map -a -x $(DEPMOD) ]; then \
1534 $(DEPMOD) -ae -F System.map \
1535 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1539 # Create temporary dir for module support files
1540 # clean it up only when building all modules
1541 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1542 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1544 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1545 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1546 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1548 quiet_cmd_as_o_S = AS $@
1549 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1551 # read all saved command lines
1553 targets := $(wildcard $(sort $(targets)))
1554 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1556 ifneq ($(cmd_files),)
1557 $(cmd_files): ; # Do not try to update included dependency files
1558 include $(cmd_files)
1561 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1563 # $(Q)$(MAKE) $(clean)=dir
1564 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1566 endif # skip-makefile
1571 # Declare the contents of the .PHONY variable as phony. We keep that
1572 # information in a variable so we can use it in if_changed and friends.