5 NAME = Saber-toothed Squirrel
8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
14 # o use make's built-in rules and variables
15 # (this increases performance and avoids hard-to-debug behaviour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
19 # Avoid funny character set dependencies
23 export LC_COLLATE LC_NUMERIC
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.o targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 # To put more focus on warnings, be less verbose as default
42 # Use 'make V=1' to see the full commands
44 ifeq ("$(origin V)", "command line")
51 # Call a source code checker (by default, "sparse") as part of the
54 # Use 'make C=1' to enable checking of only re-compiled files.
55 # Use 'make C=2' to enable checking of *all* source files, regardless
56 # of whether they are re-compiled or not.
58 # See the file "Documentation/sparse.txt" for more details, including
59 # where to get the "sparse" utility.
61 ifeq ("$(origin C)", "command line")
62 KBUILD_CHECKSRC = $(C)
64 ifndef KBUILD_CHECKSRC
68 # Use make M=dir to specify directory of external module to build
69 # Old syntax make ... SUBDIRS=$PWD is still supported
70 # Setting the environment variable KBUILD_EXTMOD take precedence
72 KBUILD_EXTMOD ?= $(SUBDIRS)
75 ifeq ("$(origin M)", "command line")
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
83 # Use "make O=dir/to/store/output/files/"
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
99 # OK, Make called in directory where kernel src resides
100 # Do we want to locate output files in a separate directory?
101 ifeq ("$(origin O)", "command line")
102 KBUILD_OUTPUT := $(O)
105 ifeq ("$(origin W)", "command line")
106 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
109 # That's our default target when none is given on the command line
113 # Cancel implicit rules on top Makefile
114 $(CURDIR)/Makefile Makefile: ;
116 ifneq ($(KBUILD_OUTPUT),)
117 # Invoke a second make in the output directory, passing relevant variables
118 # check that the output directory actually exists
119 saved-output := $(KBUILD_OUTPUT)
120 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
121 $(if $(KBUILD_OUTPUT),, \
122 $(error output directory "$(saved-output)" does not exist))
124 PHONY += $(MAKECMDGOALS) sub-make
126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
130 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
131 KBUILD_SRC=$(CURDIR) \
132 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
133 $(filter-out _all sub-make,$(MAKECMDGOALS))
135 # Leave processing to above invocation of make
137 endif # ifneq ($(KBUILD_OUTPUT),)
138 endif # ifeq ($(KBUILD_SRC),)
140 # We process the rest of the Makefile if this is the final invocation of make
141 ifeq ($(skip-makefile),)
143 # If building an external module we do not care about the all: rule
144 # but instead _all depend on modules
146 ifeq ($(KBUILD_EXTMOD),)
152 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
157 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
159 export srctree objtree VPATH
162 # SUBARCH tells the usermode build what the underlying arch is. That is set
163 # first, and if a usermode build is happening, the "ARCH=um" on the command
164 # line overrides the setting of ARCH below. If a native build is happening,
165 # then ARCH is assigned, getting whatever value it gets normally, and
166 # SUBARCH is subsequently ignored.
168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
174 # Cross compiling and selecting different set of gcc/bin-utils
175 # ---------------------------------------------------------------------------
177 # When performing cross compilation for other architectures ARCH shall be set
178 # to the target architecture. (See arch/* for the possibilities).
179 # ARCH can be set during invocation of make:
181 # Another way is to have ARCH set in the environment.
182 # The default ARCH is the host where make is executed.
184 # CROSS_COMPILE specify the prefix used for all executables used
185 # during compilation. Only gcc and related bin-utils executables
186 # are prefixed with $(CROSS_COMPILE).
187 # CROSS_COMPILE can be set on the command line
188 # make CROSS_COMPILE=ia64-linux-
189 # Alternatively CROSS_COMPILE can be set in the environment.
190 # A third alternative is to store a setting in .config so that plain
191 # "make" in the configured kernel build directory always uses that.
192 # Default value for CROSS_COMPILE is not to prefix executables
193 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
194 export KBUILD_BUILDHOST := $(SUBARCH)
196 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
198 # Architecture as present in compile.h
199 UTS_MACHINE := $(ARCH)
202 # Additional ARCH settings for x86
206 ifeq ($(ARCH),x86_64)
210 # Additional ARCH settings for sparc
211 ifeq ($(ARCH),sparc32)
214 ifeq ($(ARCH),sparc64)
218 # Additional ARCH settings for sh
223 # Additional ARCH settings for tile
224 ifeq ($(ARCH),tilepro)
227 ifeq ($(ARCH),tilegx)
231 # Where to locate arch specific headers
232 hdr-arch := $(SRCARCH)
234 ifeq ($(ARCH),m68knommu)
238 KCONFIG_CONFIG ?= .config
239 export KCONFIG_CONFIG
241 # SHELL used by kbuild
242 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
243 else if [ -x /bin/bash ]; then echo /bin/bash; \
244 else echo sh; fi ; fi)
248 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
251 # Decide whether to build built-in, modular, or both.
252 # Normally, just do built-in.
257 # If we have only "make modules", don't compile built-in objects.
258 # When we're building modules with modversions, we need to consider
259 # the built-in objects during the descend as well, in order to
260 # make sure the checksums are up to date before we record them.
262 ifeq ($(MAKECMDGOALS),modules)
263 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
266 # If we have "make <whatever> modules", compile modules
267 # in addition to whatever we do anyway.
268 # Just "make" or "make all" shall build modules as well
270 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
274 ifeq ($(MAKECMDGOALS),)
278 export KBUILD_MODULES KBUILD_BUILTIN
279 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
282 # ---------------------------------------------------------------------------
284 # Normally, we echo the whole command before executing it. By making
285 # that echo $($(quiet)$(cmd)), we now have the possibility to set
286 # $(quiet) to choose other forms of output instead, e.g.
288 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
289 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
291 # If $(quiet) is empty, the whole command will be printed.
292 # If it is set to "quiet_", only the short version will be printed.
293 # If it is set to "silent_", nothing will be printed at all, since
294 # the variable $(silent_cmd_cc_o_c) doesn't exist.
296 # A simple variant is to prefix commands with $(Q) - that's useful
297 # for commands that shall be hidden in non-verbose mode.
301 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
302 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
304 ifeq ($(KBUILD_VERBOSE),1)
312 # If the user is running make -s (silent mode), suppress echoing of
315 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
319 export quiet Q KBUILD_VERBOSE
322 # Look for make include files relative to root of kernel src
323 MAKEFLAGS += --include-dir=$(srctree)
325 # We need some generic definitions (do not try to remake the file).
326 $(srctree)/scripts/Kbuild.include: ;
327 include $(srctree)/scripts/Kbuild.include
329 # Make variables (CC, etc...)
331 AS = $(CROSS_COMPILE)as
332 LD = $(CROSS_COMPILE)ld
333 CC = $(CROSS_COMPILE)gcc
335 AR = $(CROSS_COMPILE)ar
336 NM = $(CROSS_COMPILE)nm
337 STRIP = $(CROSS_COMPILE)strip
338 OBJCOPY = $(CROSS_COMPILE)objcopy
339 OBJDUMP = $(CROSS_COMPILE)objdump
341 GENKSYMS = scripts/genksyms/genksyms
342 INSTALLKERNEL := installkernel
343 DEPMOD = /sbin/depmod
344 KALLSYMS = scripts/kallsyms
348 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
349 -Wbitwise -Wno-return-void $(CF)
355 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
358 # Use LINUXINCLUDE when you must reference the include/ directory.
359 # Needed to be compatible with the O= option
360 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \
361 -Iarch/$(hdr-arch)/include/generated -Iinclude \
362 $(if $(KBUILD_SRC), -I$(srctree)/include) \
363 -include $(srctree)/include/linux/kconfig.h
365 KBUILD_CPPFLAGS := -D__KERNEL__
367 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
368 -fno-strict-aliasing -fno-common \
369 -Werror-implicit-function-declaration \
370 -Wno-format-security \
371 -fno-delete-null-pointer-checks
372 KBUILD_AFLAGS_KERNEL :=
373 KBUILD_CFLAGS_KERNEL :=
374 KBUILD_AFLAGS := -D__ASSEMBLY__
375 KBUILD_AFLAGS_MODULE := -DMODULE
376 KBUILD_CFLAGS_MODULE := -DMODULE
377 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
379 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
380 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
381 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
383 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
384 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
385 export CPP AR NM STRIP OBJCOPY OBJDUMP
386 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
387 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
389 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
390 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
391 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
392 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
393 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
394 export KBUILD_ARFLAGS
396 # When compiling out-of-tree modules, put MODVERDIR in the module
397 # tree rather than in the kernel tree. The kernel tree might
399 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
401 # Files to ignore in find ... statements
403 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
404 -o -name .pc -o -name .hg -o -name .git \) -prune -o
405 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
406 --exclude CVS --exclude .pc --exclude .hg --exclude .git
408 # ===========================================================================
409 # Rules shared between *config targets and build targets
411 # Basic helpers built in scripts/
412 PHONY += scripts_basic
414 $(Q)$(MAKE) $(build)=scripts/basic
415 $(Q)rm -f .tmp_quiet_recordmcount
417 # To avoid any implicit rule to kick in, define an empty command.
418 scripts/basic/%: scripts_basic ;
420 PHONY += outputmakefile
421 # outputmakefile generates a Makefile in the output directory, if using a
422 # separate output directory. This allows convenient use of make in the
425 ifneq ($(KBUILD_SRC),)
426 $(Q)ln -fsn $(srctree) source
427 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
428 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
431 # Support for using generic headers in asm-generic
434 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
435 obj=arch/$(SRCARCH)/include/generated/asm
437 # To make sure we do not include .config for any of the *config targets
438 # catch them early, and hand them over to scripts/kconfig/Makefile
439 # It is allowed to specify more targets when calling make, including
440 # mixing *config targets and build targets.
441 # For example 'make oldconfig all'.
442 # Detect when mixed targets is specified, and make a second invocation
443 # of make so .config is not included in this case either (for *config).
445 no-dot-config-targets := clean mrproper distclean \
446 cscope gtags TAGS tags help %docs check% coccicheck \
447 include/linux/version.h headers_% archheaders archscripts \
448 kernelversion %src-pkg
454 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
455 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
460 ifeq ($(KBUILD_EXTMOD),)
461 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
463 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
469 ifeq ($(mixed-targets),1)
470 # ===========================================================================
471 # We're called with mixed targets (*config and build targets).
472 # Handle them one by one.
475 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
478 ifeq ($(config-targets),1)
479 # ===========================================================================
480 # *config targets only - make sure prerequisites are updated, and descend
481 # in scripts/kconfig to make the *config target
483 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
484 # KBUILD_DEFCONFIG may point out an alternative default configuration
485 # used for 'make defconfig'
486 include $(srctree)/arch/$(SRCARCH)/Makefile
487 export KBUILD_DEFCONFIG KBUILD_KCONFIG
489 config: scripts_basic outputmakefile FORCE
490 $(Q)mkdir -p include/linux include/config
491 $(Q)$(MAKE) $(build)=scripts/kconfig $@
493 %config: scripts_basic outputmakefile FORCE
494 $(Q)mkdir -p include/linux include/config
495 $(Q)$(MAKE) $(build)=scripts/kconfig $@
498 # ===========================================================================
499 # Build targets only - this includes vmlinux, arch specific targets, clean
500 # targets and others. In general all targets except *config targets.
502 ifeq ($(KBUILD_EXTMOD),)
503 # Additional helpers built in scripts/
504 # Carefully list dependencies so we do not try to build scripts twice
507 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
508 $(Q)$(MAKE) $(build)=$(@)
510 # Objects we will link into vmlinux / subdirs we need to visit
512 drivers-y := drivers/ sound/ firmware/
516 endif # KBUILD_EXTMOD
518 ifeq ($(dot-config),1)
520 -include include/config/auto.conf
522 ifeq ($(KBUILD_EXTMOD),)
523 # Read in dependencies to all Kconfig* files, make sure to run
524 # oldconfig if changes are detected.
525 -include include/config/auto.conf.cmd
527 # To avoid any implicit rule to kick in, define an empty command
528 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
530 # If .config is newer than include/config/auto.conf, someone tinkered
531 # with it and forgot to run make oldconfig.
532 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
533 # we execute the config step to be sure to catch updated Kconfig files
534 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
535 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
537 # external modules needs include/generated/autoconf.h and include/config/auto.conf
538 # but do not care if they are up-to-date. Use auto.conf to trigger the test
539 PHONY += include/config/auto.conf
541 include/config/auto.conf:
542 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
544 echo " ERROR: Kernel configuration is invalid."; \
545 echo " include/generated/autoconf.h or $@ are missing.";\
546 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
550 endif # KBUILD_EXTMOD
553 # Dummy target needed, because used as prerequisite
554 include/config/auto.conf: ;
555 endif # $(dot-config)
557 # The all: target is the default when no target is given on the
559 # This allow a user to issue only 'make' to build a kernel including modules
560 # Defaults to vmlinux, but the arch makefile usually adds further targets
563 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
569 ifdef CONFIG_READABLE_ASM
570 # Disable optimizations that make assembler listings hard to read.
571 # reorder blocks reorders the control in the function
572 # ipa clone creates specialized cloned functions
573 # partial inlining inlines only parts of functions
574 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
575 $(call cc-option,-fno-ipa-cp-clone,) \
576 $(call cc-option,-fno-partial-inlining)
579 include $(srctree)/arch/$(SRCARCH)/Makefile
581 ifneq ($(CONFIG_FRAME_WARN),0)
582 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
585 # Force gcc to behave correct even for buggy distributions
586 ifndef CONFIG_CC_STACKPROTECTOR
587 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
590 # This warning generated too much noise in a regular build.
591 # Use make W=1 to enable this warning (see scripts/Makefile.build)
592 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
594 ifdef CONFIG_FRAME_POINTER
595 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
597 # Some targets (ARM with Thumb2, for example), can't be built with frame
598 # pointers. For those, we don't have FUNCTION_TRACER automatically
599 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
600 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
601 # -fomit-frame-pointer with FUNCTION_TRACER.
602 ifndef CONFIG_FUNCTION_TRACER
603 KBUILD_CFLAGS += -fomit-frame-pointer
607 ifdef CONFIG_DEBUG_INFO
609 KBUILD_AFLAGS += -gdwarf-2
612 ifdef CONFIG_DEBUG_INFO_REDUCED
613 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
616 ifdef CONFIG_FUNCTION_TRACER
618 ifdef CONFIG_DYNAMIC_FTRACE
619 ifdef CONFIG_HAVE_C_RECORDMCOUNT
620 BUILD_C_RECORDMCOUNT := y
621 export BUILD_C_RECORDMCOUNT
626 # We trigger additional mismatches with less inlining
627 ifdef CONFIG_DEBUG_SECTION_MISMATCH
628 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
631 # arch Makefile may override CC so keep this after arch Makefile is included
632 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
633 CHECKFLAGS += $(NOSTDINC_FLAGS)
635 # warn about C99 declaration after statement
636 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
638 # disable pointer signed / unsigned warnings in gcc 4.0
639 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
641 # disable invalid "can't wrap" optimizations for signed / pointers
642 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
644 # conserve stack if available
645 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
647 # use the deterministic mode of AR if available
648 KBUILD_ARFLAGS := $(call ar-option,D)
650 # check for 'asm goto'
651 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
652 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
655 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
656 # But warn user when we do so
658 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
660 ifneq ($(KCPPFLAGS),)
661 $(call warn-assign,CPPFLAGS)
662 KBUILD_CPPFLAGS += $(KCPPFLAGS)
665 $(call warn-assign,AFLAGS)
666 KBUILD_AFLAGS += $(KAFLAGS)
669 $(call warn-assign,CFLAGS)
670 KBUILD_CFLAGS += $(KCFLAGS)
673 # Use --build-id when available.
674 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
675 $(call cc-ldoption, -Wl$(comma)--build-id,))
676 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
677 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
679 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
680 LDFLAGS_vmlinux += $(call ld-option, -X,)
683 # Default kernel image to build when no specific target is given.
684 # KBUILD_IMAGE may be overruled on the command line or
685 # set in the environment
686 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
688 export KBUILD_IMAGE ?= vmlinux
691 # INSTALL_PATH specifies where to place the updated kernel and system map
692 # images. Default is /boot, but you can set it to other values
693 export INSTALL_PATH ?= /boot
696 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
697 # relocations required by build roots. This is not defined in the
698 # makefile but the argument can be passed to make if needed.
701 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
705 # INSTALL_MOD_STRIP, if defined, will cause modules to be
706 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
707 # the default option --strip-debug will be used. Otherwise,
708 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
710 ifdef INSTALL_MOD_STRIP
711 ifeq ($(INSTALL_MOD_STRIP),1)
712 mod_strip_cmd = $(STRIP) --strip-debug
714 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
715 endif # INSTALL_MOD_STRIP=1
718 endif # INSTALL_MOD_STRIP
722 ifeq ($(KBUILD_EXTMOD),)
723 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
725 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
726 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
727 $(net-y) $(net-m) $(libs-y) $(libs-m)))
729 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
731 $(core-n) $(core-) $(drivers-n) $(drivers-) \
732 $(net-n) $(net-) $(libs-n) $(libs-))))
734 init-y := $(patsubst %/, %/built-in.o, $(init-y))
735 core-y := $(patsubst %/, %/built-in.o, $(core-y))
736 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
737 net-y := $(patsubst %/, %/built-in.o, $(net-y))
738 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
739 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
740 libs-y := $(libs-y1) $(libs-y2)
743 # ---------------------------------------------------------------------------
744 # vmlinux is built from the objects selected by $(vmlinux-init) and
745 # $(vmlinux-main). Most are built-in.o files from top-level directories
746 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
747 # Ordering when linking is important, and $(vmlinux-init) must be first.
752 # +-< $(vmlinux-init)
753 # | +--< init/version.o + more
755 # +--< $(vmlinux-main)
756 # | +--< driver/built-in.o mm/built-in.o + more
758 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
760 # vmlinux version (uname -v) cannot be updated during normal
761 # descending-into-subdirs phase since we do not yet know if we need to
763 # Therefore this step is delayed until just before final link of vmlinux -
764 # except in the kallsyms case where it is done just before adding the
765 # symbols to the kernel.
767 # System.map is generated to document addresses of all kernel symbols
769 vmlinux-init := $(head-y) $(init-y)
770 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
771 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
772 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
773 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
775 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
776 # May be overridden by arch/$(ARCH)/Makefile
777 quiet_cmd_vmlinux__ ?= LD $@
778 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
779 -T $(vmlinux-lds) $(vmlinux-init) \
780 --start-group $(vmlinux-main) --end-group \
781 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
783 # Generate new vmlinux version
784 quiet_cmd_vmlinux_version = GEN .version
785 cmd_vmlinux_version = set -e; \
786 if [ ! -r .version ]; then \
790 mv .version .old_version; \
791 expr 0$$(cat .old_version) + 1 >.version; \
793 $(MAKE) $(build)=init
795 # Generate System.map
796 quiet_cmd_sysmap = SYSMAP
797 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
799 # Sort exception table at build time
800 quiet_cmd_sortextable = SORTEX
801 cmd_sortextable = $(objtree)/scripts/sortextable
804 # If CONFIG_KALLSYMS is set .version is already updated
805 # Generate System.map and verify that the content is consistent
806 # Use + in front of the vmlinux_version rule to silent warning with make -j2
807 # First command is ':' to allow us to use + in front of the rule
808 define rule_vmlinux__
810 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
812 $(call cmd,vmlinux__)
813 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
815 $(if $(CONFIG_BUILDTIME_EXTABLE_SORT), \
816 $(Q)$(if $($(quiet)cmd_sortextable), \
817 echo ' $($(quiet)cmd_sortextable) vmlinux' &&) \
818 $(cmd_sortextable) vmlinux)
821 $(Q)$(if $($(quiet)cmd_sysmap), \
822 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
823 $(cmd_sysmap) $@ System.map; \
824 if [ $$? -ne 0 ]; then \
832 ifdef CONFIG_KALLSYMS
833 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
834 # It's a three stage process:
835 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
837 # Running kallsyms on that gives us .tmp_kallsyms1.o with
838 # the right size - vmlinux version (uname -v) is updated during this step
839 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
840 # but due to the added section, some addresses have shifted.
841 # From here, we generate a correct .tmp_kallsyms2.o
842 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
843 # o Verify that the System.map from vmlinux matches the map from
844 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
845 # o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
846 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
847 # temporary bypass to allow the kernel to be built while the
848 # maintainers work out what went wrong with kallsyms.
852 ifdef KALLSYMS_EXTRA_PASS
853 ifneq ($(KALLSYMS_EXTRA_PASS),0)
858 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
860 define verify_kallsyms
861 $(Q)$(if $($(quiet)cmd_sysmap), \
862 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
863 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
864 $(Q)cmp -s System.map .tmp_System.map || \
865 (echo Inconsistent kallsyms data; \
866 echo This is a bug - please report about it; \
867 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \
868 rm .tmp_kallsyms* ; /bin/false )
871 # Update vmlinux version before link
872 # Use + in front of this rule to silent warning about make -j1
873 # First command is ':' to allow us to use + in front of this rule
874 cmd_ksym_ld = $(cmd_vmlinux__)
877 +$(call cmd,vmlinux_version)
878 $(call cmd,vmlinux__)
879 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
882 # Generate .S file with all kernel symbols
883 quiet_cmd_kallsyms = KSYM $@
884 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
885 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
887 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
888 $(call if_changed_dep,as_o_S)
890 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
893 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
894 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
895 $(call if_changed_rule,ksym_ld)
897 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
898 $(call if_changed,vmlinux__)
900 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
901 $(call if_changed,vmlinux__)
903 # Needs to visit scripts/ before $(KALLSYMS) can be used.
904 $(KALLSYMS): scripts ;
906 # Generate some data for debugging strange kallsyms problems
907 debug_kallsyms: .tmp_map$(last_kallsyms)
909 .tmp_map%: .tmp_vmlinux% FORCE
910 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
916 endif # ifdef CONFIG_KALLSYMS
918 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
919 # relevant sections renamed as per the linker script.
920 quiet_cmd_vmlinux-modpost = LD $@
921 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
922 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
923 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
924 define rule_vmlinux-modpost
926 +$(call cmd,vmlinux-modpost)
927 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
928 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
931 # vmlinux image - including updated kernel symbols
932 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
933 ifdef CONFIG_HEADERS_CHECK
934 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
937 $(Q)$(MAKE) $(build)=samples
939 ifdef CONFIG_BUILD_DOCSRC
940 $(Q)$(MAKE) $(build)=Documentation
942 $(call vmlinux-modpost)
943 $(call if_changed_rule,vmlinux__)
944 $(Q)rm -f .old_version
946 # build vmlinux.o first to catch section mismatch errors early
947 ifdef CONFIG_KALLSYMS
948 .tmp_vmlinux1: vmlinux.o
951 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
952 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
953 $(call if_changed_rule,vmlinux-modpost)
955 # The actual objects are generated when descending,
956 # make sure no implicit rule kicks in
957 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
959 # Handle descending into subdirectories listed in $(vmlinux-dirs)
960 # Preset locale variables to speed up the build process. Limit locale
961 # tweaks to this spot to avoid wrong language settings when running
962 # make menuconfig etc.
963 # Error messages still appears in the original language
965 PHONY += $(vmlinux-dirs)
966 $(vmlinux-dirs): prepare scripts
967 $(Q)$(MAKE) $(build)=$@
969 # Store (new) KERNELRELASE string in include/config/kernel.release
970 include/config/kernel.release: include/config/auto.conf FORCE
972 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
975 # Things we need to do before we recursively start building the kernel
976 # or the modules are listed in "prepare".
977 # A multi level approach is used. prepareN is processed before prepareN-1.
978 # archprepare is used in arch Makefiles and when processed asm symlink,
979 # version.h and scripts_basic is processed / created.
981 # Listed in dependency order
982 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
984 # prepare3 is used to check if we are building in a separate output directory,
986 # 1) Check that make has not been executed in the kernel src $(srctree)
987 prepare3: include/config/kernel.release
988 ifneq ($(KBUILD_SRC),)
989 @$(kecho) ' Using $(srctree) as source for kernel'
990 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
991 echo " $(srctree) is not clean, please run 'make mrproper'"; \
992 echo " in the '$(srctree)' directory.";\
997 # prepare2 creates a makefile if using a separate output directory
998 prepare2: prepare3 outputmakefile asm-generic
1000 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
1001 include/config/auto.conf
1004 archprepare: archheaders archscripts prepare1 scripts_basic
1006 prepare0: archprepare FORCE
1007 $(Q)$(MAKE) $(build)=.
1009 # All the preparing..
1012 # Generate some files
1013 # ---------------------------------------------------------------------------
1015 # KERNELRELEASE can change from a few different places, meaning version.h
1016 # needs to be updated, so this check is forced on all builds
1019 define filechk_utsrelease.h
1020 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1021 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1024 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1027 define filechk_version.h
1028 (echo \#define LINUX_VERSION_CODE $(shell \
1029 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1030 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1033 include/linux/version.h: $(srctree)/Makefile FORCE
1034 $(call filechk,version.h)
1036 include/generated/utsrelease.h: include/config/kernel.release FORCE
1037 $(call filechk,utsrelease.h)
1041 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1042 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1044 # ---------------------------------------------------------------------------
1048 @echo '*** Warning: make $@ is unnecessary now.'
1050 # ---------------------------------------------------------------------------
1052 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1053 export INSTALL_FW_PATH
1055 PHONY += firmware_install
1056 firmware_install: FORCE
1057 @mkdir -p $(objtree)/firmware
1058 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1060 # ---------------------------------------------------------------------------
1063 #Default location for installed headers
1064 export INSTALL_HDR_PATH = $(objtree)/usr
1066 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1068 # If we do an all arch process set dst to asm-$(hdr-arch)
1069 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1071 PHONY += archheaders
1074 PHONY += archscripts
1078 __headers: include/linux/version.h scripts_basic asm-generic archheaders archscripts FORCE
1079 $(Q)$(MAKE) $(build)=scripts build_unifdef
1081 PHONY += headers_install_all
1082 headers_install_all:
1083 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1085 PHONY += headers_install
1086 headers_install: __headers
1087 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1088 $(error Headers not exportable for the $(SRCARCH) architecture))
1089 $(Q)$(MAKE) $(hdr-inst)=include
1090 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1092 PHONY += headers_check_all
1093 headers_check_all: headers_install_all
1094 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1096 PHONY += headers_check
1097 headers_check: headers_install
1098 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1099 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1101 # ---------------------------------------------------------------------------
1104 ifdef CONFIG_MODULES
1106 # By default, build modules as well
1112 # A module can be listed more than once in obj-m resulting in
1113 # duplicate lines in modules.order files. Those are removed
1114 # using awk while concatenating to the final file.
1117 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1118 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1119 @$(kecho) ' Building modules, stage 2.';
1120 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1121 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1123 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1124 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1126 %/modules.builtin: include/config/auto.conf
1127 $(Q)$(MAKE) $(modbuiltin)=$*
1130 # Target to prepare building external modules
1131 PHONY += modules_prepare
1132 modules_prepare: prepare scripts
1134 # Target to install modules
1135 PHONY += modules_install
1136 modules_install: _modinst_ _modinst_post
1140 @rm -rf $(MODLIB)/kernel
1141 @rm -f $(MODLIB)/source
1142 @mkdir -p $(MODLIB)/kernel
1143 @ln -s $(srctree) $(MODLIB)/source
1144 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1145 rm -f $(MODLIB)/build ; \
1146 ln -s $(objtree) $(MODLIB)/build ; \
1148 @cp -f $(objtree)/modules.order $(MODLIB)/
1149 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1150 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1152 # This depmod is only for convenience to give the initial
1153 # boot a modules.dep even before / is mounted read-write. However the
1154 # boot script depmod is the master version.
1155 PHONY += _modinst_post
1156 _modinst_post: _modinst_
1157 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1160 else # CONFIG_MODULES
1162 # Modules not configured
1163 # ---------------------------------------------------------------------------
1165 modules modules_install: FORCE
1167 @echo "The present kernel configuration has modules disabled."
1168 @echo "Type 'make config' and enable loadable module support."
1169 @echo "Then build a kernel with module support enabled."
1173 endif # CONFIG_MODULES
1176 # Cleaning is done on three levels.
1177 # make clean Delete most generated files
1178 # Leave enough to build external modules
1179 # make mrproper Delete the current configuration, and all generated files
1180 # make distclean Remove editor backup files, patch leftover files and the like
1182 # Directories & files removed with 'make clean'
1183 CLEAN_DIRS += $(MODVERDIR)
1184 CLEAN_FILES += vmlinux System.map \
1185 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1187 # Directories & files removed with 'make mrproper'
1188 MRPROPER_DIRS += include/config usr/include include/generated \
1189 arch/*/include/generated
1190 MRPROPER_FILES += .config .config.old .version .old_version \
1191 include/linux/version.h \
1192 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1194 # clean - Delete most, but leave enough to build external modules
1196 clean: rm-dirs := $(CLEAN_DIRS)
1197 clean: rm-files := $(CLEAN_FILES)
1198 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1200 PHONY += $(clean-dirs) clean archclean
1202 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1206 # mrproper - Delete all generated files, including .config
1208 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1209 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1210 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1212 PHONY += $(mrproper-dirs) mrproper archmrproper
1214 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1216 mrproper: clean archmrproper $(mrproper-dirs)
1225 @find $(srctree) $(RCS_FIND_IGNORE) \
1226 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1227 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1229 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1230 -type f -print | xargs rm -f
1233 # Packaging of the kernel to various formats
1234 # ---------------------------------------------------------------------------
1235 # rpm target kept for backward compatibility
1236 package-dir := $(srctree)/scripts/package
1239 $(Q)$(MAKE) $(build)=$(package-dir) $@
1240 %pkg: include/config/kernel.release FORCE
1241 $(Q)$(MAKE) $(build)=$(package-dir) $@
1242 rpm: include/config/kernel.release FORCE
1243 $(Q)$(MAKE) $(build)=$(package-dir) $@
1246 # Brief documentation of the typical targets used
1247 # ---------------------------------------------------------------------------
1249 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1250 boards := $(notdir $(boards))
1251 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1252 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1255 @echo 'Cleaning targets:'
1256 @echo ' clean - Remove most generated files but keep the config and'
1257 @echo ' enough build support to build external modules'
1258 @echo ' mrproper - Remove all generated files + config + various backup files'
1259 @echo ' distclean - mrproper + remove editor backup and patch files'
1261 @echo 'Configuration targets:'
1262 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1264 @echo 'Other generic targets:'
1265 @echo ' all - Build all targets marked with [*]'
1266 @echo '* vmlinux - Build the bare kernel'
1267 @echo '* modules - Build all modules'
1268 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1269 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1270 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1271 @echo ' dir/ - Build all files in dir and below'
1272 @echo ' dir/file.[oisS] - Build specified target only'
1273 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1274 @echo ' (requires a recent binutils and recent build (System.map))'
1275 @echo ' dir/file.ko - Build module including final link'
1276 @echo ' modules_prepare - Set up for building external modules'
1277 @echo ' tags/TAGS - Generate tags file for editors'
1278 @echo ' cscope - Generate cscope index'
1279 @echo ' gtags - Generate GNU GLOBAL index'
1280 @echo ' kernelrelease - Output the release version string'
1281 @echo ' kernelversion - Output the version stored in Makefile'
1282 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1283 echo ' (default: $(INSTALL_HDR_PATH))'; \
1285 @echo 'Static analysers'
1286 @echo ' checkstack - Generate a list of stack hogs'
1287 @echo ' namespacecheck - Name space analysis on compiled kernel'
1288 @echo ' versioncheck - Sanity check on version.h usage'
1289 @echo ' includecheck - Check for duplicate included header files'
1290 @echo ' export_report - List the usages of all exported symbols'
1291 @echo ' headers_check - Sanity check on exported headers'
1292 @echo ' headerdep - Detect inclusion cycles in headers'
1293 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1295 @echo 'Kernel packaging:'
1296 @$(MAKE) $(build)=$(package-dir) help
1298 @echo 'Documentation targets:'
1299 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1301 @echo 'Architecture specific targets ($(SRCARCH)):'
1302 @$(if $(archhelp),$(archhelp),\
1303 echo ' No architecture specific help defined for $(SRCARCH)')
1306 $(foreach b, $(boards), \
1307 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1309 @$(if $(board-dirs), \
1310 $(foreach b, $(board-dirs), \
1311 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1312 printf " %-16s - Show all of the above\\n" help-boards; \
1315 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1316 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1317 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1318 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1319 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1320 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1321 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1322 @echo ' 1: warnings which may be relevant and do not occur too often'
1323 @echo ' 2: warnings which occur quite often but may still be relevant'
1324 @echo ' 3: more obscure warnings, can most likely be ignored'
1325 @echo ' Multiple levels can be combined with W=12 or W=123'
1327 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1328 @echo 'For further info see the ./README file'
1331 help-board-dirs := $(addprefix help-,$(board-dirs))
1333 help-boards: $(help-board-dirs)
1335 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1337 $(help-board-dirs): help-%:
1338 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1339 @$(if $(boards-per-dir), \
1340 $(foreach b, $(boards-per-dir), \
1341 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1345 # Documentation targets
1346 # ---------------------------------------------------------------------------
1347 %docs: scripts_basic FORCE
1348 $(Q)$(MAKE) $(build)=scripts build_docproc
1349 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1351 else # KBUILD_EXTMOD
1354 # External module support.
1355 # When building external modules the kernel used as basis is considered
1356 # read-only, and no consistency checks are made and the make
1357 # system is not used on the basis kernel. If updates are required
1358 # in the basis kernel ordinary make commands (without M=...) must
1361 # The following are the only valid targets when building external
1363 # make M=dir clean Delete all automatically generated files
1364 # make M=dir modules Make all modules in specified dir
1365 # make M=dir Same as 'make M=dir modules'
1366 # make M=dir modules_install
1367 # Install the modules built in the module directory
1368 # Assumes install directory is already created
1370 # We are always building modules
1372 PHONY += crmodverdir
1376 PHONY += $(objtree)/Module.symvers
1377 $(objtree)/Module.symvers:
1378 @test -e $(objtree)/Module.symvers || ( \
1380 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1381 echo " is missing; modules will have no dependencies and modversions."; \
1384 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1385 PHONY += $(module-dirs) modules
1386 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1387 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1389 modules: $(module-dirs)
1390 @$(kecho) ' Building modules, stage 2.';
1391 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1393 PHONY += modules_install
1394 modules_install: _emodinst_ _emodinst_post
1396 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1399 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1400 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1402 PHONY += _emodinst_post
1403 _emodinst_post: _emodinst_
1406 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1408 PHONY += $(clean-dirs) clean
1410 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1412 clean: rm-dirs := $(MODVERDIR)
1413 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1416 @echo ' Building external modules.'
1417 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1419 @echo ' modules - default target, build the module(s)'
1420 @echo ' modules_install - install the module'
1421 @echo ' clean - remove generated files in module directory only'
1425 PHONY += prepare scripts
1428 endif # KBUILD_EXTMOD
1430 clean: $(clean-dirs)
1433 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1434 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1435 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1436 -o -name '*.symtypes' -o -name 'modules.order' \
1437 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1438 -o -name '*.gcno' \) -type f -print | xargs rm -f
1440 # Generate tags for editors
1441 # ---------------------------------------------------------------------------
1442 quiet_cmd_tags = GEN $@
1443 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1445 tags TAGS cscope gtags: FORCE
1448 # Scripts to check various things for consistency
1449 # ---------------------------------------------------------------------------
1451 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1454 find $(srctree)/* $(RCS_FIND_IGNORE) \
1455 -name '*.[hcS]' -type f -print | sort \
1456 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1459 find $(srctree)/* $(RCS_FIND_IGNORE) \
1460 -name '*.[hcS]' -type f -print | sort \
1461 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1464 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1467 $(PERL) $(srctree)/scripts/namespace.pl
1470 $(PERL) $(srctree)/scripts/export_report.pl
1472 endif #ifeq ($(config-targets),1)
1473 endif #ifeq ($(mixed-targets),1)
1475 PHONY += checkstack kernelrelease kernelversion
1477 # UML needs a little special treatment here. It wants to use the host
1478 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1479 # else wants $(ARCH), including people doing cross-builds, which means
1480 # that $(SUBARCH) doesn't work here.
1482 CHECKSTACK_ARCH := $(SUBARCH)
1484 CHECKSTACK_ARCH := $(ARCH)
1487 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1488 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1491 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1494 @echo $(KERNELVERSION)
1496 # Clear a bunch of variables before executing the submake
1498 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/
1501 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $*
1504 # ---------------------------------------------------------------------------
1505 # Single targets are compatible with:
1506 # - build with mixed source and output
1507 # - build with separate output dir 'make O=...'
1508 # - external modules
1510 # target-dir => where to store outputfile
1511 # build-dir => directory in kernel source tree to use
1513 ifeq ($(KBUILD_EXTMOD),)
1514 build-dir = $(patsubst %/,%,$(dir $@))
1515 target-dir = $(dir $@)
1517 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1518 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1519 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1522 %.s: %.c prepare scripts FORCE
1523 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.i: %.c prepare scripts FORCE
1525 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.o: %.c prepare scripts FORCE
1527 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528 %.lst: %.c prepare scripts FORCE
1529 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530 %.s: %.S prepare scripts FORCE
1531 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532 %.o: %.S prepare scripts FORCE
1533 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1534 %.symtypes: %.c prepare scripts FORCE
1535 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1538 /: prepare scripts FORCE
1540 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1541 $(build)=$(build-dir)
1542 %/: prepare scripts FORCE
1544 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1545 $(build)=$(build-dir)
1546 %.ko: prepare scripts FORCE
1548 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1549 $(build)=$(build-dir) $(@:.ko=.o)
1550 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1552 # FIXME Should go into a make.lib or something
1553 # ===========================================================================
1555 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1556 cmd_rmdirs = rm -rf $(rm-dirs)
1558 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1559 cmd_rmfiles = rm -f $(rm-files)
1561 # Run depmod only if we have System.map and depmod is executable
1562 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1563 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1566 # Create temporary dir for module support files
1567 # clean it up only when building all modules
1568 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1569 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1571 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1572 $(KBUILD_AFLAGS_KERNEL) \
1573 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1574 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1576 quiet_cmd_as_o_S = AS $@
1577 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1579 # read all saved command lines
1581 targets := $(wildcard $(sort $(targets)))
1582 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1584 ifneq ($(cmd_files),)
1585 $(cmd_files): ; # Do not try to update included dependency files
1586 include $(cmd_files)
1589 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1591 # $(Q)$(MAKE) $(clean)=dir
1592 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1594 endif # skip-makefile
1599 # Declare the contents of the .PHONY variable as phony. We keep that
1600 # information in a variable so we can use it in if_changed and friends.