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 := $(SUBARCH)
186 ifneq ($(wildcard ../toolchain/arm-eabi-4.4.0),)
187 CROSS_COMPILE ?= ../toolchain/arm-eabi-4.4.0/bin/arm-eabi-
189 ifneq ($(wildcard ../prebuilt/linux-x86/toolchain/arm-eabi-4.4.0),)
190 CROSS_COMPILE ?= ../prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi-
193 # Architecture as present in compile.h
194 UTS_MACHINE := $(ARCH)
197 # Additional ARCH settings for x86
201 ifeq ($(ARCH),x86_64)
205 # Additional ARCH settings for sparc
206 ifeq ($(ARCH),sparc64)
210 # Additional ARCH settings for sh
215 # Where to locate arch specific headers
216 hdr-arch := $(SRCARCH)
218 ifeq ($(ARCH),m68knommu)
222 KCONFIG_CONFIG ?= .config
224 # SHELL used by kbuild
225 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
226 else if [ -x /bin/bash ]; then echo /bin/bash; \
227 else echo sh; fi ; fi)
231 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
234 # Decide whether to build built-in, modular, or both.
235 # Normally, just do built-in.
240 # If we have only "make modules", don't compile built-in objects.
241 # When we're building modules with modversions, we need to consider
242 # the built-in objects during the descend as well, in order to
243 # make sure the checksums are up to date before we record them.
245 ifeq ($(MAKECMDGOALS),modules)
246 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
249 # If we have "make <whatever> modules", compile modules
250 # in addition to whatever we do anyway.
251 # Just "make" or "make all" shall build modules as well
253 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
257 ifeq ($(MAKECMDGOALS),)
261 export KBUILD_MODULES KBUILD_BUILTIN
262 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
265 # ---------------------------------------------------------------------------
267 # Normally, we echo the whole command before executing it. By making
268 # that echo $($(quiet)$(cmd)), we now have the possibility to set
269 # $(quiet) to choose other forms of output instead, e.g.
271 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
272 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
274 # If $(quiet) is empty, the whole command will be printed.
275 # If it is set to "quiet_", only the short version will be printed.
276 # If it is set to "silent_", nothing will be printed at all, since
277 # the variable $(silent_cmd_cc_o_c) doesn't exist.
279 # A simple variant is to prefix commands with $(Q) - that's useful
280 # for commands that shall be hidden in non-verbose mode.
284 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
285 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
287 ifeq ($(KBUILD_VERBOSE),1)
295 # If the user is running make -s (silent mode), suppress echoing of
298 ifneq ($(findstring s,$(MAKEFLAGS)),)
302 export quiet Q KBUILD_VERBOSE
305 # Look for make include files relative to root of kernel src
306 MAKEFLAGS += --include-dir=$(srctree)
308 # We need some generic definitions (do not try to remake the file).
309 $(srctree)/scripts/Kbuild.include: ;
310 include $(srctree)/scripts/Kbuild.include
312 # Make variables (CC, etc...)
314 AS = $(CROSS_COMPILE)as
315 LD = $(CROSS_COMPILE)ld
316 CC = $(CROSS_COMPILE)gcc
318 AR = $(CROSS_COMPILE)ar
319 NM = $(CROSS_COMPILE)nm
320 STRIP = $(CROSS_COMPILE)strip
321 OBJCOPY = $(CROSS_COMPILE)objcopy
322 OBJDUMP = $(CROSS_COMPILE)objdump
324 GENKSYMS = scripts/genksyms/genksyms
325 INSTALLKERNEL := installkernel
326 DEPMOD = /sbin/depmod
327 KALLSYMS = scripts/kallsyms
331 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
332 -Wbitwise -Wno-return-void $(CF)
334 CFLAGS_MODULE = $(MODFLAGS)
335 AFLAGS_MODULE = $(MODFLAGS)
336 LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds
339 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
342 # Use LINUXINCLUDE when you must reference the include/ directory.
343 # Needed to be compatible with the O= option
344 LINUXINCLUDE := -Iinclude \
345 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
346 -I$(srctree)/arch/$(hdr-arch)/include \
347 -include include/linux/autoconf.h
349 KBUILD_CPPFLAGS := -D__KERNEL__
351 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
352 -fno-strict-aliasing -fno-common \
353 -Werror-implicit-function-declaration \
354 -Wno-format-security \
355 -fno-delete-null-pointer-checks
356 KBUILD_AFLAGS := -D__ASSEMBLY__
358 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
359 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
360 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
362 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
363 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
364 export CPP AR NM STRIP OBJCOPY OBJDUMP
365 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
366 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
368 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
369 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
370 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
372 # When compiling out-of-tree modules, put MODVERDIR in the module
373 # tree rather than in the kernel tree. The kernel tree might
375 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
377 # Files to ignore in find ... statements
379 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
380 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
382 # ===========================================================================
383 # Rules shared between *config targets and build targets
385 # Basic helpers built in scripts/
386 PHONY += scripts_basic
388 $(Q)$(MAKE) $(build)=scripts/basic
390 # To avoid any implicit rule to kick in, define an empty command.
391 scripts/basic/%: scripts_basic ;
393 PHONY += outputmakefile
394 # outputmakefile generates a Makefile in the output directory, if using a
395 # separate output directory. This allows convenient use of make in the
398 ifneq ($(KBUILD_SRC),)
399 $(Q)ln -fsn $(srctree) source
400 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
401 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
404 # To make sure we do not include .config for any of the *config targets
405 # catch them early, and hand them over to scripts/kconfig/Makefile
406 # It is allowed to specify more targets when calling make, including
407 # mixing *config targets and build targets.
408 # For example 'make oldconfig all'.
409 # Detect when mixed targets is specified, and make a second invocation
410 # of make so .config is not included in this case either (for *config).
412 no-dot-config-targets := clean mrproper distclean \
413 cscope TAGS tags help %docs check% \
414 include/linux/version.h headers_% \
415 kernelrelease kernelversion
421 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
422 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
427 ifeq ($(KBUILD_EXTMOD),)
428 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
430 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
436 ifeq ($(mixed-targets),1)
437 # ===========================================================================
438 # We're called with mixed targets (*config and build targets).
439 # Handle them one by one.
442 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
445 ifeq ($(config-targets),1)
446 # ===========================================================================
447 # *config targets only - make sure prerequisites are updated, and descend
448 # in scripts/kconfig to make the *config target
450 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
451 # KBUILD_DEFCONFIG may point out an alternative default configuration
452 # used for 'make defconfig'
453 include $(srctree)/arch/$(SRCARCH)/Makefile
454 export KBUILD_DEFCONFIG KBUILD_KCONFIG
456 config: scripts_basic outputmakefile FORCE
457 $(Q)mkdir -p include/linux include/config
458 $(Q)$(MAKE) $(build)=scripts/kconfig $@
460 %config: scripts_basic outputmakefile FORCE
461 $(Q)mkdir -p include/linux include/config
462 $(Q)$(MAKE) $(build)=scripts/kconfig $@
465 # ===========================================================================
466 # Build targets only - this includes vmlinux, arch specific targets, clean
467 # targets and others. In general all targets except *config targets.
469 ifeq ($(KBUILD_EXTMOD),)
470 # Additional helpers built in scripts/
471 # Carefully list dependencies so we do not try to build scripts twice
474 scripts: scripts_basic include/config/auto.conf
475 $(Q)$(MAKE) $(build)=$(@)
477 # Objects we will link into vmlinux / subdirs we need to visit
479 drivers-y := drivers/ sound/ firmware/
483 endif # KBUILD_EXTMOD
485 ifeq ($(dot-config),1)
487 -include include/config/auto.conf
489 ifeq ($(KBUILD_EXTMOD),)
490 # Read in dependencies to all Kconfig* files, make sure to run
491 # oldconfig if changes are detected.
492 -include include/config/auto.conf.cmd
494 # To avoid any implicit rule to kick in, define an empty command
495 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
497 # If .config is newer than include/config/auto.conf, someone tinkered
498 # with it and forgot to run make oldconfig.
499 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
500 # we execute the config step to be sure to catch updated Kconfig files
501 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
502 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
504 # external modules needs include/linux/autoconf.h and include/config/auto.conf
505 # but do not care if they are up-to-date. Use auto.conf to trigger the test
506 PHONY += include/config/auto.conf
508 include/config/auto.conf:
509 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
511 echo " ERROR: Kernel configuration is invalid."; \
512 echo " include/linux/autoconf.h or $@ are missing."; \
513 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
517 endif # KBUILD_EXTMOD
520 # Dummy target needed, because used as prerequisite
521 include/config/auto.conf: ;
522 endif # $(dot-config)
524 # The all: target is the default when no target is given on the
526 # This allow a user to issue only 'make' to build a kernel including modules
527 # Defaults vmlinux but it is usually overridden in the arch makefile
530 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
536 include $(srctree)/arch/$(SRCARCH)/Makefile
538 ifneq ($(CONFIG_FRAME_WARN),0)
539 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
542 # Force gcc to behave correct even for buggy distributions
543 ifndef CONFIG_CC_STACKPROTECTOR
544 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
547 ifdef CONFIG_FRAME_POINTER
548 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
550 KBUILD_CFLAGS += -fomit-frame-pointer
553 ifdef CONFIG_DEBUG_INFO
555 KBUILD_AFLAGS += -gdwarf-2
558 ifdef CONFIG_FUNCTION_TRACER
562 # We trigger additional mismatches with less inlining
563 ifdef CONFIG_DEBUG_SECTION_MISMATCH
564 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
567 # arch Makefile may override CC so keep this after arch Makefile is included
568 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
569 CHECKFLAGS += $(NOSTDINC_FLAGS)
571 # warn about C99 declaration after statement
572 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
574 # disable pointer signed / unsigned warnings in gcc 4.0
575 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
577 # disable invalid "can't wrap" optimizations for signed / pointers
578 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
580 # revert to pre-gcc-4.4 behaviour of .eh_frame
581 KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
583 # conserve stack if available
584 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
586 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
587 # But warn user when we do so
589 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
591 ifneq ($(KCPPFLAGS),)
592 $(call warn-assign,CPPFLAGS)
593 KBUILD_CPPFLAGS += $(KCPPFLAGS)
596 $(call warn-assign,AFLAGS)
597 KBUILD_AFLAGS += $(KAFLAGS)
600 $(call warn-assign,CFLAGS)
601 KBUILD_CFLAGS += $(KCFLAGS)
604 # Use --build-id when available.
605 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
606 $(call cc-ldoption, -Wl$(comma)--build-id,))
607 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
608 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
610 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
611 LDFLAGS_vmlinux += $(call ld-option, -X,)
614 # Default kernel image to build when no specific target is given.
615 # KBUILD_IMAGE may be overruled on the command line or
616 # set in the environment
617 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
619 export KBUILD_IMAGE ?= vmlinux
622 # INSTALL_PATH specifies where to place the updated kernel and system map
623 # images. Default is /boot, but you can set it to other values
624 export INSTALL_PATH ?= /boot
627 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
628 # relocations required by build roots. This is not defined in the
629 # makefile but the argument can be passed to make if needed.
632 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
636 # INSTALL_MOD_STRIP, if defined, will cause modules to be
637 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
638 # the default option --strip-debug will be used. Otherwise,
639 # INSTALL_MOD_STRIP will used as the options to the strip command.
641 ifdef INSTALL_MOD_STRIP
642 ifeq ($(INSTALL_MOD_STRIP),1)
643 mod_strip_cmd = $(STRIP) --strip-debug
645 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
646 endif # INSTALL_MOD_STRIP=1
649 endif # INSTALL_MOD_STRIP
653 ifeq ($(KBUILD_EXTMOD),)
654 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
656 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
657 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
658 $(net-y) $(net-m) $(libs-y) $(libs-m)))
660 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
662 $(core-n) $(core-) $(drivers-n) $(drivers-) \
663 $(net-n) $(net-) $(libs-n) $(libs-))))
665 init-y := $(patsubst %/, %/built-in.o, $(init-y))
666 core-y := $(patsubst %/, %/built-in.o, $(core-y))
667 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
668 net-y := $(patsubst %/, %/built-in.o, $(net-y))
669 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
670 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
671 libs-y := $(libs-y1) $(libs-y2)
674 # ---------------------------------------------------------------------------
675 # vmlinux is built from the objects selected by $(vmlinux-init) and
676 # $(vmlinux-main). Most are built-in.o files from top-level directories
677 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
678 # Ordering when linking is important, and $(vmlinux-init) must be first.
683 # +-< $(vmlinux-init)
684 # | +--< init/version.o + more
686 # +--< $(vmlinux-main)
687 # | +--< driver/built-in.o mm/built-in.o + more
689 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
691 # vmlinux version (uname -v) cannot be updated during normal
692 # descending-into-subdirs phase since we do not yet know if we need to
694 # Therefore this step is delayed until just before final link of vmlinux -
695 # except in the kallsyms case where it is done just before adding the
696 # symbols to the kernel.
698 # System.map is generated to document addresses of all kernel symbols
700 vmlinux-init := $(head-y) $(init-y)
701 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
702 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
703 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
704 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
706 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
707 # May be overridden by arch/$(ARCH)/Makefile
708 quiet_cmd_vmlinux__ ?= LD $@
709 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
710 -T $(vmlinux-lds) $(vmlinux-init) \
711 --start-group $(vmlinux-main) --end-group \
712 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
714 # Generate new vmlinux version
715 quiet_cmd_vmlinux_version = GEN .version
716 cmd_vmlinux_version = set -e; \
717 if [ ! -r .version ]; then \
721 mv .version .old_version; \
722 expr 0$$(cat .old_version) + 1 >.version; \
724 $(MAKE) $(build)=init
726 # Generate System.map
727 quiet_cmd_sysmap = SYSMAP
728 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
731 # If CONFIG_KALLSYMS is set .version is already updated
732 # Generate System.map and verify that the content is consistent
733 # Use + in front of the vmlinux_version rule to silent warning with make -j2
734 # First command is ':' to allow us to use + in front of the rule
735 define rule_vmlinux__
737 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
739 $(call cmd,vmlinux__)
740 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
742 $(Q)$(if $($(quiet)cmd_sysmap), \
743 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
744 $(cmd_sysmap) $@ System.map; \
745 if [ $$? -ne 0 ]; then \
753 ifdef CONFIG_KALLSYMS
754 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
755 # It's a three stage process:
756 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
758 # Running kallsyms on that gives us .tmp_kallsyms1.o with
759 # the right size - vmlinux version (uname -v) is updated during this step
760 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
761 # but due to the added section, some addresses have shifted.
762 # From here, we generate a correct .tmp_kallsyms2.o
763 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
764 # o Verify that the System.map from vmlinux matches the map from
765 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
766 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
767 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
768 # temporary bypass to allow the kernel to be built while the
769 # maintainers work out what went wrong with kallsyms.
771 ifdef CONFIG_KALLSYMS_EXTRA_PASS
777 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
779 define verify_kallsyms
780 $(Q)$(if $($(quiet)cmd_sysmap), \
781 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
782 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
783 $(Q)cmp -s System.map .tmp_System.map || \
784 (echo Inconsistent kallsyms data; \
785 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
786 rm .tmp_kallsyms* ; /bin/false )
789 # Update vmlinux version before link
790 # Use + in front of this rule to silent warning about make -j1
791 # First command is ':' to allow us to use + in front of this rule
792 cmd_ksym_ld = $(cmd_vmlinux__)
795 +$(call cmd,vmlinux_version)
796 $(call cmd,vmlinux__)
797 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
800 # Generate .S file with all kernel symbols
801 quiet_cmd_kallsyms = KSYM $@
802 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
803 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
805 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
806 $(call if_changed_dep,as_o_S)
808 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
811 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
812 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
813 $(call if_changed_rule,ksym_ld)
815 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
816 $(call if_changed,vmlinux__)
818 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
819 $(call if_changed,vmlinux__)
821 # Needs to visit scripts/ before $(KALLSYMS) can be used.
822 $(KALLSYMS): scripts ;
824 # Generate some data for debugging strange kallsyms problems
825 debug_kallsyms: .tmp_map$(last_kallsyms)
827 .tmp_map%: .tmp_vmlinux% FORCE
828 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
834 endif # ifdef CONFIG_KALLSYMS
836 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
837 # relevant sections renamed as per the linker script.
838 quiet_cmd_vmlinux-modpost = LD $@
839 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
840 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
841 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
842 define rule_vmlinux-modpost
844 +$(call cmd,vmlinux-modpost)
845 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
846 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
849 # vmlinux image - including updated kernel symbols
850 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
851 ifdef CONFIG_HEADERS_CHECK
852 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
855 $(Q)$(MAKE) $(build)=samples
857 ifdef CONFIG_BUILD_DOCSRC
858 $(Q)$(MAKE) $(build)=Documentation
860 $(call vmlinux-modpost)
861 $(call if_changed_rule,vmlinux__)
862 $(Q)rm -f .old_version
864 # build vmlinux.o first to catch section mismatch errors early
865 ifdef CONFIG_KALLSYMS
866 .tmp_vmlinux1: vmlinux.o
869 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
870 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
871 $(call if_changed_rule,vmlinux-modpost)
873 # The actual objects are generated when descending,
874 # make sure no implicit rule kicks in
875 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
877 # Handle descending into subdirectories listed in $(vmlinux-dirs)
878 # Preset locale variables to speed up the build process. Limit locale
879 # tweaks to this spot to avoid wrong language settings when running
880 # make menuconfig etc.
881 # Error messages still appears in the original language
883 PHONY += $(vmlinux-dirs)
884 $(vmlinux-dirs): prepare scripts
885 $(Q)$(MAKE) $(build)=$@
887 # Build the kernel release string
889 # The KERNELRELEASE value built here is stored in the file
890 # include/config/kernel.release, and is used when executing several
891 # make targets, such as "make install" or "make modules_install."
893 # The eventual kernel release string consists of the following fields,
894 # shown in a hierarchical format to show how smaller parts are concatenated
895 # to form the larger and final value, with values coming from places like
896 # the Makefile, kernel config options, make command line options and/or
897 # SCM tag information.
901 # $(PATCHLEVEL) eg, 6
903 # $(EXTRAVERSION) eg, -rc6
906 # localversion* (files without backups, containing '~')
907 # $(CONFIG_LOCALVERSION) (from kernel config setting)
908 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
909 # ./scripts/setlocalversion (SCM tag, if one exists)
910 # $(LOCALVERSION) (from make command line if provided)
912 # Note how the final $(localver-auto) string is included *only* if the
913 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
914 # moment, only git is supported but other SCMs can edit the script
915 # scripts/setlocalversion and add the appropriate checks as needed.
917 pattern = ".*/localversion[^~]*"
918 string = $(shell cat /dev/null \
919 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
921 localver = $(subst $(space),, $(string) \
922 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
924 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
925 # and if the SCM is know a tag from the SCM is appended.
926 # The appended tag is determined by the SCM used.
928 # .scmversion is used when generating rpm packages so we do not loose
929 # the version information from the SCM when we do the build of the kernel
930 # from the copied source
931 ifdef CONFIG_LOCALVERSION_AUTO
933 ifeq ($(wildcard .scmversion),)
934 _localver-auto = $(shell $(CONFIG_SHELL) \
935 $(srctree)/scripts/setlocalversion $(srctree))
937 _localver-auto = $(shell cat .scmversion 2> /dev/null)
940 localver-auto = $(LOCALVERSION)$(_localver-auto)
943 localver-full = $(localver)$(localver-auto)
945 # Store (new) KERNELRELASE string in include/config/kernel.release
946 kernelrelease = $(KERNELVERSION)$(localver-full)
947 include/config/kernel.release: include/config/auto.conf FORCE
949 $(Q)echo $(kernelrelease) > $@
952 # Things we need to do before we recursively start building the kernel
953 # or the modules are listed in "prepare".
954 # A multi level approach is used. prepareN is processed before prepareN-1.
955 # archprepare is used in arch Makefiles and when processed asm symlink,
956 # version.h and scripts_basic is processed / created.
958 # Listed in dependency order
959 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
961 # prepare3 is used to check if we are building in a separate output directory,
963 # 1) Check that make has not been executed in the kernel src $(srctree)
964 # 2) Create the include2 directory, used for the second asm symlink
965 prepare3: include/config/kernel.release
966 ifneq ($(KBUILD_SRC),)
967 @$(kecho) ' Using $(srctree) as source for kernel'
968 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
969 echo " $(srctree) is not clean, please run 'make mrproper'";\
970 echo " in the '$(srctree)' directory.";\
973 $(Q)if [ ! -d include2 ]; then \
975 ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
979 # prepare2 creates a makefile if using a separate output directory
980 prepare2: prepare3 outputmakefile
982 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
983 include/asm include/config/auto.conf
986 archprepare: prepare1 scripts_basic
988 prepare0: archprepare FORCE
989 $(Q)$(MAKE) $(build)=.
990 $(Q)$(MAKE) $(build)=. missing-syscalls
992 # All the preparing..
995 # The asm symlink changes when $(ARCH) changes.
996 # Detect this and ask user to run make mrproper
997 # If asm is a stale symlink (point to dir that does not exist) remove it
1000 if [ -L include/asm ]; then \
1001 asmlink=`readlink include/asm | cut -d '-' -f 2`; \
1002 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
1003 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1004 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
1007 test -e $$asmlink || rm include/asm; \
1008 elif [ -d include/asm ]; then \
1009 echo "ERROR: $@ is a directory but a symlink was expected";\
1014 # We create the target directory of the symlink if it does
1015 # not exist so the test in check-symlink works and we have a
1016 # directory for generated filesas used by some architectures.
1017 define create-symlink
1018 if [ ! -L include/asm ]; then \
1019 $(kecho) ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1020 if [ ! -d include/asm-$(SRCARCH) ]; then \
1021 mkdir -p include/asm-$(SRCARCH); \
1023 ln -fsn asm-$(SRCARCH) $@; \
1028 $(Q)$(check-symlink)
1029 $(Q)$(create-symlink)
1031 # Generate some files
1032 # ---------------------------------------------------------------------------
1034 # KERNELRELEASE can change from a few different places, meaning version.h
1035 # needs to be updated, so this check is forced on all builds
1038 define filechk_utsrelease.h
1039 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1040 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1043 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1046 define filechk_version.h
1047 (echo \#define LINUX_VERSION_CODE $(shell \
1048 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1049 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1052 include/linux/version.h: $(srctree)/Makefile FORCE
1053 $(call filechk,version.h)
1055 include/linux/utsrelease.h: include/config/kernel.release FORCE
1056 $(call filechk,utsrelease.h)
1060 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1062 # ---------------------------------------------------------------------------
1066 @echo '*** Warning: make $@ is unnecessary now.'
1068 # ---------------------------------------------------------------------------
1070 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1071 export INSTALL_FW_PATH
1073 PHONY += firmware_install
1074 firmware_install: FORCE
1075 @mkdir -p $(objtree)/firmware
1076 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1078 # ---------------------------------------------------------------------------
1081 #Default location for installed headers
1082 export INSTALL_HDR_PATH = $(objtree)/usr
1084 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1085 # Find out where the Kbuild file is located to support
1086 # arch/$(ARCH)/include/asm
1088 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1089 arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1091 # If we do an all arch process set dst to asm-$(hdr-arch)
1092 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1095 __headers: include/linux/version.h scripts_basic FORCE
1096 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1098 PHONY += headers_install_all
1099 headers_install_all:
1100 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1102 PHONY += headers_install
1103 headers_install: __headers
1104 $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1105 $(error Headers not exportable for the $(SRCARCH) architecture))
1106 $(Q)$(MAKE) $(hdr-inst)=include
1107 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1109 PHONY += headers_check_all
1110 headers_check_all: headers_install_all
1111 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1113 PHONY += headers_check
1114 headers_check: headers_install
1115 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1116 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1118 # ---------------------------------------------------------------------------
1121 ifdef CONFIG_MODULES
1123 # By default, build modules as well
1129 # A module can be listed more than once in obj-m resulting in
1130 # duplicate lines in modules.order files. Those are removed
1131 # using awk while concatenating to the final file.
1134 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1135 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1136 @$(kecho) ' Building modules, stage 2.';
1137 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1138 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1141 # Target to prepare building external modules
1142 PHONY += modules_prepare
1143 modules_prepare: prepare scripts
1145 # Target to install modules
1146 PHONY += modules_install
1147 modules_install: _modinst_ _modinst_post
1151 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1152 echo "Warning: you may need to install module-init-tools"; \
1153 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1156 @rm -rf $(MODLIB)/kernel
1157 @rm -f $(MODLIB)/source
1158 @mkdir -p $(MODLIB)/kernel
1159 @ln -s $(srctree) $(MODLIB)/source
1160 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1161 rm -f $(MODLIB)/build ; \
1162 ln -s $(objtree) $(MODLIB)/build ; \
1164 @cp -f $(objtree)/modules.order $(MODLIB)/
1165 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1167 # This depmod is only for convenience to give the initial
1168 # boot a modules.dep even before / is mounted read-write. However the
1169 # boot script depmod is the master version.
1170 PHONY += _modinst_post
1171 _modinst_post: _modinst_
1172 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1175 else # CONFIG_MODULES
1177 # Modules not configured
1178 # ---------------------------------------------------------------------------
1180 modules modules_install: FORCE
1182 @echo "The present kernel configuration has modules disabled."
1183 @echo "Type 'make config' and enable loadable module support."
1184 @echo "Then build a kernel with module support enabled."
1188 endif # CONFIG_MODULES
1191 # Cleaning is done on three levels.
1192 # make clean Delete most generated files
1193 # Leave enough to build external modules
1194 # make mrproper Delete the current configuration, and all generated files
1195 # make distclean Remove editor backup files, patch leftover files and the like
1197 # Directories & files removed with 'make clean'
1198 CLEAN_DIRS += $(MODVERDIR)
1199 CLEAN_FILES += vmlinux System.map \
1200 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1202 # Directories & files removed with 'make mrproper'
1203 MRPROPER_DIRS += include/config include2 usr/include include/generated
1204 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1205 include/linux/autoconf.h include/linux/version.h \
1206 include/linux/utsrelease.h \
1207 include/linux/bounds.h include/asm*/asm-offsets.h \
1208 Module.symvers Module.markers tags TAGS cscope*
1210 # clean - Delete most, but leave enough to build external modules
1212 clean: rm-dirs := $(CLEAN_DIRS)
1213 clean: rm-files := $(CLEAN_FILES)
1214 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1216 PHONY += $(clean-dirs) clean archclean
1218 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1220 clean: archclean $(clean-dirs)
1223 @find . $(RCS_FIND_IGNORE) \
1224 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1225 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1226 -o -name '*.symtypes' -o -name 'modules.order' \
1227 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1228 -o -name '*.gcno' \) -type f -print | xargs rm -f
1230 # mrproper - Delete all generated files, including .config
1232 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1233 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1234 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1236 PHONY += $(mrproper-dirs) mrproper archmrproper
1238 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1240 mrproper: clean archmrproper $(mrproper-dirs)
1249 @find $(srctree) $(RCS_FIND_IGNORE) \
1250 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1251 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1252 -o -name '.*.rej' -o -size 0 \
1253 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1254 -type f -print | xargs rm -f
1257 # Packaging of the kernel to various formats
1258 # ---------------------------------------------------------------------------
1259 # rpm target kept for backward compatibility
1260 package-dir := $(srctree)/scripts/package
1262 %pkg: include/config/kernel.release FORCE
1263 $(Q)$(MAKE) $(build)=$(package-dir) $@
1264 rpm: include/config/kernel.release FORCE
1265 $(Q)$(MAKE) $(build)=$(package-dir) $@
1268 # Brief documentation of the typical targets used
1269 # ---------------------------------------------------------------------------
1271 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1272 boards := $(notdir $(boards))
1273 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1274 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1277 @echo 'Cleaning targets:'
1278 @echo ' clean - Remove most generated files but keep the config and'
1279 @echo ' enough build support to build external modules'
1280 @echo ' mrproper - Remove all generated files + config + various backup files'
1281 @echo ' distclean - mrproper + remove editor backup and patch files'
1283 @echo 'Configuration targets:'
1284 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1286 @echo 'Other generic targets:'
1287 @echo ' all - Build all targets marked with [*]'
1288 @echo '* vmlinux - Build the bare kernel'
1289 @echo '* modules - Build all modules'
1290 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1291 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1292 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1293 @echo ' dir/ - Build all files in dir and below'
1294 @echo ' dir/file.[ois] - Build specified target only'
1295 @echo ' dir/file.ko - Build module including final link'
1296 @echo ' modules_prepare - Set up for building external modules'
1297 @echo ' tags/TAGS - Generate tags file for editors'
1298 @echo ' cscope - Generate cscope index'
1299 @echo ' kernelrelease - Output the release version string'
1300 @echo ' kernelversion - Output the version stored in Makefile'
1301 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1302 echo ' (default: $(INSTALL_HDR_PATH))'; \
1304 @echo 'Static analysers'
1305 @echo ' checkstack - Generate a list of stack hogs'
1306 @echo ' namespacecheck - Name space analysis on compiled kernel'
1307 @echo ' versioncheck - Sanity check on version.h usage'
1308 @echo ' includecheck - Check for duplicate included header files'
1309 @echo ' export_report - List the usages of all exported symbols'
1310 @echo ' headers_check - Sanity check on exported headers'
1311 @echo ' headerdep - Detect inclusion cycles in headers'; \
1313 @echo 'Kernel packaging:'
1314 @$(MAKE) $(build)=$(package-dir) help
1316 @echo 'Documentation targets:'
1317 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1319 @echo 'Architecture specific targets ($(SRCARCH)):'
1320 @$(if $(archhelp),$(archhelp),\
1321 echo ' No architecture specific help defined for $(SRCARCH)')
1324 $(foreach b, $(boards), \
1325 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1327 @$(if $(board-dirs), \
1328 $(foreach b, $(board-dirs), \
1329 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1330 printf " %-16s - Show all of the above\\n" help-boards; \
1333 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1334 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1335 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1336 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1337 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1339 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1340 @echo 'For further info see the ./README file'
1343 help-board-dirs := $(addprefix help-,$(board-dirs))
1345 help-boards: $(help-board-dirs)
1347 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1349 $(help-board-dirs): help-%:
1350 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1351 @$(if $(boards-per-dir), \
1352 $(foreach b, $(boards-per-dir), \
1353 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1357 # Documentation targets
1358 # ---------------------------------------------------------------------------
1359 %docs: scripts_basic FORCE
1360 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1362 else # KBUILD_EXTMOD
1365 # External module support.
1366 # When building external modules the kernel used as basis is considered
1367 # read-only, and no consistency checks are made and the make
1368 # system is not used on the basis kernel. If updates are required
1369 # in the basis kernel ordinary make commands (without M=...) must
1372 # The following are the only valid targets when building external
1374 # make M=dir clean Delete all automatically generated files
1375 # make M=dir modules Make all modules in specified dir
1376 # make M=dir Same as 'make M=dir modules'
1377 # make M=dir modules_install
1378 # Install the modules built in the module directory
1379 # Assumes install directory is already created
1381 # We are always building modules
1383 PHONY += crmodverdir
1387 PHONY += $(objtree)/Module.symvers
1388 $(objtree)/Module.symvers:
1389 @test -e $(objtree)/Module.symvers || ( \
1391 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1392 echo " is missing; modules will have no dependencies and modversions."; \
1395 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1396 PHONY += $(module-dirs) modules
1397 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1398 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1400 modules: $(module-dirs)
1401 @$(kecho) ' Building modules, stage 2.';
1402 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1404 PHONY += modules_install
1405 modules_install: _emodinst_ _emodinst_post
1407 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1410 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1411 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1413 PHONY += _emodinst_post
1414 _emodinst_post: _emodinst_
1417 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1419 PHONY += $(clean-dirs) clean
1421 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1423 clean: rm-dirs := $(MODVERDIR)
1424 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1425 $(KBUILD_EXTMOD)/Module.markers \
1426 $(KBUILD_EXTMOD)/modules.order
1427 clean: $(clean-dirs)
1430 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1431 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1432 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1433 -o -name '*.gcno' \) -type f -print | xargs rm -f
1436 @echo ' Building external modules.'
1437 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1439 @echo ' modules - default target, build the module(s)'
1440 @echo ' modules_install - install the module'
1441 @echo ' clean - remove generated files in module directory only'
1445 PHONY += prepare scripts
1448 endif # KBUILD_EXTMOD
1450 # Generate tags for editors
1451 # ---------------------------------------------------------------------------
1452 quiet_cmd_tags = GEN $@
1453 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1455 tags TAGS cscope: FORCE
1458 # Scripts to check various things for consistency
1459 # ---------------------------------------------------------------------------
1462 find * $(RCS_FIND_IGNORE) \
1463 -name '*.[hcS]' -type f -print | sort \
1464 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1467 find * $(RCS_FIND_IGNORE) \
1468 -name '*.[hcS]' -type f -print | sort \
1469 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1472 $(PERL) $(srctree)/scripts/namespace.pl
1475 $(PERL) $(srctree)/scripts/export_report.pl
1477 endif #ifeq ($(config-targets),1)
1478 endif #ifeq ($(mixed-targets),1)
1480 PHONY += checkstack kernelrelease kernelversion
1482 # UML needs a little special treatment here. It wants to use the host
1483 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1484 # else wants $(ARCH), including people doing cross-builds, which means
1485 # that $(SUBARCH) doesn't work here.
1487 CHECKSTACK_ARCH := $(SUBARCH)
1489 CHECKSTACK_ARCH := $(ARCH)
1492 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1493 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1496 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1497 $(error kernelrelease not valid - run 'make prepare' to update it))
1499 @echo $(KERNELVERSION)
1502 # ---------------------------------------------------------------------------
1503 # Single targets are compatible with:
1504 # - build with mixed source and output
1505 # - build with separate output dir 'make O=...'
1506 # - external modules
1508 # target-dir => where to store outputfile
1509 # build-dir => directory in kernel source tree to use
1511 ifeq ($(KBUILD_EXTMOD),)
1512 build-dir = $(patsubst %/,%,$(dir $@))
1513 target-dir = $(dir $@)
1515 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1516 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1517 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1520 %.s: %.c prepare scripts FORCE
1521 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522 %.i: %.c prepare scripts FORCE
1523 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.o: %.c prepare scripts FORCE
1525 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.lst: %.c prepare scripts FORCE
1527 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528 %.s: %.S prepare scripts FORCE
1529 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530 %.o: %.S prepare scripts FORCE
1531 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532 %.symtypes: %.c prepare scripts FORCE
1533 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1536 /: prepare scripts FORCE
1538 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1539 $(build)=$(build-dir)
1540 %/: prepare scripts FORCE
1542 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1543 $(build)=$(build-dir)
1544 %.ko: prepare scripts FORCE
1546 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1547 $(build)=$(build-dir) $(@:.ko=.o)
1548 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1550 # FIXME Should go into a make.lib or something
1551 # ===========================================================================
1553 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1554 cmd_rmdirs = rm -rf $(rm-dirs)
1556 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1557 cmd_rmfiles = rm -f $(rm-files)
1559 # Run depmod only if we have System.map and depmod is executable
1560 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1562 if [ -r System.map -a -x $(DEPMOD) ]; then \
1563 $(DEPMOD) -ae -F System.map \
1564 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1568 # Create temporary dir for module support files
1569 # clean it up only when building all modules
1570 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1571 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1573 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1574 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1575 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1577 quiet_cmd_as_o_S = AS $@
1578 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1580 # read all saved command lines
1582 targets := $(wildcard $(sort $(targets)))
1583 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1585 ifneq ($(cmd_files),)
1586 $(cmd_files): ; # Do not try to update included dependency files
1587 include $(cmd_files)
1590 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1592 # $(Q)$(MAKE) $(clean)=dir
1593 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1595 endif # skip-makefile
1600 # Declare the contents of the .PHONY variable as phony. We keep that
1601 # information in a variable so we can use it in if_changed and friends.
1605 %.o: %.uu prepare scripts FORCE
1606 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)