5 NAME = Shuffling Zombie Juror
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 mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
125 $(if $(KBUILD_OUTPUT),, \
126 $(error failed to create output directory "$(saved-output)"))
128 PHONY += $(MAKECMDGOALS) sub-make
130 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
134 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
135 KBUILD_SRC=$(CURDIR) \
136 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
137 $(filter-out _all sub-make,$(MAKECMDGOALS))
139 # Leave processing to above invocation of make
141 endif # ifneq ($(KBUILD_OUTPUT),)
142 endif # ifeq ($(KBUILD_SRC),)
144 # We process the rest of the Makefile if this is the final invocation of make
145 ifeq ($(skip-makefile),)
147 # If building an external module we do not care about the all: rule
148 # but instead _all depend on modules
150 ifeq ($(KBUILD_EXTMOD),)
156 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
161 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
163 export srctree objtree VPATH
166 # SUBARCH tells the usermode build what the underlying arch is. That is set
167 # first, and if a usermode build is happening, the "ARCH=um" on the command
168 # line overrides the setting of ARCH below. If a native build is happening,
169 # then ARCH is assigned, getting whatever value it gets normally, and
170 # SUBARCH is subsequently ignored.
172 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
173 -e s/sun4u/sparc64/ \
174 -e s/arm.*/arm/ -e s/sa110/arm/ \
175 -e s/s390x/s390/ -e s/parisc64/parisc/ \
176 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
177 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
179 # Cross compiling and selecting different set of gcc/bin-utils
180 # ---------------------------------------------------------------------------
182 # When performing cross compilation for other architectures ARCH shall be set
183 # to the target architecture. (See arch/* for the possibilities).
184 # ARCH can be set during invocation of make:
186 # Another way is to have ARCH set in the environment.
187 # The default ARCH is the host where make is executed.
189 # CROSS_COMPILE specify the prefix used for all executables used
190 # during compilation. Only gcc and related bin-utils executables
191 # are prefixed with $(CROSS_COMPILE).
192 # CROSS_COMPILE can be set on the command line
193 # make CROSS_COMPILE=ia64-linux-
194 # Alternatively CROSS_COMPILE can be set in the environment.
195 # A third alternative is to store a setting in .config so that plain
196 # "make" in the configured kernel build directory always uses that.
197 # Default value for CROSS_COMPILE is not to prefix executables
198 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
200 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
202 # Architecture as present in compile.h
203 UTS_MACHINE := $(ARCH)
206 # Additional ARCH settings for x86
210 ifeq ($(ARCH),x86_64)
214 # Additional ARCH settings for sparc
215 ifeq ($(ARCH),sparc32)
218 ifeq ($(ARCH),sparc64)
222 # Additional ARCH settings for sh
227 # Additional ARCH settings for tile
228 ifeq ($(ARCH),tilepro)
231 ifeq ($(ARCH),tilegx)
235 # Where to locate arch specific headers
236 hdr-arch := $(SRCARCH)
238 KCONFIG_CONFIG ?= .config
239 export KCONFIG_CONFIG
241 # SHELL used by kbuild
242 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
243 else if [ -x /bin/bash ]; then echo /bin/bash; \
244 else echo sh; fi ; fi)
248 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
251 # Decide whether to build built-in, modular, or both.
252 # Normally, just do built-in.
257 # If we have only "make modules", don't compile built-in objects.
258 # When we're building modules with modversions, we need to consider
259 # the built-in objects during the descend as well, in order to
260 # make sure the checksums are up to date before we record them.
262 ifeq ($(MAKECMDGOALS),modules)
263 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
266 # If we have "make <whatever> modules", compile modules
267 # in addition to whatever we do anyway.
268 # Just "make" or "make all" shall build modules as well
270 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
274 ifeq ($(MAKECMDGOALS),)
278 export KBUILD_MODULES KBUILD_BUILTIN
279 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
282 # ---------------------------------------------------------------------------
284 # Normally, we echo the whole command before executing it. By making
285 # that echo $($(quiet)$(cmd)), we now have the possibility to set
286 # $(quiet) to choose other forms of output instead, e.g.
288 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
289 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
291 # If $(quiet) is empty, the whole command will be printed.
292 # If it is set to "quiet_", only the short version will be printed.
293 # If it is set to "silent_", nothing will be printed at all, since
294 # the variable $(silent_cmd_cc_o_c) doesn't exist.
296 # A simple variant is to prefix commands with $(Q) - that's useful
297 # for commands that shall be hidden in non-verbose mode.
301 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
302 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
304 ifeq ($(KBUILD_VERBOSE),1)
312 # If the user is running make -s (silent mode), suppress echoing of
315 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
316 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
320 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
325 export quiet Q KBUILD_VERBOSE
328 # Look for make include files relative to root of kernel src
329 MAKEFLAGS += --include-dir=$(srctree)
331 # We need some generic definitions (do not try to remake the file).
332 $(srctree)/scripts/Kbuild.include: ;
333 include $(srctree)/scripts/Kbuild.include
335 # Make variables (CC, etc...)
337 AS = $(CROSS_COMPILE)as
338 LD = $(CROSS_COMPILE)ld
339 CC = $(CROSS_COMPILE)gcc
341 AR = $(CROSS_COMPILE)ar
342 NM = $(CROSS_COMPILE)nm
343 STRIP = $(CROSS_COMPILE)strip
344 OBJCOPY = $(CROSS_COMPILE)objcopy
345 OBJDUMP = $(CROSS_COMPILE)objdump
347 GENKSYMS = scripts/genksyms/genksyms
348 INSTALLKERNEL := installkernel
349 DEPMOD = /sbin/depmod
353 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
354 -Wbitwise -Wno-return-void $(CF)
360 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
363 # Use USERINCLUDE when you must reference the UAPI directories only.
365 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
366 -Iarch/$(hdr-arch)/include/generated/uapi \
367 -I$(srctree)/include/uapi \
368 -Iinclude/generated/uapi \
369 -include $(srctree)/include/linux/kconfig.h
371 # Use LINUXINCLUDE when you must reference the include/ directory.
372 # Needed to be compatible with the O= option
374 -I$(srctree)/arch/$(hdr-arch)/include \
375 -Iarch/$(hdr-arch)/include/generated \
376 $(if $(KBUILD_SRC), -I$(srctree)/include) \
380 KBUILD_CPPFLAGS := -D__KERNEL__
382 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
383 -fno-strict-aliasing -fno-common \
384 -Werror-implicit-function-declaration \
385 -Wno-format-security \
386 -fno-delete-null-pointer-checks
387 KBUILD_AFLAGS_KERNEL :=
388 KBUILD_CFLAGS_KERNEL :=
389 KBUILD_AFLAGS := -D__ASSEMBLY__
390 KBUILD_AFLAGS_MODULE := -DMODULE
391 KBUILD_CFLAGS_MODULE := -DMODULE
392 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
394 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
395 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
396 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
398 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
399 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
400 export CPP AR NM STRIP OBJCOPY OBJDUMP
401 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
402 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
404 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
405 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
406 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
407 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
408 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
409 export KBUILD_ARFLAGS
411 # When compiling out-of-tree modules, put MODVERDIR in the module
412 # tree rather than in the kernel tree. The kernel tree might
414 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
416 # Files to ignore in find ... statements
418 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
419 -o -name .pc -o -name .hg -o -name .git \) -prune -o
420 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
421 --exclude CVS --exclude .pc --exclude .hg --exclude .git
423 # ===========================================================================
424 # Rules shared between *config targets and build targets
426 # Basic helpers built in scripts/
427 PHONY += scripts_basic
429 $(Q)$(MAKE) $(build)=scripts/basic
430 $(Q)rm -f .tmp_quiet_recordmcount
432 # To avoid any implicit rule to kick in, define an empty command.
433 scripts/basic/%: scripts_basic ;
435 PHONY += outputmakefile
436 # outputmakefile generates a Makefile in the output directory, if using a
437 # separate output directory. This allows convenient use of make in the
440 ifneq ($(KBUILD_SRC),)
441 $(Q)ln -fsn $(srctree) source
442 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
443 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
446 # Support for using generic headers in asm-generic
449 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
450 src=asm obj=arch/$(SRCARCH)/include/generated/asm
451 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
452 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
454 # To make sure we do not include .config for any of the *config targets
455 # catch them early, and hand them over to scripts/kconfig/Makefile
456 # It is allowed to specify more targets when calling make, including
457 # mixing *config targets and build targets.
458 # For example 'make oldconfig all'.
459 # Detect when mixed targets is specified, and make a second invocation
460 # of make so .config is not included in this case either (for *config).
462 version_h := include/generated/uapi/linux/version.h
464 no-dot-config-targets := clean mrproper distclean \
465 cscope gtags TAGS tags help %docs check% coccicheck \
466 $(version_h) headers_% archheaders archscripts \
467 kernelversion %src-pkg
473 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
474 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
479 ifeq ($(KBUILD_EXTMOD),)
480 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
482 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
488 ifeq ($(mixed-targets),1)
489 # ===========================================================================
490 # We're called with mixed targets (*config and build targets).
491 # Handle them one by one.
494 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
497 ifeq ($(config-targets),1)
498 # ===========================================================================
499 # *config targets only - make sure prerequisites are updated, and descend
500 # in scripts/kconfig to make the *config target
502 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
503 # KBUILD_DEFCONFIG may point out an alternative default configuration
504 # used for 'make defconfig'
505 include $(srctree)/arch/$(SRCARCH)/Makefile
506 export KBUILD_DEFCONFIG KBUILD_KCONFIG
508 config: scripts_basic outputmakefile FORCE
509 $(Q)mkdir -p include/linux include/config
510 $(Q)$(MAKE) $(build)=scripts/kconfig $@
512 %config: scripts_basic outputmakefile FORCE
513 $(Q)mkdir -p include/linux include/config
514 $(Q)$(MAKE) $(build)=scripts/kconfig $@
517 # ===========================================================================
518 # Build targets only - this includes vmlinux, arch specific targets, clean
519 # targets and others. In general all targets except *config targets.
521 ifeq ($(KBUILD_EXTMOD),)
522 # Additional helpers built in scripts/
523 # Carefully list dependencies so we do not try to build scripts twice
526 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
528 $(Q)$(MAKE) $(build)=$(@)
530 # Objects we will link into vmlinux / subdirs we need to visit
532 drivers-y := drivers/ sound/ firmware/
536 endif # KBUILD_EXTMOD
538 ifeq ($(dot-config),1)
540 -include include/config/auto.conf
542 ifeq ($(KBUILD_EXTMOD),)
543 # Read in dependencies to all Kconfig* files, make sure to run
544 # oldconfig if changes are detected.
545 -include include/config/auto.conf.cmd
547 # To avoid any implicit rule to kick in, define an empty command
548 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
550 # If .config is newer than include/config/auto.conf, someone tinkered
551 # with it and forgot to run make oldconfig.
552 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
553 # we execute the config step to be sure to catch updated Kconfig files
554 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
555 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
557 # external modules needs include/generated/autoconf.h and include/config/auto.conf
558 # but do not care if they are up-to-date. Use auto.conf to trigger the test
559 PHONY += include/config/auto.conf
561 include/config/auto.conf:
562 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
564 echo >&2 " ERROR: Kernel configuration is invalid."; \
565 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
566 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
570 endif # KBUILD_EXTMOD
573 # Dummy target needed, because used as prerequisite
574 include/config/auto.conf: ;
575 endif # $(dot-config)
577 # The all: target is the default when no target is given on the
579 # This allow a user to issue only 'make' to build a kernel including modules
580 # Defaults to vmlinux, but the arch makefile usually adds further targets
583 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
584 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
589 include $(srctree)/arch/$(SRCARCH)/Makefile
591 ifdef CONFIG_READABLE_ASM
592 # Disable optimizations that make assembler listings hard to read.
593 # reorder blocks reorders the control in the function
594 # ipa clone creates specialized cloned functions
595 # partial inlining inlines only parts of functions
596 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
597 $(call cc-option,-fno-ipa-cp-clone,) \
598 $(call cc-option,-fno-partial-inlining)
601 ifneq ($(CONFIG_FRAME_WARN),0)
602 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
605 # Handle stack protector mode.
606 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
607 stackp-flag := -fstack-protector
608 ifeq ($(call cc-option, $(stackp-flag)),)
609 $(warning Cannot use CONFIG_CC_STACKPROTECTOR: \
610 -fstack-protector not supported by compiler))
612 else ifdef CONFIG_CC_STACKPROTECTOR_STRONG
613 stackp-flag := -fstack-protector-strong
614 ifeq ($(call cc-option, $(stackp-flag)),)
615 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
616 -fstack-protector-strong not supported by compiler)
619 # Force off for distro compilers that enable stack protector by default.
620 stackp-flag := $(call cc-option, -fno-stack-protector)
622 KBUILD_CFLAGS += $(stackp-flag)
624 # This warning generated too much noise in a regular build.
625 # Use make W=1 to enable this warning (see scripts/Makefile.build)
626 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
628 ifdef CONFIG_FRAME_POINTER
629 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
631 # Some targets (ARM with Thumb2, for example), can't be built with frame
632 # pointers. For those, we don't have FUNCTION_TRACER automatically
633 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
634 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
635 # -fomit-frame-pointer with FUNCTION_TRACER.
636 ifndef CONFIG_FUNCTION_TRACER
637 KBUILD_CFLAGS += -fomit-frame-pointer
641 ifdef CONFIG_DEBUG_INFO
643 KBUILD_AFLAGS += -Wa,--gdwarf-2
646 ifdef CONFIG_DEBUG_INFO_REDUCED
647 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
648 $(call cc-option,-fno-var-tracking)
651 ifdef CONFIG_FUNCTION_TRACER
652 ifdef CONFIG_HAVE_FENTRY
653 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
655 KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
656 KBUILD_AFLAGS += $(CC_USING_FENTRY)
657 ifdef CONFIG_DYNAMIC_FTRACE
658 ifdef CONFIG_HAVE_C_RECORDMCOUNT
659 BUILD_C_RECORDMCOUNT := y
660 export BUILD_C_RECORDMCOUNT
665 # We trigger additional mismatches with less inlining
666 ifdef CONFIG_DEBUG_SECTION_MISMATCH
667 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
670 # arch Makefile may override CC so keep this after arch Makefile is included
671 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
672 CHECKFLAGS += $(NOSTDINC_FLAGS)
674 # warn about C99 declaration after statement
675 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
677 # disable pointer signed / unsigned warnings in gcc 4.0
678 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
680 # disable invalid "can't wrap" optimizations for signed / pointers
681 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
683 # conserve stack if available
684 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
686 # disallow errors like 'EXPORT_GPL(foo);' with missing header
687 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
689 # require functions to have arguments in prototypes, not empty 'int foo()'
690 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
692 # Prohibit date/time macros, which would make the build non-deterministic
693 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
695 # use the deterministic mode of AR if available
696 KBUILD_ARFLAGS := $(call ar-option,D)
698 # check for 'asm goto'
699 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
700 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
703 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
704 KBUILD_CPPFLAGS += $(KCPPFLAGS)
705 KBUILD_AFLAGS += $(KAFLAGS)
706 KBUILD_CFLAGS += $(KCFLAGS)
708 # Use --build-id when available.
709 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
710 $(call cc-ldoption, -Wl$(comma)--build-id,))
711 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
712 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
714 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
715 LDFLAGS_vmlinux += $(call ld-option, -X,)
718 # Default kernel image to build when no specific target is given.
719 # KBUILD_IMAGE may be overruled on the command line or
720 # set in the environment
721 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
723 export KBUILD_IMAGE ?= vmlinux
726 # INSTALL_PATH specifies where to place the updated kernel and system map
727 # images. Default is /boot, but you can set it to other values
728 export INSTALL_PATH ?= /boot
731 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
732 # relocations required by build roots. This is not defined in the
733 # makefile but the argument can be passed to make if needed.
736 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
740 # INSTALL_MOD_STRIP, if defined, will cause modules to be
741 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
742 # the default option --strip-debug will be used. Otherwise,
743 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
745 ifdef INSTALL_MOD_STRIP
746 ifeq ($(INSTALL_MOD_STRIP),1)
747 mod_strip_cmd = $(STRIP) --strip-debug
749 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
750 endif # INSTALL_MOD_STRIP=1
753 endif # INSTALL_MOD_STRIP
756 # Select initial ramdisk compression format, default is gzip(1).
757 # This shall be used by the dracut(8) tool while creating an initramfs image.
759 INITRD_COMPRESS-y := gzip
760 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
761 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
762 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
763 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
764 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
765 # do not export INITRD_COMPRESS, since we didn't actually
766 # choose a sane default compression above.
767 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
769 ifdef CONFIG_MODULE_SIG_ALL
770 MODSECKEY = ./signing_key.priv
771 MODPUBKEY = ./signing_key.x509
773 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
780 ifeq ($(KBUILD_EXTMOD),)
781 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
783 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
784 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
785 $(net-y) $(net-m) $(libs-y) $(libs-m)))
787 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
789 $(core-n) $(core-) $(drivers-n) $(drivers-) \
790 $(net-n) $(net-) $(libs-n) $(libs-))))
792 init-y := $(patsubst %/, %/built-in.o, $(init-y))
793 core-y := $(patsubst %/, %/built-in.o, $(core-y))
794 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
795 net-y := $(patsubst %/, %/built-in.o, $(net-y))
796 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
797 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
798 libs-y := $(libs-y1) $(libs-y2)
800 # Externally visible symbols (used by link-vmlinux.sh)
801 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
802 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
803 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
804 export LDFLAGS_vmlinux
805 # used by scripts/pacmage/Makefile
806 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
808 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
810 # Final link of vmlinux
811 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
812 quiet_cmd_link-vmlinux = LINK $@
814 # Include targets which we want to
815 # execute if the rest of the kernel build went well.
816 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
817 ifdef CONFIG_HEADERS_CHECK
818 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
821 $(Q)$(MAKE) $(build)=samples
823 ifdef CONFIG_BUILD_DOCSRC
824 $(Q)$(MAKE) $(build)=Documentation
826 +$(call if_changed,link-vmlinux)
828 # The actual objects are generated when descending,
829 # make sure no implicit rule kicks in
830 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
832 # Handle descending into subdirectories listed in $(vmlinux-dirs)
833 # Preset locale variables to speed up the build process. Limit locale
834 # tweaks to this spot to avoid wrong language settings when running
835 # make menuconfig etc.
836 # Error messages still appears in the original language
838 PHONY += $(vmlinux-dirs)
839 $(vmlinux-dirs): prepare scripts
840 $(Q)$(MAKE) $(build)=$@
842 define filechk_kernel.release
843 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
846 # Store (new) KERNELRELEASE string in include/config/kernel.release
847 include/config/kernel.release: include/config/auto.conf FORCE
848 $(call filechk,kernel.release)
851 # Things we need to do before we recursively start building the kernel
852 # or the modules are listed in "prepare".
853 # A multi level approach is used. prepareN is processed before prepareN-1.
854 # archprepare is used in arch Makefiles and when processed asm symlink,
855 # version.h and scripts_basic is processed / created.
857 # Listed in dependency order
858 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
860 # prepare3 is used to check if we are building in a separate output directory,
862 # 1) Check that make has not been executed in the kernel src $(srctree)
863 prepare3: include/config/kernel.release
864 ifneq ($(KBUILD_SRC),)
865 @$(kecho) ' Using $(srctree) as source for kernel'
866 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
867 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
868 echo >&2 " in the '$(srctree)' directory.";\
873 # prepare2 creates a makefile if using a separate output directory
874 prepare2: prepare3 outputmakefile asm-generic
876 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
877 include/config/auto.conf
880 archprepare: archheaders archscripts prepare1 scripts_basic
882 prepare0: archprepare FORCE
883 $(Q)$(MAKE) $(build)=.
885 # All the preparing..
888 # Generate some files
889 # ---------------------------------------------------------------------------
891 # KERNELRELEASE can change from a few different places, meaning version.h
892 # needs to be updated, so this check is forced on all builds
895 define filechk_utsrelease.h
896 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
897 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
900 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
903 define filechk_version.h
904 (echo \#define LINUX_VERSION_CODE $(shell \
905 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
906 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
909 $(version_h): $(srctree)/Makefile FORCE
910 $(call filechk,version.h)
912 include/generated/utsrelease.h: include/config/kernel.release FORCE
913 $(call filechk,utsrelease.h)
917 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
918 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
920 # ---------------------------------------------------------------------------
924 @echo '*** Warning: make $@ is unnecessary now.'
926 # ---------------------------------------------------------------------------
928 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
929 export INSTALL_FW_PATH
931 PHONY += firmware_install
932 firmware_install: FORCE
933 @mkdir -p $(objtree)/firmware
934 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
936 # ---------------------------------------------------------------------------
939 #Default location for installed headers
940 export INSTALL_HDR_PATH = $(objtree)/usr
942 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
944 # If we do an all arch process set dst to asm-$(hdr-arch)
945 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
954 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
955 $(Q)$(MAKE) $(build)=scripts build_unifdef
957 PHONY += headers_install_all
959 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
961 PHONY += headers_install
962 headers_install: __headers
963 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
964 $(error Headers not exportable for the $(SRCARCH) architecture))
965 $(Q)$(MAKE) $(hdr-inst)=include/uapi
966 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
968 PHONY += headers_check_all
969 headers_check_all: headers_install_all
970 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
972 PHONY += headers_check
973 headers_check: headers_install
974 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
975 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
977 # ---------------------------------------------------------------------------
982 # By default, build modules as well
988 # A module can be listed more than once in obj-m resulting in
989 # duplicate lines in modules.order files. Those are removed
990 # using awk while concatenating to the final file.
993 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
994 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
995 @$(kecho) ' Building modules, stage 2.';
996 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
997 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
999 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1000 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1002 %/modules.builtin: include/config/auto.conf
1003 $(Q)$(MAKE) $(modbuiltin)=$*
1006 # Target to prepare building external modules
1007 PHONY += modules_prepare
1008 modules_prepare: prepare scripts
1010 # Target to install modules
1011 PHONY += modules_install
1012 modules_install: _modinst_ _modinst_post
1016 @rm -rf $(MODLIB)/kernel
1017 @rm -f $(MODLIB)/source
1018 @mkdir -p $(MODLIB)/kernel
1019 @ln -s $(srctree) $(MODLIB)/source
1020 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1021 rm -f $(MODLIB)/build ; \
1022 ln -s $(objtree) $(MODLIB)/build ; \
1024 @cp -f $(objtree)/modules.order $(MODLIB)/
1025 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1026 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1028 # This depmod is only for convenience to give the initial
1029 # boot a modules.dep even before / is mounted read-write. However the
1030 # boot script depmod is the master version.
1031 PHONY += _modinst_post
1032 _modinst_post: _modinst_
1033 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1036 ifeq ($(CONFIG_MODULE_SIG), y)
1037 PHONY += modules_sign
1039 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1042 else # CONFIG_MODULES
1044 # Modules not configured
1045 # ---------------------------------------------------------------------------
1047 modules modules_install: FORCE
1049 @echo >&2 "The present kernel configuration has modules disabled."
1050 @echo >&2 "Type 'make config' and enable loadable module support."
1051 @echo >&2 "Then build a kernel with module support enabled."
1055 endif # CONFIG_MODULES
1058 # Cleaning is done on three levels.
1059 # make clean Delete most generated files
1060 # Leave enough to build external modules
1061 # make mrproper Delete the current configuration, and all generated files
1062 # make distclean Remove editor backup files, patch leftover files and the like
1064 # Directories & files removed with 'make clean'
1065 CLEAN_DIRS += $(MODVERDIR)
1067 # Directories & files removed with 'make mrproper'
1068 MRPROPER_DIRS += include/config usr/include include/generated \
1069 arch/*/include/generated
1070 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1071 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1072 signing_key.priv signing_key.x509 x509.genkey \
1073 extra_certificates signing_key.x509.keyid \
1074 signing_key.x509.signer include/linux/version.h
1076 # clean - Delete most, but leave enough to build external modules
1078 clean: rm-dirs := $(CLEAN_DIRS)
1079 clean: rm-files := $(CLEAN_FILES)
1080 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1082 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1084 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1087 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1089 clean: archclean vmlinuxclean
1091 # mrproper - Delete all generated files, including .config
1093 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1094 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1095 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1097 PHONY += $(mrproper-dirs) mrproper archmrproper
1099 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1101 mrproper: clean archmrproper $(mrproper-dirs)
1110 @find $(srctree) $(RCS_FIND_IGNORE) \
1111 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1112 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1113 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1114 -type f -print | xargs rm -f
1117 # Packaging of the kernel to various formats
1118 # ---------------------------------------------------------------------------
1119 # rpm target kept for backward compatibility
1120 package-dir := $(srctree)/scripts/package
1123 $(Q)$(MAKE) $(build)=$(package-dir) $@
1124 %pkg: include/config/kernel.release FORCE
1125 $(Q)$(MAKE) $(build)=$(package-dir) $@
1126 rpm: include/config/kernel.release FORCE
1127 $(Q)$(MAKE) $(build)=$(package-dir) $@
1130 # Brief documentation of the typical targets used
1131 # ---------------------------------------------------------------------------
1133 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1134 boards := $(notdir $(boards))
1135 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1136 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1139 @echo 'Cleaning targets:'
1140 @echo ' clean - Remove most generated files but keep the config and'
1141 @echo ' enough build support to build external modules'
1142 @echo ' mrproper - Remove all generated files + config + various backup files'
1143 @echo ' distclean - mrproper + remove editor backup and patch files'
1145 @echo 'Configuration targets:'
1146 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1148 @echo 'Other generic targets:'
1149 @echo ' all - Build all targets marked with [*]'
1150 @echo '* vmlinux - Build the bare kernel'
1151 @echo '* modules - Build all modules'
1152 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1153 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1154 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1155 @echo ' dir/ - Build all files in dir and below'
1156 @echo ' dir/file.[oisS] - Build specified target only'
1157 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1158 @echo ' (requires a recent binutils and recent build (System.map))'
1159 @echo ' dir/file.ko - Build module including final link'
1160 @echo ' modules_prepare - Set up for building external modules'
1161 @echo ' tags/TAGS - Generate tags file for editors'
1162 @echo ' cscope - Generate cscope index'
1163 @echo ' gtags - Generate GNU GLOBAL index'
1164 @echo ' kernelrelease - Output the release version string'
1165 @echo ' kernelversion - Output the version stored in Makefile'
1166 @echo ' image_name - Output the image name'
1167 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1168 echo ' (default: $(INSTALL_HDR_PATH))'; \
1170 @echo 'Static analysers'
1171 @echo ' checkstack - Generate a list of stack hogs'
1172 @echo ' namespacecheck - Name space analysis on compiled kernel'
1173 @echo ' versioncheck - Sanity check on version.h usage'
1174 @echo ' includecheck - Check for duplicate included header files'
1175 @echo ' export_report - List the usages of all exported symbols'
1176 @echo ' headers_check - Sanity check on exported headers'
1177 @echo ' headerdep - Detect inclusion cycles in headers'
1178 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1180 @echo 'Kernel packaging:'
1181 @$(MAKE) $(build)=$(package-dir) help
1183 @echo 'Documentation targets:'
1184 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1186 @echo 'Architecture specific targets ($(SRCARCH)):'
1187 @$(if $(archhelp),$(archhelp),\
1188 echo ' No architecture specific help defined for $(SRCARCH)')
1191 $(foreach b, $(boards), \
1192 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1194 @$(if $(board-dirs), \
1195 $(foreach b, $(board-dirs), \
1196 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1197 printf " %-16s - Show all of the above\\n" help-boards; \
1200 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1201 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1202 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1203 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1204 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1205 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1206 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1207 @echo ' 1: warnings which may be relevant and do not occur too often'
1208 @echo ' 2: warnings which occur quite often but may still be relevant'
1209 @echo ' 3: more obscure warnings, can most likely be ignored'
1210 @echo ' Multiple levels can be combined with W=12 or W=123'
1212 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1213 @echo 'For further info see the ./README file'
1216 help-board-dirs := $(addprefix help-,$(board-dirs))
1218 help-boards: $(help-board-dirs)
1220 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1222 $(help-board-dirs): help-%:
1223 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1224 @$(if $(boards-per-dir), \
1225 $(foreach b, $(boards-per-dir), \
1226 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1230 # Documentation targets
1231 # ---------------------------------------------------------------------------
1232 %docs: scripts_basic FORCE
1233 $(Q)$(MAKE) $(build)=scripts build_docproc
1234 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1236 else # KBUILD_EXTMOD
1239 # External module support.
1240 # When building external modules the kernel used as basis is considered
1241 # read-only, and no consistency checks are made and the make
1242 # system is not used on the basis kernel. If updates are required
1243 # in the basis kernel ordinary make commands (without M=...) must
1246 # The following are the only valid targets when building external
1248 # make M=dir clean Delete all automatically generated files
1249 # make M=dir modules Make all modules in specified dir
1250 # make M=dir Same as 'make M=dir modules'
1251 # make M=dir modules_install
1252 # Install the modules built in the module directory
1253 # Assumes install directory is already created
1255 # We are always building modules
1257 PHONY += crmodverdir
1261 PHONY += $(objtree)/Module.symvers
1262 $(objtree)/Module.symvers:
1263 @test -e $(objtree)/Module.symvers || ( \
1265 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1266 echo " is missing; modules will have no dependencies and modversions."; \
1269 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1270 PHONY += $(module-dirs) modules
1271 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1272 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1274 modules: $(module-dirs)
1275 @$(kecho) ' Building modules, stage 2.';
1276 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1278 PHONY += modules_install
1279 modules_install: _emodinst_ _emodinst_post
1281 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1284 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1285 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1287 PHONY += _emodinst_post
1288 _emodinst_post: _emodinst_
1291 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1293 PHONY += $(clean-dirs) clean
1295 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1297 clean: rm-dirs := $(MODVERDIR)
1298 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1301 @echo ' Building external modules.'
1302 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1304 @echo ' modules - default target, build the module(s)'
1305 @echo ' modules_install - install the module'
1306 @echo ' clean - remove generated files in module directory only'
1310 PHONY += prepare scripts
1313 endif # KBUILD_EXTMOD
1315 clean: $(clean-dirs)
1318 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1319 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1321 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1322 -o -name '*.symtypes' -o -name 'modules.order' \
1323 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1324 -o -name '*.gcno' \) -type f -print | xargs rm -f
1326 # Generate tags for editors
1327 # ---------------------------------------------------------------------------
1328 quiet_cmd_tags = GEN $@
1329 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1331 tags TAGS cscope gtags: FORCE
1334 # Scripts to check various things for consistency
1335 # ---------------------------------------------------------------------------
1337 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1340 find $(srctree)/* $(RCS_FIND_IGNORE) \
1341 -name '*.[hcS]' -type f -print | sort \
1342 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1345 find $(srctree)/* $(RCS_FIND_IGNORE) \
1346 -name '*.[hcS]' -type f -print | sort \
1347 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1350 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1353 $(PERL) $(srctree)/scripts/namespace.pl
1356 $(PERL) $(srctree)/scripts/export_report.pl
1358 endif #ifeq ($(config-targets),1)
1359 endif #ifeq ($(mixed-targets),1)
1361 PHONY += checkstack kernelrelease kernelversion image_name
1363 # UML needs a little special treatment here. It wants to use the host
1364 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1365 # else wants $(ARCH), including people doing cross-builds, which means
1366 # that $(SUBARCH) doesn't work here.
1368 CHECKSTACK_ARCH := $(SUBARCH)
1370 CHECKSTACK_ARCH := $(ARCH)
1373 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1374 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1377 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1380 @echo $(KERNELVERSION)
1383 @echo $(KBUILD_IMAGE)
1385 # Clear a bunch of variables before executing the submake
1387 $(Q)mkdir -p $(objtree)/tools
1388 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1391 $(Q)mkdir -p $(objtree)/tools
1392 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1395 # ---------------------------------------------------------------------------
1396 # Single targets are compatible with:
1397 # - build with mixed source and output
1398 # - build with separate output dir 'make O=...'
1399 # - external modules
1401 # target-dir => where to store outputfile
1402 # build-dir => directory in kernel source tree to use
1404 ifeq ($(KBUILD_EXTMOD),)
1405 build-dir = $(patsubst %/,%,$(dir $@))
1406 target-dir = $(dir $@)
1408 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1409 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1410 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1413 %.s: %.c prepare scripts FORCE
1414 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1415 %.i: %.c prepare scripts FORCE
1416 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1417 %.o: %.c prepare scripts FORCE
1418 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1419 %.lst: %.c prepare scripts FORCE
1420 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1421 %.s: %.S prepare scripts FORCE
1422 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1423 %.o: %.S prepare scripts FORCE
1424 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1425 %.symtypes: %.c prepare scripts FORCE
1426 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1429 /: prepare scripts FORCE
1431 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1432 $(build)=$(build-dir)
1433 %/: prepare scripts FORCE
1435 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1436 $(build)=$(build-dir)
1437 %.ko: prepare scripts FORCE
1439 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1440 $(build)=$(build-dir) $(@:.ko=.o)
1441 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1443 # FIXME Should go into a make.lib or something
1444 # ===========================================================================
1446 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1447 cmd_rmdirs = rm -rf $(rm-dirs)
1449 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1450 cmd_rmfiles = rm -f $(rm-files)
1452 # Run depmod only if we have System.map and depmod is executable
1453 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1454 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1455 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1457 # Create temporary dir for module support files
1458 # clean it up only when building all modules
1459 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1460 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1462 # read all saved command lines
1464 targets := $(wildcard $(sort $(targets)))
1465 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1467 ifneq ($(cmd_files),)
1468 $(cmd_files): ; # Do not try to update included dependency files
1469 include $(cmd_files)
1472 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1474 # $(Q)$(MAKE) $(clean)=dir
1475 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1477 endif # skip-makefile
1482 # Declare the contents of the .PHONY variable as phony. We keep that
1483 # information in a variable so we can use it in if_changed and friends.