5 NAME = One Giant Leap for Frogkind
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 # Avoid interference with shell env settings
28 # We are using a recursive build, so we need to do a little thinking
29 # to get the ordering right.
31 # Most importantly: sub-Makefiles should only ever modify files in
32 # their own directory. If in some directory we have a dependency on
33 # a file in another dir (which doesn't happen often, but it's often
34 # unavoidable when linking the built-in.o targets which finally
35 # turn into vmlinux), we will call a sub make in that other dir, and
36 # after that we are sure that everything which is in that other dir
39 # The only cases where we need to modify files which have global
40 # effects are thus separated out and done before the recursive
41 # descending is started. They are now explicitly listed as the
44 # To put more focus on warnings, be less verbose as default
45 # Use 'make V=1' to see the full commands
47 ifeq ("$(origin V)", "command line")
54 # Call a source code checker (by default, "sparse") as part of the
57 # Use 'make C=1' to enable checking of only re-compiled files.
58 # Use 'make C=2' to enable checking of *all* source files, regardless
59 # of whether they are re-compiled or not.
61 # See the file "Documentation/sparse.txt" for more details, including
62 # where to get the "sparse" utility.
64 ifeq ("$(origin C)", "command line")
65 KBUILD_CHECKSRC = $(C)
67 ifndef KBUILD_CHECKSRC
71 # Use make M=dir to specify directory of external module to build
72 # Old syntax make ... SUBDIRS=$PWD is still supported
73 # Setting the environment variable KBUILD_EXTMOD take precedence
75 KBUILD_EXTMOD ?= $(SUBDIRS)
78 ifeq ("$(origin M)", "command line")
82 # kbuild supports saving output files in a separate directory.
83 # To locate output files in a separate directory two syntaxes are supported.
84 # In both cases the working directory must be the root of the kernel src.
86 # Use "make O=dir/to/store/output/files/"
88 # 2) Set KBUILD_OUTPUT
89 # Set the environment variable KBUILD_OUTPUT to point to the directory
90 # where the output files shall be placed.
91 # export KBUILD_OUTPUT=dir/to/store/output/files/
94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
98 # KBUILD_SRC is set on invocation of make in OBJ directory
99 # KBUILD_SRC is not intended to be used by the regular user (for now)
100 ifeq ($(KBUILD_SRC),)
102 # OK, Make called in directory where kernel src resides
103 # Do we want to locate output files in a separate directory?
104 ifeq ("$(origin O)", "command line")
105 KBUILD_OUTPUT := $(O)
108 ifeq ("$(origin W)", "command line")
109 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
112 # That's our default target when none is given on the command line
116 # Cancel implicit rules on top Makefile
117 $(CURDIR)/Makefile Makefile: ;
119 ifneq ($(KBUILD_OUTPUT),)
120 # Invoke a second make in the output directory, passing relevant variables
121 # check that the output directory actually exists
122 saved-output := $(KBUILD_OUTPUT)
123 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
124 $(if $(KBUILD_OUTPUT),, \
125 $(error output directory "$(saved-output)" does not exist))
127 PHONY += $(MAKECMDGOALS) sub-make
129 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
133 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
134 KBUILD_SRC=$(CURDIR) \
135 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
136 $(filter-out _all sub-make,$(MAKECMDGOALS))
138 # Leave processing to above invocation of make
140 endif # ifneq ($(KBUILD_OUTPUT),)
141 endif # ifeq ($(KBUILD_SRC),)
143 # We process the rest of the Makefile if this is the final invocation of make
144 ifeq ($(skip-makefile),)
146 # If building an external module we do not care about the all: rule
147 # but instead _all depend on modules
149 ifeq ($(KBUILD_EXTMOD),)
155 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
160 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
162 export srctree objtree VPATH
165 # SUBARCH tells the usermode build what the underlying arch is. That is set
166 # first, and if a usermode build is happening, the "ARCH=um" on the command
167 # line overrides the setting of ARCH below. If a native build is happening,
168 # then ARCH is assigned, getting whatever value it gets normally, and
169 # SUBARCH is subsequently ignored.
171 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
172 -e s/sun4u/sparc64/ \
173 -e s/arm.*/arm/ -e s/sa110/arm/ \
174 -e s/s390x/s390/ -e s/parisc64/parisc/ \
175 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
176 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
178 # Cross compiling and selecting different set of gcc/bin-utils
179 # ---------------------------------------------------------------------------
181 # When performing cross compilation for other architectures ARCH shall be set
182 # to the target architecture. (See arch/* for the possibilities).
183 # ARCH can be set during invocation of make:
185 # Another way is to have ARCH set in the environment.
186 # The default ARCH is the host where make is executed.
188 # CROSS_COMPILE specify the prefix used for all executables used
189 # during compilation. Only gcc and related bin-utils executables
190 # are prefixed with $(CROSS_COMPILE).
191 # CROSS_COMPILE can be set on the command line
192 # make CROSS_COMPILE=ia64-linux-
193 # Alternatively CROSS_COMPILE can be set in the environment.
194 # A third alternative is to store a setting in .config so that plain
195 # "make" in the configured kernel build directory always uses that.
196 # Default value for CROSS_COMPILE is not to prefix executables
197 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
199 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
201 # Architecture as present in compile.h
202 UTS_MACHINE := $(ARCH)
205 # Additional ARCH settings for x86
209 ifeq ($(ARCH),x86_64)
213 # Additional ARCH settings for sparc
214 ifeq ($(ARCH),sparc32)
217 ifeq ($(ARCH),sparc64)
221 # Additional ARCH settings for sh
226 # Additional ARCH settings for tile
227 ifeq ($(ARCH),tilepro)
230 ifeq ($(ARCH),tilegx)
234 # Where to locate arch specific headers
235 hdr-arch := $(SRCARCH)
237 KCONFIG_CONFIG ?= .config
238 export KCONFIG_CONFIG
240 # SHELL used by kbuild
241 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
242 else if [ -x /bin/bash ]; then echo /bin/bash; \
243 else echo sh; fi ; fi)
247 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
250 # Decide whether to build built-in, modular, or both.
251 # Normally, just do built-in.
256 # If we have only "make modules", don't compile built-in objects.
257 # When we're building modules with modversions, we need to consider
258 # the built-in objects during the descend as well, in order to
259 # make sure the checksums are up to date before we record them.
261 ifeq ($(MAKECMDGOALS),modules)
262 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
265 # If we have "make <whatever> modules", compile modules
266 # in addition to whatever we do anyway.
267 # Just "make" or "make all" shall build modules as well
269 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
273 ifeq ($(MAKECMDGOALS),)
277 export KBUILD_MODULES KBUILD_BUILTIN
278 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
281 # ---------------------------------------------------------------------------
283 # Normally, we echo the whole command before executing it. By making
284 # that echo $($(quiet)$(cmd)), we now have the possibility to set
285 # $(quiet) to choose other forms of output instead, e.g.
287 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
288 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
290 # If $(quiet) is empty, the whole command will be printed.
291 # If it is set to "quiet_", only the short version will be printed.
292 # If it is set to "silent_", nothing will be printed at all, since
293 # the variable $(silent_cmd_cc_o_c) doesn't exist.
295 # A simple variant is to prefix commands with $(Q) - that's useful
296 # for commands that shall be hidden in non-verbose mode.
300 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
301 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
303 ifeq ($(KBUILD_VERBOSE),1)
311 # If the user is running make -s (silent mode), suppress echoing of
314 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
318 export quiet Q KBUILD_VERBOSE
321 # Look for make include files relative to root of kernel src
322 MAKEFLAGS += --include-dir=$(srctree)
324 # We need some generic definitions (do not try to remake the file).
325 $(srctree)/scripts/Kbuild.include: ;
326 include $(srctree)/scripts/Kbuild.include
328 # Make variables (CC, etc...)
330 AS = $(CROSS_COMPILE)as
331 LD = $(CROSS_COMPILE)ld
332 CC = $(CROSS_COMPILE)gcc
334 AR = $(CROSS_COMPILE)ar
335 NM = $(CROSS_COMPILE)nm
336 STRIP = $(CROSS_COMPILE)strip
337 OBJCOPY = $(CROSS_COMPILE)objcopy
338 OBJDUMP = $(CROSS_COMPILE)objdump
340 GENKSYMS = scripts/genksyms/genksyms
341 INSTALLKERNEL := installkernel
342 DEPMOD = /sbin/depmod
346 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
347 -Wbitwise -Wno-return-void $(CF)
353 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
356 # Use USERINCLUDE when you must reference the UAPI directories only.
358 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
359 -Iarch/$(hdr-arch)/include/generated/uapi \
360 -I$(srctree)/include/uapi \
361 -Iinclude/generated/uapi \
362 -include $(srctree)/include/linux/kconfig.h
364 # Use LINUXINCLUDE when you must reference the include/ directory.
365 # Needed to be compatible with the O= option
367 -I$(srctree)/arch/$(hdr-arch)/include \
368 -Iarch/$(hdr-arch)/include/generated \
369 $(if $(KBUILD_SRC), -I$(srctree)/include) \
373 KBUILD_CPPFLAGS := -D__KERNEL__
375 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
376 -fno-strict-aliasing -fno-common \
377 -Werror-implicit-function-declaration \
378 -Wno-format-security \
379 -fno-delete-null-pointer-checks
380 KBUILD_AFLAGS_KERNEL :=
381 KBUILD_CFLAGS_KERNEL :=
382 KBUILD_AFLAGS := -D__ASSEMBLY__
383 KBUILD_AFLAGS_MODULE := -DMODULE
384 KBUILD_CFLAGS_MODULE := -DMODULE
385 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
387 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
388 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
389 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
391 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
392 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
393 export CPP AR NM STRIP OBJCOPY OBJDUMP
394 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
395 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
397 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
398 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
399 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
400 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
401 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
402 export KBUILD_ARFLAGS
404 # When compiling out-of-tree modules, put MODVERDIR in the module
405 # tree rather than in the kernel tree. The kernel tree might
407 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
409 # Files to ignore in find ... statements
411 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
412 -o -name .pc -o -name .hg -o -name .git \) -prune -o
413 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
414 --exclude CVS --exclude .pc --exclude .hg --exclude .git
416 # ===========================================================================
417 # Rules shared between *config targets and build targets
419 # Basic helpers built in scripts/
420 PHONY += scripts_basic
422 $(Q)$(MAKE) $(build)=scripts/basic
423 $(Q)rm -f .tmp_quiet_recordmcount
425 # To avoid any implicit rule to kick in, define an empty command.
426 scripts/basic/%: scripts_basic ;
428 PHONY += outputmakefile
429 # outputmakefile generates a Makefile in the output directory, if using a
430 # separate output directory. This allows convenient use of make in the
433 ifneq ($(KBUILD_SRC),)
434 $(Q)ln -fsn $(srctree) source
435 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
436 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
439 # Support for using generic headers in asm-generic
442 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
443 src=asm obj=arch/$(SRCARCH)/include/generated/asm
444 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
445 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
447 # To make sure we do not include .config for any of the *config targets
448 # catch them early, and hand them over to scripts/kconfig/Makefile
449 # It is allowed to specify more targets when calling make, including
450 # mixing *config targets and build targets.
451 # For example 'make oldconfig all'.
452 # Detect when mixed targets is specified, and make a second invocation
453 # of make so .config is not included in this case either (for *config).
455 version_h := include/generated/uapi/linux/version.h
457 no-dot-config-targets := clean mrproper distclean \
458 cscope gtags TAGS tags help %docs check% coccicheck \
459 $(version_h) headers_% archheaders archscripts \
460 kernelversion %src-pkg
466 ifneq ($(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 \
521 $(Q)$(MAKE) $(build)=$(@)
523 # Objects we will link into vmlinux / subdirs we need to visit
525 drivers-y := drivers/ sound/ firmware/
529 endif # KBUILD_EXTMOD
531 ifeq ($(dot-config),1)
533 -include include/config/auto.conf
535 ifeq ($(KBUILD_EXTMOD),)
536 # Read in dependencies to all Kconfig* files, make sure to run
537 # oldconfig if changes are detected.
538 -include include/config/auto.conf.cmd
540 # To avoid any implicit rule to kick in, define an empty command
541 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
543 # If .config is newer than include/config/auto.conf, someone tinkered
544 # with it and forgot to run make oldconfig.
545 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
546 # we execute the config step to be sure to catch updated Kconfig files
547 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
548 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
550 # external modules needs include/generated/autoconf.h and include/config/auto.conf
551 # but do not care if they are up-to-date. Use auto.conf to trigger the test
552 PHONY += include/config/auto.conf
554 include/config/auto.conf:
555 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
557 echo >&2 " ERROR: Kernel configuration is invalid."; \
558 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
559 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
563 endif # KBUILD_EXTMOD
566 # Dummy target needed, because used as prerequisite
567 include/config/auto.conf: ;
568 endif # $(dot-config)
570 # The all: target is the default when no target is given on the
572 # This allow a user to issue only 'make' to build a kernel including modules
573 # Defaults to vmlinux, but the arch makefile usually adds further targets
576 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
577 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
582 include $(srctree)/arch/$(SRCARCH)/Makefile
584 ifdef CONFIG_READABLE_ASM
585 # Disable optimizations that make assembler listings hard to read.
586 # reorder blocks reorders the control in the function
587 # ipa clone creates specialized cloned functions
588 # partial inlining inlines only parts of functions
589 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
590 $(call cc-option,-fno-ipa-cp-clone,) \
591 $(call cc-option,-fno-partial-inlining)
594 ifneq ($(CONFIG_FRAME_WARN),0)
595 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
598 # Force gcc to behave correct even for buggy distributions
599 ifndef CONFIG_CC_STACKPROTECTOR
600 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
603 # This warning generated too much noise in a regular build.
604 # Use make W=1 to enable this warning (see scripts/Makefile.build)
605 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
607 ifdef CONFIG_FRAME_POINTER
608 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
610 # Some targets (ARM with Thumb2, for example), can't be built with frame
611 # pointers. For those, we don't have FUNCTION_TRACER automatically
612 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
613 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
614 # -fomit-frame-pointer with FUNCTION_TRACER.
615 ifndef CONFIG_FUNCTION_TRACER
616 KBUILD_CFLAGS += -fomit-frame-pointer
620 ifdef CONFIG_DEBUG_INFO
622 KBUILD_AFLAGS += -gdwarf-2
625 ifdef CONFIG_DEBUG_INFO_REDUCED
626 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
627 $(call cc-option,-fno-var-tracking)
630 ifdef CONFIG_FUNCTION_TRACER
631 ifdef CONFIG_HAVE_FENTRY
632 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
634 KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
635 KBUILD_AFLAGS += $(CC_USING_FENTRY)
636 ifdef CONFIG_DYNAMIC_FTRACE
637 ifdef CONFIG_HAVE_C_RECORDMCOUNT
638 BUILD_C_RECORDMCOUNT := y
639 export BUILD_C_RECORDMCOUNT
644 # We trigger additional mismatches with less inlining
645 ifdef CONFIG_DEBUG_SECTION_MISMATCH
646 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
649 # arch Makefile may override CC so keep this after arch Makefile is included
650 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
651 CHECKFLAGS += $(NOSTDINC_FLAGS)
653 # warn about C99 declaration after statement
654 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
656 # disable pointer signed / unsigned warnings in gcc 4.0
657 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
659 # disable invalid "can't wrap" optimizations for signed / pointers
660 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
662 # conserve stack if available
663 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
665 # disallow errors like 'EXPORT_GPL(foo);' with missing header
666 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
668 # require functions to have arguments in prototypes, not empty 'int foo()'
669 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
671 # use the deterministic mode of AR if available
672 KBUILD_ARFLAGS := $(call ar-option,D)
674 # check for 'asm goto'
675 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
676 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
679 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
680 KBUILD_CPPFLAGS += $(KCPPFLAGS)
681 KBUILD_AFLAGS += $(KAFLAGS)
682 KBUILD_CFLAGS += $(KCFLAGS)
684 # Use --build-id when available.
685 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
686 $(call cc-ldoption, -Wl$(comma)--build-id,))
687 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
688 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
690 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
691 LDFLAGS_vmlinux += $(call ld-option, -X,)
694 # Default kernel image to build when no specific target is given.
695 # KBUILD_IMAGE may be overruled on the command line or
696 # set in the environment
697 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
699 export KBUILD_IMAGE ?= vmlinux
702 # INSTALL_PATH specifies where to place the updated kernel and system map
703 # images. Default is /boot, but you can set it to other values
704 export INSTALL_PATH ?= /boot
707 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
708 # relocations required by build roots. This is not defined in the
709 # makefile but the argument can be passed to make if needed.
712 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
716 # INSTALL_MOD_STRIP, if defined, will cause modules to be
717 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
718 # the default option --strip-debug will be used. Otherwise,
719 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
721 ifdef INSTALL_MOD_STRIP
722 ifeq ($(INSTALL_MOD_STRIP),1)
723 mod_strip_cmd = $(STRIP) --strip-debug
725 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
726 endif # INSTALL_MOD_STRIP=1
729 endif # INSTALL_MOD_STRIP
732 # Select initial ramdisk compression format, default is gzip(1).
733 # This shall be used by the dracut(8) tool while creating an initramfs image.
735 INITRD_COMPRESS-y := gzip
736 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
737 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
738 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
739 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
740 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
741 # do not export INITRD_COMPRESS, since we didn't actually
742 # choose a sane default compression above.
743 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
745 ifdef CONFIG_MODULE_SIG_ALL
746 MODSECKEY = ./signing_key.priv
747 MODPUBKEY = ./signing_key.x509
749 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
756 ifeq ($(KBUILD_EXTMOD),)
757 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
759 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
760 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
761 $(net-y) $(net-m) $(libs-y) $(libs-m)))
763 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
765 $(core-n) $(core-) $(drivers-n) $(drivers-) \
766 $(net-n) $(net-) $(libs-n) $(libs-))))
768 init-y := $(patsubst %/, %/built-in.o, $(init-y))
769 core-y := $(patsubst %/, %/built-in.o, $(core-y))
770 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
771 net-y := $(patsubst %/, %/built-in.o, $(net-y))
772 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
773 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
774 libs-y := $(libs-y1) $(libs-y2)
776 # Externally visible symbols (used by link-vmlinux.sh)
777 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
778 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
779 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
780 export LDFLAGS_vmlinux
781 # used by scripts/pacmage/Makefile
782 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
784 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
786 # Final link of vmlinux
787 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
788 quiet_cmd_link-vmlinux = LINK $@
790 # Include targets which we want to
791 # execute if the rest of the kernel build went well.
792 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
793 ifdef CONFIG_HEADERS_CHECK
794 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
797 $(Q)$(MAKE) $(build)=samples
799 ifdef CONFIG_BUILD_DOCSRC
800 $(Q)$(MAKE) $(build)=Documentation
802 +$(call if_changed,link-vmlinux)
804 # The actual objects are generated when descending,
805 # make sure no implicit rule kicks in
806 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
808 # Handle descending into subdirectories listed in $(vmlinux-dirs)
809 # Preset locale variables to speed up the build process. Limit locale
810 # tweaks to this spot to avoid wrong language settings when running
811 # make menuconfig etc.
812 # Error messages still appears in the original language
814 PHONY += $(vmlinux-dirs)
815 $(vmlinux-dirs): prepare scripts
816 $(Q)$(MAKE) $(build)=$@
818 define filechk_kernel.release
819 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
822 # Store (new) KERNELRELEASE string in include/config/kernel.release
823 include/config/kernel.release: include/config/auto.conf FORCE
824 $(call filechk,kernel.release)
827 # Things we need to do before we recursively start building the kernel
828 # or the modules are listed in "prepare".
829 # A multi level approach is used. prepareN is processed before prepareN-1.
830 # archprepare is used in arch Makefiles and when processed asm symlink,
831 # version.h and scripts_basic is processed / created.
833 # Listed in dependency order
834 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
836 # prepare3 is used to check if we are building in a separate output directory,
838 # 1) Check that make has not been executed in the kernel src $(srctree)
839 prepare3: include/config/kernel.release
840 ifneq ($(KBUILD_SRC),)
841 @$(kecho) ' Using $(srctree) as source for kernel'
842 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
843 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
844 echo >&2 " in the '$(srctree)' directory.";\
849 # prepare2 creates a makefile if using a separate output directory
850 prepare2: prepare3 outputmakefile asm-generic
852 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
853 include/config/auto.conf
856 archprepare: archheaders archscripts prepare1 scripts_basic
858 prepare0: archprepare FORCE
859 $(Q)$(MAKE) $(build)=.
861 # All the preparing..
864 # Generate some files
865 # ---------------------------------------------------------------------------
867 # KERNELRELEASE can change from a few different places, meaning version.h
868 # needs to be updated, so this check is forced on all builds
871 define filechk_utsrelease.h
872 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
873 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
876 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
879 define filechk_version.h
880 (echo \#define LINUX_VERSION_CODE $(shell \
881 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
882 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
885 $(version_h): $(srctree)/Makefile FORCE
886 $(call filechk,version.h)
888 include/generated/utsrelease.h: include/config/kernel.release FORCE
889 $(call filechk,utsrelease.h)
893 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
894 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
896 # ---------------------------------------------------------------------------
900 @echo '*** Warning: make $@ is unnecessary now.'
902 # ---------------------------------------------------------------------------
904 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
905 export INSTALL_FW_PATH
907 PHONY += firmware_install
908 firmware_install: FORCE
909 @mkdir -p $(objtree)/firmware
910 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
912 # ---------------------------------------------------------------------------
915 #Default location for installed headers
916 export INSTALL_HDR_PATH = $(objtree)/usr
918 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
920 # If we do an all arch process set dst to asm-$(hdr-arch)
921 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
930 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
931 $(Q)$(MAKE) $(build)=scripts build_unifdef
933 PHONY += headers_install_all
935 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
937 PHONY += headers_install
938 headers_install: __headers
939 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
940 $(error Headers not exportable for the $(SRCARCH) architecture))
941 $(Q)$(MAKE) $(hdr-inst)=include/uapi
942 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
944 PHONY += headers_check_all
945 headers_check_all: headers_install_all
946 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
948 PHONY += headers_check
949 headers_check: headers_install
950 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
951 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
953 # ---------------------------------------------------------------------------
958 # By default, build modules as well
964 # A module can be listed more than once in obj-m resulting in
965 # duplicate lines in modules.order files. Those are removed
966 # using awk while concatenating to the final file.
969 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
970 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
971 @$(kecho) ' Building modules, stage 2.';
972 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
973 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
975 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
976 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
978 %/modules.builtin: include/config/auto.conf
979 $(Q)$(MAKE) $(modbuiltin)=$*
982 # Target to prepare building external modules
983 PHONY += modules_prepare
984 modules_prepare: prepare scripts
986 # Target to install modules
987 PHONY += modules_install
988 modules_install: _modinst_ _modinst_post
992 @rm -rf $(MODLIB)/kernel
993 @rm -f $(MODLIB)/source
994 @mkdir -p $(MODLIB)/kernel
995 @ln -s $(srctree) $(MODLIB)/source
996 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
997 rm -f $(MODLIB)/build ; \
998 ln -s $(objtree) $(MODLIB)/build ; \
1000 @cp -f $(objtree)/modules.order $(MODLIB)/
1001 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1002 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1004 # This depmod is only for convenience to give the initial
1005 # boot a modules.dep even before / is mounted read-write. However the
1006 # boot script depmod is the master version.
1007 PHONY += _modinst_post
1008 _modinst_post: _modinst_
1009 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1012 ifeq ($(CONFIG_MODULE_SIG), y)
1013 PHONY += modules_sign
1015 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1018 else # CONFIG_MODULES
1020 # Modules not configured
1021 # ---------------------------------------------------------------------------
1023 modules modules_install: FORCE
1025 @echo >&2 "The present kernel configuration has modules disabled."
1026 @echo >&2 "Type 'make config' and enable loadable module support."
1027 @echo >&2 "Then build a kernel with module support enabled."
1031 endif # CONFIG_MODULES
1034 # Cleaning is done on three levels.
1035 # make clean Delete most generated files
1036 # Leave enough to build external modules
1037 # make mrproper Delete the current configuration, and all generated files
1038 # make distclean Remove editor backup files, patch leftover files and the like
1040 # Directories & files removed with 'make clean'
1041 CLEAN_DIRS += $(MODVERDIR)
1043 # Directories & files removed with 'make mrproper'
1044 MRPROPER_DIRS += include/config usr/include include/generated \
1045 arch/*/include/generated
1046 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1047 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1048 signing_key.priv signing_key.x509 x509.genkey \
1049 extra_certificates signing_key.x509.keyid \
1050 signing_key.x509.signer
1052 # clean - Delete most, but leave enough to build external modules
1054 clean: rm-dirs := $(CLEAN_DIRS)
1055 clean: rm-files := $(CLEAN_FILES)
1056 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1058 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1060 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1063 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1065 clean: archclean vmlinuxclean
1067 # mrproper - Delete all generated files, including .config
1069 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1070 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1071 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1073 PHONY += $(mrproper-dirs) mrproper archmrproper
1075 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1077 mrproper: clean archmrproper $(mrproper-dirs)
1086 @find $(srctree) $(RCS_FIND_IGNORE) \
1087 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1088 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1090 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1091 -type f -print | xargs rm -f
1094 # Packaging of the kernel to various formats
1095 # ---------------------------------------------------------------------------
1096 # rpm target kept for backward compatibility
1097 package-dir := $(srctree)/scripts/package
1100 $(Q)$(MAKE) $(build)=$(package-dir) $@
1101 %pkg: include/config/kernel.release FORCE
1102 $(Q)$(MAKE) $(build)=$(package-dir) $@
1103 rpm: include/config/kernel.release FORCE
1104 $(Q)$(MAKE) $(build)=$(package-dir) $@
1107 # Brief documentation of the typical targets used
1108 # ---------------------------------------------------------------------------
1110 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1111 boards := $(notdir $(boards))
1112 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1113 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1116 @echo 'Cleaning targets:'
1117 @echo ' clean - Remove most generated files but keep the config and'
1118 @echo ' enough build support to build external modules'
1119 @echo ' mrproper - Remove all generated files + config + various backup files'
1120 @echo ' distclean - mrproper + remove editor backup and patch files'
1122 @echo 'Configuration targets:'
1123 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1125 @echo 'Other generic targets:'
1126 @echo ' all - Build all targets marked with [*]'
1127 @echo '* vmlinux - Build the bare kernel'
1128 @echo '* modules - Build all modules'
1129 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1130 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1131 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1132 @echo ' dir/ - Build all files in dir and below'
1133 @echo ' dir/file.[oisS] - Build specified target only'
1134 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1135 @echo ' (requires a recent binutils and recent build (System.map))'
1136 @echo ' dir/file.ko - Build module including final link'
1137 @echo ' modules_prepare - Set up for building external modules'
1138 @echo ' tags/TAGS - Generate tags file for editors'
1139 @echo ' cscope - Generate cscope index'
1140 @echo ' gtags - Generate GNU GLOBAL index'
1141 @echo ' kernelrelease - Output the release version string'
1142 @echo ' kernelversion - Output the version stored in Makefile'
1143 @echo ' image_name - Output the image name'
1144 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1145 echo ' (default: $(INSTALL_HDR_PATH))'; \
1147 @echo 'Static analysers'
1148 @echo ' checkstack - Generate a list of stack hogs'
1149 @echo ' namespacecheck - Name space analysis on compiled kernel'
1150 @echo ' versioncheck - Sanity check on version.h usage'
1151 @echo ' includecheck - Check for duplicate included header files'
1152 @echo ' export_report - List the usages of all exported symbols'
1153 @echo ' headers_check - Sanity check on exported headers'
1154 @echo ' headerdep - Detect inclusion cycles in headers'
1155 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1157 @echo 'Kernel packaging:'
1158 @$(MAKE) $(build)=$(package-dir) help
1160 @echo 'Documentation targets:'
1161 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1163 @echo 'Architecture specific targets ($(SRCARCH)):'
1164 @$(if $(archhelp),$(archhelp),\
1165 echo ' No architecture specific help defined for $(SRCARCH)')
1168 $(foreach b, $(boards), \
1169 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1171 @$(if $(board-dirs), \
1172 $(foreach b, $(board-dirs), \
1173 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1174 printf " %-16s - Show all of the above\\n" help-boards; \
1177 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1178 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1179 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1180 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1181 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1182 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1183 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1184 @echo ' 1: warnings which may be relevant and do not occur too often'
1185 @echo ' 2: warnings which occur quite often but may still be relevant'
1186 @echo ' 3: more obscure warnings, can most likely be ignored'
1187 @echo ' Multiple levels can be combined with W=12 or W=123'
1189 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1190 @echo 'For further info see the ./README file'
1193 help-board-dirs := $(addprefix help-,$(board-dirs))
1195 help-boards: $(help-board-dirs)
1197 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1199 $(help-board-dirs): help-%:
1200 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1201 @$(if $(boards-per-dir), \
1202 $(foreach b, $(boards-per-dir), \
1203 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1207 # Documentation targets
1208 # ---------------------------------------------------------------------------
1209 %docs: scripts_basic FORCE
1210 $(Q)$(MAKE) $(build)=scripts build_docproc
1211 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1213 else # KBUILD_EXTMOD
1216 # External module support.
1217 # When building external modules the kernel used as basis is considered
1218 # read-only, and no consistency checks are made and the make
1219 # system is not used on the basis kernel. If updates are required
1220 # in the basis kernel ordinary make commands (without M=...) must
1223 # The following are the only valid targets when building external
1225 # make M=dir clean Delete all automatically generated files
1226 # make M=dir modules Make all modules in specified dir
1227 # make M=dir Same as 'make M=dir modules'
1228 # make M=dir modules_install
1229 # Install the modules built in the module directory
1230 # Assumes install directory is already created
1232 # We are always building modules
1234 PHONY += crmodverdir
1238 PHONY += $(objtree)/Module.symvers
1239 $(objtree)/Module.symvers:
1240 @test -e $(objtree)/Module.symvers || ( \
1242 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1243 echo " is missing; modules will have no dependencies and modversions."; \
1246 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1247 PHONY += $(module-dirs) modules
1248 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1249 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1251 modules: $(module-dirs)
1252 @$(kecho) ' Building modules, stage 2.';
1253 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1255 PHONY += modules_install
1256 modules_install: _emodinst_ _emodinst_post
1258 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1261 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1262 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1264 PHONY += _emodinst_post
1265 _emodinst_post: _emodinst_
1268 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1270 PHONY += $(clean-dirs) clean
1272 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1274 clean: rm-dirs := $(MODVERDIR)
1275 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1278 @echo ' Building external modules.'
1279 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1281 @echo ' modules - default target, build the module(s)'
1282 @echo ' modules_install - install the module'
1283 @echo ' clean - remove generated files in module directory only'
1287 PHONY += prepare scripts
1290 endif # KBUILD_EXTMOD
1292 clean: $(clean-dirs)
1295 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1296 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1298 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1299 -o -name '*.symtypes' -o -name 'modules.order' \
1300 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1301 -o -name '*.gcno' \) -type f -print | xargs rm -f
1303 # Generate tags for editors
1304 # ---------------------------------------------------------------------------
1305 quiet_cmd_tags = GEN $@
1306 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1308 tags TAGS cscope gtags: FORCE
1311 # Scripts to check various things for consistency
1312 # ---------------------------------------------------------------------------
1314 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1317 find $(srctree)/* $(RCS_FIND_IGNORE) \
1318 -name '*.[hcS]' -type f -print | sort \
1319 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1322 find $(srctree)/* $(RCS_FIND_IGNORE) \
1323 -name '*.[hcS]' -type f -print | sort \
1324 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1327 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1330 $(PERL) $(srctree)/scripts/namespace.pl
1333 $(PERL) $(srctree)/scripts/export_report.pl
1335 endif #ifeq ($(config-targets),1)
1336 endif #ifeq ($(mixed-targets),1)
1338 PHONY += checkstack kernelrelease kernelversion image_name
1340 # UML needs a little special treatment here. It wants to use the host
1341 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1342 # else wants $(ARCH), including people doing cross-builds, which means
1343 # that $(SUBARCH) doesn't work here.
1345 CHECKSTACK_ARCH := $(SUBARCH)
1347 CHECKSTACK_ARCH := $(ARCH)
1350 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1351 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1354 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1357 @echo $(KERNELVERSION)
1360 @echo $(KBUILD_IMAGE)
1362 # Clear a bunch of variables before executing the submake
1364 $(Q)mkdir -p $(objtree)/tools
1365 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1368 $(Q)mkdir -p $(objtree)/tools
1369 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1372 # ---------------------------------------------------------------------------
1373 # Single targets are compatible with:
1374 # - build with mixed source and output
1375 # - build with separate output dir 'make O=...'
1376 # - external modules
1378 # target-dir => where to store outputfile
1379 # build-dir => directory in kernel source tree to use
1381 ifeq ($(KBUILD_EXTMOD),)
1382 build-dir = $(patsubst %/,%,$(dir $@))
1383 target-dir = $(dir $@)
1385 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1386 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1387 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1390 %.s: %.c prepare scripts FORCE
1391 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1392 %.i: %.c prepare scripts FORCE
1393 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1394 %.o: %.c prepare scripts FORCE
1395 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1396 %.lst: %.c prepare scripts FORCE
1397 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1398 %.s: %.S prepare scripts FORCE
1399 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1400 %.o: %.S prepare scripts FORCE
1401 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1402 %.symtypes: %.c prepare scripts FORCE
1403 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1406 /: prepare scripts FORCE
1408 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1409 $(build)=$(build-dir)
1410 %/: prepare scripts FORCE
1412 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1413 $(build)=$(build-dir)
1414 %.ko: prepare scripts FORCE
1416 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1417 $(build)=$(build-dir) $(@:.ko=.o)
1418 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1420 # FIXME Should go into a make.lib or something
1421 # ===========================================================================
1423 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1424 cmd_rmdirs = rm -rf $(rm-dirs)
1426 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1427 cmd_rmfiles = rm -f $(rm-files)
1429 # Run depmod only if we have System.map and depmod is executable
1430 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1431 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1432 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1434 # Create temporary dir for module support files
1435 # clean it up only when building all modules
1436 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1437 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1439 # read all saved command lines
1441 targets := $(wildcard $(sort $(targets)))
1442 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1444 ifneq ($(cmd_files),)
1445 $(cmd_files): ; # Do not try to update included dependency files
1446 include $(cmd_files)
1449 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1451 # $(Q)$(MAKE) $(clean)=dir
1452 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1454 endif # skip-makefile
1459 # Declare the contents of the .PHONY variable as phony. We keep that
1460 # information in a variable so we can use it in if_changed and friends.