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 := $(SUBARCH)
197 ifneq ($(wildcard ../toolchain/arm-eabi-4.4.0),)
198 CROSS_COMPILE ?= ../toolchain/arm-eabi-4.4.0/bin/arm-eabi-
200 ifneq ($(wildcard ../prebuilt/linux-x86/toolchain/arm-eabi-4.4.0),)
201 CROSS_COMPILE ?= ../prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi-
203 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
205 # Architecture as present in compile.h
206 UTS_MACHINE := $(ARCH)
209 # Additional ARCH settings for x86
213 ifeq ($(ARCH),x86_64)
217 # Additional ARCH settings for sparc
218 ifeq ($(ARCH),sparc32)
221 ifeq ($(ARCH),sparc64)
225 # Additional ARCH settings for sh
230 # Additional ARCH settings for tile
231 ifeq ($(ARCH),tilepro)
234 ifeq ($(ARCH),tilegx)
238 # Where to locate arch specific headers
239 hdr-arch := $(SRCARCH)
241 ifeq ($(ARCH),m68knommu)
245 KCONFIG_CONFIG ?= .config
246 export KCONFIG_CONFIG
248 # SHELL used by kbuild
249 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
250 else if [ -x /bin/bash ]; then echo /bin/bash; \
251 else echo sh; fi ; fi)
255 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
258 # Decide whether to build built-in, modular, or both.
259 # Normally, just do built-in.
264 # If we have only "make modules", don't compile built-in objects.
265 # When we're building modules with modversions, we need to consider
266 # the built-in objects during the descend as well, in order to
267 # make sure the checksums are up to date before we record them.
269 ifeq ($(MAKECMDGOALS),modules)
270 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
273 # If we have "make <whatever> modules", compile modules
274 # in addition to whatever we do anyway.
275 # Just "make" or "make all" shall build modules as well
277 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
281 ifeq ($(MAKECMDGOALS),)
285 export KBUILD_MODULES KBUILD_BUILTIN
286 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
289 # ---------------------------------------------------------------------------
291 # Normally, we echo the whole command before executing it. By making
292 # that echo $($(quiet)$(cmd)), we now have the possibility to set
293 # $(quiet) to choose other forms of output instead, e.g.
295 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
296 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
298 # If $(quiet) is empty, the whole command will be printed.
299 # If it is set to "quiet_", only the short version will be printed.
300 # If it is set to "silent_", nothing will be printed at all, since
301 # the variable $(silent_cmd_cc_o_c) doesn't exist.
303 # A simple variant is to prefix commands with $(Q) - that's useful
304 # for commands that shall be hidden in non-verbose mode.
308 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
309 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
311 ifeq ($(KBUILD_VERBOSE),1)
319 # If the user is running make -s (silent mode), suppress echoing of
322 ifneq ($(findstring s,$(MAKEFLAGS)),)
326 export quiet Q KBUILD_VERBOSE
329 # Look for make include files relative to root of kernel src
330 MAKEFLAGS += --include-dir=$(srctree)
332 # We need some generic definitions (do not try to remake the file).
333 $(srctree)/scripts/Kbuild.include: ;
334 include $(srctree)/scripts/Kbuild.include
336 # Make variables (CC, etc...)
338 AS = $(CROSS_COMPILE)as
339 ifneq ($(wildcard $(CROSS_COMPILE)ld.bfd),)
340 LD = $(CROSS_COMPILE)ld.bfd
342 LD = $(CROSS_COMPILE)ld
344 CC = $(CROSS_COMPILE)gcc
346 AR = $(CROSS_COMPILE)ar
347 NM = $(CROSS_COMPILE)nm
348 STRIP = $(CROSS_COMPILE)strip
349 OBJCOPY = $(CROSS_COMPILE)objcopy
350 OBJDUMP = $(CROSS_COMPILE)objdump
352 GENKSYMS = scripts/genksyms/genksyms
353 INSTALLKERNEL := installkernel
354 DEPMOD = /sbin/depmod
355 KALLSYMS = scripts/kallsyms
359 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
360 -Wbitwise -Wno-return-void $(CF)
366 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
369 # Use LINUXINCLUDE when you must reference the include/ directory.
370 # Needed to be compatible with the O= option
371 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \
372 -Iarch/$(hdr-arch)/include/generated -Iinclude \
373 $(if $(KBUILD_SRC), -I$(srctree)/include) \
374 -include include/generated/autoconf.h
376 KBUILD_CPPFLAGS := -D__KERNEL__
378 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
379 -fno-strict-aliasing -fno-common \
380 -Werror-implicit-function-declaration \
381 -Wno-format-security \
382 -fno-delete-null-pointer-checks
383 KBUILD_AFLAGS_KERNEL :=
384 KBUILD_CFLAGS_KERNEL :=
385 KBUILD_AFLAGS := -D__ASSEMBLY__
386 KBUILD_AFLAGS_MODULE := -DMODULE
387 KBUILD_CFLAGS_MODULE := -DMODULE
388 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
390 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
391 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
392 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
394 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
395 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
396 export CPP AR NM STRIP OBJCOPY OBJDUMP
397 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
398 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
400 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
401 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
402 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
403 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
404 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
405 export KBUILD_ARFLAGS
407 # When compiling out-of-tree modules, put MODVERDIR in the module
408 # tree rather than in the kernel tree. The kernel tree might
410 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
412 # Files to ignore in find ... statements
414 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
415 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
417 # ===========================================================================
418 # Rules shared between *config targets and build targets
420 # Basic helpers built in scripts/
421 PHONY += scripts_basic
423 $(Q)$(MAKE) $(build)=scripts/basic
424 $(Q)rm -f .tmp_quiet_recordmcount
426 # To avoid any implicit rule to kick in, define an empty command.
427 scripts/basic/%: scripts_basic ;
429 PHONY += outputmakefile
430 # outputmakefile generates a Makefile in the output directory, if using a
431 # separate output directory. This allows convenient use of make in the
434 ifneq ($(KBUILD_SRC),)
435 $(Q)ln -fsn $(srctree) source
436 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
437 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
440 # Support for using generic headers in asm-generic
443 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
444 obj=arch/$(SRCARCH)/include/generated/asm
446 # To make sure we do not include .config for any of the *config targets
447 # catch them early, and hand them over to scripts/kconfig/Makefile
448 # It is allowed to specify more targets when calling make, including
449 # mixing *config targets and build targets.
450 # For example 'make oldconfig all'.
451 # Detect when mixed targets is specified, and make a second invocation
452 # of make so .config is not included in this case either (for *config).
454 no-dot-config-targets := clean mrproper distclean \
455 cscope gtags TAGS tags help %docs check% coccicheck \
456 include/linux/version.h headers_% \
457 kernelversion %src-pkg
463 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
464 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
469 ifeq ($(KBUILD_EXTMOD),)
470 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
472 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
478 ifeq ($(mixed-targets),1)
479 # ===========================================================================
480 # We're called with mixed targets (*config and build targets).
481 # Handle them one by one.
484 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
487 ifeq ($(config-targets),1)
488 # ===========================================================================
489 # *config targets only - make sure prerequisites are updated, and descend
490 # in scripts/kconfig to make the *config target
492 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
493 # KBUILD_DEFCONFIG may point out an alternative default configuration
494 # used for 'make defconfig'
495 include $(srctree)/arch/$(SRCARCH)/Makefile
496 export KBUILD_DEFCONFIG KBUILD_KCONFIG
498 config: scripts_basic outputmakefile FORCE
499 $(Q)mkdir -p include/linux include/config
500 $(Q)$(MAKE) $(build)=scripts/kconfig $@
502 %config: scripts_basic outputmakefile FORCE
503 $(Q)mkdir -p include/linux include/config
504 $(Q)$(MAKE) $(build)=scripts/kconfig $@
507 # ===========================================================================
508 # Build targets only - this includes vmlinux, arch specific targets, clean
509 # targets and others. In general all targets except *config targets.
511 ifeq ($(KBUILD_EXTMOD),)
512 # Additional helpers built in scripts/
513 # Carefully list dependencies so we do not try to build scripts twice
516 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
517 $(Q)$(MAKE) $(build)=$(@)
519 # Objects we will link into vmlinux / subdirs we need to visit
521 drivers-y := drivers/ sound/ firmware/
525 endif # KBUILD_EXTMOD
527 ifeq ($(dot-config),1)
529 -include include/config/auto.conf
531 ifeq ($(KBUILD_EXTMOD),)
532 # Read in dependencies to all Kconfig* files, make sure to run
533 # oldconfig if changes are detected.
534 -include include/config/auto.conf.cmd
536 # To avoid any implicit rule to kick in, define an empty command
537 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
539 # If .config is newer than include/config/auto.conf, someone tinkered
540 # with it and forgot to run make oldconfig.
541 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
542 # we execute the config step to be sure to catch updated Kconfig files
543 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
544 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
546 # external modules needs include/generated/autoconf.h and include/config/auto.conf
547 # but do not care if they are up-to-date. Use auto.conf to trigger the test
548 PHONY += include/config/auto.conf
550 include/config/auto.conf:
551 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
553 echo " ERROR: Kernel configuration is invalid."; \
554 echo " include/generated/autoconf.h or $@ are missing.";\
555 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
559 endif # KBUILD_EXTMOD
562 # Dummy target needed, because used as prerequisite
563 include/config/auto.conf: ;
564 endif # $(dot-config)
566 # The all: target is the default when no target is given on the
568 # This allow a user to issue only 'make' to build a kernel including modules
569 # Defaults to vmlinux, but the arch makefile usually adds further targets
572 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
578 include $(srctree)/arch/$(SRCARCH)/Makefile
580 ifneq ($(CONFIG_FRAME_WARN),0)
581 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
584 # Force gcc to behave correct even for buggy distributions
585 ifndef CONFIG_CC_STACKPROTECTOR
586 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
589 # This warning generated too much noise in a regular build.
590 # Use make W=1 to enable this warning (see scripts/Makefile.build)
591 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
593 ifdef CONFIG_FRAME_POINTER
594 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
596 # Some targets (ARM with Thumb2, for example), can't be built with frame
597 # pointers. For those, we don't have FUNCTION_TRACER automatically
598 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
599 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
600 # -fomit-frame-pointer with FUNCTION_TRACER.
601 ifndef CONFIG_FUNCTION_TRACER
602 KBUILD_CFLAGS += -fomit-frame-pointer
606 ifdef CONFIG_DEBUG_INFO
608 KBUILD_AFLAGS += -gdwarf-2
611 ifdef CONFIG_DEBUG_INFO_REDUCED
612 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
615 ifdef CONFIG_FUNCTION_TRACER
617 ifdef CONFIG_DYNAMIC_FTRACE
618 ifdef CONFIG_HAVE_C_RECORDMCOUNT
619 BUILD_C_RECORDMCOUNT := y
620 export BUILD_C_RECORDMCOUNT
625 # We trigger additional mismatches with less inlining
626 ifdef CONFIG_DEBUG_SECTION_MISMATCH
627 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
630 # arch Makefile may override CC so keep this after arch Makefile is included
631 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
632 CHECKFLAGS += $(NOSTDINC_FLAGS)
634 # warn about C99 declaration after statement
635 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
637 # disable pointer signed / unsigned warnings in gcc 4.0
638 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
640 # disable invalid "can't wrap" optimizations for signed / pointers
641 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
643 # conserve stack if available
644 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
646 # use the deterministic mode of AR if available
647 KBUILD_ARFLAGS := $(call ar-option,D)
649 # check for 'asm goto'
650 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
651 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
654 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
655 # But warn user when we do so
657 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
659 ifneq ($(KCPPFLAGS),)
660 $(call warn-assign,CPPFLAGS)
661 KBUILD_CPPFLAGS += $(KCPPFLAGS)
664 $(call warn-assign,AFLAGS)
665 KBUILD_AFLAGS += $(KAFLAGS)
668 $(call warn-assign,CFLAGS)
669 KBUILD_CFLAGS += $(KCFLAGS)
672 # Use --build-id when available.
673 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
674 $(call cc-ldoption, -Wl$(comma)--build-id,))
675 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
676 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
678 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
679 LDFLAGS_vmlinux += $(call ld-option, -X,)
682 # Default kernel image to build when no specific target is given.
683 # KBUILD_IMAGE may be overruled on the command line or
684 # set in the environment
685 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
687 export KBUILD_IMAGE ?= vmlinux
690 # INSTALL_PATH specifies where to place the updated kernel and system map
691 # images. Default is /boot, but you can set it to other values
692 export INSTALL_PATH ?= /boot
695 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
696 # relocations required by build roots. This is not defined in the
697 # makefile but the argument can be passed to make if needed.
700 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
704 # INSTALL_MOD_STRIP, if defined, will cause modules to be
705 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
706 # the default option --strip-debug will be used. Otherwise,
707 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
709 ifdef INSTALL_MOD_STRIP
710 ifeq ($(INSTALL_MOD_STRIP),1)
711 mod_strip_cmd = $(STRIP) --strip-debug
713 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
714 endif # INSTALL_MOD_STRIP=1
717 endif # INSTALL_MOD_STRIP
721 ifeq ($(KBUILD_EXTMOD),)
722 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
724 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
725 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
726 $(net-y) $(net-m) $(libs-y) $(libs-m)))
728 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
730 $(core-n) $(core-) $(drivers-n) $(drivers-) \
731 $(net-n) $(net-) $(libs-n) $(libs-))))
733 init-y := $(patsubst %/, %/built-in.o, $(init-y))
734 core-y := $(patsubst %/, %/built-in.o, $(core-y))
735 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
736 net-y := $(patsubst %/, %/built-in.o, $(net-y))
737 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
738 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
739 libs-y := $(libs-y1) $(libs-y2)
742 # ---------------------------------------------------------------------------
743 # vmlinux is built from the objects selected by $(vmlinux-init) and
744 # $(vmlinux-main). Most are built-in.o files from top-level directories
745 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
746 # Ordering when linking is important, and $(vmlinux-init) must be first.
751 # +-< $(vmlinux-init)
752 # | +--< init/version.o + more
754 # +--< $(vmlinux-main)
755 # | +--< driver/built-in.o mm/built-in.o + more
757 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
759 # vmlinux version (uname -v) cannot be updated during normal
760 # descending-into-subdirs phase since we do not yet know if we need to
762 # Therefore this step is delayed until just before final link of vmlinux -
763 # except in the kallsyms case where it is done just before adding the
764 # symbols to the kernel.
766 # System.map is generated to document addresses of all kernel symbols
768 vmlinux-init := $(head-y) $(init-y)
769 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
770 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
771 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
772 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
774 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
775 # May be overridden by arch/$(ARCH)/Makefile
776 quiet_cmd_vmlinux__ ?= LD $@
777 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
778 -T $(vmlinux-lds) $(vmlinux-init) \
779 --start-group $(vmlinux-main) --end-group \
780 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
782 # Generate new vmlinux version
783 quiet_cmd_vmlinux_version = GEN .version
784 cmd_vmlinux_version = set -e; \
785 if [ ! -r .version ]; then \
789 mv .version .old_version; \
790 expr 0$$(cat .old_version) + 1 >.version; \
792 $(MAKE) $(build)=init
794 # Generate System.map
795 quiet_cmd_sysmap = SYSMAP
796 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
799 # If CONFIG_KALLSYMS is set .version is already updated
800 # Generate System.map and verify that the content is consistent
801 # Use + in front of the vmlinux_version rule to silent warning with make -j2
802 # First command is ':' to allow us to use + in front of the rule
803 define rule_vmlinux__
805 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
807 $(call cmd,vmlinux__)
808 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
810 $(Q)$(if $($(quiet)cmd_sysmap), \
811 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
812 $(cmd_sysmap) $@ System.map; \
813 if [ $$? -ne 0 ]; then \
821 ifdef CONFIG_KALLSYMS
822 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
823 # It's a three stage process:
824 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
826 # Running kallsyms on that gives us .tmp_kallsyms1.o with
827 # the right size - vmlinux version (uname -v) is updated during this step
828 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
829 # but due to the added section, some addresses have shifted.
830 # From here, we generate a correct .tmp_kallsyms2.o
831 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
832 # o Verify that the System.map from vmlinux matches the map from
833 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
834 # o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
835 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
836 # temporary bypass to allow the kernel to be built while the
837 # maintainers work out what went wrong with kallsyms.
841 ifdef KALLSYMS_EXTRA_PASS
842 ifneq ($(KALLSYMS_EXTRA_PASS),0)
847 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
849 define verify_kallsyms
850 $(Q)$(if $($(quiet)cmd_sysmap), \
851 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
852 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
853 $(Q)cmp -s System.map .tmp_System.map || \
854 (echo Inconsistent kallsyms data; \
855 echo This is a bug - please report about it; \
856 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \
857 rm .tmp_kallsyms* ; /bin/false )
860 # Update vmlinux version before link
861 # Use + in front of this rule to silent warning about make -j1
862 # First command is ':' to allow us to use + in front of this rule
863 cmd_ksym_ld = $(cmd_vmlinux__)
866 +$(call cmd,vmlinux_version)
867 $(call cmd,vmlinux__)
868 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
871 # Generate .S file with all kernel symbols
872 quiet_cmd_kallsyms = KSYM $@
873 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
874 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
876 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
877 $(call if_changed_dep,as_o_S)
879 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
882 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
883 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
884 $(call if_changed_rule,ksym_ld)
886 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
887 $(call if_changed,vmlinux__)
889 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
890 $(call if_changed,vmlinux__)
892 # Needs to visit scripts/ before $(KALLSYMS) can be used.
893 $(KALLSYMS): scripts ;
895 # Generate some data for debugging strange kallsyms problems
896 debug_kallsyms: .tmp_map$(last_kallsyms)
898 .tmp_map%: .tmp_vmlinux% FORCE
899 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
905 endif # ifdef CONFIG_KALLSYMS
907 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
908 # relevant sections renamed as per the linker script.
909 quiet_cmd_vmlinux-modpost = LD $@
910 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
911 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
912 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
913 define rule_vmlinux-modpost
915 +$(call cmd,vmlinux-modpost)
916 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
917 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
920 # vmlinux image - including updated kernel symbols
921 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
922 ifdef CONFIG_HEADERS_CHECK
923 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
926 $(Q)$(MAKE) $(build)=samples
928 ifdef CONFIG_BUILD_DOCSRC
929 $(Q)$(MAKE) $(build)=Documentation
931 $(call vmlinux-modpost)
932 $(call if_changed_rule,vmlinux__)
933 $(Q)rm -f .old_version
935 # build vmlinux.o first to catch section mismatch errors early
936 ifdef CONFIG_KALLSYMS
937 .tmp_vmlinux1: vmlinux.o
940 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
941 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
942 $(call if_changed_rule,vmlinux-modpost)
944 # The actual objects are generated when descending,
945 # make sure no implicit rule kicks in
946 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
948 # Handle descending into subdirectories listed in $(vmlinux-dirs)
949 # Preset locale variables to speed up the build process. Limit locale
950 # tweaks to this spot to avoid wrong language settings when running
951 # make menuconfig etc.
952 # Error messages still appears in the original language
954 PHONY += $(vmlinux-dirs)
955 $(vmlinux-dirs): prepare scripts
956 $(Q)$(MAKE) $(build)=$@
958 # Store (new) KERNELRELASE string in include/config/kernel.release
959 include/config/kernel.release: include/config/auto.conf FORCE
961 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
964 # Things we need to do before we recursively start building the kernel
965 # or the modules are listed in "prepare".
966 # A multi level approach is used. prepareN is processed before prepareN-1.
967 # archprepare is used in arch Makefiles and when processed asm symlink,
968 # version.h and scripts_basic is processed / created.
970 # Listed in dependency order
971 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
973 # prepare3 is used to check if we are building in a separate output directory,
975 # 1) Check that make has not been executed in the kernel src $(srctree)
976 prepare3: include/config/kernel.release
977 ifneq ($(KBUILD_SRC),)
978 @$(kecho) ' Using $(srctree) as source for kernel'
979 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
980 echo " $(srctree) is not clean, please run 'make mrproper'";\
981 echo " in the '$(srctree)' directory.";\
986 # prepare2 creates a makefile if using a separate output directory
987 prepare2: prepare3 outputmakefile asm-generic
989 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
990 include/config/auto.conf
993 archprepare: prepare1 scripts_basic
995 prepare0: archprepare FORCE
996 $(Q)$(MAKE) $(build)=.
997 $(Q)$(MAKE) $(build)=. missing-syscalls
999 # All the preparing..
1002 # Generate some files
1003 # ---------------------------------------------------------------------------
1005 # KERNELRELEASE can change from a few different places, meaning version.h
1006 # needs to be updated, so this check is forced on all builds
1009 define filechk_utsrelease.h
1010 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1011 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1014 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1017 define filechk_version.h
1018 (echo \#define LINUX_VERSION_CODE $(shell \
1019 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1020 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1023 include/linux/version.h: $(srctree)/Makefile FORCE
1024 $(call filechk,version.h)
1026 include/generated/utsrelease.h: include/config/kernel.release FORCE
1027 $(call filechk,utsrelease.h)
1031 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1032 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1034 # ---------------------------------------------------------------------------
1038 @echo '*** Warning: make $@ is unnecessary now.'
1040 # ---------------------------------------------------------------------------
1042 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1043 export INSTALL_FW_PATH
1045 PHONY += firmware_install
1046 firmware_install: FORCE
1047 @mkdir -p $(objtree)/firmware
1048 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1050 # ---------------------------------------------------------------------------
1053 #Default location for installed headers
1054 export INSTALL_HDR_PATH = $(objtree)/usr
1056 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1058 # If we do an all arch process set dst to asm-$(hdr-arch)
1059 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1062 __headers: include/linux/version.h scripts_basic asm-generic FORCE
1063 $(Q)$(MAKE) $(build)=scripts build_unifdef
1065 PHONY += headers_install_all
1066 headers_install_all:
1067 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1069 PHONY += headers_install
1070 headers_install: __headers
1071 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1072 $(error Headers not exportable for the $(SRCARCH) architecture))
1073 $(Q)$(MAKE) $(hdr-inst)=include
1074 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1076 PHONY += headers_check_all
1077 headers_check_all: headers_install_all
1078 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1080 PHONY += headers_check
1081 headers_check: headers_install
1082 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1083 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1085 # ---------------------------------------------------------------------------
1088 ifdef CONFIG_MODULES
1090 # By default, build modules as well
1096 # A module can be listed more than once in obj-m resulting in
1097 # duplicate lines in modules.order files. Those are removed
1098 # using awk while concatenating to the final file.
1101 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1102 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1103 @$(kecho) ' Building modules, stage 2.';
1104 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1105 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1107 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1108 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1110 %/modules.builtin: include/config/auto.conf
1111 $(Q)$(MAKE) $(modbuiltin)=$*
1114 # Target to prepare building external modules
1115 PHONY += modules_prepare
1116 modules_prepare: prepare scripts
1118 # Target to install modules
1119 PHONY += modules_install
1120 modules_install: _modinst_ _modinst_post
1124 @rm -rf $(MODLIB)/kernel
1125 @rm -f $(MODLIB)/source
1126 @mkdir -p $(MODLIB)/kernel
1127 @ln -s $(srctree) $(MODLIB)/source
1128 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1129 rm -f $(MODLIB)/build ; \
1130 ln -s $(objtree) $(MODLIB)/build ; \
1132 @cp -f $(objtree)/modules.order $(MODLIB)/
1133 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1134 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1136 # This depmod is only for convenience to give the initial
1137 # boot a modules.dep even before / is mounted read-write. However the
1138 # boot script depmod is the master version.
1139 PHONY += _modinst_post
1140 _modinst_post: _modinst_
1141 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1144 else # CONFIG_MODULES
1146 # Modules not configured
1147 # ---------------------------------------------------------------------------
1149 modules modules_install: FORCE
1151 @echo "The present kernel configuration has modules disabled."
1152 @echo "Type 'make config' and enable loadable module support."
1153 @echo "Then build a kernel with module support enabled."
1157 endif # CONFIG_MODULES
1160 # Cleaning is done on three levels.
1161 # make clean Delete most generated files
1162 # Leave enough to build external modules
1163 # make mrproper Delete the current configuration, and all generated files
1164 # make distclean Remove editor backup files, patch leftover files and the like
1166 # Directories & files removed with 'make clean'
1167 CLEAN_DIRS += $(MODVERDIR)
1168 CLEAN_FILES += vmlinux System.map \
1169 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1171 # Directories & files removed with 'make mrproper'
1172 MRPROPER_DIRS += include/config usr/include include/generated \
1173 arch/*/include/generated
1174 MRPROPER_FILES += .config .config.old .version .old_version \
1175 include/linux/version.h \
1176 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1178 # clean - Delete most, but leave enough to build external modules
1180 clean: rm-dirs := $(CLEAN_DIRS)
1181 clean: rm-files := $(CLEAN_FILES)
1182 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1184 PHONY += $(clean-dirs) clean archclean
1186 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1190 # mrproper - Delete all generated files, including .config
1192 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1193 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1194 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1196 PHONY += $(mrproper-dirs) mrproper archmrproper
1198 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1200 mrproper: clean archmrproper $(mrproper-dirs)
1209 @find $(srctree) $(RCS_FIND_IGNORE) \
1210 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1211 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1212 -o -name '.*.rej' -o -size 0 \
1213 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1214 -type f -print | xargs rm -f
1217 # Packaging of the kernel to various formats
1218 # ---------------------------------------------------------------------------
1219 # rpm target kept for backward compatibility
1220 package-dir := $(srctree)/scripts/package
1223 $(Q)$(MAKE) $(build)=$(package-dir) $@
1224 %pkg: include/config/kernel.release FORCE
1225 $(Q)$(MAKE) $(build)=$(package-dir) $@
1226 rpm: include/config/kernel.release FORCE
1227 $(Q)$(MAKE) $(build)=$(package-dir) $@
1230 # Brief documentation of the typical targets used
1231 # ---------------------------------------------------------------------------
1233 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1234 boards := $(notdir $(boards))
1235 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1236 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1239 @echo 'Cleaning targets:'
1240 @echo ' clean - Remove most generated files but keep the config and'
1241 @echo ' enough build support to build external modules'
1242 @echo ' mrproper - Remove all generated files + config + various backup files'
1243 @echo ' distclean - mrproper + remove editor backup and patch files'
1245 @echo 'Configuration targets:'
1246 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1248 @echo 'Other generic targets:'
1249 @echo ' all - Build all targets marked with [*]'
1250 @echo '* vmlinux - Build the bare kernel'
1251 @echo '* modules - Build all modules'
1252 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1253 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1254 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1255 @echo ' dir/ - Build all files in dir and below'
1256 @echo ' dir/file.[oisS] - Build specified target only'
1257 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1258 @echo ' (requires a recent binutils and recent build (System.map))'
1259 @echo ' dir/file.ko - Build module including final link'
1260 @echo ' modules_prepare - Set up for building external modules'
1261 @echo ' tags/TAGS - Generate tags file for editors'
1262 @echo ' cscope - Generate cscope index'
1263 @echo ' gtags - Generate GNU GLOBAL index'
1264 @echo ' kernelrelease - Output the release version string'
1265 @echo ' kernelversion - Output the version stored in Makefile'
1266 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1267 echo ' (default: $(INSTALL_HDR_PATH))'; \
1269 @echo 'Static analysers'
1270 @echo ' checkstack - Generate a list of stack hogs'
1271 @echo ' namespacecheck - Name space analysis on compiled kernel'
1272 @echo ' versioncheck - Sanity check on version.h usage'
1273 @echo ' includecheck - Check for duplicate included header files'
1274 @echo ' export_report - List the usages of all exported symbols'
1275 @echo ' headers_check - Sanity check on exported headers'
1276 @echo ' headerdep - Detect inclusion cycles in headers'
1277 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1279 @echo 'Kernel packaging:'
1280 @$(MAKE) $(build)=$(package-dir) help
1282 @echo 'Documentation targets:'
1283 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1285 @echo 'Architecture specific targets ($(SRCARCH)):'
1286 @$(if $(archhelp),$(archhelp),\
1287 echo ' No architecture specific help defined for $(SRCARCH)')
1290 $(foreach b, $(boards), \
1291 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1293 @$(if $(board-dirs), \
1294 $(foreach b, $(board-dirs), \
1295 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1296 printf " %-16s - Show all of the above\\n" help-boards; \
1299 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1300 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1301 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1302 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1303 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1304 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1305 @echo ' 1: warnings which may be relevant and do not occur too often'
1306 @echo ' 2: warnings which occur quite often but may still be relevant'
1307 @echo ' 3: more obscure warnings, can most likely be ignored'
1308 @echo ' Multiple levels can be combined with W=12 or W=123'
1309 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1311 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1312 @echo 'For further info see the ./README file'
1315 help-board-dirs := $(addprefix help-,$(board-dirs))
1317 help-boards: $(help-board-dirs)
1319 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1321 $(help-board-dirs): help-%:
1322 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1323 @$(if $(boards-per-dir), \
1324 $(foreach b, $(boards-per-dir), \
1325 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1329 # Documentation targets
1330 # ---------------------------------------------------------------------------
1331 %docs: scripts_basic FORCE
1332 $(Q)$(MAKE) $(build)=scripts build_docproc
1333 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1335 else # KBUILD_EXTMOD
1338 # External module support.
1339 # When building external modules the kernel used as basis is considered
1340 # read-only, and no consistency checks are made and the make
1341 # system is not used on the basis kernel. If updates are required
1342 # in the basis kernel ordinary make commands (without M=...) must
1345 # The following are the only valid targets when building external
1347 # make M=dir clean Delete all automatically generated files
1348 # make M=dir modules Make all modules in specified dir
1349 # make M=dir Same as 'make M=dir modules'
1350 # make M=dir modules_install
1351 # Install the modules built in the module directory
1352 # Assumes install directory is already created
1354 # We are always building modules
1356 PHONY += crmodverdir
1360 PHONY += $(objtree)/Module.symvers
1361 $(objtree)/Module.symvers:
1362 @test -e $(objtree)/Module.symvers || ( \
1364 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1365 echo " is missing; modules will have no dependencies and modversions."; \
1368 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1369 PHONY += $(module-dirs) modules
1370 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1371 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1373 modules: $(module-dirs)
1374 @$(kecho) ' Building modules, stage 2.';
1375 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1377 PHONY += modules_install
1378 modules_install: _emodinst_ _emodinst_post
1380 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1383 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1384 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1386 PHONY += _emodinst_post
1387 _emodinst_post: _emodinst_
1390 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1392 PHONY += $(clean-dirs) clean
1394 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1396 clean: rm-dirs := $(MODVERDIR)
1397 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1400 @echo ' Building external modules.'
1401 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1403 @echo ' modules - default target, build the module(s)'
1404 @echo ' modules_install - install the module'
1405 @echo ' clean - remove generated files in module directory only'
1409 PHONY += prepare scripts
1412 endif # KBUILD_EXTMOD
1414 clean: $(clean-dirs)
1417 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1418 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1419 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1420 -o -name '*.symtypes' -o -name 'modules.order' \
1421 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1422 -o -name '*.gcno' \) -type f -print | xargs rm -f
1424 # Generate tags for editors
1425 # ---------------------------------------------------------------------------
1426 quiet_cmd_tags = GEN $@
1427 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1429 tags TAGS cscope gtags: FORCE
1432 # Scripts to check various things for consistency
1433 # ---------------------------------------------------------------------------
1435 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1438 find $(srctree)/* $(RCS_FIND_IGNORE) \
1439 -name '*.[hcS]' -type f -print | sort \
1440 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1443 find $(srctree)/* $(RCS_FIND_IGNORE) \
1444 -name '*.[hcS]' -type f -print | sort \
1445 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1448 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1451 $(PERL) $(srctree)/scripts/namespace.pl
1454 $(PERL) $(srctree)/scripts/export_report.pl
1456 endif #ifeq ($(config-targets),1)
1457 endif #ifeq ($(mixed-targets),1)
1459 PHONY += checkstack kernelrelease kernelversion
1461 # UML needs a little special treatment here. It wants to use the host
1462 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1463 # else wants $(ARCH), including people doing cross-builds, which means
1464 # that $(SUBARCH) doesn't work here.
1466 CHECKSTACK_ARCH := $(SUBARCH)
1468 CHECKSTACK_ARCH := $(ARCH)
1471 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1472 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1475 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1478 @echo $(KERNELVERSION)
1481 # ---------------------------------------------------------------------------
1482 # Single targets are compatible with:
1483 # - build with mixed source and output
1484 # - build with separate output dir 'make O=...'
1485 # - external modules
1487 # target-dir => where to store outputfile
1488 # build-dir => directory in kernel source tree to use
1490 ifeq ($(KBUILD_EXTMOD),)
1491 build-dir = $(patsubst %/,%,$(dir $@))
1492 target-dir = $(dir $@)
1494 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1495 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1496 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1499 %.s: %.c prepare scripts FORCE
1500 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501 %.i: %.c prepare scripts FORCE
1502 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1503 %.o: %.c prepare scripts FORCE
1504 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1505 %.lst: %.c prepare scripts FORCE
1506 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1507 %.s: %.S prepare scripts FORCE
1508 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1509 %.o: %.S prepare scripts FORCE
1510 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1511 %.symtypes: %.c prepare scripts FORCE
1512 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1515 /: prepare scripts FORCE
1517 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1518 $(build)=$(build-dir)
1519 %/: prepare scripts FORCE
1521 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1522 $(build)=$(build-dir)
1523 %.ko: prepare scripts FORCE
1525 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1526 $(build)=$(build-dir) $(@:.ko=.o)
1527 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1529 # FIXME Should go into a make.lib or something
1530 # ===========================================================================
1532 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1533 cmd_rmdirs = rm -rf $(rm-dirs)
1535 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1536 cmd_rmfiles = rm -f $(rm-files)
1538 # Run depmod only if we have System.map and depmod is executable
1539 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1540 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1543 # Create temporary dir for module support files
1544 # clean it up only when building all modules
1545 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1546 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1548 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1549 $(KBUILD_AFLAGS_KERNEL) \
1550 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1551 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1553 quiet_cmd_as_o_S = AS $@
1554 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1556 # read all saved command lines
1558 targets := $(wildcard $(sort $(targets)))
1559 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1561 ifneq ($(cmd_files),)
1562 $(cmd_files): ; # Do not try to update included dependency files
1563 include $(cmd_files)
1566 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1568 # $(Q)$(MAKE) $(clean)=dir
1569 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1571 endif # skip-makefile
1576 # Declare the contents of the .PHONY variable as phony. We keep that
1577 # information in a variable so we can use it in if_changed and friends.
1581 %.o: %.uu prepare scripts FORCE
1582 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)