5 NAME = Flesh-Eating Bats with Fangs
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)
192 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
194 # Architecture as present in compile.h
195 UTS_MACHINE := $(ARCH)
198 # Additional ARCH settings for x86
202 ifeq ($(ARCH),x86_64)
206 # Additional ARCH settings for sparc
207 ifeq ($(ARCH),sparc64)
211 # Additional ARCH settings for sh
216 # Where to locate arch specific headers
217 hdr-arch := $(SRCARCH)
219 ifeq ($(ARCH),m68knommu)
223 KCONFIG_CONFIG ?= .config
225 # SHELL used by kbuild
226 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
227 else if [ -x /bin/bash ]; then echo /bin/bash; \
228 else echo sh; fi ; fi)
232 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
235 # Decide whether to build built-in, modular, or both.
236 # Normally, just do built-in.
241 # If we have only "make modules", don't compile built-in objects.
242 # When we're building modules with modversions, we need to consider
243 # the built-in objects during the descend as well, in order to
244 # make sure the checksums are up to date before we record them.
246 ifeq ($(MAKECMDGOALS),modules)
247 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
250 # If we have "make <whatever> modules", compile modules
251 # in addition to whatever we do anyway.
252 # Just "make" or "make all" shall build modules as well
254 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
258 ifeq ($(MAKECMDGOALS),)
262 export KBUILD_MODULES KBUILD_BUILTIN
263 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
266 # ---------------------------------------------------------------------------
268 # Normally, we echo the whole command before executing it. By making
269 # that echo $($(quiet)$(cmd)), we now have the possibility to set
270 # $(quiet) to choose other forms of output instead, e.g.
272 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
273 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
275 # If $(quiet) is empty, the whole command will be printed.
276 # If it is set to "quiet_", only the short version will be printed.
277 # If it is set to "silent_", nothing will be printed at all, since
278 # the variable $(silent_cmd_cc_o_c) doesn't exist.
280 # A simple variant is to prefix commands with $(Q) - that's useful
281 # for commands that shall be hidden in non-verbose mode.
285 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
286 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
288 ifeq ($(KBUILD_VERBOSE),1)
296 # If the user is running make -s (silent mode), suppress echoing of
299 ifneq ($(findstring s,$(MAKEFLAGS)),)
303 export quiet Q KBUILD_VERBOSE
306 # Look for make include files relative to root of kernel src
307 MAKEFLAGS += --include-dir=$(srctree)
309 # We need some generic definitions (do not try to remake the file).
310 $(srctree)/scripts/Kbuild.include: ;
311 include $(srctree)/scripts/Kbuild.include
313 # Make variables (CC, etc...)
315 AS = $(CROSS_COMPILE)as
316 LD = $(CROSS_COMPILE)ld
317 CC = $(CROSS_COMPILE)gcc
319 AR = $(CROSS_COMPILE)ar
320 NM = $(CROSS_COMPILE)nm
321 STRIP = $(CROSS_COMPILE)strip
322 OBJCOPY = $(CROSS_COMPILE)objcopy
323 OBJDUMP = $(CROSS_COMPILE)objdump
325 GENKSYMS = scripts/genksyms/genksyms
326 INSTALLKERNEL := installkernel
327 DEPMOD = /sbin/depmod
328 KALLSYMS = scripts/kallsyms
332 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
333 -Wbitwise -Wno-return-void $(CF)
339 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
342 # Use LINUXINCLUDE when you must reference the include/ directory.
343 # Needed to be compatible with the O= option
344 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
345 $(if $(KBUILD_SRC), -I$(srctree)/include) \
346 -include include/generated/autoconf.h
348 KBUILD_CPPFLAGS := -D__KERNEL__
350 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
351 -fno-strict-aliasing -fno-common \
352 -Werror-implicit-function-declaration \
353 -Wno-format-security \
354 -fno-delete-null-pointer-checks
355 KBUILD_AFLAGS_KERNEL :=
356 KBUILD_CFLAGS_KERNEL :=
357 KBUILD_AFLAGS := -D__ASSEMBLY__
358 KBUILD_AFLAGS_MODULE := -DMODULE
359 KBUILD_CFLAGS_MODULE := -DMODULE
360 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
362 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
363 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
364 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
366 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
367 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
368 export CPP AR NM STRIP OBJCOPY OBJDUMP
369 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
370 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
372 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
373 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
374 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
375 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
376 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
378 # When compiling out-of-tree modules, put MODVERDIR in the module
379 # tree rather than in the kernel tree. The kernel tree might
381 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
383 # Files to ignore in find ... statements
385 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
386 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
388 # ===========================================================================
389 # Rules shared between *config targets and build targets
391 # Basic helpers built in scripts/
392 PHONY += scripts_basic
394 $(Q)$(MAKE) $(build)=scripts/basic
395 $(Q)rm -f .tmp_quiet_recordmcount
397 # To avoid any implicit rule to kick in, define an empty command.
398 scripts/basic/%: scripts_basic ;
400 PHONY += outputmakefile
401 # outputmakefile generates a Makefile in the output directory, if using a
402 # separate output directory. This allows convenient use of make in the
405 ifneq ($(KBUILD_SRC),)
406 $(Q)ln -fsn $(srctree) source
407 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
408 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
411 # To make sure we do not include .config for any of the *config targets
412 # catch them early, and hand them over to scripts/kconfig/Makefile
413 # It is allowed to specify more targets when calling make, including
414 # mixing *config targets and build targets.
415 # For example 'make oldconfig all'.
416 # Detect when mixed targets is specified, and make a second invocation
417 # of make so .config is not included in this case either (for *config).
419 no-dot-config-targets := clean mrproper distclean \
420 cscope TAGS tags help %docs check% coccicheck \
421 include/linux/version.h headers_% \
422 kernelversion %src-pkg
428 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
429 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
434 ifeq ($(KBUILD_EXTMOD),)
435 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
437 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
443 ifeq ($(mixed-targets),1)
444 # ===========================================================================
445 # We're called with mixed targets (*config and build targets).
446 # Handle them one by one.
449 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
452 ifeq ($(config-targets),1)
453 # ===========================================================================
454 # *config targets only - make sure prerequisites are updated, and descend
455 # in scripts/kconfig to make the *config target
457 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
458 # KBUILD_DEFCONFIG may point out an alternative default configuration
459 # used for 'make defconfig'
460 include $(srctree)/arch/$(SRCARCH)/Makefile
461 export KBUILD_DEFCONFIG KBUILD_KCONFIG
463 config: scripts_basic outputmakefile FORCE
464 $(Q)mkdir -p include/linux include/config
465 $(Q)$(MAKE) $(build)=scripts/kconfig $@
467 %config: scripts_basic outputmakefile FORCE
468 $(Q)mkdir -p include/linux include/config
469 $(Q)$(MAKE) $(build)=scripts/kconfig $@
472 # ===========================================================================
473 # Build targets only - this includes vmlinux, arch specific targets, clean
474 # targets and others. In general all targets except *config targets.
476 ifeq ($(KBUILD_EXTMOD),)
477 # Additional helpers built in scripts/
478 # Carefully list dependencies so we do not try to build scripts twice
481 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
482 $(Q)$(MAKE) $(build)=$(@)
484 # Objects we will link into vmlinux / subdirs we need to visit
486 drivers-y := drivers/ sound/ firmware/
490 endif # KBUILD_EXTMOD
492 ifeq ($(dot-config),1)
494 -include include/config/auto.conf
496 ifeq ($(KBUILD_EXTMOD),)
497 # Read in dependencies to all Kconfig* files, make sure to run
498 # oldconfig if changes are detected.
499 -include include/config/auto.conf.cmd
501 # To avoid any implicit rule to kick in, define an empty command
502 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
504 # If .config is newer than include/config/auto.conf, someone tinkered
505 # with it and forgot to run make oldconfig.
506 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
507 # we execute the config step to be sure to catch updated Kconfig files
508 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
509 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
511 # external modules needs include/generated/autoconf.h and include/config/auto.conf
512 # but do not care if they are up-to-date. Use auto.conf to trigger the test
513 PHONY += include/config/auto.conf
515 include/config/auto.conf:
516 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
518 echo " ERROR: Kernel configuration is invalid."; \
519 echo " include/generated/autoconf.h or $@ are missing.";\
520 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
524 endif # KBUILD_EXTMOD
527 # Dummy target needed, because used as prerequisite
528 include/config/auto.conf: ;
529 endif # $(dot-config)
531 # The all: target is the default when no target is given on the
533 # This allow a user to issue only 'make' to build a kernel including modules
534 # Defaults to vmlinux, but the arch makefile usually adds further targets
537 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
543 include $(srctree)/arch/$(SRCARCH)/Makefile
545 ifneq ($(CONFIG_FRAME_WARN),0)
546 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
549 # Force gcc to behave correct even for buggy distributions
550 ifndef CONFIG_CC_STACKPROTECTOR
551 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
554 ifdef CONFIG_FRAME_POINTER
555 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
557 KBUILD_CFLAGS += -fomit-frame-pointer
560 ifdef CONFIG_DEBUG_INFO
562 KBUILD_AFLAGS += -gdwarf-2
565 ifdef CONFIG_DEBUG_INFO_REDUCED
566 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
569 ifdef CONFIG_FUNCTION_TRACER
573 # We trigger additional mismatches with less inlining
574 ifdef CONFIG_DEBUG_SECTION_MISMATCH
575 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
578 # arch Makefile may override CC so keep this after arch Makefile is included
579 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
580 CHECKFLAGS += $(NOSTDINC_FLAGS)
582 # warn about C99 declaration after statement
583 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
585 # disable pointer signed / unsigned warnings in gcc 4.0
586 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
588 # disable invalid "can't wrap" optimizations for signed / pointers
589 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
591 # conserve stack if available
592 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
594 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
595 # But warn user when we do so
597 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
599 ifneq ($(KCPPFLAGS),)
600 $(call warn-assign,CPPFLAGS)
601 KBUILD_CPPFLAGS += $(KCPPFLAGS)
604 $(call warn-assign,AFLAGS)
605 KBUILD_AFLAGS += $(KAFLAGS)
608 $(call warn-assign,CFLAGS)
609 KBUILD_CFLAGS += $(KCFLAGS)
612 # Use --build-id when available.
613 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
614 $(call cc-ldoption, -Wl$(comma)--build-id,))
615 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
616 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
618 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
619 LDFLAGS_vmlinux += $(call ld-option, -X,)
622 # Default kernel image to build when no specific target is given.
623 # KBUILD_IMAGE may be overruled on the command line or
624 # set in the environment
625 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
627 export KBUILD_IMAGE ?= vmlinux
630 # INSTALL_PATH specifies where to place the updated kernel and system map
631 # images. Default is /boot, but you can set it to other values
632 export INSTALL_PATH ?= /boot
635 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
636 # relocations required by build roots. This is not defined in the
637 # makefile but the argument can be passed to make if needed.
640 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
644 # INSTALL_MOD_STRIP, if defined, will cause modules to be
645 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
646 # the default option --strip-debug will be used. Otherwise,
647 # INSTALL_MOD_STRIP will used as the options to the strip command.
649 ifdef INSTALL_MOD_STRIP
650 ifeq ($(INSTALL_MOD_STRIP),1)
651 mod_strip_cmd = $(STRIP) --strip-debug
653 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
654 endif # INSTALL_MOD_STRIP=1
657 endif # INSTALL_MOD_STRIP
661 ifeq ($(KBUILD_EXTMOD),)
662 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
664 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
665 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
666 $(net-y) $(net-m) $(libs-y) $(libs-m)))
668 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
670 $(core-n) $(core-) $(drivers-n) $(drivers-) \
671 $(net-n) $(net-) $(libs-n) $(libs-))))
673 init-y := $(patsubst %/, %/built-in.o, $(init-y))
674 core-y := $(patsubst %/, %/built-in.o, $(core-y))
675 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
676 net-y := $(patsubst %/, %/built-in.o, $(net-y))
677 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
678 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
679 libs-y := $(libs-y1) $(libs-y2)
682 # ---------------------------------------------------------------------------
683 # vmlinux is built from the objects selected by $(vmlinux-init) and
684 # $(vmlinux-main). Most are built-in.o files from top-level directories
685 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
686 # Ordering when linking is important, and $(vmlinux-init) must be first.
691 # +-< $(vmlinux-init)
692 # | +--< init/version.o + more
694 # +--< $(vmlinux-main)
695 # | +--< driver/built-in.o mm/built-in.o + more
697 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
699 # vmlinux version (uname -v) cannot be updated during normal
700 # descending-into-subdirs phase since we do not yet know if we need to
702 # Therefore this step is delayed until just before final link of vmlinux -
703 # except in the kallsyms case where it is done just before adding the
704 # symbols to the kernel.
706 # System.map is generated to document addresses of all kernel symbols
708 vmlinux-init := $(head-y) $(init-y)
709 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
710 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
711 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
712 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
714 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
715 # May be overridden by arch/$(ARCH)/Makefile
716 quiet_cmd_vmlinux__ ?= LD $@
717 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
718 -T $(vmlinux-lds) $(vmlinux-init) \
719 --start-group $(vmlinux-main) --end-group \
720 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
722 # Generate new vmlinux version
723 quiet_cmd_vmlinux_version = GEN .version
724 cmd_vmlinux_version = set -e; \
725 if [ ! -r .version ]; then \
729 mv .version .old_version; \
730 expr 0$$(cat .old_version) + 1 >.version; \
732 $(MAKE) $(build)=init
734 # Generate System.map
735 quiet_cmd_sysmap = SYSMAP
736 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
739 # If CONFIG_KALLSYMS is set .version is already updated
740 # Generate System.map and verify that the content is consistent
741 # Use + in front of the vmlinux_version rule to silent warning with make -j2
742 # First command is ':' to allow us to use + in front of the rule
743 define rule_vmlinux__
745 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
747 $(call cmd,vmlinux__)
748 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
750 $(Q)$(if $($(quiet)cmd_sysmap), \
751 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
752 $(cmd_sysmap) $@ System.map; \
753 if [ $$? -ne 0 ]; then \
761 ifdef CONFIG_KALLSYMS
762 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
763 # It's a three stage process:
764 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
766 # Running kallsyms on that gives us .tmp_kallsyms1.o with
767 # the right size - vmlinux version (uname -v) is updated during this step
768 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
769 # but due to the added section, some addresses have shifted.
770 # From here, we generate a correct .tmp_kallsyms2.o
771 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
772 # o Verify that the System.map from vmlinux matches the map from
773 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
774 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
775 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
776 # temporary bypass to allow the kernel to be built while the
777 # maintainers work out what went wrong with kallsyms.
779 ifdef CONFIG_KALLSYMS_EXTRA_PASS
785 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
787 define verify_kallsyms
788 $(Q)$(if $($(quiet)cmd_sysmap), \
789 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
790 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
791 $(Q)cmp -s System.map .tmp_System.map || \
792 (echo Inconsistent kallsyms data; \
793 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
794 rm .tmp_kallsyms* ; /bin/false )
797 # Update vmlinux version before link
798 # Use + in front of this rule to silent warning about make -j1
799 # First command is ':' to allow us to use + in front of this rule
800 cmd_ksym_ld = $(cmd_vmlinux__)
803 +$(call cmd,vmlinux_version)
804 $(call cmd,vmlinux__)
805 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
808 # Generate .S file with all kernel symbols
809 quiet_cmd_kallsyms = KSYM $@
810 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
811 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
813 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
814 $(call if_changed_dep,as_o_S)
816 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
819 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
820 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
821 $(call if_changed_rule,ksym_ld)
823 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
824 $(call if_changed,vmlinux__)
826 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
827 $(call if_changed,vmlinux__)
829 # Needs to visit scripts/ before $(KALLSYMS) can be used.
830 $(KALLSYMS): scripts ;
832 # Generate some data for debugging strange kallsyms problems
833 debug_kallsyms: .tmp_map$(last_kallsyms)
835 .tmp_map%: .tmp_vmlinux% FORCE
836 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
842 endif # ifdef CONFIG_KALLSYMS
844 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
845 # relevant sections renamed as per the linker script.
846 quiet_cmd_vmlinux-modpost = LD $@
847 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
848 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
849 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
850 define rule_vmlinux-modpost
852 +$(call cmd,vmlinux-modpost)
853 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
854 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
857 # vmlinux image - including updated kernel symbols
858 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
859 ifdef CONFIG_HEADERS_CHECK
860 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
863 $(Q)$(MAKE) $(build)=samples
865 ifdef CONFIG_BUILD_DOCSRC
866 $(Q)$(MAKE) $(build)=Documentation
868 $(call vmlinux-modpost)
869 $(call if_changed_rule,vmlinux__)
870 $(Q)rm -f .old_version
872 # build vmlinux.o first to catch section mismatch errors early
873 ifdef CONFIG_KALLSYMS
874 .tmp_vmlinux1: vmlinux.o
877 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
878 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
879 $(call if_changed_rule,vmlinux-modpost)
881 # The actual objects are generated when descending,
882 # make sure no implicit rule kicks in
883 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
885 # Handle descending into subdirectories listed in $(vmlinux-dirs)
886 # Preset locale variables to speed up the build process. Limit locale
887 # tweaks to this spot to avoid wrong language settings when running
888 # make menuconfig etc.
889 # Error messages still appears in the original language
891 PHONY += $(vmlinux-dirs)
892 $(vmlinux-dirs): prepare scripts
893 $(Q)$(MAKE) $(build)=$@
895 # Store (new) KERNELRELASE string in include/config/kernel.release
896 include/config/kernel.release: include/config/auto.conf FORCE
898 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
901 # Things we need to do before we recursively start building the kernel
902 # or the modules are listed in "prepare".
903 # A multi level approach is used. prepareN is processed before prepareN-1.
904 # archprepare is used in arch Makefiles and when processed asm symlink,
905 # version.h and scripts_basic is processed / created.
907 # Listed in dependency order
908 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
910 # prepare3 is used to check if we are building in a separate output directory,
912 # 1) Check that make has not been executed in the kernel src $(srctree)
913 prepare3: include/config/kernel.release
914 ifneq ($(KBUILD_SRC),)
915 @$(kecho) ' Using $(srctree) as source for kernel'
916 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
917 echo " $(srctree) is not clean, please run 'make mrproper'";\
918 echo " in the '$(srctree)' directory.";\
923 # prepare2 creates a makefile if using a separate output directory
924 prepare2: prepare3 outputmakefile
926 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
927 include/config/auto.conf
930 archprepare: prepare1 scripts_basic
932 prepare0: archprepare FORCE
933 $(Q)$(MAKE) $(build)=.
934 $(Q)$(MAKE) $(build)=. missing-syscalls
936 # All the preparing..
939 # Generate some files
940 # ---------------------------------------------------------------------------
942 # KERNELRELEASE can change from a few different places, meaning version.h
943 # needs to be updated, so this check is forced on all builds
946 define filechk_utsrelease.h
947 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
948 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
951 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
954 define filechk_version.h
955 (echo \#define LINUX_VERSION_CODE $(shell \
956 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
957 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
960 include/linux/version.h: $(srctree)/Makefile FORCE
961 $(call filechk,version.h)
963 include/generated/utsrelease.h: include/config/kernel.release FORCE
964 $(call filechk,utsrelease.h)
968 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
970 # ---------------------------------------------------------------------------
974 @echo '*** Warning: make $@ is unnecessary now.'
976 # ---------------------------------------------------------------------------
978 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
979 export INSTALL_FW_PATH
981 PHONY += firmware_install
982 firmware_install: FORCE
983 @mkdir -p $(objtree)/firmware
984 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
986 # ---------------------------------------------------------------------------
989 #Default location for installed headers
990 export INSTALL_HDR_PATH = $(objtree)/usr
992 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
994 # If we do an all arch process set dst to asm-$(hdr-arch)
995 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
998 __headers: include/linux/version.h scripts_basic FORCE
999 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1001 PHONY += headers_install_all
1002 headers_install_all:
1003 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1005 PHONY += headers_install
1006 headers_install: __headers
1007 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1008 $(error Headers not exportable for the $(SRCARCH) architecture))
1009 $(Q)$(MAKE) $(hdr-inst)=include
1010 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1012 PHONY += headers_check_all
1013 headers_check_all: headers_install_all
1014 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1016 PHONY += headers_check
1017 headers_check: headers_install
1018 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1019 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1021 # ---------------------------------------------------------------------------
1024 ifdef CONFIG_MODULES
1026 # By default, build modules as well
1032 # A module can be listed more than once in obj-m resulting in
1033 # duplicate lines in modules.order files. Those are removed
1034 # using awk while concatenating to the final file.
1037 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1038 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1039 @$(kecho) ' Building modules, stage 2.';
1040 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1041 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1043 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1044 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1046 %/modules.builtin: include/config/auto.conf
1047 $(Q)$(MAKE) $(modbuiltin)=$*
1050 # Target to prepare building external modules
1051 PHONY += modules_prepare
1052 modules_prepare: prepare scripts
1054 # Target to install modules
1055 PHONY += modules_install
1056 modules_install: _modinst_ _modinst_post
1060 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1061 echo "Warning: you may need to install module-init-tools"; \
1062 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1065 @rm -rf $(MODLIB)/kernel
1066 @rm -f $(MODLIB)/source
1067 @mkdir -p $(MODLIB)/kernel
1068 @ln -s $(srctree) $(MODLIB)/source
1069 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1070 rm -f $(MODLIB)/build ; \
1071 ln -s $(objtree) $(MODLIB)/build ; \
1073 @cp -f $(objtree)/modules.order $(MODLIB)/
1074 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1075 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1077 # This depmod is only for convenience to give the initial
1078 # boot a modules.dep even before / is mounted read-write. However the
1079 # boot script depmod is the master version.
1080 PHONY += _modinst_post
1081 _modinst_post: _modinst_
1082 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1085 else # CONFIG_MODULES
1087 # Modules not configured
1088 # ---------------------------------------------------------------------------
1090 modules modules_install: FORCE
1092 @echo "The present kernel configuration has modules disabled."
1093 @echo "Type 'make config' and enable loadable module support."
1094 @echo "Then build a kernel with module support enabled."
1098 endif # CONFIG_MODULES
1101 # Cleaning is done on three levels.
1102 # make clean Delete most generated files
1103 # Leave enough to build external modules
1104 # make mrproper Delete the current configuration, and all generated files
1105 # make distclean Remove editor backup files, patch leftover files and the like
1107 # Directories & files removed with 'make clean'
1108 CLEAN_DIRS += $(MODVERDIR)
1109 CLEAN_FILES += vmlinux System.map \
1110 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1112 # Directories & files removed with 'make mrproper'
1113 MRPROPER_DIRS += include/config usr/include include/generated
1114 MRPROPER_FILES += .config .config.old .version .old_version \
1115 include/linux/version.h \
1116 Module.symvers tags TAGS cscope*
1118 # clean - Delete most, but leave enough to build external modules
1120 clean: rm-dirs := $(CLEAN_DIRS)
1121 clean: rm-files := $(CLEAN_FILES)
1122 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1124 PHONY += $(clean-dirs) clean archclean
1126 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1128 clean: archclean $(clean-dirs)
1131 @find . $(RCS_FIND_IGNORE) \
1132 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1133 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1134 -o -name '*.symtypes' -o -name 'modules.order' \
1135 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1136 -o -name '*.gcno' \) -type f -print | xargs rm -f
1138 # mrproper - Delete all generated files, including .config
1140 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1141 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1142 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1144 PHONY += $(mrproper-dirs) mrproper archmrproper
1146 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1148 mrproper: clean archmrproper $(mrproper-dirs)
1157 @find $(srctree) $(RCS_FIND_IGNORE) \
1158 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1159 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1160 -o -name '.*.rej' -o -size 0 \
1161 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1162 -type f -print | xargs rm -f
1165 # Packaging of the kernel to various formats
1166 # ---------------------------------------------------------------------------
1167 # rpm target kept for backward compatibility
1168 package-dir := $(srctree)/scripts/package
1171 $(Q)$(MAKE) $(build)=$(package-dir) $@
1172 %pkg: include/config/kernel.release FORCE
1173 $(Q)$(MAKE) $(build)=$(package-dir) $@
1174 rpm: include/config/kernel.release FORCE
1175 $(Q)$(MAKE) $(build)=$(package-dir) $@
1178 # Brief documentation of the typical targets used
1179 # ---------------------------------------------------------------------------
1181 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1182 boards := $(notdir $(boards))
1183 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1184 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1187 @echo 'Cleaning targets:'
1188 @echo ' clean - Remove most generated files but keep the config and'
1189 @echo ' enough build support to build external modules'
1190 @echo ' mrproper - Remove all generated files + config + various backup files'
1191 @echo ' distclean - mrproper + remove editor backup and patch files'
1193 @echo 'Configuration targets:'
1194 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1196 @echo 'Other generic targets:'
1197 @echo ' all - Build all targets marked with [*]'
1198 @echo '* vmlinux - Build the bare kernel'
1199 @echo '* modules - Build all modules'
1200 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1201 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1202 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1203 @echo ' dir/ - Build all files in dir and below'
1204 @echo ' dir/file.[oisS] - Build specified target only'
1205 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1206 @echo ' (requires a recent binutils and recent build (System.map))'
1207 @echo ' dir/file.ko - Build module including final link'
1208 @echo ' modules_prepare - Set up for building external modules'
1209 @echo ' tags/TAGS - Generate tags file for editors'
1210 @echo ' cscope - Generate cscope index'
1211 @echo ' kernelrelease - Output the release version string'
1212 @echo ' kernelversion - Output the version stored in Makefile'
1213 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1214 echo ' (default: $(INSTALL_HDR_PATH))'; \
1216 @echo 'Static analysers'
1217 @echo ' checkstack - Generate a list of stack hogs'
1218 @echo ' namespacecheck - Name space analysis on compiled kernel'
1219 @echo ' versioncheck - Sanity check on version.h usage'
1220 @echo ' includecheck - Check for duplicate included header files'
1221 @echo ' export_report - List the usages of all exported symbols'
1222 @echo ' headers_check - Sanity check on exported headers'
1223 @echo ' headerdep - Detect inclusion cycles in headers'
1224 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1226 @echo 'Kernel packaging:'
1227 @$(MAKE) $(build)=$(package-dir) help
1229 @echo 'Documentation targets:'
1230 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1232 @echo 'Architecture specific targets ($(SRCARCH)):'
1233 @$(if $(archhelp),$(archhelp),\
1234 echo ' No architecture specific help defined for $(SRCARCH)')
1237 $(foreach b, $(boards), \
1238 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1240 @$(if $(board-dirs), \
1241 $(foreach b, $(board-dirs), \
1242 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1243 printf " %-16s - Show all of the above\\n" help-boards; \
1246 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1247 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1248 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1249 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1250 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1252 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1253 @echo 'For further info see the ./README file'
1256 help-board-dirs := $(addprefix help-,$(board-dirs))
1258 help-boards: $(help-board-dirs)
1260 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1262 $(help-board-dirs): help-%:
1263 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1264 @$(if $(boards-per-dir), \
1265 $(foreach b, $(boards-per-dir), \
1266 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1270 # Documentation targets
1271 # ---------------------------------------------------------------------------
1272 %docs: scripts_basic FORCE
1273 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1275 else # KBUILD_EXTMOD
1278 # External module support.
1279 # When building external modules the kernel used as basis is considered
1280 # read-only, and no consistency checks are made and the make
1281 # system is not used on the basis kernel. If updates are required
1282 # in the basis kernel ordinary make commands (without M=...) must
1285 # The following are the only valid targets when building external
1287 # make M=dir clean Delete all automatically generated files
1288 # make M=dir modules Make all modules in specified dir
1289 # make M=dir Same as 'make M=dir modules'
1290 # make M=dir modules_install
1291 # Install the modules built in the module directory
1292 # Assumes install directory is already created
1294 # We are always building modules
1296 PHONY += crmodverdir
1300 PHONY += $(objtree)/Module.symvers
1301 $(objtree)/Module.symvers:
1302 @test -e $(objtree)/Module.symvers || ( \
1304 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1305 echo " is missing; modules will have no dependencies and modversions."; \
1308 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1309 PHONY += $(module-dirs) modules
1310 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1311 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1313 modules: $(module-dirs)
1314 @$(kecho) ' Building modules, stage 2.';
1315 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1317 PHONY += modules_install
1318 modules_install: _emodinst_ _emodinst_post
1320 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1323 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1324 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1326 PHONY += _emodinst_post
1327 _emodinst_post: _emodinst_
1330 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1332 PHONY += $(clean-dirs) clean
1334 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1336 clean: rm-dirs := $(MODVERDIR)
1337 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1338 $(KBUILD_EXTMOD)/modules.order \
1339 $(KBUILD_EXTMOD)/modules.builtin
1340 clean: $(clean-dirs)
1343 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1344 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1345 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1346 -o -name '*.gcno' \) -type f -print | xargs rm -f
1349 @echo ' Building external modules.'
1350 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1352 @echo ' modules - default target, build the module(s)'
1353 @echo ' modules_install - install the module'
1354 @echo ' clean - remove generated files in module directory only'
1358 PHONY += prepare scripts
1361 endif # KBUILD_EXTMOD
1363 # Generate tags for editors
1364 # ---------------------------------------------------------------------------
1365 quiet_cmd_tags = GEN $@
1366 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1368 tags TAGS cscope: FORCE
1371 # Scripts to check various things for consistency
1372 # ---------------------------------------------------------------------------
1375 find * $(RCS_FIND_IGNORE) \
1376 -name '*.[hcS]' -type f -print | sort \
1377 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1380 find * $(RCS_FIND_IGNORE) \
1381 -name '*.[hcS]' -type f -print | sort \
1382 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1385 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1388 $(PERL) $(srctree)/scripts/namespace.pl
1391 $(PERL) $(srctree)/scripts/export_report.pl
1393 endif #ifeq ($(config-targets),1)
1394 endif #ifeq ($(mixed-targets),1)
1396 PHONY += checkstack kernelrelease kernelversion
1398 # UML needs a little special treatment here. It wants to use the host
1399 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1400 # else wants $(ARCH), including people doing cross-builds, which means
1401 # that $(SUBARCH) doesn't work here.
1403 CHECKSTACK_ARCH := $(SUBARCH)
1405 CHECKSTACK_ARCH := $(ARCH)
1408 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1409 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1412 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1415 @echo $(KERNELVERSION)
1418 # ---------------------------------------------------------------------------
1419 # Single targets are compatible with:
1420 # - build with mixed source and output
1421 # - build with separate output dir 'make O=...'
1422 # - external modules
1424 # target-dir => where to store outputfile
1425 # build-dir => directory in kernel source tree to use
1427 ifeq ($(KBUILD_EXTMOD),)
1428 build-dir = $(patsubst %/,%,$(dir $@))
1429 target-dir = $(dir $@)
1431 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1432 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1433 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1436 %.s: %.c prepare scripts FORCE
1437 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1438 %.i: %.c prepare scripts FORCE
1439 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1440 %.o: %.c prepare scripts FORCE
1441 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1442 %.lst: %.c prepare scripts FORCE
1443 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1444 %.s: %.S prepare scripts FORCE
1445 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1446 %.o: %.S prepare scripts FORCE
1447 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1448 %.symtypes: %.c prepare scripts FORCE
1449 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1452 /: prepare scripts FORCE
1454 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1455 $(build)=$(build-dir)
1456 %/: prepare scripts FORCE
1458 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1459 $(build)=$(build-dir)
1460 %.ko: prepare scripts FORCE
1462 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1463 $(build)=$(build-dir) $(@:.ko=.o)
1464 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1466 # FIXME Should go into a make.lib or something
1467 # ===========================================================================
1469 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1470 cmd_rmdirs = rm -rf $(rm-dirs)
1472 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1473 cmd_rmfiles = rm -f $(rm-files)
1475 # Run depmod only if we have System.map and depmod is executable
1476 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1478 if [ -r System.map -a -x $(DEPMOD) ]; then \
1479 $(DEPMOD) -ae -F System.map \
1480 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1484 # Create temporary dir for module support files
1485 # clean it up only when building all modules
1486 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1487 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1489 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1490 $(KBUILD_AFLAGS_KERNEL) \
1491 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1492 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1494 quiet_cmd_as_o_S = AS $@
1495 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1497 # read all saved command lines
1499 targets := $(wildcard $(sort $(targets)))
1500 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1502 ifneq ($(cmd_files),)
1503 $(cmd_files): ; # Do not try to update included dependency files
1504 include $(cmd_files)
1507 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1509 # $(Q)$(MAKE) $(clean)=dir
1510 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1512 endif # skip-makefile
1517 # Declare the contents of the .PHONY variable as phony. We keep that
1518 # information in a variable so we can use it in if_changed and friends.