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 $(CF)
340 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
343 # Use LINUXINCLUDE when you must reference the include/ directory.
344 # Needed to be compatible with the O= option
345 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
346 $(if $(KBUILD_SRC), -I$(srctree)/include) \
347 -include include/generated/autoconf.h
349 KBUILD_CPPFLAGS := -D__KERNEL__
351 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
352 -fno-strict-aliasing -fno-common \
353 -Werror-implicit-function-declaration \
354 -Wno-format-security \
355 -fno-delete-null-pointer-checks
356 KBUILD_AFLAGS_KERNEL :=
357 KBUILD_CFLAGS_KERNEL :=
358 KBUILD_AFLAGS := -D__ASSEMBLY__
359 KBUILD_AFLAGS_MODULE := -DMODULE
360 KBUILD_CFLAGS_MODULE := -DMODULE
361 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
363 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
364 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
365 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
367 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
368 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
369 export CPP AR NM STRIP OBJCOPY OBJDUMP
370 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
371 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
373 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
374 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
375 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
376 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
377 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
379 # When compiling out-of-tree modules, put MODVERDIR in the module
380 # tree rather than in the kernel tree. The kernel tree might
382 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
384 # Files to ignore in find ... statements
386 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
387 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
389 # ===========================================================================
390 # Rules shared between *config targets and build targets
392 # Basic helpers built in scripts/
393 PHONY += scripts_basic
395 $(Q)$(MAKE) $(build)=scripts/basic
396 $(Q)rm -f .tmp_quiet_recordmcount
398 # To avoid any implicit rule to kick in, define an empty command.
399 scripts/basic/%: scripts_basic ;
401 PHONY += outputmakefile
402 # outputmakefile generates a Makefile in the output directory, if using a
403 # separate output directory. This allows convenient use of make in the
406 ifneq ($(KBUILD_SRC),)
407 $(Q)ln -fsn $(srctree) source
408 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
409 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
412 # To make sure we do not include .config for any of the *config targets
413 # catch them early, and hand them over to scripts/kconfig/Makefile
414 # It is allowed to specify more targets when calling make, including
415 # mixing *config targets and build targets.
416 # For example 'make oldconfig all'.
417 # Detect when mixed targets is specified, and make a second invocation
418 # of make so .config is not included in this case either (for *config).
420 no-dot-config-targets := clean mrproper distclean \
421 cscope TAGS tags help %docs check% coccicheck \
422 include/linux/version.h headers_% \
423 kernelversion %src-pkg
429 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
430 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
435 ifeq ($(KBUILD_EXTMOD),)
436 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
438 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
444 ifeq ($(mixed-targets),1)
445 # ===========================================================================
446 # We're called with mixed targets (*config and build targets).
447 # Handle them one by one.
450 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
453 ifeq ($(config-targets),1)
454 # ===========================================================================
455 # *config targets only - make sure prerequisites are updated, and descend
456 # in scripts/kconfig to make the *config target
458 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
459 # KBUILD_DEFCONFIG may point out an alternative default configuration
460 # used for 'make defconfig'
461 include $(srctree)/arch/$(SRCARCH)/Makefile
462 export KBUILD_DEFCONFIG KBUILD_KCONFIG
464 config: scripts_basic outputmakefile FORCE
465 $(Q)mkdir -p include/linux include/config
466 $(Q)$(MAKE) $(build)=scripts/kconfig $@
468 %config: scripts_basic outputmakefile FORCE
469 $(Q)mkdir -p include/linux include/config
470 $(Q)$(MAKE) $(build)=scripts/kconfig $@
473 # ===========================================================================
474 # Build targets only - this includes vmlinux, arch specific targets, clean
475 # targets and others. In general all targets except *config targets.
477 ifeq ($(KBUILD_EXTMOD),)
478 # Additional helpers built in scripts/
479 # Carefully list dependencies so we do not try to build scripts twice
482 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
483 $(Q)$(MAKE) $(build)=$(@)
485 # Objects we will link into vmlinux / subdirs we need to visit
487 drivers-y := drivers/ sound/ firmware/
491 endif # KBUILD_EXTMOD
493 ifeq ($(dot-config),1)
495 -include include/config/auto.conf
497 ifeq ($(KBUILD_EXTMOD),)
498 # Read in dependencies to all Kconfig* files, make sure to run
499 # oldconfig if changes are detected.
500 -include include/config/auto.conf.cmd
502 # To avoid any implicit rule to kick in, define an empty command
503 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
505 # If .config is newer than include/config/auto.conf, someone tinkered
506 # with it and forgot to run make oldconfig.
507 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
508 # we execute the config step to be sure to catch updated Kconfig files
509 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
510 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
512 # external modules needs include/generated/autoconf.h and include/config/auto.conf
513 # but do not care if they are up-to-date. Use auto.conf to trigger the test
514 PHONY += include/config/auto.conf
516 include/config/auto.conf:
517 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
519 echo " ERROR: Kernel configuration is invalid."; \
520 echo " include/generated/autoconf.h or $@ are missing.";\
521 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
525 endif # KBUILD_EXTMOD
528 # Dummy target needed, because used as prerequisite
529 include/config/auto.conf: ;
530 endif # $(dot-config)
532 # The all: target is the default when no target is given on the
534 # This allow a user to issue only 'make' to build a kernel including modules
535 # Defaults to vmlinux, but the arch makefile usually adds further targets
538 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
544 include $(srctree)/arch/$(SRCARCH)/Makefile
546 ifneq ($(CONFIG_FRAME_WARN),0)
547 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
550 # Force gcc to behave correct even for buggy distributions
551 ifndef CONFIG_CC_STACKPROTECTOR
552 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
555 ifdef CONFIG_FRAME_POINTER
556 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
558 KBUILD_CFLAGS += -fomit-frame-pointer
561 ifdef CONFIG_DEBUG_INFO
563 KBUILD_AFLAGS += -gdwarf-2
566 ifdef CONFIG_DEBUG_INFO_REDUCED
567 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
570 ifdef CONFIG_FUNCTION_TRACER
574 # We trigger additional mismatches with less inlining
575 ifdef CONFIG_DEBUG_SECTION_MISMATCH
576 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
579 # arch Makefile may override CC so keep this after arch Makefile is included
580 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
581 CHECKFLAGS += $(NOSTDINC_FLAGS)
583 # warn about C99 declaration after statement
584 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
586 # disable pointer signed / unsigned warnings in gcc 4.0
587 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
589 # disable invalid "can't wrap" optimizations for signed / pointers
590 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
592 # conserve stack if available
593 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
595 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
596 # But warn user when we do so
598 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
600 ifneq ($(KCPPFLAGS),)
601 $(call warn-assign,CPPFLAGS)
602 KBUILD_CPPFLAGS += $(KCPPFLAGS)
605 $(call warn-assign,AFLAGS)
606 KBUILD_AFLAGS += $(KAFLAGS)
609 $(call warn-assign,CFLAGS)
610 KBUILD_CFLAGS += $(KCFLAGS)
613 # Use --build-id when available.
614 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
615 $(call cc-ldoption, -Wl$(comma)--build-id,))
616 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
617 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
619 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
620 LDFLAGS_vmlinux += $(call ld-option, -X,)
623 # Default kernel image to build when no specific target is given.
624 # KBUILD_IMAGE may be overruled on the command line or
625 # set in the environment
626 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
628 export KBUILD_IMAGE ?= vmlinux
631 # INSTALL_PATH specifies where to place the updated kernel and system map
632 # images. Default is /boot, but you can set it to other values
633 export INSTALL_PATH ?= /boot
636 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
637 # relocations required by build roots. This is not defined in the
638 # makefile but the argument can be passed to make if needed.
641 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
645 # INSTALL_MOD_STRIP, if defined, will cause modules to be
646 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
647 # the default option --strip-debug will be used. Otherwise,
648 # INSTALL_MOD_STRIP will used as the options to the strip command.
650 ifdef INSTALL_MOD_STRIP
651 ifeq ($(INSTALL_MOD_STRIP),1)
652 mod_strip_cmd = $(STRIP) --strip-debug
654 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
655 endif # INSTALL_MOD_STRIP=1
658 endif # INSTALL_MOD_STRIP
662 ifeq ($(KBUILD_EXTMOD),)
663 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
665 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
666 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
667 $(net-y) $(net-m) $(libs-y) $(libs-m)))
669 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
671 $(core-n) $(core-) $(drivers-n) $(drivers-) \
672 $(net-n) $(net-) $(libs-n) $(libs-))))
674 init-y := $(patsubst %/, %/built-in.o, $(init-y))
675 core-y := $(patsubst %/, %/built-in.o, $(core-y))
676 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
677 net-y := $(patsubst %/, %/built-in.o, $(net-y))
678 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
679 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
680 libs-y := $(libs-y1) $(libs-y2)
683 # ---------------------------------------------------------------------------
684 # vmlinux is built from the objects selected by $(vmlinux-init) and
685 # $(vmlinux-main). Most are built-in.o files from top-level directories
686 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
687 # Ordering when linking is important, and $(vmlinux-init) must be first.
692 # +-< $(vmlinux-init)
693 # | +--< init/version.o + more
695 # +--< $(vmlinux-main)
696 # | +--< driver/built-in.o mm/built-in.o + more
698 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
700 # vmlinux version (uname -v) cannot be updated during normal
701 # descending-into-subdirs phase since we do not yet know if we need to
703 # Therefore this step is delayed until just before final link of vmlinux -
704 # except in the kallsyms case where it is done just before adding the
705 # symbols to the kernel.
707 # System.map is generated to document addresses of all kernel symbols
709 vmlinux-init := $(head-y) $(init-y)
710 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
711 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
712 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
713 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
715 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
716 # May be overridden by arch/$(ARCH)/Makefile
717 quiet_cmd_vmlinux__ ?= LD $@
718 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
719 -T $(vmlinux-lds) $(vmlinux-init) \
720 --start-group $(vmlinux-main) --end-group \
721 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
723 # Generate new vmlinux version
724 quiet_cmd_vmlinux_version = GEN .version
725 cmd_vmlinux_version = set -e; \
726 if [ ! -r .version ]; then \
730 mv .version .old_version; \
731 expr 0$$(cat .old_version) + 1 >.version; \
733 $(MAKE) $(build)=init
735 # Generate System.map
736 quiet_cmd_sysmap = SYSMAP
737 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
740 # If CONFIG_KALLSYMS is set .version is already updated
741 # Generate System.map and verify that the content is consistent
742 # Use + in front of the vmlinux_version rule to silent warning with make -j2
743 # First command is ':' to allow us to use + in front of the rule
744 define rule_vmlinux__
746 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
748 $(call cmd,vmlinux__)
749 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
751 $(Q)$(if $($(quiet)cmd_sysmap), \
752 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
753 $(cmd_sysmap) $@ System.map; \
754 if [ $$? -ne 0 ]; then \
762 ifdef CONFIG_KALLSYMS
763 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
764 # It's a three stage process:
765 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
767 # Running kallsyms on that gives us .tmp_kallsyms1.o with
768 # the right size - vmlinux version (uname -v) is updated during this step
769 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
770 # but due to the added section, some addresses have shifted.
771 # From here, we generate a correct .tmp_kallsyms2.o
772 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
773 # o Verify that the System.map from vmlinux matches the map from
774 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
775 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
776 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
777 # temporary bypass to allow the kernel to be built while the
778 # maintainers work out what went wrong with kallsyms.
780 ifdef CONFIG_KALLSYMS_EXTRA_PASS
786 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
788 define verify_kallsyms
789 $(Q)$(if $($(quiet)cmd_sysmap), \
790 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
791 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
792 $(Q)cmp -s System.map .tmp_System.map || \
793 (echo Inconsistent kallsyms data; \
794 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
795 rm .tmp_kallsyms* ; /bin/false )
798 # Update vmlinux version before link
799 # Use + in front of this rule to silent warning about make -j1
800 # First command is ':' to allow us to use + in front of this rule
801 cmd_ksym_ld = $(cmd_vmlinux__)
804 +$(call cmd,vmlinux_version)
805 $(call cmd,vmlinux__)
806 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
809 # Generate .S file with all kernel symbols
810 quiet_cmd_kallsyms = KSYM $@
811 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
812 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
814 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
815 $(call if_changed_dep,as_o_S)
817 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
820 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
821 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
822 $(call if_changed_rule,ksym_ld)
824 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
825 $(call if_changed,vmlinux__)
827 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
828 $(call if_changed,vmlinux__)
830 # Needs to visit scripts/ before $(KALLSYMS) can be used.
831 $(KALLSYMS): scripts ;
833 # Generate some data for debugging strange kallsyms problems
834 debug_kallsyms: .tmp_map$(last_kallsyms)
836 .tmp_map%: .tmp_vmlinux% FORCE
837 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
843 endif # ifdef CONFIG_KALLSYMS
845 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
846 # relevant sections renamed as per the linker script.
847 quiet_cmd_vmlinux-modpost = LD $@
848 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
849 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
850 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
851 define rule_vmlinux-modpost
853 +$(call cmd,vmlinux-modpost)
854 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
855 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
858 # vmlinux image - including updated kernel symbols
859 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
860 ifdef CONFIG_HEADERS_CHECK
861 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
864 $(Q)$(MAKE) $(build)=samples
866 ifdef CONFIG_BUILD_DOCSRC
867 $(Q)$(MAKE) $(build)=Documentation
869 $(call vmlinux-modpost)
870 $(call if_changed_rule,vmlinux__)
871 $(Q)rm -f .old_version
873 # build vmlinux.o first to catch section mismatch errors early
874 ifdef CONFIG_KALLSYMS
875 .tmp_vmlinux1: vmlinux.o
878 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
879 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
880 $(call if_changed_rule,vmlinux-modpost)
882 # The actual objects are generated when descending,
883 # make sure no implicit rule kicks in
884 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
886 # Handle descending into subdirectories listed in $(vmlinux-dirs)
887 # Preset locale variables to speed up the build process. Limit locale
888 # tweaks to this spot to avoid wrong language settings when running
889 # make menuconfig etc.
890 # Error messages still appears in the original language
892 PHONY += $(vmlinux-dirs)
893 $(vmlinux-dirs): prepare scripts
894 $(Q)$(MAKE) $(build)=$@
896 # Store (new) KERNELRELASE string in include/config/kernel.release
897 include/config/kernel.release: include/config/auto.conf FORCE
899 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
902 # Things we need to do before we recursively start building the kernel
903 # or the modules are listed in "prepare".
904 # A multi level approach is used. prepareN is processed before prepareN-1.
905 # archprepare is used in arch Makefiles and when processed asm symlink,
906 # version.h and scripts_basic is processed / created.
908 # Listed in dependency order
909 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
911 # prepare3 is used to check if we are building in a separate output directory,
913 # 1) Check that make has not been executed in the kernel src $(srctree)
914 prepare3: include/config/kernel.release
915 ifneq ($(KBUILD_SRC),)
916 @$(kecho) ' Using $(srctree) as source for kernel'
917 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
918 echo " $(srctree) is not clean, please run 'make mrproper'";\
919 echo " in the '$(srctree)' directory.";\
924 # prepare2 creates a makefile if using a separate output directory
925 prepare2: prepare3 outputmakefile
927 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
928 include/config/auto.conf
931 archprepare: prepare1 scripts_basic
933 prepare0: archprepare FORCE
934 $(Q)$(MAKE) $(build)=.
935 $(Q)$(MAKE) $(build)=. missing-syscalls
937 # All the preparing..
940 # Generate some files
941 # ---------------------------------------------------------------------------
943 # KERNELRELEASE can change from a few different places, meaning version.h
944 # needs to be updated, so this check is forced on all builds
947 define filechk_utsrelease.h
948 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
949 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
952 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
955 define filechk_version.h
956 (echo \#define LINUX_VERSION_CODE $(shell \
957 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
958 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
961 include/linux/version.h: $(srctree)/Makefile FORCE
962 $(call filechk,version.h)
964 include/generated/utsrelease.h: include/config/kernel.release FORCE
965 $(call filechk,utsrelease.h)
969 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
971 # ---------------------------------------------------------------------------
975 @echo '*** Warning: make $@ is unnecessary now.'
977 # ---------------------------------------------------------------------------
979 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
980 export INSTALL_FW_PATH
982 PHONY += firmware_install
983 firmware_install: FORCE
984 @mkdir -p $(objtree)/firmware
985 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
987 # ---------------------------------------------------------------------------
990 #Default location for installed headers
991 export INSTALL_HDR_PATH = $(objtree)/usr
993 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
995 # If we do an all arch process set dst to asm-$(hdr-arch)
996 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
999 __headers: include/linux/version.h scripts_basic FORCE
1000 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1002 PHONY += headers_install_all
1003 headers_install_all:
1004 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1006 PHONY += headers_install
1007 headers_install: __headers
1008 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1009 $(error Headers not exportable for the $(SRCARCH) architecture))
1010 $(Q)$(MAKE) $(hdr-inst)=include
1011 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1013 PHONY += headers_check_all
1014 headers_check_all: headers_install_all
1015 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1017 PHONY += headers_check
1018 headers_check: headers_install
1019 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1020 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1022 # ---------------------------------------------------------------------------
1025 ifdef CONFIG_MODULES
1027 # By default, build modules as well
1033 # A module can be listed more than once in obj-m resulting in
1034 # duplicate lines in modules.order files. Those are removed
1035 # using awk while concatenating to the final file.
1038 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1039 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1040 @$(kecho) ' Building modules, stage 2.';
1041 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1042 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1044 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1045 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1047 %/modules.builtin: include/config/auto.conf
1048 $(Q)$(MAKE) $(modbuiltin)=$*
1051 # Target to prepare building external modules
1052 PHONY += modules_prepare
1053 modules_prepare: prepare scripts
1055 # Target to install modules
1056 PHONY += modules_install
1057 modules_install: _modinst_ _modinst_post
1061 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1062 echo "Warning: you may need to install module-init-tools"; \
1063 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1066 @rm -rf $(MODLIB)/kernel
1067 @rm -f $(MODLIB)/source
1068 @mkdir -p $(MODLIB)/kernel
1069 @ln -s $(srctree) $(MODLIB)/source
1070 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1071 rm -f $(MODLIB)/build ; \
1072 ln -s $(objtree) $(MODLIB)/build ; \
1074 @cp -f $(objtree)/modules.order $(MODLIB)/
1075 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1076 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1078 # This depmod is only for convenience to give the initial
1079 # boot a modules.dep even before / is mounted read-write. However the
1080 # boot script depmod is the master version.
1081 PHONY += _modinst_post
1082 _modinst_post: _modinst_
1083 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1086 else # CONFIG_MODULES
1088 # Modules not configured
1089 # ---------------------------------------------------------------------------
1091 modules modules_install: FORCE
1093 @echo "The present kernel configuration has modules disabled."
1094 @echo "Type 'make config' and enable loadable module support."
1095 @echo "Then build a kernel with module support enabled."
1099 endif # CONFIG_MODULES
1102 # Cleaning is done on three levels.
1103 # make clean Delete most generated files
1104 # Leave enough to build external modules
1105 # make mrproper Delete the current configuration, and all generated files
1106 # make distclean Remove editor backup files, patch leftover files and the like
1108 # Directories & files removed with 'make clean'
1109 CLEAN_DIRS += $(MODVERDIR)
1110 CLEAN_FILES += vmlinux System.map \
1111 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1113 # Directories & files removed with 'make mrproper'
1114 MRPROPER_DIRS += include/config usr/include include/generated
1115 MRPROPER_FILES += .config .config.old .version .old_version \
1116 include/linux/version.h \
1117 Module.symvers tags TAGS cscope*
1119 # clean - Delete most, but leave enough to build external modules
1121 clean: rm-dirs := $(CLEAN_DIRS)
1122 clean: rm-files := $(CLEAN_FILES)
1123 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1125 PHONY += $(clean-dirs) clean archclean
1127 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1129 clean: archclean $(clean-dirs)
1132 @find . $(RCS_FIND_IGNORE) \
1133 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1134 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1135 -o -name '*.symtypes' -o -name 'modules.order' \
1136 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1137 -o -name '*.gcno' \) -type f -print | xargs rm -f
1139 # mrproper - Delete all generated files, including .config
1141 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1142 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1143 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1145 PHONY += $(mrproper-dirs) mrproper archmrproper
1147 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1149 mrproper: clean archmrproper $(mrproper-dirs)
1158 @find $(srctree) $(RCS_FIND_IGNORE) \
1159 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1160 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1161 -o -name '.*.rej' -o -size 0 \
1162 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1163 -type f -print | xargs rm -f
1166 # Packaging of the kernel to various formats
1167 # ---------------------------------------------------------------------------
1168 # rpm target kept for backward compatibility
1169 package-dir := $(srctree)/scripts/package
1172 $(Q)$(MAKE) $(build)=$(package-dir) $@
1173 %pkg: include/config/kernel.release FORCE
1174 $(Q)$(MAKE) $(build)=$(package-dir) $@
1175 rpm: include/config/kernel.release FORCE
1176 $(Q)$(MAKE) $(build)=$(package-dir) $@
1179 # Brief documentation of the typical targets used
1180 # ---------------------------------------------------------------------------
1182 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1183 boards := $(notdir $(boards))
1184 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1185 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1188 @echo 'Cleaning targets:'
1189 @echo ' clean - Remove most generated files but keep the config and'
1190 @echo ' enough build support to build external modules'
1191 @echo ' mrproper - Remove all generated files + config + various backup files'
1192 @echo ' distclean - mrproper + remove editor backup and patch files'
1194 @echo 'Configuration targets:'
1195 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1197 @echo 'Other generic targets:'
1198 @echo ' all - Build all targets marked with [*]'
1199 @echo '* vmlinux - Build the bare kernel'
1200 @echo '* modules - Build all modules'
1201 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1202 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1203 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1204 @echo ' dir/ - Build all files in dir and below'
1205 @echo ' dir/file.[oisS] - Build specified target only'
1206 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1207 @echo ' (requires a recent binutils and recent build (System.map))'
1208 @echo ' dir/file.ko - Build module including final link'
1209 @echo ' modules_prepare - Set up for building external modules'
1210 @echo ' tags/TAGS - Generate tags file for editors'
1211 @echo ' cscope - Generate cscope index'
1212 @echo ' kernelrelease - Output the release version string'
1213 @echo ' kernelversion - Output the version stored in Makefile'
1214 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1215 echo ' (default: $(INSTALL_HDR_PATH))'; \
1217 @echo 'Static analysers'
1218 @echo ' checkstack - Generate a list of stack hogs'
1219 @echo ' namespacecheck - Name space analysis on compiled kernel'
1220 @echo ' versioncheck - Sanity check on version.h usage'
1221 @echo ' includecheck - Check for duplicate included header files'
1222 @echo ' export_report - List the usages of all exported symbols'
1223 @echo ' headers_check - Sanity check on exported headers'
1224 @echo ' headerdep - Detect inclusion cycles in headers'
1225 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1227 @echo 'Kernel packaging:'
1228 @$(MAKE) $(build)=$(package-dir) help
1230 @echo 'Documentation targets:'
1231 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1233 @echo 'Architecture specific targets ($(SRCARCH)):'
1234 @$(if $(archhelp),$(archhelp),\
1235 echo ' No architecture specific help defined for $(SRCARCH)')
1238 $(foreach b, $(boards), \
1239 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1241 @$(if $(board-dirs), \
1242 $(foreach b, $(board-dirs), \
1243 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1244 printf " %-16s - Show all of the above\\n" help-boards; \
1247 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1248 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1249 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1250 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1251 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1253 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1254 @echo 'For further info see the ./README file'
1257 help-board-dirs := $(addprefix help-,$(board-dirs))
1259 help-boards: $(help-board-dirs)
1261 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1263 $(help-board-dirs): help-%:
1264 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1265 @$(if $(boards-per-dir), \
1266 $(foreach b, $(boards-per-dir), \
1267 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1271 # Documentation targets
1272 # ---------------------------------------------------------------------------
1273 %docs: scripts_basic FORCE
1274 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1276 else # KBUILD_EXTMOD
1279 # External module support.
1280 # When building external modules the kernel used as basis is considered
1281 # read-only, and no consistency checks are made and the make
1282 # system is not used on the basis kernel. If updates are required
1283 # in the basis kernel ordinary make commands (without M=...) must
1286 # The following are the only valid targets when building external
1288 # make M=dir clean Delete all automatically generated files
1289 # make M=dir modules Make all modules in specified dir
1290 # make M=dir Same as 'make M=dir modules'
1291 # make M=dir modules_install
1292 # Install the modules built in the module directory
1293 # Assumes install directory is already created
1295 # We are always building modules
1297 PHONY += crmodverdir
1301 PHONY += $(objtree)/Module.symvers
1302 $(objtree)/Module.symvers:
1303 @test -e $(objtree)/Module.symvers || ( \
1305 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1306 echo " is missing; modules will have no dependencies and modversions."; \
1309 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1310 PHONY += $(module-dirs) modules
1311 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1312 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1314 modules: $(module-dirs)
1315 @$(kecho) ' Building modules, stage 2.';
1316 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1318 PHONY += modules_install
1319 modules_install: _emodinst_ _emodinst_post
1321 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1324 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1325 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1327 PHONY += _emodinst_post
1328 _emodinst_post: _emodinst_
1331 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1333 PHONY += $(clean-dirs) clean
1335 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1337 clean: rm-dirs := $(MODVERDIR)
1338 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1339 $(KBUILD_EXTMOD)/modules.order \
1340 $(KBUILD_EXTMOD)/modules.builtin
1341 clean: $(clean-dirs)
1344 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1345 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1346 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1347 -o -name '*.gcno' \) -type f -print | xargs rm -f
1350 @echo ' Building external modules.'
1351 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1353 @echo ' modules - default target, build the module(s)'
1354 @echo ' modules_install - install the module'
1355 @echo ' clean - remove generated files in module directory only'
1359 PHONY += prepare scripts
1362 endif # KBUILD_EXTMOD
1364 # Generate tags for editors
1365 # ---------------------------------------------------------------------------
1366 quiet_cmd_tags = GEN $@
1367 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1369 tags TAGS cscope: FORCE
1372 # Scripts to check various things for consistency
1373 # ---------------------------------------------------------------------------
1376 find * $(RCS_FIND_IGNORE) \
1377 -name '*.[hcS]' -type f -print | sort \
1378 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1381 find * $(RCS_FIND_IGNORE) \
1382 -name '*.[hcS]' -type f -print | sort \
1383 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1386 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1389 $(PERL) $(srctree)/scripts/namespace.pl
1392 $(PERL) $(srctree)/scripts/export_report.pl
1394 endif #ifeq ($(config-targets),1)
1395 endif #ifeq ($(mixed-targets),1)
1397 PHONY += checkstack kernelrelease kernelversion
1399 # UML needs a little special treatment here. It wants to use the host
1400 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1401 # else wants $(ARCH), including people doing cross-builds, which means
1402 # that $(SUBARCH) doesn't work here.
1404 CHECKSTACK_ARCH := $(SUBARCH)
1406 CHECKSTACK_ARCH := $(ARCH)
1409 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1410 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1412 kernelrelease: include/config/kernel.release
1413 @echo $(KERNELRELEASE)
1416 @echo $(KERNELVERSION)
1419 # ---------------------------------------------------------------------------
1420 # Single targets are compatible with:
1421 # - build with mixed source and output
1422 # - build with separate output dir 'make O=...'
1423 # - external modules
1425 # target-dir => where to store outputfile
1426 # build-dir => directory in kernel source tree to use
1428 ifeq ($(KBUILD_EXTMOD),)
1429 build-dir = $(patsubst %/,%,$(dir $@))
1430 target-dir = $(dir $@)
1432 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1433 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1434 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1437 %.s: %.c prepare scripts FORCE
1438 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1439 %.i: %.c prepare scripts FORCE
1440 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1441 %.o: %.c prepare scripts FORCE
1442 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1443 %.lst: %.c prepare scripts FORCE
1444 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1445 %.s: %.S prepare scripts FORCE
1446 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1447 %.o: %.S prepare scripts FORCE
1448 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1449 %.symtypes: %.c prepare scripts FORCE
1450 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1453 /: prepare scripts FORCE
1455 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1456 $(build)=$(build-dir)
1457 %/: prepare scripts FORCE
1459 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1460 $(build)=$(build-dir)
1461 %.ko: prepare scripts FORCE
1463 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1464 $(build)=$(build-dir) $(@:.ko=.o)
1465 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1467 # FIXME Should go into a make.lib or something
1468 # ===========================================================================
1470 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1471 cmd_rmdirs = rm -rf $(rm-dirs)
1473 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1474 cmd_rmfiles = rm -f $(rm-files)
1476 # Run depmod only if we have System.map and depmod is executable
1477 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1479 if [ -r System.map -a -x $(DEPMOD) ]; then \
1480 $(DEPMOD) -ae -F System.map \
1481 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1485 # Create temporary dir for module support files
1486 # clean it up only when building all modules
1487 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1488 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1490 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1491 $(KBUILD_AFLAGS_KERNEL) \
1492 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1493 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1495 quiet_cmd_as_o_S = AS $@
1496 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1498 # read all saved command lines
1500 targets := $(wildcard $(sort $(targets)))
1501 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1503 ifneq ($(cmd_files),)
1504 $(cmd_files): ; # Do not try to update included dependency files
1505 include $(cmd_files)
1508 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1510 # $(Q)$(MAKE) $(clean)=dir
1511 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1513 endif # skip-makefile
1518 # Declare the contents of the .PHONY variable as phony. We keep that
1519 # information in a variable so we can use it in if_changed and friends.