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-4.4.3),)
198 CROSS_COMPILE ?= ../toolchain/arm-eabi-4.4.3/bin/arm-eabi-
200 ifneq ($(wildcard ../prebuilt/linux-x86/toolchain/arm-eabi-4.4.3),)
201 CROSS_COMPILE ?= ../prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/arm-eabi-
203 ifneq ($(wildcard ../prebuilts/gcc/linux-x86/arm/arm-eabi-4.6),)
204 CROSS_COMPILE ?= ../prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-
206 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
208 # Architecture as present in compile.h
209 UTS_MACHINE := $(ARCH)
212 # Additional ARCH settings for x86
216 ifeq ($(ARCH),x86_64)
220 # Additional ARCH settings for sparc
221 ifeq ($(ARCH),sparc32)
224 ifeq ($(ARCH),sparc64)
228 # Additional ARCH settings for sh
233 # Additional ARCH settings for tile
234 ifeq ($(ARCH),tilepro)
237 ifeq ($(ARCH),tilegx)
241 # Where to locate arch specific headers
242 hdr-arch := $(SRCARCH)
244 ifeq ($(ARCH),m68knommu)
248 KCONFIG_CONFIG ?= .config
249 export KCONFIG_CONFIG
251 # SHELL used by kbuild
252 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
253 else if [ -x /bin/bash ]; then echo /bin/bash; \
254 else echo sh; fi ; fi)
258 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
261 # Decide whether to build built-in, modular, or both.
262 # Normally, just do built-in.
267 # If we have only "make modules", don't compile built-in objects.
268 # When we're building modules with modversions, we need to consider
269 # the built-in objects during the descend as well, in order to
270 # make sure the checksums are up to date before we record them.
272 ifeq ($(MAKECMDGOALS),modules)
273 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
276 # If we have "make <whatever> modules", compile modules
277 # in addition to whatever we do anyway.
278 # Just "make" or "make all" shall build modules as well
280 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
284 ifeq ($(MAKECMDGOALS),)
288 export KBUILD_MODULES KBUILD_BUILTIN
289 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
292 # ---------------------------------------------------------------------------
294 # Normally, we echo the whole command before executing it. By making
295 # that echo $($(quiet)$(cmd)), we now have the possibility to set
296 # $(quiet) to choose other forms of output instead, e.g.
298 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
299 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
301 # If $(quiet) is empty, the whole command will be printed.
302 # If it is set to "quiet_", only the short version will be printed.
303 # If it is set to "silent_", nothing will be printed at all, since
304 # the variable $(silent_cmd_cc_o_c) doesn't exist.
306 # A simple variant is to prefix commands with $(Q) - that's useful
307 # for commands that shall be hidden in non-verbose mode.
311 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
312 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
314 ifeq ($(KBUILD_VERBOSE),1)
322 # If the user is running make -s (silent mode), suppress echoing of
325 ifneq ($(findstring s,$(MAKEFLAGS)),)
329 export quiet Q KBUILD_VERBOSE
332 # Look for make include files relative to root of kernel src
333 MAKEFLAGS += --include-dir=$(srctree)
335 # We need some generic definitions (do not try to remake the file).
336 $(srctree)/scripts/Kbuild.include: ;
337 include $(srctree)/scripts/Kbuild.include
339 # Make variables (CC, etc...)
341 AS = $(CROSS_COMPILE)as
342 ifneq ($(wildcard $(CROSS_COMPILE)ld.bfd),)
343 LD = $(CROSS_COMPILE)ld.bfd
345 LD = $(CROSS_COMPILE)ld
347 CC = $(CROSS_COMPILE)gcc
349 AR = $(CROSS_COMPILE)ar
350 NM = $(CROSS_COMPILE)nm
351 STRIP = $(CROSS_COMPILE)strip
352 OBJCOPY = $(CROSS_COMPILE)objcopy
353 OBJDUMP = $(CROSS_COMPILE)objdump
355 GENKSYMS = scripts/genksyms/genksyms
356 INSTALLKERNEL := installkernel
357 DEPMOD = /sbin/depmod
358 KALLSYMS = scripts/kallsyms
362 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
363 -Wbitwise -Wno-return-void $(CF)
369 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
372 # Use LINUXINCLUDE when you must reference the include/ directory.
373 # Needed to be compatible with the O= option
374 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \
375 -Iarch/$(hdr-arch)/include/generated -Iinclude \
376 $(if $(KBUILD_SRC), -I$(srctree)/include) \
377 -include include/generated/autoconf.h
379 KBUILD_CPPFLAGS := -D__KERNEL__
381 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
382 -fno-strict-aliasing -fno-common \
383 -Werror-implicit-function-declaration \
384 -Wno-format-security \
385 -fno-delete-null-pointer-checks
386 KBUILD_AFLAGS_KERNEL :=
387 KBUILD_CFLAGS_KERNEL :=
388 KBUILD_AFLAGS := -D__ASSEMBLY__
389 KBUILD_AFLAGS_MODULE := -DMODULE
390 KBUILD_CFLAGS_MODULE := -DMODULE
391 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
393 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
394 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
395 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
397 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
398 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
399 export CPP AR NM STRIP OBJCOPY OBJDUMP
400 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
401 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
403 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
404 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
405 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
406 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
407 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
408 export KBUILD_ARFLAGS
410 # When compiling out-of-tree modules, put MODVERDIR in the module
411 # tree rather than in the kernel tree. The kernel tree might
413 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
415 # Files to ignore in find ... statements
417 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
418 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
420 # ===========================================================================
421 # Rules shared between *config targets and build targets
423 # Basic helpers built in scripts/
424 PHONY += scripts_basic
426 $(Q)$(MAKE) $(build)=scripts/basic
427 $(Q)rm -f .tmp_quiet_recordmcount
429 # To avoid any implicit rule to kick in, define an empty command.
430 scripts/basic/%: scripts_basic ;
432 PHONY += outputmakefile
433 # outputmakefile generates a Makefile in the output directory, if using a
434 # separate output directory. This allows convenient use of make in the
437 ifneq ($(KBUILD_SRC),)
438 $(Q)ln -fsn $(srctree) source
439 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
440 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
443 # Support for using generic headers in asm-generic
446 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
447 obj=arch/$(SRCARCH)/include/generated/asm
449 # To make sure we do not include .config for any of the *config targets
450 # catch them early, and hand them over to scripts/kconfig/Makefile
451 # It is allowed to specify more targets when calling make, including
452 # mixing *config targets and build targets.
453 # For example 'make oldconfig all'.
454 # Detect when mixed targets is specified, and make a second invocation
455 # of make so .config is not included in this case either (for *config).
457 no-dot-config-targets := clean mrproper distclean \
458 cscope gtags TAGS tags help %docs check% coccicheck \
459 include/linux/version.h headers_% \
460 kernelversion %src-pkg
466 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
467 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
472 ifeq ($(KBUILD_EXTMOD),)
473 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
475 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
481 ifeq ($(mixed-targets),1)
482 # ===========================================================================
483 # We're called with mixed targets (*config and build targets).
484 # Handle them one by one.
487 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
490 ifeq ($(config-targets),1)
491 # ===========================================================================
492 # *config targets only - make sure prerequisites are updated, and descend
493 # in scripts/kconfig to make the *config target
495 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
496 # KBUILD_DEFCONFIG may point out an alternative default configuration
497 # used for 'make defconfig'
498 include $(srctree)/arch/$(SRCARCH)/Makefile
499 export KBUILD_DEFCONFIG KBUILD_KCONFIG
501 config: scripts_basic outputmakefile FORCE
502 $(Q)mkdir -p include/linux include/config
503 $(Q)$(MAKE) $(build)=scripts/kconfig $@
505 %config: scripts_basic outputmakefile FORCE
506 $(Q)mkdir -p include/linux include/config
507 $(Q)$(MAKE) $(build)=scripts/kconfig $@
510 # ===========================================================================
511 # Build targets only - this includes vmlinux, arch specific targets, clean
512 # targets and others. In general all targets except *config targets.
514 ifeq ($(KBUILD_EXTMOD),)
515 # Additional helpers built in scripts/
516 # Carefully list dependencies so we do not try to build scripts twice
519 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
520 $(Q)$(MAKE) $(build)=$(@)
522 # Objects we will link into vmlinux / subdirs we need to visit
524 drivers-y := drivers/ sound/ firmware/
528 endif # KBUILD_EXTMOD
530 ifeq ($(dot-config),1)
532 -include include/config/auto.conf
534 ifeq ($(KBUILD_EXTMOD),)
535 # Read in dependencies to all Kconfig* files, make sure to run
536 # oldconfig if changes are detected.
537 -include include/config/auto.conf.cmd
539 # To avoid any implicit rule to kick in, define an empty command
540 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
542 # If .config is newer than include/config/auto.conf, someone tinkered
543 # with it and forgot to run make oldconfig.
544 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
545 # we execute the config step to be sure to catch updated Kconfig files
546 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
547 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
549 # external modules needs include/generated/autoconf.h and include/config/auto.conf
550 # but do not care if they are up-to-date. Use auto.conf to trigger the test
551 PHONY += include/config/auto.conf
553 include/config/auto.conf:
554 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
556 echo " ERROR: Kernel configuration is invalid."; \
557 echo " include/generated/autoconf.h or $@ are missing.";\
558 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
562 endif # KBUILD_EXTMOD
565 # Dummy target needed, because used as prerequisite
566 include/config/auto.conf: ;
567 endif # $(dot-config)
569 # The all: target is the default when no target is given on the
571 # This allow a user to issue only 'make' to build a kernel including modules
572 # Defaults to vmlinux, but the arch makefile usually adds further targets
575 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
581 include $(srctree)/arch/$(SRCARCH)/Makefile
583 ifneq ($(CONFIG_FRAME_WARN),0)
584 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
587 # Force gcc to behave correct even for buggy distributions
588 ifndef CONFIG_CC_STACKPROTECTOR
589 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
592 # This warning generated too much noise in a regular build.
593 # Use make W=1 to enable this warning (see scripts/Makefile.build)
594 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
596 ifdef CONFIG_FRAME_POINTER
597 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
599 # Some targets (ARM with Thumb2, for example), can't be built with frame
600 # pointers. For those, we don't have FUNCTION_TRACER automatically
601 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
602 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
603 # -fomit-frame-pointer with FUNCTION_TRACER.
604 ifndef CONFIG_FUNCTION_TRACER
605 KBUILD_CFLAGS += -fomit-frame-pointer
609 ifdef CONFIG_DEBUG_INFO
611 KBUILD_AFLAGS += -gdwarf-2
614 ifdef CONFIG_DEBUG_INFO_REDUCED
615 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
618 ifdef CONFIG_FUNCTION_TRACER
620 ifdef CONFIG_DYNAMIC_FTRACE
621 ifdef CONFIG_HAVE_C_RECORDMCOUNT
622 BUILD_C_RECORDMCOUNT := y
623 export BUILD_C_RECORDMCOUNT
628 # We trigger additional mismatches with less inlining
629 ifdef CONFIG_DEBUG_SECTION_MISMATCH
630 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
633 # arch Makefile may override CC so keep this after arch Makefile is included
634 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
635 CHECKFLAGS += $(NOSTDINC_FLAGS)
637 # warn about C99 declaration after statement
638 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
640 # disable pointer signed / unsigned warnings in gcc 4.0
641 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
643 # disable invalid "can't wrap" optimizations for signed / pointers
644 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
646 # conserve stack if available
647 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
649 # use the deterministic mode of AR if available
650 KBUILD_ARFLAGS := $(call ar-option,D)
652 # check for 'asm goto'
653 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
654 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
657 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
658 # But warn user when we do so
660 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
662 ifneq ($(KCPPFLAGS),)
663 $(call warn-assign,CPPFLAGS)
664 KBUILD_CPPFLAGS += $(KCPPFLAGS)
667 $(call warn-assign,AFLAGS)
668 KBUILD_AFLAGS += $(KAFLAGS)
671 $(call warn-assign,CFLAGS)
672 KBUILD_CFLAGS += $(KCFLAGS)
675 # Use --build-id when available.
676 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
677 $(call cc-ldoption, -Wl$(comma)--build-id,))
678 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
679 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
681 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
682 LDFLAGS_vmlinux += $(call ld-option, -X,)
685 # Default kernel image to build when no specific target is given.
686 # KBUILD_IMAGE may be overruled on the command line or
687 # set in the environment
688 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
690 export KBUILD_IMAGE ?= vmlinux
693 # INSTALL_PATH specifies where to place the updated kernel and system map
694 # images. Default is /boot, but you can set it to other values
695 export INSTALL_PATH ?= /boot
698 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
699 # relocations required by build roots. This is not defined in the
700 # makefile but the argument can be passed to make if needed.
703 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
707 # INSTALL_MOD_STRIP, if defined, will cause modules to be
708 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
709 # the default option --strip-debug will be used. Otherwise,
710 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
712 ifdef INSTALL_MOD_STRIP
713 ifeq ($(INSTALL_MOD_STRIP),1)
714 mod_strip_cmd = $(STRIP) --strip-debug
716 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
717 endif # INSTALL_MOD_STRIP=1
720 endif # INSTALL_MOD_STRIP
724 ifeq ($(KBUILD_EXTMOD),)
725 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
727 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
728 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
729 $(net-y) $(net-m) $(libs-y) $(libs-m)))
731 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
733 $(core-n) $(core-) $(drivers-n) $(drivers-) \
734 $(net-n) $(net-) $(libs-n) $(libs-))))
736 init-y := $(patsubst %/, %/built-in.o, $(init-y))
737 core-y := $(patsubst %/, %/built-in.o, $(core-y))
738 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
739 net-y := $(patsubst %/, %/built-in.o, $(net-y))
740 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
741 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
742 libs-y := $(libs-y1) $(libs-y2)
745 # ---------------------------------------------------------------------------
746 # vmlinux is built from the objects selected by $(vmlinux-init) and
747 # $(vmlinux-main). Most are built-in.o files from top-level directories
748 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
749 # Ordering when linking is important, and $(vmlinux-init) must be first.
754 # +-< $(vmlinux-init)
755 # | +--< init/version.o + more
757 # +--< $(vmlinux-main)
758 # | +--< driver/built-in.o mm/built-in.o + more
760 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
762 # vmlinux version (uname -v) cannot be updated during normal
763 # descending-into-subdirs phase since we do not yet know if we need to
765 # Therefore this step is delayed until just before final link of vmlinux -
766 # except in the kallsyms case where it is done just before adding the
767 # symbols to the kernel.
769 # System.map is generated to document addresses of all kernel symbols
771 vmlinux-init := $(head-y) $(init-y)
772 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
773 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
774 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
775 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
777 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
778 # May be overridden by arch/$(ARCH)/Makefile
779 quiet_cmd_vmlinux__ ?= LD $@
780 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
781 -T $(vmlinux-lds) $(vmlinux-init) \
782 --start-group $(vmlinux-main) --end-group \
783 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
785 # Generate new vmlinux version
786 quiet_cmd_vmlinux_version = GEN .version
787 cmd_vmlinux_version = set -e; \
788 if [ ! -r .version ]; then \
792 mv .version .old_version; \
793 expr 0$$(cat .old_version) + 1 >.version; \
795 $(MAKE) $(build)=init
797 # Generate System.map
798 quiet_cmd_sysmap = SYSMAP
799 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
802 # If CONFIG_KALLSYMS is set .version is already updated
803 # Generate System.map and verify that the content is consistent
804 # Use + in front of the vmlinux_version rule to silent warning with make -j2
805 # First command is ':' to allow us to use + in front of the rule
806 define rule_vmlinux__
808 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
810 $(call cmd,vmlinux__)
811 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
813 $(Q)$(if $($(quiet)cmd_sysmap), \
814 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
815 $(cmd_sysmap) $@ System.map; \
816 if [ $$? -ne 0 ]; then \
824 ifdef CONFIG_KALLSYMS
825 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
826 # It's a three stage process:
827 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
829 # Running kallsyms on that gives us .tmp_kallsyms1.o with
830 # the right size - vmlinux version (uname -v) is updated during this step
831 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
832 # but due to the added section, some addresses have shifted.
833 # From here, we generate a correct .tmp_kallsyms2.o
834 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
835 # o Verify that the System.map from vmlinux matches the map from
836 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
837 # o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
838 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
839 # temporary bypass to allow the kernel to be built while the
840 # maintainers work out what went wrong with kallsyms.
844 ifdef KALLSYMS_EXTRA_PASS
845 ifneq ($(KALLSYMS_EXTRA_PASS),0)
850 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
852 define verify_kallsyms
853 $(Q)$(if $($(quiet)cmd_sysmap), \
854 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
855 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
856 $(Q)cmp -s System.map .tmp_System.map || \
857 (echo Inconsistent kallsyms data; \
858 echo This is a bug - please report about it; \
859 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \
860 rm .tmp_kallsyms* ; /bin/false )
863 # Update vmlinux version before link
864 # Use + in front of this rule to silent warning about make -j1
865 # First command is ':' to allow us to use + in front of this rule
866 cmd_ksym_ld = $(cmd_vmlinux__)
869 +$(call cmd,vmlinux_version)
870 $(call cmd,vmlinux__)
871 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
874 # Generate .S file with all kernel symbols
875 quiet_cmd_kallsyms = KSYM $@
876 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
877 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
879 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
880 $(call if_changed_dep,as_o_S)
882 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
885 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
886 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
887 $(call if_changed_rule,ksym_ld)
889 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
890 $(call if_changed,vmlinux__)
892 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
893 $(call if_changed,vmlinux__)
895 # Needs to visit scripts/ before $(KALLSYMS) can be used.
896 $(KALLSYMS): scripts ;
898 # Generate some data for debugging strange kallsyms problems
899 debug_kallsyms: .tmp_map$(last_kallsyms)
901 .tmp_map%: .tmp_vmlinux% FORCE
902 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
908 endif # ifdef CONFIG_KALLSYMS
910 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
911 # relevant sections renamed as per the linker script.
912 quiet_cmd_vmlinux-modpost = LD $@
913 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
914 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
915 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
916 define rule_vmlinux-modpost
918 +$(call cmd,vmlinux-modpost)
919 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
920 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
923 # vmlinux image - including updated kernel symbols
924 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
925 ifdef CONFIG_HEADERS_CHECK
926 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
929 $(Q)$(MAKE) $(build)=samples
931 ifdef CONFIG_BUILD_DOCSRC
932 $(Q)$(MAKE) $(build)=Documentation
934 $(call vmlinux-modpost)
935 $(call if_changed_rule,vmlinux__)
936 $(Q)rm -f .old_version
938 # build vmlinux.o first to catch section mismatch errors early
939 ifdef CONFIG_KALLSYMS
940 .tmp_vmlinux1: vmlinux.o
943 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
944 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
945 $(call if_changed_rule,vmlinux-modpost)
947 # The actual objects are generated when descending,
948 # make sure no implicit rule kicks in
949 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
951 # Handle descending into subdirectories listed in $(vmlinux-dirs)
952 # Preset locale variables to speed up the build process. Limit locale
953 # tweaks to this spot to avoid wrong language settings when running
954 # make menuconfig etc.
955 # Error messages still appears in the original language
957 PHONY += $(vmlinux-dirs)
958 $(vmlinux-dirs): prepare scripts
959 $(Q)$(MAKE) $(build)=$@
961 # Store (new) KERNELRELASE string in include/config/kernel.release
962 include/config/kernel.release: include/config/auto.conf FORCE
964 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
967 # Things we need to do before we recursively start building the kernel
968 # or the modules are listed in "prepare".
969 # A multi level approach is used. prepareN is processed before prepareN-1.
970 # archprepare is used in arch Makefiles and when processed asm symlink,
971 # version.h and scripts_basic is processed / created.
973 # Listed in dependency order
974 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
976 # prepare3 is used to check if we are building in a separate output directory,
978 # 1) Check that make has not been executed in the kernel src $(srctree)
979 prepare3: include/config/kernel.release
980 ifneq ($(KBUILD_SRC),)
981 @$(kecho) ' Using $(srctree) as source for kernel'
982 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
983 echo " $(srctree) is not clean, please run 'make mrproper'";\
984 echo " in the '$(srctree)' directory.";\
989 # prepare2 creates a makefile if using a separate output directory
990 prepare2: prepare3 outputmakefile asm-generic
992 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
993 include/config/auto.conf
996 archprepare: prepare1 scripts_basic
998 prepare0: archprepare FORCE
999 $(Q)$(MAKE) $(build)=.
1000 $(Q)$(MAKE) $(build)=. missing-syscalls
1002 # All the preparing..
1005 # Generate some files
1006 # ---------------------------------------------------------------------------
1008 # KERNELRELEASE can change from a few different places, meaning version.h
1009 # needs to be updated, so this check is forced on all builds
1012 define filechk_utsrelease.h
1013 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1014 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1017 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1020 define filechk_version.h
1021 (echo \#define LINUX_VERSION_CODE $(shell \
1022 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1023 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1026 include/linux/version.h: $(srctree)/Makefile FORCE
1027 $(call filechk,version.h)
1029 include/generated/utsrelease.h: include/config/kernel.release FORCE
1030 $(call filechk,utsrelease.h)
1034 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1035 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1037 # ---------------------------------------------------------------------------
1041 @echo '*** Warning: make $@ is unnecessary now.'
1043 # ---------------------------------------------------------------------------
1045 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1046 export INSTALL_FW_PATH
1048 PHONY += firmware_install
1049 firmware_install: FORCE
1050 @mkdir -p $(objtree)/firmware
1051 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1053 # ---------------------------------------------------------------------------
1056 #Default location for installed headers
1057 export INSTALL_HDR_PATH = $(objtree)/usr
1059 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1061 # If we do an all arch process set dst to asm-$(hdr-arch)
1062 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1065 __headers: include/linux/version.h scripts_basic asm-generic FORCE
1066 $(Q)$(MAKE) $(build)=scripts build_unifdef
1068 PHONY += headers_install_all
1069 headers_install_all:
1070 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1072 PHONY += headers_install
1073 headers_install: __headers
1074 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1075 $(error Headers not exportable for the $(SRCARCH) architecture))
1076 $(Q)$(MAKE) $(hdr-inst)=include
1077 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1079 PHONY += headers_check_all
1080 headers_check_all: headers_install_all
1081 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1083 PHONY += headers_check
1084 headers_check: headers_install
1085 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1086 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1088 # ---------------------------------------------------------------------------
1091 ifdef CONFIG_MODULES
1093 # By default, build modules as well
1099 # A module can be listed more than once in obj-m resulting in
1100 # duplicate lines in modules.order files. Those are removed
1101 # using awk while concatenating to the final file.
1104 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1105 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1106 @$(kecho) ' Building modules, stage 2.';
1107 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1108 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1110 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1111 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1113 %/modules.builtin: include/config/auto.conf
1114 $(Q)$(MAKE) $(modbuiltin)=$*
1117 # Target to prepare building external modules
1118 PHONY += modules_prepare
1119 modules_prepare: prepare scripts
1121 # Target to install modules
1122 PHONY += modules_install
1123 modules_install: _modinst_ _modinst_post
1127 @rm -rf $(MODLIB)/kernel
1128 @rm -f $(MODLIB)/source
1129 @mkdir -p $(MODLIB)/kernel
1130 @ln -s $(srctree) $(MODLIB)/source
1131 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1132 rm -f $(MODLIB)/build ; \
1133 ln -s $(objtree) $(MODLIB)/build ; \
1135 @cp -f $(objtree)/modules.order $(MODLIB)/
1136 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1137 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1139 # This depmod is only for convenience to give the initial
1140 # boot a modules.dep even before / is mounted read-write. However the
1141 # boot script depmod is the master version.
1142 PHONY += _modinst_post
1143 _modinst_post: _modinst_
1144 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1147 else # CONFIG_MODULES
1149 # Modules not configured
1150 # ---------------------------------------------------------------------------
1152 modules modules_install: FORCE
1154 @echo "The present kernel configuration has modules disabled."
1155 @echo "Type 'make config' and enable loadable module support."
1156 @echo "Then build a kernel with module support enabled."
1160 endif # CONFIG_MODULES
1163 # Cleaning is done on three levels.
1164 # make clean Delete most generated files
1165 # Leave enough to build external modules
1166 # make mrproper Delete the current configuration, and all generated files
1167 # make distclean Remove editor backup files, patch leftover files and the like
1169 # Directories & files removed with 'make clean'
1170 CLEAN_DIRS += $(MODVERDIR)
1171 CLEAN_FILES += vmlinux System.map \
1172 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1174 # Directories & files removed with 'make mrproper'
1175 MRPROPER_DIRS += include/config usr/include include/generated \
1176 arch/*/include/generated
1177 MRPROPER_FILES += .config .config.old .version .old_version \
1178 include/linux/version.h \
1179 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1181 # clean - Delete most, but leave enough to build external modules
1183 clean: rm-dirs := $(CLEAN_DIRS)
1184 clean: rm-files := $(CLEAN_FILES)
1185 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1187 PHONY += $(clean-dirs) clean archclean
1189 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1193 # mrproper - Delete all generated files, including .config
1195 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1196 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1197 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1199 PHONY += $(mrproper-dirs) mrproper archmrproper
1201 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1203 mrproper: clean archmrproper $(mrproper-dirs)
1212 @find $(srctree) $(RCS_FIND_IGNORE) \
1213 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1214 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1215 -o -name '.*.rej' -o -size 0 \
1216 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1217 -type f -print | xargs rm -f
1220 # Packaging of the kernel to various formats
1221 # ---------------------------------------------------------------------------
1222 # rpm target kept for backward compatibility
1223 package-dir := $(srctree)/scripts/package
1226 $(Q)$(MAKE) $(build)=$(package-dir) $@
1227 %pkg: include/config/kernel.release FORCE
1228 $(Q)$(MAKE) $(build)=$(package-dir) $@
1229 rpm: include/config/kernel.release FORCE
1230 $(Q)$(MAKE) $(build)=$(package-dir) $@
1233 # Brief documentation of the typical targets used
1234 # ---------------------------------------------------------------------------
1236 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/rk*_defconfig)
1237 boards := $(notdir $(boards))
1238 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1239 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1242 @echo 'Cleaning targets:'
1243 @echo ' clean - Remove most generated files but keep the config and'
1244 @echo ' enough build support to build external modules'
1245 @echo ' mrproper - Remove all generated files + config + various backup files'
1246 @echo ' distclean - mrproper + remove editor backup and patch files'
1248 @echo 'Configuration targets:'
1249 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1251 @echo 'Other generic targets:'
1252 @echo ' all - Build all targets marked with [*]'
1253 @echo '* vmlinux - Build the bare kernel'
1254 @echo '* modules - Build all modules'
1255 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1256 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1257 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1258 @echo ' dir/ - Build all files in dir and below'
1259 @echo ' dir/file.[oisS] - Build specified target only'
1260 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1261 @echo ' (requires a recent binutils and recent build (System.map))'
1262 @echo ' dir/file.ko - Build module including final link'
1263 @echo ' modules_prepare - Set up for building external modules'
1264 @echo ' tags/TAGS - Generate tags file for editors'
1265 @echo ' cscope - Generate cscope index'
1266 @echo ' gtags - Generate GNU GLOBAL index'
1267 @echo ' kernelrelease - Output the release version string'
1268 @echo ' kernelversion - Output the version stored in Makefile'
1269 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1270 echo ' (default: $(INSTALL_HDR_PATH))'; \
1272 @echo 'Static analysers'
1273 @echo ' checkstack - Generate a list of stack hogs'
1274 @echo ' namespacecheck - Name space analysis on compiled kernel'
1275 @echo ' versioncheck - Sanity check on version.h usage'
1276 @echo ' includecheck - Check for duplicate included header files'
1277 @echo ' export_report - List the usages of all exported symbols'
1278 @echo ' headers_check - Sanity check on exported headers'
1279 @echo ' headerdep - Detect inclusion cycles in headers'
1280 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1282 @echo 'Kernel packaging:'
1283 @$(MAKE) $(build)=$(package-dir) help
1285 @echo 'Documentation targets:'
1286 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1288 @echo 'Architecture specific targets ($(SRCARCH)):'
1289 @$(if $(archhelp),$(archhelp),\
1290 echo ' No architecture specific help defined for $(SRCARCH)')
1293 $(foreach b, $(boards), \
1294 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1296 @$(if $(board-dirs), \
1297 $(foreach b, $(board-dirs), \
1298 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1299 printf " %-16s - Show all of the above\\n" help-boards; \
1302 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1303 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1304 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1305 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1306 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1307 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1308 @echo ' 1: warnings which may be relevant and do not occur too often'
1309 @echo ' 2: warnings which occur quite often but may still be relevant'
1310 @echo ' 3: more obscure warnings, can most likely be ignored'
1311 @echo ' Multiple levels can be combined with W=12 or W=123'
1312 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1314 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1315 @echo 'For further info see the ./README file'
1318 help-board-dirs := $(addprefix help-,$(board-dirs))
1320 help-boards: $(help-board-dirs)
1322 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1324 $(help-board-dirs): help-%:
1325 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1326 @$(if $(boards-per-dir), \
1327 $(foreach b, $(boards-per-dir), \
1328 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1332 # Documentation targets
1333 # ---------------------------------------------------------------------------
1334 %docs: scripts_basic FORCE
1335 $(Q)$(MAKE) $(build)=scripts build_docproc
1336 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1338 else # KBUILD_EXTMOD
1341 # External module support.
1342 # When building external modules the kernel used as basis is considered
1343 # read-only, and no consistency checks are made and the make
1344 # system is not used on the basis kernel. If updates are required
1345 # in the basis kernel ordinary make commands (without M=...) must
1348 # The following are the only valid targets when building external
1350 # make M=dir clean Delete all automatically generated files
1351 # make M=dir modules Make all modules in specified dir
1352 # make M=dir Same as 'make M=dir modules'
1353 # make M=dir modules_install
1354 # Install the modules built in the module directory
1355 # Assumes install directory is already created
1357 # We are always building modules
1359 PHONY += crmodverdir
1363 PHONY += $(objtree)/Module.symvers
1364 $(objtree)/Module.symvers:
1365 @test -e $(objtree)/Module.symvers || ( \
1367 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1368 echo " is missing; modules will have no dependencies and modversions."; \
1371 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1372 PHONY += $(module-dirs) modules
1373 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1374 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1376 modules: $(module-dirs)
1377 @$(kecho) ' Building modules, stage 2.';
1378 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1380 PHONY += modules_install
1381 modules_install: _emodinst_ _emodinst_post
1383 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1386 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1387 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1389 PHONY += _emodinst_post
1390 _emodinst_post: _emodinst_
1393 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1395 PHONY += $(clean-dirs) clean
1397 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1399 clean: rm-dirs := $(MODVERDIR)
1400 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1403 @echo ' Building external modules.'
1404 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1406 @echo ' modules - default target, build the module(s)'
1407 @echo ' modules_install - install the module'
1408 @echo ' clean - remove generated files in module directory only'
1412 PHONY += prepare scripts
1415 endif # KBUILD_EXTMOD
1417 clean: $(clean-dirs)
1420 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1421 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1422 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1423 -o -name '*.symtypes' -o -name 'modules.order' \
1424 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1425 -o -name '*.gcno' \) -type f -print | xargs rm -f
1427 # Generate tags for editors
1428 # ---------------------------------------------------------------------------
1429 quiet_cmd_tags = GEN $@
1430 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1432 tags TAGS cscope gtags: FORCE
1435 # Scripts to check various things for consistency
1436 # ---------------------------------------------------------------------------
1438 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1441 find $(srctree)/* $(RCS_FIND_IGNORE) \
1442 -name '*.[hcS]' -type f -print | sort \
1443 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1446 find $(srctree)/* $(RCS_FIND_IGNORE) \
1447 -name '*.[hcS]' -type f -print | sort \
1448 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1451 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1454 $(PERL) $(srctree)/scripts/namespace.pl
1457 $(PERL) $(srctree)/scripts/export_report.pl
1459 endif #ifeq ($(config-targets),1)
1460 endif #ifeq ($(mixed-targets),1)
1462 PHONY += checkstack kernelrelease kernelversion
1464 # UML needs a little special treatment here. It wants to use the host
1465 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1466 # else wants $(ARCH), including people doing cross-builds, which means
1467 # that $(SUBARCH) doesn't work here.
1469 CHECKSTACK_ARCH := $(SUBARCH)
1471 CHECKSTACK_ARCH := $(ARCH)
1474 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1475 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1478 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1481 @echo $(KERNELVERSION)
1484 # ---------------------------------------------------------------------------
1485 # Single targets are compatible with:
1486 # - build with mixed source and output
1487 # - build with separate output dir 'make O=...'
1488 # - external modules
1490 # target-dir => where to store outputfile
1491 # build-dir => directory in kernel source tree to use
1493 ifeq ($(KBUILD_EXTMOD),)
1494 build-dir = $(patsubst %/,%,$(dir $@))
1495 target-dir = $(dir $@)
1497 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1498 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1499 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1502 %.s: %.c prepare scripts FORCE
1503 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1504 %.i: %.c prepare scripts FORCE
1505 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1506 %.o: %.c prepare scripts FORCE
1507 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1508 %.lst: %.c prepare scripts FORCE
1509 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1510 %.s: %.S prepare scripts FORCE
1511 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1512 %.o: %.S prepare scripts FORCE
1513 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1514 %.symtypes: %.c prepare scripts FORCE
1515 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1518 /: prepare scripts FORCE
1520 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1521 $(build)=$(build-dir)
1522 %/: prepare scripts FORCE
1524 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1525 $(build)=$(build-dir)
1526 %.ko: prepare scripts FORCE
1528 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1529 $(build)=$(build-dir) $(@:.ko=.o)
1530 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1532 # FIXME Should go into a make.lib or something
1533 # ===========================================================================
1535 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1536 cmd_rmdirs = rm -rf $(rm-dirs)
1538 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1539 cmd_rmfiles = rm -f $(rm-files)
1541 # Run depmod only if we have System.map and depmod is executable
1542 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1543 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1546 # Create temporary dir for module support files
1547 # clean it up only when building all modules
1548 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1549 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1551 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1552 $(KBUILD_AFLAGS_KERNEL) \
1553 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1554 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1556 quiet_cmd_as_o_S = AS $@
1557 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1559 # read all saved command lines
1561 targets := $(wildcard $(sort $(targets)))
1562 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1564 ifneq ($(cmd_files),)
1565 $(cmd_files): ; # Do not try to update included dependency files
1566 include $(cmd_files)
1569 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1571 # $(Q)$(MAKE) $(clean)=dir
1572 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1574 endif # skip-makefile
1579 # Declare the contents of the .PHONY variable as phony. We keep that
1580 # information in a variable so we can use it in if_changed and friends.
1584 %.o: %.uu prepare scripts FORCE
1585 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)