5 NAME = Man-Eating Seals of Antiquity
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 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
38 ifeq ("$(origin V)", "command line")
45 # Call a source code checker (by default, "sparse") as part of the
48 # Use 'make C=1' to enable checking of only re-compiled files.
49 # Use 'make C=2' to enable checking of *all* source files, regardless
50 # of whether they are re-compiled or not.
52 # See the file "Documentation/sparse.txt" for more details, including
53 # where to get the "sparse" utility.
55 ifeq ("$(origin C)", "command line")
56 KBUILD_CHECKSRC = $(C)
58 ifndef KBUILD_CHECKSRC
62 # Use make M=dir to specify directory of external module to build
63 # Old syntax make ... SUBDIRS=$PWD is still supported
64 # Setting the environment variable KBUILD_EXTMOD take precedence
66 KBUILD_EXTMOD ?= $(SUBDIRS)
69 ifeq ("$(origin M)", "command line")
73 # kbuild supports saving output files in a separate directory.
74 # To locate output files in a separate directory two syntaxes are supported.
75 # In both cases the working directory must be the root of the kernel src.
77 # Use "make O=dir/to/store/output/files/"
79 # 2) Set KBUILD_OUTPUT
80 # Set the environment variable KBUILD_OUTPUT to point to the directory
81 # where the output files shall be placed.
82 # export KBUILD_OUTPUT=dir/to/store/output/files/
85 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
89 # KBUILD_SRC is set on invocation of make in OBJ directory
90 # KBUILD_SRC is not intended to be used by the regular user (for now)
93 # OK, Make called in directory where kernel src resides
94 # Do we want to locate output files in a separate directory?
95 ifeq ("$(origin O)", "command line")
99 # That's our default target when none is given on the command line
103 # Cancel implicit rules on top Makefile
104 $(CURDIR)/Makefile Makefile: ;
106 ifneq ($(KBUILD_OUTPUT),)
107 # Invoke a second make in the output directory, passing relevant variables
108 # check that the output directory actually exists
109 saved-output := $(KBUILD_OUTPUT)
110 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
111 $(if $(KBUILD_OUTPUT),, \
112 $(error output directory "$(saved-output)" does not exist))
114 PHONY += $(MAKECMDGOALS) sub-make
116 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
120 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
121 KBUILD_SRC=$(CURDIR) \
122 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
123 $(filter-out _all sub-make,$(MAKECMDGOALS))
125 # Leave processing to above invocation of make
127 endif # ifneq ($(KBUILD_OUTPUT),)
128 endif # ifeq ($(KBUILD_SRC),)
130 # We process the rest of the Makefile if this is the final invocation of make
131 ifeq ($(skip-makefile),)
133 # If building an external module we do not care about the all: rule
134 # but instead _all depend on modules
136 ifeq ($(KBUILD_EXTMOD),)
142 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
147 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
149 export srctree objtree VPATH
152 # SUBARCH tells the usermode build what the underlying arch is. That is set
153 # first, and if a usermode build is happening, the "ARCH=um" on the command
154 # line overrides the setting of ARCH below. If a native build is happening,
155 # then ARCH is assigned, getting whatever value it gets normally, and
156 # SUBARCH is subsequently ignored.
158 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
159 -e s/arm.*/arm/ -e s/sa110/arm/ \
160 -e s/s390x/s390/ -e s/parisc64/parisc/ \
161 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
164 # Cross compiling and selecting different set of gcc/bin-utils
165 # ---------------------------------------------------------------------------
167 # When performing cross compilation for other architectures ARCH shall be set
168 # to the target architecture. (See arch/* for the possibilities).
169 # ARCH can be set during invocation of make:
171 # Another way is to have ARCH set in the environment.
172 # The default ARCH is the host where make is executed.
174 # CROSS_COMPILE specify the prefix used for all executables used
175 # during compilation. Only gcc and related bin-utils executables
176 # are prefixed with $(CROSS_COMPILE).
177 # CROSS_COMPILE can be set on the command line
178 # make CROSS_COMPILE=ia64-linux-
179 # Alternatively CROSS_COMPILE can be set in the environment.
180 # Default value for CROSS_COMPILE is not to prefix executables
181 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
182 export KBUILD_BUILDHOST := $(SUBARCH)
186 # Architecture as present in compile.h
187 UTS_MACHINE := $(ARCH)
190 # Additional ARCH settings for x86
194 ifeq ($(ARCH),x86_64)
198 # Additional ARCH settings for sparc
199 ifeq ($(ARCH),sparc64)
203 # Additional ARCH settings for sh
208 # Where to locate arch specific headers
209 hdr-arch := $(SRCARCH)
211 ifeq ($(ARCH),m68knommu)
215 KCONFIG_CONFIG ?= .config
217 # SHELL used by kbuild
218 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
219 else if [ -x /bin/bash ]; then echo /bin/bash; \
220 else echo sh; fi ; fi)
224 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
227 # Decide whether to build built-in, modular, or both.
228 # Normally, just do built-in.
233 # If we have only "make modules", don't compile built-in objects.
234 # When we're building modules with modversions, we need to consider
235 # the built-in objects during the descend as well, in order to
236 # make sure the checksums are up to date before we record them.
238 ifeq ($(MAKECMDGOALS),modules)
239 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
242 # If we have "make <whatever> modules", compile modules
243 # in addition to whatever we do anyway.
244 # Just "make" or "make all" shall build modules as well
246 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
250 ifeq ($(MAKECMDGOALS),)
254 export KBUILD_MODULES KBUILD_BUILTIN
255 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
258 # ---------------------------------------------------------------------------
260 # Normally, we echo the whole command before executing it. By making
261 # that echo $($(quiet)$(cmd)), we now have the possibility to set
262 # $(quiet) to choose other forms of output instead, e.g.
264 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
265 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
267 # If $(quiet) is empty, the whole command will be printed.
268 # If it is set to "quiet_", only the short version will be printed.
269 # If it is set to "silent_", nothing will be printed at all, since
270 # the variable $(silent_cmd_cc_o_c) doesn't exist.
272 # A simple variant is to prefix commands with $(Q) - that's useful
273 # for commands that shall be hidden in non-verbose mode.
277 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
278 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
280 ifeq ($(KBUILD_VERBOSE),1)
288 # If the user is running make -s (silent mode), suppress echoing of
291 ifneq ($(findstring s,$(MAKEFLAGS)),)
295 export quiet Q KBUILD_VERBOSE
298 # Look for make include files relative to root of kernel src
299 MAKEFLAGS += --include-dir=$(srctree)
301 # We need some generic definitions (do not try to remake the file).
302 $(srctree)/scripts/Kbuild.include: ;
303 include $(srctree)/scripts/Kbuild.include
305 # Make variables (CC, etc...)
307 AS = $(CROSS_COMPILE)as
308 LD = $(CROSS_COMPILE)ld
309 CC = $(CROSS_COMPILE)gcc
311 AR = $(CROSS_COMPILE)ar
312 NM = $(CROSS_COMPILE)nm
313 STRIP = $(CROSS_COMPILE)strip
314 OBJCOPY = $(CROSS_COMPILE)objcopy
315 OBJDUMP = $(CROSS_COMPILE)objdump
317 GENKSYMS = scripts/genksyms/genksyms
318 INSTALLKERNEL := installkernel
319 DEPMOD = /sbin/depmod
320 KALLSYMS = scripts/kallsyms
324 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
325 -Wbitwise -Wno-return-void $(CF)
327 CFLAGS_MODULE = $(MODFLAGS)
328 AFLAGS_MODULE = $(MODFLAGS)
329 LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds
332 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
335 # Use LINUXINCLUDE when you must reference the include/ directory.
336 # Needed to be compatible with the O= option
337 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
338 $(if $(KBUILD_SRC), -I$(srctree)/include) \
339 -include include/generated/autoconf.h
341 KBUILD_CPPFLAGS := -D__KERNEL__
343 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
344 -fno-strict-aliasing -fno-common \
345 -Werror-implicit-function-declaration \
346 -Wno-format-security \
347 -fno-delete-null-pointer-checks
348 KBUILD_AFLAGS := -D__ASSEMBLY__
350 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
351 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
352 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
354 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
355 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
356 export CPP AR NM STRIP OBJCOPY OBJDUMP
357 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
358 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
360 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
361 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
362 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
364 # When compiling out-of-tree modules, put MODVERDIR in the module
365 # tree rather than in the kernel tree. The kernel tree might
367 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
369 # Files to ignore in find ... statements
371 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
372 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
374 # ===========================================================================
375 # Rules shared between *config targets and build targets
377 # Basic helpers built in scripts/
378 PHONY += scripts_basic
380 $(Q)$(MAKE) $(build)=scripts/basic
381 $(Q)rm -f .tmp_quiet_recordmcount
383 # To avoid any implicit rule to kick in, define an empty command.
384 scripts/basic/%: scripts_basic ;
386 PHONY += outputmakefile
387 # outputmakefile generates a Makefile in the output directory, if using a
388 # separate output directory. This allows convenient use of make in the
391 ifneq ($(KBUILD_SRC),)
392 $(Q)ln -fsn $(srctree) source
393 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
394 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
397 # To make sure we do not include .config for any of the *config targets
398 # catch them early, and hand them over to scripts/kconfig/Makefile
399 # It is allowed to specify more targets when calling make, including
400 # mixing *config targets and build targets.
401 # For example 'make oldconfig all'.
402 # Detect when mixed targets is specified, and make a second invocation
403 # of make so .config is not included in this case either (for *config).
405 no-dot-config-targets := clean mrproper distclean \
406 cscope TAGS tags help %docs check% \
407 include/linux/version.h headers_% \
408 kernelrelease kernelversion
414 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
415 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
420 ifeq ($(KBUILD_EXTMOD),)
421 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
423 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
429 ifeq ($(mixed-targets),1)
430 # ===========================================================================
431 # We're called with mixed targets (*config and build targets).
432 # Handle them one by one.
435 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
438 ifeq ($(config-targets),1)
439 # ===========================================================================
440 # *config targets only - make sure prerequisites are updated, and descend
441 # in scripts/kconfig to make the *config target
443 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
444 # KBUILD_DEFCONFIG may point out an alternative default configuration
445 # used for 'make defconfig'
446 include $(srctree)/arch/$(SRCARCH)/Makefile
447 export KBUILD_DEFCONFIG KBUILD_KCONFIG
449 config: scripts_basic outputmakefile FORCE
450 $(Q)mkdir -p include/linux include/config
451 $(Q)$(MAKE) $(build)=scripts/kconfig $@
453 %config: scripts_basic outputmakefile FORCE
454 $(Q)mkdir -p include/linux include/config
455 $(Q)$(MAKE) $(build)=scripts/kconfig $@
458 # ===========================================================================
459 # Build targets only - this includes vmlinux, arch specific targets, clean
460 # targets and others. In general all targets except *config targets.
462 ifeq ($(KBUILD_EXTMOD),)
463 # Additional helpers built in scripts/
464 # Carefully list dependencies so we do not try to build scripts twice
467 scripts: scripts_basic include/config/auto.conf
468 $(Q)$(MAKE) $(build)=$(@)
470 # Objects we will link into vmlinux / subdirs we need to visit
472 drivers-y := drivers/ sound/ firmware/
476 endif # KBUILD_EXTMOD
478 ifeq ($(dot-config),1)
480 -include include/config/auto.conf
482 ifeq ($(KBUILD_EXTMOD),)
483 # Read in dependencies to all Kconfig* files, make sure to run
484 # oldconfig if changes are detected.
485 -include include/config/auto.conf.cmd
487 # To avoid any implicit rule to kick in, define an empty command
488 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
490 # If .config is newer than include/config/auto.conf, someone tinkered
491 # with it and forgot to run make oldconfig.
492 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
493 # we execute the config step to be sure to catch updated Kconfig files
494 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
495 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
497 # external modules needs include/generated/autoconf.h and include/config/auto.conf
498 # but do not care if they are up-to-date. Use auto.conf to trigger the test
499 PHONY += include/config/auto.conf
501 include/config/auto.conf:
502 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
504 echo " ERROR: Kernel configuration is invalid."; \
505 echo " include/generated/autoconf.h or $@ are missing.";\
506 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
510 endif # KBUILD_EXTMOD
513 # Dummy target needed, because used as prerequisite
514 include/config/auto.conf: ;
515 endif # $(dot-config)
517 # The all: target is the default when no target is given on the
519 # This allow a user to issue only 'make' to build a kernel including modules
520 # Defaults vmlinux but it is usually overridden in the arch makefile
523 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
529 include $(srctree)/arch/$(SRCARCH)/Makefile
531 ifneq ($(CONFIG_FRAME_WARN),0)
532 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
535 # Force gcc to behave correct even for buggy distributions
536 ifndef CONFIG_CC_STACKPROTECTOR
537 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
540 ifdef CONFIG_FRAME_POINTER
541 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
543 KBUILD_CFLAGS += -fomit-frame-pointer
546 ifdef CONFIG_DEBUG_INFO
548 KBUILD_AFLAGS += -gdwarf-2
551 ifdef CONFIG_FUNCTION_TRACER
555 # We trigger additional mismatches with less inlining
556 ifdef CONFIG_DEBUG_SECTION_MISMATCH
557 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
560 # arch Makefile may override CC so keep this after arch Makefile is included
561 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
562 CHECKFLAGS += $(NOSTDINC_FLAGS)
564 # warn about C99 declaration after statement
565 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
567 # disable pointer signed / unsigned warnings in gcc 4.0
568 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
570 # disable invalid "can't wrap" optimizations for signed / pointers
571 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
573 # revert to pre-gcc-4.4 behaviour of .eh_frame
574 KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
576 # conserve stack if available
577 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
579 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
580 # But warn user when we do so
582 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
584 ifneq ($(KCPPFLAGS),)
585 $(call warn-assign,CPPFLAGS)
586 KBUILD_CPPFLAGS += $(KCPPFLAGS)
589 $(call warn-assign,AFLAGS)
590 KBUILD_AFLAGS += $(KAFLAGS)
593 $(call warn-assign,CFLAGS)
594 KBUILD_CFLAGS += $(KCFLAGS)
597 # Use --build-id when available.
598 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
599 $(call cc-ldoption, -Wl$(comma)--build-id,))
600 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
601 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
603 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
604 LDFLAGS_vmlinux += $(call ld-option, -X,)
607 # Default kernel image to build when no specific target is given.
608 # KBUILD_IMAGE may be overruled on the command line or
609 # set in the environment
610 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
612 export KBUILD_IMAGE ?= vmlinux
615 # INSTALL_PATH specifies where to place the updated kernel and system map
616 # images. Default is /boot, but you can set it to other values
617 export INSTALL_PATH ?= /boot
620 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
621 # relocations required by build roots. This is not defined in the
622 # makefile but the argument can be passed to make if needed.
625 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
629 # INSTALL_MOD_STRIP, if defined, will cause modules to be
630 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
631 # the default option --strip-debug will be used. Otherwise,
632 # INSTALL_MOD_STRIP will used as the options to the strip command.
634 ifdef INSTALL_MOD_STRIP
635 ifeq ($(INSTALL_MOD_STRIP),1)
636 mod_strip_cmd = $(STRIP) --strip-debug
638 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
639 endif # INSTALL_MOD_STRIP=1
642 endif # INSTALL_MOD_STRIP
646 ifeq ($(KBUILD_EXTMOD),)
647 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
649 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
650 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
651 $(net-y) $(net-m) $(libs-y) $(libs-m)))
653 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
655 $(core-n) $(core-) $(drivers-n) $(drivers-) \
656 $(net-n) $(net-) $(libs-n) $(libs-))))
658 init-y := $(patsubst %/, %/built-in.o, $(init-y))
659 core-y := $(patsubst %/, %/built-in.o, $(core-y))
660 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
661 net-y := $(patsubst %/, %/built-in.o, $(net-y))
662 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
663 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
664 libs-y := $(libs-y1) $(libs-y2)
667 # ---------------------------------------------------------------------------
668 # vmlinux is built from the objects selected by $(vmlinux-init) and
669 # $(vmlinux-main). Most are built-in.o files from top-level directories
670 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
671 # Ordering when linking is important, and $(vmlinux-init) must be first.
676 # +-< $(vmlinux-init)
677 # | +--< init/version.o + more
679 # +--< $(vmlinux-main)
680 # | +--< driver/built-in.o mm/built-in.o + more
682 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
684 # vmlinux version (uname -v) cannot be updated during normal
685 # descending-into-subdirs phase since we do not yet know if we need to
687 # Therefore this step is delayed until just before final link of vmlinux -
688 # except in the kallsyms case where it is done just before adding the
689 # symbols to the kernel.
691 # System.map is generated to document addresses of all kernel symbols
693 vmlinux-init := $(head-y) $(init-y)
694 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
695 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
696 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
697 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
699 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
700 # May be overridden by arch/$(ARCH)/Makefile
701 quiet_cmd_vmlinux__ ?= LD $@
702 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
703 -T $(vmlinux-lds) $(vmlinux-init) \
704 --start-group $(vmlinux-main) --end-group \
705 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
707 # Generate new vmlinux version
708 quiet_cmd_vmlinux_version = GEN .version
709 cmd_vmlinux_version = set -e; \
710 if [ ! -r .version ]; then \
714 mv .version .old_version; \
715 expr 0$$(cat .old_version) + 1 >.version; \
717 $(MAKE) $(build)=init
719 # Generate System.map
720 quiet_cmd_sysmap = SYSMAP
721 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
724 # If CONFIG_KALLSYMS is set .version is already updated
725 # Generate System.map and verify that the content is consistent
726 # Use + in front of the vmlinux_version rule to silent warning with make -j2
727 # First command is ':' to allow us to use + in front of the rule
728 define rule_vmlinux__
730 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
732 $(call cmd,vmlinux__)
733 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
735 $(Q)$(if $($(quiet)cmd_sysmap), \
736 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
737 $(cmd_sysmap) $@ System.map; \
738 if [ $$? -ne 0 ]; then \
746 ifdef CONFIG_KALLSYMS
747 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
748 # It's a three stage process:
749 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
751 # Running kallsyms on that gives us .tmp_kallsyms1.o with
752 # the right size - vmlinux version (uname -v) is updated during this step
753 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
754 # but due to the added section, some addresses have shifted.
755 # From here, we generate a correct .tmp_kallsyms2.o
756 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
757 # o Verify that the System.map from vmlinux matches the map from
758 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
759 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
760 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
761 # temporary bypass to allow the kernel to be built while the
762 # maintainers work out what went wrong with kallsyms.
764 ifdef CONFIG_KALLSYMS_EXTRA_PASS
770 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
772 define verify_kallsyms
773 $(Q)$(if $($(quiet)cmd_sysmap), \
774 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
775 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
776 $(Q)cmp -s System.map .tmp_System.map || \
777 (echo Inconsistent kallsyms data; \
778 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
779 rm .tmp_kallsyms* ; /bin/false )
782 # Update vmlinux version before link
783 # Use + in front of this rule to silent warning about make -j1
784 # First command is ':' to allow us to use + in front of this rule
785 cmd_ksym_ld = $(cmd_vmlinux__)
788 +$(call cmd,vmlinux_version)
789 $(call cmd,vmlinux__)
790 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
793 # Generate .S file with all kernel symbols
794 quiet_cmd_kallsyms = KSYM $@
795 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
796 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
798 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
799 $(call if_changed_dep,as_o_S)
801 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
804 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
805 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
806 $(call if_changed_rule,ksym_ld)
808 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
809 $(call if_changed,vmlinux__)
811 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
812 $(call if_changed,vmlinux__)
814 # Needs to visit scripts/ before $(KALLSYMS) can be used.
815 $(KALLSYMS): scripts ;
817 # Generate some data for debugging strange kallsyms problems
818 debug_kallsyms: .tmp_map$(last_kallsyms)
820 .tmp_map%: .tmp_vmlinux% FORCE
821 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
827 endif # ifdef CONFIG_KALLSYMS
829 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
830 # relevant sections renamed as per the linker script.
831 quiet_cmd_vmlinux-modpost = LD $@
832 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
833 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
834 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
835 define rule_vmlinux-modpost
837 +$(call cmd,vmlinux-modpost)
838 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
839 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
842 # vmlinux image - including updated kernel symbols
843 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
844 ifdef CONFIG_HEADERS_CHECK
845 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
848 $(Q)$(MAKE) $(build)=samples
850 ifdef CONFIG_BUILD_DOCSRC
851 $(Q)$(MAKE) $(build)=Documentation
853 $(call vmlinux-modpost)
854 $(call if_changed_rule,vmlinux__)
855 $(Q)rm -f .old_version
857 # build vmlinux.o first to catch section mismatch errors early
858 ifdef CONFIG_KALLSYMS
859 .tmp_vmlinux1: vmlinux.o
862 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
863 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
864 $(call if_changed_rule,vmlinux-modpost)
866 # The actual objects are generated when descending,
867 # make sure no implicit rule kicks in
868 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
870 # Handle descending into subdirectories listed in $(vmlinux-dirs)
871 # Preset locale variables to speed up the build process. Limit locale
872 # tweaks to this spot to avoid wrong language settings when running
873 # make menuconfig etc.
874 # Error messages still appears in the original language
876 PHONY += $(vmlinux-dirs)
877 $(vmlinux-dirs): prepare scripts
878 $(Q)$(MAKE) $(build)=$@
880 # Build the kernel release string
882 # The KERNELRELEASE value built here is stored in the file
883 # include/config/kernel.release, and is used when executing several
884 # make targets, such as "make install" or "make modules_install."
886 # The eventual kernel release string consists of the following fields,
887 # shown in a hierarchical format to show how smaller parts are concatenated
888 # to form the larger and final value, with values coming from places like
889 # the Makefile, kernel config options, make command line options and/or
890 # SCM tag information.
894 # $(PATCHLEVEL) eg, 6
896 # $(EXTRAVERSION) eg, -rc6
899 # localversion* (files without backups, containing '~')
900 # $(CONFIG_LOCALVERSION) (from kernel config setting)
901 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
902 # ./scripts/setlocalversion (SCM tag, if one exists)
903 # $(LOCALVERSION) (from make command line if provided)
905 # Note how the final $(localver-auto) string is included *only* if the
906 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
907 # moment, only git is supported but other SCMs can edit the script
908 # scripts/setlocalversion and add the appropriate checks as needed.
910 pattern = ".*/localversion[^~]*"
911 string = $(shell cat /dev/null \
912 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
914 localver = $(subst $(space),, $(string) \
915 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
917 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
918 # and if the SCM is know a tag from the SCM is appended.
919 # The appended tag is determined by the SCM used.
921 # .scmversion is used when generating rpm packages so we do not loose
922 # the version information from the SCM when we do the build of the kernel
923 # from the copied source
924 ifdef CONFIG_LOCALVERSION_AUTO
926 ifeq ($(wildcard .scmversion),)
927 _localver-auto = $(shell $(CONFIG_SHELL) \
928 $(srctree)/scripts/setlocalversion $(srctree))
930 _localver-auto = $(shell cat .scmversion 2> /dev/null)
933 localver-auto = $(LOCALVERSION)$(_localver-auto)
936 localver-full = $(localver)$(localver-auto)
938 # Store (new) KERNELRELASE string in include/config/kernel.release
939 kernelrelease = $(KERNELVERSION)$(localver-full)
940 include/config/kernel.release: include/config/auto.conf FORCE
942 $(Q)echo $(kernelrelease) > $@
945 # Things we need to do before we recursively start building the kernel
946 # or the modules are listed in "prepare".
947 # A multi level approach is used. prepareN is processed before prepareN-1.
948 # archprepare is used in arch Makefiles and when processed asm symlink,
949 # version.h and scripts_basic is processed / created.
951 # Listed in dependency order
952 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
954 # prepare3 is used to check if we are building in a separate output directory,
956 # 1) Check that make has not been executed in the kernel src $(srctree)
957 prepare3: include/config/kernel.release
958 ifneq ($(KBUILD_SRC),)
959 @$(kecho) ' Using $(srctree) as source for kernel'
960 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
961 echo " $(srctree) is not clean, please run 'make mrproper'";\
962 echo " in the '$(srctree)' directory.";\
967 # prepare2 creates a makefile if using a separate output directory
968 prepare2: prepare3 outputmakefile
970 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
971 include/config/auto.conf
974 archprepare: prepare1 scripts_basic
976 prepare0: archprepare FORCE
977 $(Q)$(MAKE) $(build)=.
978 $(Q)$(MAKE) $(build)=. missing-syscalls
980 # All the preparing..
983 # Generate some files
984 # ---------------------------------------------------------------------------
986 # KERNELRELEASE can change from a few different places, meaning version.h
987 # needs to be updated, so this check is forced on all builds
990 define filechk_utsrelease.h
991 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
992 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
995 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
998 define filechk_version.h
999 (echo \#define LINUX_VERSION_CODE $(shell \
1000 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1001 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1004 include/linux/version.h: $(srctree)/Makefile FORCE
1005 $(call filechk,version.h)
1007 include/generated/utsrelease.h: include/config/kernel.release FORCE
1008 $(call filechk,utsrelease.h)
1012 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1014 # ---------------------------------------------------------------------------
1018 @echo '*** Warning: make $@ is unnecessary now.'
1020 # ---------------------------------------------------------------------------
1022 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1023 export INSTALL_FW_PATH
1025 PHONY += firmware_install
1026 firmware_install: FORCE
1027 @mkdir -p $(objtree)/firmware
1028 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1030 # ---------------------------------------------------------------------------
1033 #Default location for installed headers
1034 export INSTALL_HDR_PATH = $(objtree)/usr
1036 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1038 # If we do an all arch process set dst to asm-$(hdr-arch)
1039 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1042 __headers: include/linux/version.h scripts_basic FORCE
1043 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1045 PHONY += headers_install_all
1046 headers_install_all:
1047 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1049 PHONY += headers_install
1050 headers_install: __headers
1051 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1052 $(error Headers not exportable for the $(SRCARCH) architecture))
1053 $(Q)$(MAKE) $(hdr-inst)=include
1054 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1056 PHONY += headers_check_all
1057 headers_check_all: headers_install_all
1058 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1060 PHONY += headers_check
1061 headers_check: headers_install
1062 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1063 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1065 # ---------------------------------------------------------------------------
1068 ifdef CONFIG_MODULES
1070 # By default, build modules as well
1076 # A module can be listed more than once in obj-m resulting in
1077 # duplicate lines in modules.order files. Those are removed
1078 # using awk while concatenating to the final file.
1081 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1082 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1083 @$(kecho) ' Building modules, stage 2.';
1084 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1085 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1088 # Target to prepare building external modules
1089 PHONY += modules_prepare
1090 modules_prepare: prepare scripts
1092 # Target to install modules
1093 PHONY += modules_install
1094 modules_install: _modinst_ _modinst_post
1098 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1099 echo "Warning: you may need to install module-init-tools"; \
1100 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1103 @rm -rf $(MODLIB)/kernel
1104 @rm -f $(MODLIB)/source
1105 @mkdir -p $(MODLIB)/kernel
1106 @ln -s $(srctree) $(MODLIB)/source
1107 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1108 rm -f $(MODLIB)/build ; \
1109 ln -s $(objtree) $(MODLIB)/build ; \
1111 @cp -f $(objtree)/modules.order $(MODLIB)/
1112 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1114 # This depmod is only for convenience to give the initial
1115 # boot a modules.dep even before / is mounted read-write. However the
1116 # boot script depmod is the master version.
1117 PHONY += _modinst_post
1118 _modinst_post: _modinst_
1119 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1122 else # CONFIG_MODULES
1124 # Modules not configured
1125 # ---------------------------------------------------------------------------
1127 modules modules_install: FORCE
1129 @echo "The present kernel configuration has modules disabled."
1130 @echo "Type 'make config' and enable loadable module support."
1131 @echo "Then build a kernel with module support enabled."
1135 endif # CONFIG_MODULES
1138 # Cleaning is done on three levels.
1139 # make clean Delete most generated files
1140 # Leave enough to build external modules
1141 # make mrproper Delete the current configuration, and all generated files
1142 # make distclean Remove editor backup files, patch leftover files and the like
1144 # Directories & files removed with 'make clean'
1145 CLEAN_DIRS += $(MODVERDIR)
1146 CLEAN_FILES += vmlinux System.map \
1147 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1149 # Directories & files removed with 'make mrproper'
1150 MRPROPER_DIRS += include/config usr/include include/generated
1151 MRPROPER_FILES += .config .config.old .version .old_version \
1152 include/linux/version.h \
1153 Module.symvers tags TAGS cscope*
1155 # clean - Delete most, but leave enough to build external modules
1157 clean: rm-dirs := $(CLEAN_DIRS)
1158 clean: rm-files := $(CLEAN_FILES)
1159 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1161 PHONY += $(clean-dirs) clean archclean
1163 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1165 clean: archclean $(clean-dirs)
1168 @find . $(RCS_FIND_IGNORE) \
1169 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1170 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1171 -o -name '*.symtypes' -o -name 'modules.order' \
1172 -o -name '.tmp_*.o.*' \
1173 -o -name '*.gcno' \) -type f -print | xargs rm -f
1175 # mrproper - Delete all generated files, including .config
1177 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1178 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1179 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1181 PHONY += $(mrproper-dirs) mrproper archmrproper
1183 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1185 mrproper: clean archmrproper $(mrproper-dirs)
1194 @find $(srctree) $(RCS_FIND_IGNORE) \
1195 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1196 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1197 -o -name '.*.rej' -o -size 0 \
1198 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1199 -type f -print | xargs rm -f
1202 # Packaging of the kernel to various formats
1203 # ---------------------------------------------------------------------------
1204 # rpm target kept for backward compatibility
1205 package-dir := $(srctree)/scripts/package
1207 %pkg: include/config/kernel.release FORCE
1208 $(Q)$(MAKE) $(build)=$(package-dir) $@
1209 rpm: include/config/kernel.release FORCE
1210 $(Q)$(MAKE) $(build)=$(package-dir) $@
1213 # Brief documentation of the typical targets used
1214 # ---------------------------------------------------------------------------
1216 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1217 boards := $(notdir $(boards))
1218 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1219 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1222 @echo 'Cleaning targets:'
1223 @echo ' clean - Remove most generated files but keep the config and'
1224 @echo ' enough build support to build external modules'
1225 @echo ' mrproper - Remove all generated files + config + various backup files'
1226 @echo ' distclean - mrproper + remove editor backup and patch files'
1228 @echo 'Configuration targets:'
1229 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1231 @echo 'Other generic targets:'
1232 @echo ' all - Build all targets marked with [*]'
1233 @echo '* vmlinux - Build the bare kernel'
1234 @echo '* modules - Build all modules'
1235 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1236 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1237 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1238 @echo ' dir/ - Build all files in dir and below'
1239 @echo ' dir/file.[ois] - Build specified target only'
1240 @echo ' dir/file.ko - Build module including final link'
1241 @echo ' modules_prepare - Set up for building external modules'
1242 @echo ' tags/TAGS - Generate tags file for editors'
1243 @echo ' cscope - Generate cscope index'
1244 @echo ' kernelrelease - Output the release version string'
1245 @echo ' kernelversion - Output the version stored in Makefile'
1246 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1247 echo ' (default: $(INSTALL_HDR_PATH))'; \
1249 @echo 'Static analysers'
1250 @echo ' checkstack - Generate a list of stack hogs'
1251 @echo ' namespacecheck - Name space analysis on compiled kernel'
1252 @echo ' versioncheck - Sanity check on version.h usage'
1253 @echo ' includecheck - Check for duplicate included header files'
1254 @echo ' export_report - List the usages of all exported symbols'
1255 @echo ' headers_check - Sanity check on exported headers'
1256 @echo ' headerdep - Detect inclusion cycles in headers'; \
1258 @echo 'Kernel packaging:'
1259 @$(MAKE) $(build)=$(package-dir) help
1261 @echo 'Documentation targets:'
1262 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1264 @echo 'Architecture specific targets ($(SRCARCH)):'
1265 @$(if $(archhelp),$(archhelp),\
1266 echo ' No architecture specific help defined for $(SRCARCH)')
1269 $(foreach b, $(boards), \
1270 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1272 @$(if $(board-dirs), \
1273 $(foreach b, $(board-dirs), \
1274 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1275 printf " %-16s - Show all of the above\\n" help-boards; \
1278 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1279 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1280 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1281 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1282 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1284 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1285 @echo 'For further info see the ./README file'
1288 help-board-dirs := $(addprefix help-,$(board-dirs))
1290 help-boards: $(help-board-dirs)
1292 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1294 $(help-board-dirs): help-%:
1295 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1296 @$(if $(boards-per-dir), \
1297 $(foreach b, $(boards-per-dir), \
1298 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1302 # Documentation targets
1303 # ---------------------------------------------------------------------------
1304 %docs: scripts_basic FORCE
1305 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1307 else # KBUILD_EXTMOD
1310 # External module support.
1311 # When building external modules the kernel used as basis is considered
1312 # read-only, and no consistency checks are made and the make
1313 # system is not used on the basis kernel. If updates are required
1314 # in the basis kernel ordinary make commands (without M=...) must
1317 # The following are the only valid targets when building external
1319 # make M=dir clean Delete all automatically generated files
1320 # make M=dir modules Make all modules in specified dir
1321 # make M=dir Same as 'make M=dir modules'
1322 # make M=dir modules_install
1323 # Install the modules built in the module directory
1324 # Assumes install directory is already created
1326 # We are always building modules
1328 PHONY += crmodverdir
1332 PHONY += $(objtree)/Module.symvers
1333 $(objtree)/Module.symvers:
1334 @test -e $(objtree)/Module.symvers || ( \
1336 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1337 echo " is missing; modules will have no dependencies and modversions."; \
1340 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1341 PHONY += $(module-dirs) modules
1342 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1343 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1345 modules: $(module-dirs)
1346 @$(kecho) ' Building modules, stage 2.';
1347 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1349 PHONY += modules_install
1350 modules_install: _emodinst_ _emodinst_post
1352 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1355 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1356 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1358 PHONY += _emodinst_post
1359 _emodinst_post: _emodinst_
1362 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1364 PHONY += $(clean-dirs) clean
1366 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1368 clean: rm-dirs := $(MODVERDIR)
1369 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1370 $(KBUILD_EXTMOD)/modules.order
1371 clean: $(clean-dirs)
1374 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1375 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1376 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1377 -o -name '*.gcno' \) -type f -print | xargs rm -f
1380 @echo ' Building external modules.'
1381 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1383 @echo ' modules - default target, build the module(s)'
1384 @echo ' modules_install - install the module'
1385 @echo ' clean - remove generated files in module directory only'
1389 PHONY += prepare scripts
1392 endif # KBUILD_EXTMOD
1394 # Generate tags for editors
1395 # ---------------------------------------------------------------------------
1396 quiet_cmd_tags = GEN $@
1397 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1399 tags TAGS cscope: FORCE
1402 # Scripts to check various things for consistency
1403 # ---------------------------------------------------------------------------
1406 find * $(RCS_FIND_IGNORE) \
1407 -name '*.[hcS]' -type f -print | sort \
1408 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1411 find * $(RCS_FIND_IGNORE) \
1412 -name '*.[hcS]' -type f -print | sort \
1413 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1416 $(PERL) $(srctree)/scripts/namespace.pl
1419 $(PERL) $(srctree)/scripts/export_report.pl
1421 endif #ifeq ($(config-targets),1)
1422 endif #ifeq ($(mixed-targets),1)
1424 PHONY += checkstack kernelrelease kernelversion
1426 # UML needs a little special treatment here. It wants to use the host
1427 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1428 # else wants $(ARCH), including people doing cross-builds, which means
1429 # that $(SUBARCH) doesn't work here.
1431 CHECKSTACK_ARCH := $(SUBARCH)
1433 CHECKSTACK_ARCH := $(ARCH)
1436 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1437 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1440 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1441 $(error kernelrelease not valid - run 'make prepare' to update it))
1443 @echo $(KERNELVERSION)
1446 # ---------------------------------------------------------------------------
1447 # Single targets are compatible with:
1448 # - build with mixed source and output
1449 # - build with separate output dir 'make O=...'
1450 # - external modules
1452 # target-dir => where to store outputfile
1453 # build-dir => directory in kernel source tree to use
1455 ifeq ($(KBUILD_EXTMOD),)
1456 build-dir = $(patsubst %/,%,$(dir $@))
1457 target-dir = $(dir $@)
1459 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1460 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1461 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1464 %.s: %.c prepare scripts FORCE
1465 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1466 %.i: %.c prepare scripts FORCE
1467 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1468 %.o: %.c prepare scripts FORCE
1469 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1470 %.lst: %.c prepare scripts FORCE
1471 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1472 %.s: %.S prepare scripts FORCE
1473 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1474 %.o: %.S prepare scripts FORCE
1475 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1476 %.symtypes: %.c prepare scripts FORCE
1477 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1480 /: prepare scripts FORCE
1482 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1483 $(build)=$(build-dir)
1484 %/: prepare scripts FORCE
1486 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1487 $(build)=$(build-dir)
1488 %.ko: prepare scripts FORCE
1490 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1491 $(build)=$(build-dir) $(@:.ko=.o)
1492 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1494 # FIXME Should go into a make.lib or something
1495 # ===========================================================================
1497 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1498 cmd_rmdirs = rm -rf $(rm-dirs)
1500 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1501 cmd_rmfiles = rm -f $(rm-files)
1503 # Run depmod only if we have System.map and depmod is executable
1504 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1506 if [ -r System.map -a -x $(DEPMOD) ]; then \
1507 $(DEPMOD) -ae -F System.map \
1508 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1512 # Create temporary dir for module support files
1513 # clean it up only when building all modules
1514 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1515 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1517 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1518 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1519 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1521 quiet_cmd_as_o_S = AS $@
1522 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1524 # read all saved command lines
1526 targets := $(wildcard $(sort $(targets)))
1527 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1529 ifneq ($(cmd_files),)
1530 $(cmd_files): ; # Do not try to update included dependency files
1531 include $(cmd_files)
1534 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1536 # $(Q)$(MAKE) $(clean)=dir
1537 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1539 endif # skip-makefile
1544 # Declare the contents of the .PHONY variable as phony. We keep that
1545 # information in a variable so we can use it in if_changed and friends.