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 := -Iinclude \
338 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
339 -I$(srctree)/arch/$(hdr-arch)/include \
340 -include include/linux/autoconf.h
342 KBUILD_CPPFLAGS := -D__KERNEL__
344 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
345 -fno-strict-aliasing -fno-common \
346 -Werror-implicit-function-declaration \
347 -Wno-format-security \
348 -fno-delete-null-pointer-checks
349 KBUILD_AFLAGS := -D__ASSEMBLY__
351 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
352 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
353 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
355 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
356 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
357 export CPP AR NM STRIP OBJCOPY OBJDUMP
358 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
359 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
361 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
362 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
363 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
365 # When compiling out-of-tree modules, put MODVERDIR in the module
366 # tree rather than in the kernel tree. The kernel tree might
368 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
370 # Files to ignore in find ... statements
372 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
373 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
375 # ===========================================================================
376 # Rules shared between *config targets and build targets
378 # Basic helpers built in scripts/
379 PHONY += scripts_basic
381 $(Q)$(MAKE) $(build)=scripts/basic
382 $(Q)rm -f .tmp_quiet_recordmcount
384 # To avoid any implicit rule to kick in, define an empty command.
385 scripts/basic/%: scripts_basic ;
387 PHONY += outputmakefile
388 # outputmakefile generates a Makefile in the output directory, if using a
389 # separate output directory. This allows convenient use of make in the
392 ifneq ($(KBUILD_SRC),)
393 $(Q)ln -fsn $(srctree) source
394 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
395 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
398 # To make sure we do not include .config for any of the *config targets
399 # catch them early, and hand them over to scripts/kconfig/Makefile
400 # It is allowed to specify more targets when calling make, including
401 # mixing *config targets and build targets.
402 # For example 'make oldconfig all'.
403 # Detect when mixed targets is specified, and make a second invocation
404 # of make so .config is not included in this case either (for *config).
406 no-dot-config-targets := clean mrproper distclean \
407 cscope TAGS tags help %docs check% \
408 include/linux/version.h headers_% \
409 kernelrelease kernelversion
415 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
416 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
421 ifeq ($(KBUILD_EXTMOD),)
422 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
424 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
430 ifeq ($(mixed-targets),1)
431 # ===========================================================================
432 # We're called with mixed targets (*config and build targets).
433 # Handle them one by one.
436 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
439 ifeq ($(config-targets),1)
440 # ===========================================================================
441 # *config targets only - make sure prerequisites are updated, and descend
442 # in scripts/kconfig to make the *config target
444 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
445 # KBUILD_DEFCONFIG may point out an alternative default configuration
446 # used for 'make defconfig'
447 include $(srctree)/arch/$(SRCARCH)/Makefile
448 export KBUILD_DEFCONFIG KBUILD_KCONFIG
450 config: scripts_basic outputmakefile FORCE
451 $(Q)mkdir -p include/linux include/config
452 $(Q)$(MAKE) $(build)=scripts/kconfig $@
454 %config: scripts_basic outputmakefile FORCE
455 $(Q)mkdir -p include/linux include/config
456 $(Q)$(MAKE) $(build)=scripts/kconfig $@
459 # ===========================================================================
460 # Build targets only - this includes vmlinux, arch specific targets, clean
461 # targets and others. In general all targets except *config targets.
463 ifeq ($(KBUILD_EXTMOD),)
464 # Additional helpers built in scripts/
465 # Carefully list dependencies so we do not try to build scripts twice
468 scripts: scripts_basic include/config/auto.conf
469 $(Q)$(MAKE) $(build)=$(@)
471 # Objects we will link into vmlinux / subdirs we need to visit
473 drivers-y := drivers/ sound/ firmware/
477 endif # KBUILD_EXTMOD
479 ifeq ($(dot-config),1)
481 -include include/config/auto.conf
483 ifeq ($(KBUILD_EXTMOD),)
484 # Read in dependencies to all Kconfig* files, make sure to run
485 # oldconfig if changes are detected.
486 -include include/config/auto.conf.cmd
488 # To avoid any implicit rule to kick in, define an empty command
489 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
491 # If .config is newer than include/config/auto.conf, someone tinkered
492 # with it and forgot to run make oldconfig.
493 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
494 # we execute the config step to be sure to catch updated Kconfig files
495 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
496 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
498 # external modules needs include/linux/autoconf.h and include/config/auto.conf
499 # but do not care if they are up-to-date. Use auto.conf to trigger the test
500 PHONY += include/config/auto.conf
502 include/config/auto.conf:
503 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
505 echo " ERROR: Kernel configuration is invalid."; \
506 echo " include/linux/autoconf.h or $@ are missing."; \
507 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
511 endif # KBUILD_EXTMOD
514 # Dummy target needed, because used as prerequisite
515 include/config/auto.conf: ;
516 endif # $(dot-config)
518 # The all: target is the default when no target is given on the
520 # This allow a user to issue only 'make' to build a kernel including modules
521 # Defaults vmlinux but it is usually overridden in the arch makefile
524 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
530 include $(srctree)/arch/$(SRCARCH)/Makefile
532 ifneq ($(CONFIG_FRAME_WARN),0)
533 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
536 # Force gcc to behave correct even for buggy distributions
537 ifndef CONFIG_CC_STACKPROTECTOR
538 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
541 ifdef CONFIG_FRAME_POINTER
542 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
544 KBUILD_CFLAGS += -fomit-frame-pointer
547 ifdef CONFIG_DEBUG_INFO
549 KBUILD_AFLAGS += -gdwarf-2
552 ifdef CONFIG_FUNCTION_TRACER
556 # We trigger additional mismatches with less inlining
557 ifdef CONFIG_DEBUG_SECTION_MISMATCH
558 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
561 # arch Makefile may override CC so keep this after arch Makefile is included
562 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
563 CHECKFLAGS += $(NOSTDINC_FLAGS)
565 # warn about C99 declaration after statement
566 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
568 # disable pointer signed / unsigned warnings in gcc 4.0
569 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
571 # disable invalid "can't wrap" optimizations for signed / pointers
572 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
574 # revert to pre-gcc-4.4 behaviour of .eh_frame
575 KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
577 # conserve stack if available
578 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
580 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
581 # But warn user when we do so
583 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
585 ifneq ($(KCPPFLAGS),)
586 $(call warn-assign,CPPFLAGS)
587 KBUILD_CPPFLAGS += $(KCPPFLAGS)
590 $(call warn-assign,AFLAGS)
591 KBUILD_AFLAGS += $(KAFLAGS)
594 $(call warn-assign,CFLAGS)
595 KBUILD_CFLAGS += $(KCFLAGS)
598 # Use --build-id when available.
599 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
600 $(call cc-ldoption, -Wl$(comma)--build-id,))
601 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
602 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
604 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
605 LDFLAGS_vmlinux += $(call ld-option, -X,)
608 # Default kernel image to build when no specific target is given.
609 # KBUILD_IMAGE may be overruled on the command line or
610 # set in the environment
611 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
613 export KBUILD_IMAGE ?= vmlinux
616 # INSTALL_PATH specifies where to place the updated kernel and system map
617 # images. Default is /boot, but you can set it to other values
618 export INSTALL_PATH ?= /boot
621 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
622 # relocations required by build roots. This is not defined in the
623 # makefile but the argument can be passed to make if needed.
626 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
630 # INSTALL_MOD_STRIP, if defined, will cause modules to be
631 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
632 # the default option --strip-debug will be used. Otherwise,
633 # INSTALL_MOD_STRIP will used as the options to the strip command.
635 ifdef INSTALL_MOD_STRIP
636 ifeq ($(INSTALL_MOD_STRIP),1)
637 mod_strip_cmd = $(STRIP) --strip-debug
639 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
640 endif # INSTALL_MOD_STRIP=1
643 endif # INSTALL_MOD_STRIP
647 ifeq ($(KBUILD_EXTMOD),)
648 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
650 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
651 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
652 $(net-y) $(net-m) $(libs-y) $(libs-m)))
654 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
656 $(core-n) $(core-) $(drivers-n) $(drivers-) \
657 $(net-n) $(net-) $(libs-n) $(libs-))))
659 init-y := $(patsubst %/, %/built-in.o, $(init-y))
660 core-y := $(patsubst %/, %/built-in.o, $(core-y))
661 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
662 net-y := $(patsubst %/, %/built-in.o, $(net-y))
663 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
664 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
665 libs-y := $(libs-y1) $(libs-y2)
668 # ---------------------------------------------------------------------------
669 # vmlinux is built from the objects selected by $(vmlinux-init) and
670 # $(vmlinux-main). Most are built-in.o files from top-level directories
671 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
672 # Ordering when linking is important, and $(vmlinux-init) must be first.
677 # +-< $(vmlinux-init)
678 # | +--< init/version.o + more
680 # +--< $(vmlinux-main)
681 # | +--< driver/built-in.o mm/built-in.o + more
683 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
685 # vmlinux version (uname -v) cannot be updated during normal
686 # descending-into-subdirs phase since we do not yet know if we need to
688 # Therefore this step is delayed until just before final link of vmlinux -
689 # except in the kallsyms case where it is done just before adding the
690 # symbols to the kernel.
692 # System.map is generated to document addresses of all kernel symbols
694 vmlinux-init := $(head-y) $(init-y)
695 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
696 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
697 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
698 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
700 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
701 # May be overridden by arch/$(ARCH)/Makefile
702 quiet_cmd_vmlinux__ ?= LD $@
703 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
704 -T $(vmlinux-lds) $(vmlinux-init) \
705 --start-group $(vmlinux-main) --end-group \
706 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
708 # Generate new vmlinux version
709 quiet_cmd_vmlinux_version = GEN .version
710 cmd_vmlinux_version = set -e; \
711 if [ ! -r .version ]; then \
715 mv .version .old_version; \
716 expr 0$$(cat .old_version) + 1 >.version; \
718 $(MAKE) $(build)=init
720 # Generate System.map
721 quiet_cmd_sysmap = SYSMAP
722 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
725 # If CONFIG_KALLSYMS is set .version is already updated
726 # Generate System.map and verify that the content is consistent
727 # Use + in front of the vmlinux_version rule to silent warning with make -j2
728 # First command is ':' to allow us to use + in front of the rule
729 define rule_vmlinux__
731 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
733 $(call cmd,vmlinux__)
734 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
736 $(Q)$(if $($(quiet)cmd_sysmap), \
737 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
738 $(cmd_sysmap) $@ System.map; \
739 if [ $$? -ne 0 ]; then \
747 ifdef CONFIG_KALLSYMS
748 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
749 # It's a three stage process:
750 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
752 # Running kallsyms on that gives us .tmp_kallsyms1.o with
753 # the right size - vmlinux version (uname -v) is updated during this step
754 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
755 # but due to the added section, some addresses have shifted.
756 # From here, we generate a correct .tmp_kallsyms2.o
757 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
758 # o Verify that the System.map from vmlinux matches the map from
759 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
760 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
761 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
762 # temporary bypass to allow the kernel to be built while the
763 # maintainers work out what went wrong with kallsyms.
765 ifdef CONFIG_KALLSYMS_EXTRA_PASS
771 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
773 define verify_kallsyms
774 $(Q)$(if $($(quiet)cmd_sysmap), \
775 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
776 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
777 $(Q)cmp -s System.map .tmp_System.map || \
778 (echo Inconsistent kallsyms data; \
779 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
780 rm .tmp_kallsyms* ; /bin/false )
783 # Update vmlinux version before link
784 # Use + in front of this rule to silent warning about make -j1
785 # First command is ':' to allow us to use + in front of this rule
786 cmd_ksym_ld = $(cmd_vmlinux__)
789 +$(call cmd,vmlinux_version)
790 $(call cmd,vmlinux__)
791 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
794 # Generate .S file with all kernel symbols
795 quiet_cmd_kallsyms = KSYM $@
796 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
797 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
799 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
800 $(call if_changed_dep,as_o_S)
802 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
805 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
806 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
807 $(call if_changed_rule,ksym_ld)
809 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
810 $(call if_changed,vmlinux__)
812 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
813 $(call if_changed,vmlinux__)
815 # Needs to visit scripts/ before $(KALLSYMS) can be used.
816 $(KALLSYMS): scripts ;
818 # Generate some data for debugging strange kallsyms problems
819 debug_kallsyms: .tmp_map$(last_kallsyms)
821 .tmp_map%: .tmp_vmlinux% FORCE
822 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
828 endif # ifdef CONFIG_KALLSYMS
830 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
831 # relevant sections renamed as per the linker script.
832 quiet_cmd_vmlinux-modpost = LD $@
833 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
834 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
835 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
836 define rule_vmlinux-modpost
838 +$(call cmd,vmlinux-modpost)
839 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
840 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
843 # vmlinux image - including updated kernel symbols
844 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
845 ifdef CONFIG_HEADERS_CHECK
846 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
849 $(Q)$(MAKE) $(build)=samples
851 ifdef CONFIG_BUILD_DOCSRC
852 $(Q)$(MAKE) $(build)=Documentation
854 $(call vmlinux-modpost)
855 $(call if_changed_rule,vmlinux__)
856 $(Q)rm -f .old_version
858 # build vmlinux.o first to catch section mismatch errors early
859 ifdef CONFIG_KALLSYMS
860 .tmp_vmlinux1: vmlinux.o
863 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
864 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
865 $(call if_changed_rule,vmlinux-modpost)
867 # The actual objects are generated when descending,
868 # make sure no implicit rule kicks in
869 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
871 # Handle descending into subdirectories listed in $(vmlinux-dirs)
872 # Preset locale variables to speed up the build process. Limit locale
873 # tweaks to this spot to avoid wrong language settings when running
874 # make menuconfig etc.
875 # Error messages still appears in the original language
877 PHONY += $(vmlinux-dirs)
878 $(vmlinux-dirs): prepare scripts
879 $(Q)$(MAKE) $(build)=$@
881 # Build the kernel release string
883 # The KERNELRELEASE value built here is stored in the file
884 # include/config/kernel.release, and is used when executing several
885 # make targets, such as "make install" or "make modules_install."
887 # The eventual kernel release string consists of the following fields,
888 # shown in a hierarchical format to show how smaller parts are concatenated
889 # to form the larger and final value, with values coming from places like
890 # the Makefile, kernel config options, make command line options and/or
891 # SCM tag information.
895 # $(PATCHLEVEL) eg, 6
897 # $(EXTRAVERSION) eg, -rc6
900 # localversion* (files without backups, containing '~')
901 # $(CONFIG_LOCALVERSION) (from kernel config setting)
902 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
903 # ./scripts/setlocalversion (SCM tag, if one exists)
904 # $(LOCALVERSION) (from make command line if provided)
906 # Note how the final $(localver-auto) string is included *only* if the
907 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
908 # moment, only git is supported but other SCMs can edit the script
909 # scripts/setlocalversion and add the appropriate checks as needed.
911 pattern = ".*/localversion[^~]*"
912 string = $(shell cat /dev/null \
913 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
915 localver = $(subst $(space),, $(string) \
916 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
918 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
919 # and if the SCM is know a tag from the SCM is appended.
920 # The appended tag is determined by the SCM used.
922 # .scmversion is used when generating rpm packages so we do not loose
923 # the version information from the SCM when we do the build of the kernel
924 # from the copied source
925 ifdef CONFIG_LOCALVERSION_AUTO
927 ifeq ($(wildcard .scmversion),)
928 _localver-auto = $(shell $(CONFIG_SHELL) \
929 $(srctree)/scripts/setlocalversion $(srctree))
931 _localver-auto = $(shell cat .scmversion 2> /dev/null)
934 localver-auto = $(LOCALVERSION)$(_localver-auto)
937 localver-full = $(localver)$(localver-auto)
939 # Store (new) KERNELRELASE string in include/config/kernel.release
940 kernelrelease = $(KERNELVERSION)$(localver-full)
941 include/config/kernel.release: include/config/auto.conf FORCE
943 $(Q)echo $(kernelrelease) > $@
946 # Things we need to do before we recursively start building the kernel
947 # or the modules are listed in "prepare".
948 # A multi level approach is used. prepareN is processed before prepareN-1.
949 # archprepare is used in arch Makefiles and when processed asm symlink,
950 # version.h and scripts_basic is processed / created.
952 # Listed in dependency order
953 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
955 # prepare3 is used to check if we are building in a separate output directory,
957 # 1) Check that make has not been executed in the kernel src $(srctree)
958 # 2) Create the include2 directory, used for the second asm symlink
959 prepare3: include/config/kernel.release
960 ifneq ($(KBUILD_SRC),)
961 @$(kecho) ' Using $(srctree) as source for kernel'
962 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
963 echo " $(srctree) is not clean, please run 'make mrproper'";\
964 echo " in the '$(srctree)' directory.";\
967 $(Q)if [ ! -d include2 ]; then \
969 ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
973 # prepare2 creates a makefile if using a separate output directory
974 prepare2: prepare3 outputmakefile
976 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
977 include/asm include/config/auto.conf
980 archprepare: prepare1 scripts_basic
982 prepare0: archprepare FORCE
983 $(Q)$(MAKE) $(build)=.
984 $(Q)$(MAKE) $(build)=. missing-syscalls
986 # All the preparing..
989 # The asm symlink changes when $(ARCH) changes.
990 # Detect this and ask user to run make mrproper
991 # If asm is a stale symlink (point to dir that does not exist) remove it
994 if [ -L include/asm ]; then \
995 asmlink=`readlink include/asm | cut -d '-' -f 2`; \
996 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
997 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
998 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
1001 test -e $$asmlink || rm include/asm; \
1002 elif [ -d include/asm ]; then \
1003 echo "ERROR: $@ is a directory but a symlink was expected";\
1008 # We create the target directory of the symlink if it does
1009 # not exist so the test in check-symlink works and we have a
1010 # directory for generated filesas used by some architectures.
1011 define create-symlink
1012 if [ ! -L include/asm ]; then \
1013 $(kecho) ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1014 if [ ! -d include/asm-$(SRCARCH) ]; then \
1015 mkdir -p include/asm-$(SRCARCH); \
1017 ln -fsn asm-$(SRCARCH) $@; \
1022 $(Q)$(check-symlink)
1023 $(Q)$(create-symlink)
1025 # Generate some files
1026 # ---------------------------------------------------------------------------
1028 # KERNELRELEASE can change from a few different places, meaning version.h
1029 # needs to be updated, so this check is forced on all builds
1032 define filechk_utsrelease.h
1033 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1034 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1037 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1040 define filechk_version.h
1041 (echo \#define LINUX_VERSION_CODE $(shell \
1042 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1043 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1046 include/linux/version.h: $(srctree)/Makefile FORCE
1047 $(call filechk,version.h)
1049 include/linux/utsrelease.h: include/config/kernel.release FORCE
1050 $(call filechk,utsrelease.h)
1054 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1056 # ---------------------------------------------------------------------------
1060 @echo '*** Warning: make $@ is unnecessary now.'
1062 # ---------------------------------------------------------------------------
1064 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1065 export INSTALL_FW_PATH
1067 PHONY += firmware_install
1068 firmware_install: FORCE
1069 @mkdir -p $(objtree)/firmware
1070 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1072 # ---------------------------------------------------------------------------
1075 #Default location for installed headers
1076 export INSTALL_HDR_PATH = $(objtree)/usr
1078 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1079 # Find out where the Kbuild file is located to support
1080 # arch/$(ARCH)/include/asm
1082 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1083 arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1085 # If we do an all arch process set dst to asm-$(hdr-arch)
1086 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1089 __headers: include/linux/version.h scripts_basic FORCE
1090 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1092 PHONY += headers_install_all
1093 headers_install_all:
1094 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1096 PHONY += headers_install
1097 headers_install: __headers
1098 $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1099 $(error Headers not exportable for the $(SRCARCH) architecture))
1100 $(Q)$(MAKE) $(hdr-inst)=include
1101 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1103 PHONY += headers_check_all
1104 headers_check_all: headers_install_all
1105 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1107 PHONY += headers_check
1108 headers_check: headers_install
1109 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1110 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1112 # ---------------------------------------------------------------------------
1115 ifdef CONFIG_MODULES
1117 # By default, build modules as well
1123 # A module can be listed more than once in obj-m resulting in
1124 # duplicate lines in modules.order files. Those are removed
1125 # using awk while concatenating to the final file.
1128 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1129 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1130 @$(kecho) ' Building modules, stage 2.';
1131 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1132 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1135 # Target to prepare building external modules
1136 PHONY += modules_prepare
1137 modules_prepare: prepare scripts
1139 # Target to install modules
1140 PHONY += modules_install
1141 modules_install: _modinst_ _modinst_post
1145 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1146 echo "Warning: you may need to install module-init-tools"; \
1147 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1150 @rm -rf $(MODLIB)/kernel
1151 @rm -f $(MODLIB)/source
1152 @mkdir -p $(MODLIB)/kernel
1153 @ln -s $(srctree) $(MODLIB)/source
1154 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1155 rm -f $(MODLIB)/build ; \
1156 ln -s $(objtree) $(MODLIB)/build ; \
1158 @cp -f $(objtree)/modules.order $(MODLIB)/
1159 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1161 # This depmod is only for convenience to give the initial
1162 # boot a modules.dep even before / is mounted read-write. However the
1163 # boot script depmod is the master version.
1164 PHONY += _modinst_post
1165 _modinst_post: _modinst_
1166 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1169 else # CONFIG_MODULES
1171 # Modules not configured
1172 # ---------------------------------------------------------------------------
1174 modules modules_install: FORCE
1176 @echo "The present kernel configuration has modules disabled."
1177 @echo "Type 'make config' and enable loadable module support."
1178 @echo "Then build a kernel with module support enabled."
1182 endif # CONFIG_MODULES
1185 # Cleaning is done on three levels.
1186 # make clean Delete most generated files
1187 # Leave enough to build external modules
1188 # make mrproper Delete the current configuration, and all generated files
1189 # make distclean Remove editor backup files, patch leftover files and the like
1191 # Directories & files removed with 'make clean'
1192 CLEAN_DIRS += $(MODVERDIR)
1193 CLEAN_FILES += vmlinux System.map \
1194 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1196 # Directories & files removed with 'make mrproper'
1197 MRPROPER_DIRS += include/config include2 usr/include include/generated
1198 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1199 include/linux/autoconf.h include/linux/version.h \
1200 include/linux/utsrelease.h \
1201 include/linux/bounds.h include/asm*/asm-offsets.h \
1202 Module.symvers Module.markers tags TAGS cscope*
1204 # clean - Delete most, but leave enough to build external modules
1206 clean: rm-dirs := $(CLEAN_DIRS)
1207 clean: rm-files := $(CLEAN_FILES)
1208 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1210 PHONY += $(clean-dirs) clean archclean
1212 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1214 clean: archclean $(clean-dirs)
1217 @find . $(RCS_FIND_IGNORE) \
1218 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1219 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1220 -o -name '*.symtypes' -o -name 'modules.order' \
1221 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1222 -o -name '*.gcno' \) -type f -print | xargs rm -f
1224 # mrproper - Delete all generated files, including .config
1226 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1227 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1228 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1230 PHONY += $(mrproper-dirs) mrproper archmrproper
1232 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1234 mrproper: clean archmrproper $(mrproper-dirs)
1243 @find $(srctree) $(RCS_FIND_IGNORE) \
1244 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1245 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1246 -o -name '.*.rej' -o -size 0 \
1247 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1248 -type f -print | xargs rm -f
1251 # Packaging of the kernel to various formats
1252 # ---------------------------------------------------------------------------
1253 # rpm target kept for backward compatibility
1254 package-dir := $(srctree)/scripts/package
1256 %pkg: include/config/kernel.release FORCE
1257 $(Q)$(MAKE) $(build)=$(package-dir) $@
1258 rpm: include/config/kernel.release FORCE
1259 $(Q)$(MAKE) $(build)=$(package-dir) $@
1262 # Brief documentation of the typical targets used
1263 # ---------------------------------------------------------------------------
1265 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1266 boards := $(notdir $(boards))
1267 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1268 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1271 @echo 'Cleaning targets:'
1272 @echo ' clean - Remove most generated files but keep the config and'
1273 @echo ' enough build support to build external modules'
1274 @echo ' mrproper - Remove all generated files + config + various backup files'
1275 @echo ' distclean - mrproper + remove editor backup and patch files'
1277 @echo 'Configuration targets:'
1278 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1280 @echo 'Other generic targets:'
1281 @echo ' all - Build all targets marked with [*]'
1282 @echo '* vmlinux - Build the bare kernel'
1283 @echo '* modules - Build all modules'
1284 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1285 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1286 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1287 @echo ' dir/ - Build all files in dir and below'
1288 @echo ' dir/file.[ois] - Build specified target only'
1289 @echo ' dir/file.ko - Build module including final link'
1290 @echo ' modules_prepare - Set up for building external modules'
1291 @echo ' tags/TAGS - Generate tags file for editors'
1292 @echo ' cscope - Generate cscope index'
1293 @echo ' kernelrelease - Output the release version string'
1294 @echo ' kernelversion - Output the version stored in Makefile'
1295 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1296 echo ' (default: $(INSTALL_HDR_PATH))'; \
1298 @echo 'Static analysers'
1299 @echo ' checkstack - Generate a list of stack hogs'
1300 @echo ' namespacecheck - Name space analysis on compiled kernel'
1301 @echo ' versioncheck - Sanity check on version.h usage'
1302 @echo ' includecheck - Check for duplicate included header files'
1303 @echo ' export_report - List the usages of all exported symbols'
1304 @echo ' headers_check - Sanity check on exported headers'
1305 @echo ' headerdep - Detect inclusion cycles in headers'; \
1307 @echo 'Kernel packaging:'
1308 @$(MAKE) $(build)=$(package-dir) help
1310 @echo 'Documentation targets:'
1311 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1313 @echo 'Architecture specific targets ($(SRCARCH)):'
1314 @$(if $(archhelp),$(archhelp),\
1315 echo ' No architecture specific help defined for $(SRCARCH)')
1318 $(foreach b, $(boards), \
1319 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1321 @$(if $(board-dirs), \
1322 $(foreach b, $(board-dirs), \
1323 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1324 printf " %-16s - Show all of the above\\n" help-boards; \
1327 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1328 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1329 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1330 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1331 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1333 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1334 @echo 'For further info see the ./README file'
1337 help-board-dirs := $(addprefix help-,$(board-dirs))
1339 help-boards: $(help-board-dirs)
1341 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1343 $(help-board-dirs): help-%:
1344 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1345 @$(if $(boards-per-dir), \
1346 $(foreach b, $(boards-per-dir), \
1347 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1351 # Documentation targets
1352 # ---------------------------------------------------------------------------
1353 %docs: scripts_basic FORCE
1354 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1356 else # KBUILD_EXTMOD
1359 # External module support.
1360 # When building external modules the kernel used as basis is considered
1361 # read-only, and no consistency checks are made and the make
1362 # system is not used on the basis kernel. If updates are required
1363 # in the basis kernel ordinary make commands (without M=...) must
1366 # The following are the only valid targets when building external
1368 # make M=dir clean Delete all automatically generated files
1369 # make M=dir modules Make all modules in specified dir
1370 # make M=dir Same as 'make M=dir modules'
1371 # make M=dir modules_install
1372 # Install the modules built in the module directory
1373 # Assumes install directory is already created
1375 # We are always building modules
1377 PHONY += crmodverdir
1381 PHONY += $(objtree)/Module.symvers
1382 $(objtree)/Module.symvers:
1383 @test -e $(objtree)/Module.symvers || ( \
1385 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1386 echo " is missing; modules will have no dependencies and modversions."; \
1389 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1390 PHONY += $(module-dirs) modules
1391 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1392 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1394 modules: $(module-dirs)
1395 @$(kecho) ' Building modules, stage 2.';
1396 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1398 PHONY += modules_install
1399 modules_install: _emodinst_ _emodinst_post
1401 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1404 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1405 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1407 PHONY += _emodinst_post
1408 _emodinst_post: _emodinst_
1411 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1413 PHONY += $(clean-dirs) clean
1415 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1417 clean: rm-dirs := $(MODVERDIR)
1418 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1419 $(KBUILD_EXTMOD)/Module.markers \
1420 $(KBUILD_EXTMOD)/modules.order
1421 clean: $(clean-dirs)
1424 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1425 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1426 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1427 -o -name '*.gcno' \) -type f -print | xargs rm -f
1430 @echo ' Building external modules.'
1431 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1433 @echo ' modules - default target, build the module(s)'
1434 @echo ' modules_install - install the module'
1435 @echo ' clean - remove generated files in module directory only'
1439 PHONY += prepare scripts
1442 endif # KBUILD_EXTMOD
1444 # Generate tags for editors
1445 # ---------------------------------------------------------------------------
1446 quiet_cmd_tags = GEN $@
1447 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1449 tags TAGS cscope: FORCE
1452 # Scripts to check various things for consistency
1453 # ---------------------------------------------------------------------------
1456 find * $(RCS_FIND_IGNORE) \
1457 -name '*.[hcS]' -type f -print | sort \
1458 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1461 find * $(RCS_FIND_IGNORE) \
1462 -name '*.[hcS]' -type f -print | sort \
1463 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1466 $(PERL) $(srctree)/scripts/namespace.pl
1469 $(PERL) $(srctree)/scripts/export_report.pl
1471 endif #ifeq ($(config-targets),1)
1472 endif #ifeq ($(mixed-targets),1)
1474 PHONY += checkstack kernelrelease kernelversion
1476 # UML needs a little special treatment here. It wants to use the host
1477 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1478 # else wants $(ARCH), including people doing cross-builds, which means
1479 # that $(SUBARCH) doesn't work here.
1481 CHECKSTACK_ARCH := $(SUBARCH)
1483 CHECKSTACK_ARCH := $(ARCH)
1486 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1487 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1490 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1491 $(error kernelrelease not valid - run 'make prepare' to update it))
1493 @echo $(KERNELVERSION)
1496 # ---------------------------------------------------------------------------
1497 # Single targets are compatible with:
1498 # - build with mixed source and output
1499 # - build with separate output dir 'make O=...'
1500 # - external modules
1502 # target-dir => where to store outputfile
1503 # build-dir => directory in kernel source tree to use
1505 ifeq ($(KBUILD_EXTMOD),)
1506 build-dir = $(patsubst %/,%,$(dir $@))
1507 target-dir = $(dir $@)
1509 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1510 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1511 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1514 %.s: %.c prepare scripts FORCE
1515 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1516 %.i: %.c prepare scripts FORCE
1517 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1518 %.o: %.c prepare scripts FORCE
1519 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1520 %.lst: %.c prepare scripts FORCE
1521 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522 %.s: %.S prepare scripts FORCE
1523 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.o: %.S prepare scripts FORCE
1525 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.symtypes: %.c prepare scripts FORCE
1527 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530 /: prepare scripts FORCE
1532 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1533 $(build)=$(build-dir)
1534 %/: prepare scripts FORCE
1536 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1537 $(build)=$(build-dir)
1538 %.ko: prepare scripts FORCE
1540 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1541 $(build)=$(build-dir) $(@:.ko=.o)
1542 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1544 # FIXME Should go into a make.lib or something
1545 # ===========================================================================
1547 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1548 cmd_rmdirs = rm -rf $(rm-dirs)
1550 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1551 cmd_rmfiles = rm -f $(rm-files)
1553 # Run depmod only if we have System.map and depmod is executable
1554 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1556 if [ -r System.map -a -x $(DEPMOD) ]; then \
1557 $(DEPMOD) -ae -F System.map \
1558 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1562 # Create temporary dir for module support files
1563 # clean it up only when building all modules
1564 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1565 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1567 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1568 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1569 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1571 quiet_cmd_as_o_S = AS $@
1572 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1574 # read all saved command lines
1576 targets := $(wildcard $(sort $(targets)))
1577 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1579 ifneq ($(cmd_files),)
1580 $(cmd_files): ; # Do not try to update included dependency files
1581 include $(cmd_files)
1584 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1586 # $(Q)$(MAKE) $(clean)=dir
1587 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1589 endif # skip-makefile
1594 # Declare the contents of the .PHONY variable as phony. We keep that
1595 # information in a variable so we can use it in if_changed and friends.