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 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 ($(filter 4.%,$(MAKE_VERSION)),) # make-4
315 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
319 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
324 export quiet Q KBUILD_VERBOSE
327 # Look for make include files relative to root of kernel src
328 MAKEFLAGS += --include-dir=$(srctree)
330 # We need some generic definitions (do not try to remake the file).
331 $(srctree)/scripts/Kbuild.include: ;
332 include $(srctree)/scripts/Kbuild.include
334 # Make variables (CC, etc...)
336 AS = $(CROSS_COMPILE)as
337 LD = $(CROSS_COMPILE)ld
338 CC = $(CROSS_COMPILE)gcc
340 AR = $(CROSS_COMPILE)ar
341 NM = $(CROSS_COMPILE)nm
342 STRIP = $(CROSS_COMPILE)strip
343 OBJCOPY = $(CROSS_COMPILE)objcopy
344 OBJDUMP = $(CROSS_COMPILE)objdump
346 GENKSYMS = scripts/genksyms/genksyms
347 INSTALLKERNEL := installkernel
348 DEPMOD = /sbin/depmod
352 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
353 -Wbitwise -Wno-return-void $(CF)
359 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
362 # Use USERINCLUDE when you must reference the UAPI directories only.
364 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
365 -Iarch/$(hdr-arch)/include/generated/uapi \
366 -I$(srctree)/include/uapi \
367 -Iinclude/generated/uapi \
368 -include $(srctree)/include/linux/kconfig.h
370 # Use LINUXINCLUDE when you must reference the include/ directory.
371 # Needed to be compatible with the O= option
373 -I$(srctree)/arch/$(hdr-arch)/include \
374 -Iarch/$(hdr-arch)/include/generated \
375 $(if $(KBUILD_SRC), -I$(srctree)/include) \
379 KBUILD_CPPFLAGS := -D__KERNEL__
381 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
382 -fno-strict-aliasing -fno-common \
383 -Werror-implicit-function-declaration \
384 -Wno-format-security \
385 -fno-delete-null-pointer-checks
386 KBUILD_AFLAGS_KERNEL :=
387 KBUILD_CFLAGS_KERNEL :=
388 KBUILD_AFLAGS := -D__ASSEMBLY__
389 KBUILD_AFLAGS_MODULE := -DMODULE
390 KBUILD_CFLAGS_MODULE := -DMODULE
391 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
393 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
394 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
395 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
397 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
398 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
399 export CPP AR NM STRIP OBJCOPY OBJDUMP
400 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
401 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
403 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
404 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
405 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
406 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
407 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
408 export KBUILD_ARFLAGS
410 # When compiling out-of-tree modules, put MODVERDIR in the module
411 # tree rather than in the kernel tree. The kernel tree might
413 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
415 # Files to ignore in find ... statements
417 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
418 -o -name .pc -o -name .hg -o -name .git \) -prune -o
419 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
420 --exclude CVS --exclude .pc --exclude .hg --exclude .git
422 # ===========================================================================
423 # Rules shared between *config targets and build targets
425 # Basic helpers built in scripts/
426 PHONY += scripts_basic
428 $(Q)$(MAKE) $(build)=scripts/basic
429 $(Q)rm -f .tmp_quiet_recordmcount
431 # To avoid any implicit rule to kick in, define an empty command.
432 scripts/basic/%: scripts_basic ;
434 PHONY += outputmakefile
435 # outputmakefile generates a Makefile in the output directory, if using a
436 # separate output directory. This allows convenient use of make in the
439 ifneq ($(KBUILD_SRC),)
440 $(Q)ln -fsn $(srctree) source
441 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
442 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
445 # Support for using generic headers in asm-generic
448 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
449 src=asm obj=arch/$(SRCARCH)/include/generated/asm
450 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
451 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
453 # To make sure we do not include .config for any of the *config targets
454 # catch them early, and hand them over to scripts/kconfig/Makefile
455 # It is allowed to specify more targets when calling make, including
456 # mixing *config targets and build targets.
457 # For example 'make oldconfig all'.
458 # Detect when mixed targets is specified, and make a second invocation
459 # of make so .config is not included in this case either (for *config).
461 version_h := include/generated/uapi/linux/version.h
463 no-dot-config-targets := clean mrproper distclean \
464 cscope gtags TAGS tags help %docs check% coccicheck \
465 $(version_h) headers_% archheaders archscripts \
466 kernelversion %src-pkg
472 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
473 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
478 ifeq ($(KBUILD_EXTMOD),)
479 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
481 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
487 ifeq ($(mixed-targets),1)
488 # ===========================================================================
489 # We're called with mixed targets (*config and build targets).
490 # Handle them one by one.
493 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
496 ifeq ($(config-targets),1)
497 # ===========================================================================
498 # *config targets only - make sure prerequisites are updated, and descend
499 # in scripts/kconfig to make the *config target
501 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
502 # KBUILD_DEFCONFIG may point out an alternative default configuration
503 # used for 'make defconfig'
504 include $(srctree)/arch/$(SRCARCH)/Makefile
505 export KBUILD_DEFCONFIG KBUILD_KCONFIG
507 config: scripts_basic outputmakefile FORCE
508 $(Q)mkdir -p include/linux include/config
509 $(Q)$(MAKE) $(build)=scripts/kconfig $@
511 %config: scripts_basic outputmakefile FORCE
512 $(Q)mkdir -p include/linux include/config
513 $(Q)$(MAKE) $(build)=scripts/kconfig $@
516 # ===========================================================================
517 # Build targets only - this includes vmlinux, arch specific targets, clean
518 # targets and others. In general all targets except *config targets.
520 ifeq ($(KBUILD_EXTMOD),)
521 # Additional helpers built in scripts/
522 # Carefully list dependencies so we do not try to build scripts twice
525 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
527 $(Q)$(MAKE) $(build)=$(@)
529 # Objects we will link into vmlinux / subdirs we need to visit
531 drivers-y := drivers/ sound/ firmware/
535 endif # KBUILD_EXTMOD
537 ifeq ($(dot-config),1)
539 -include include/config/auto.conf
541 ifeq ($(KBUILD_EXTMOD),)
542 # Read in dependencies to all Kconfig* files, make sure to run
543 # oldconfig if changes are detected.
544 -include include/config/auto.conf.cmd
546 # To avoid any implicit rule to kick in, define an empty command
547 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
549 # If .config is newer than include/config/auto.conf, someone tinkered
550 # with it and forgot to run make oldconfig.
551 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
552 # we execute the config step to be sure to catch updated Kconfig files
553 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
554 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
556 # external modules needs include/generated/autoconf.h and include/config/auto.conf
557 # but do not care if they are up-to-date. Use auto.conf to trigger the test
558 PHONY += include/config/auto.conf
560 include/config/auto.conf:
561 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
563 echo >&2 " ERROR: Kernel configuration is invalid."; \
564 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
565 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
569 endif # KBUILD_EXTMOD
572 # Dummy target needed, because used as prerequisite
573 include/config/auto.conf: ;
574 endif # $(dot-config)
576 # The all: target is the default when no target is given on the
578 # This allow a user to issue only 'make' to build a kernel including modules
579 # Defaults to vmlinux, but the arch makefile usually adds further targets
582 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
583 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
588 include $(srctree)/arch/$(SRCARCH)/Makefile
590 ifdef CONFIG_READABLE_ASM
591 # Disable optimizations that make assembler listings hard to read.
592 # reorder blocks reorders the control in the function
593 # ipa clone creates specialized cloned functions
594 # partial inlining inlines only parts of functions
595 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
596 $(call cc-option,-fno-ipa-cp-clone,) \
597 $(call cc-option,-fno-partial-inlining)
600 ifneq ($(CONFIG_FRAME_WARN),0)
601 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
604 # Handle stack protector mode.
605 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
606 stackp-flag := -fstack-protector
607 ifeq ($(call cc-option, $(stackp-flag)),)
608 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
609 -fstack-protector not supported by compiler)
612 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
613 stackp-flag := -fstack-protector-strong
614 ifeq ($(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)
623 KBUILD_CFLAGS += $(stackp-flag)
625 # This warning generated too much noise in a regular build.
626 # Use make W=1 to enable this warning (see scripts/Makefile.build)
627 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
629 ifdef CONFIG_FRAME_POINTER
630 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
632 # Some targets (ARM with Thumb2, for example), can't be built with frame
633 # pointers. For those, we don't have FUNCTION_TRACER automatically
634 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
635 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
636 # -fomit-frame-pointer with FUNCTION_TRACER.
637 ifndef CONFIG_FUNCTION_TRACER
638 KBUILD_CFLAGS += -fomit-frame-pointer
642 ifdef CONFIG_DEBUG_INFO
644 KBUILD_AFLAGS += -Wa,--gdwarf-2
647 ifdef CONFIG_DEBUG_INFO_REDUCED
648 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
649 $(call cc-option,-fno-var-tracking)
652 ifdef CONFIG_FUNCTION_TRACER
653 ifdef CONFIG_HAVE_FENTRY
654 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
656 KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
657 KBUILD_AFLAGS += $(CC_USING_FENTRY)
658 ifdef CONFIG_DYNAMIC_FTRACE
659 ifdef CONFIG_HAVE_C_RECORDMCOUNT
660 BUILD_C_RECORDMCOUNT := y
661 export BUILD_C_RECORDMCOUNT
666 # We trigger additional mismatches with less inlining
667 ifdef CONFIG_DEBUG_SECTION_MISMATCH
668 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
671 # arch Makefile may override CC so keep this after arch Makefile is included
672 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
673 CHECKFLAGS += $(NOSTDINC_FLAGS)
675 # warn about C99 declaration after statement
676 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
678 # disable pointer signed / unsigned warnings in gcc 4.0
679 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
681 # disable invalid "can't wrap" optimizations for signed / pointers
682 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
684 # conserve stack if available
685 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
687 # disallow errors like 'EXPORT_GPL(foo);' with missing header
688 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
690 # require functions to have arguments in prototypes, not empty 'int foo()'
691 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
693 # Prohibit date/time macros, which would make the build non-deterministic
694 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
696 # use the deterministic mode of AR if available
697 KBUILD_ARFLAGS := $(call ar-option,D)
699 # check for 'asm goto'
700 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
701 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
704 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
705 KBUILD_CPPFLAGS += $(KCPPFLAGS)
706 KBUILD_AFLAGS += $(KAFLAGS)
707 KBUILD_CFLAGS += $(KCFLAGS)
709 # Use --build-id when available.
710 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
711 $(call cc-ldoption, -Wl$(comma)--build-id,))
712 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
713 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
715 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
716 LDFLAGS_vmlinux += $(call ld-option, -X,)
719 # Default kernel image to build when no specific target is given.
720 # KBUILD_IMAGE may be overruled on the command line or
721 # set in the environment
722 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
724 export KBUILD_IMAGE ?= vmlinux
727 # INSTALL_PATH specifies where to place the updated kernel and system map
728 # images. Default is /boot, but you can set it to other values
729 export INSTALL_PATH ?= /boot
732 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
733 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
734 # an argument if needed. Otherwise it defaults to the kernel install path
736 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
739 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
740 # relocations required by build roots. This is not defined in the
741 # makefile but the argument can be passed to make if needed.
744 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
748 # INSTALL_MOD_STRIP, if defined, will cause modules to be
749 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
750 # the default option --strip-debug will be used. Otherwise,
751 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
753 ifdef INSTALL_MOD_STRIP
754 ifeq ($(INSTALL_MOD_STRIP),1)
755 mod_strip_cmd = $(STRIP) --strip-debug
757 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
758 endif # INSTALL_MOD_STRIP=1
761 endif # INSTALL_MOD_STRIP
764 # Select initial ramdisk compression format, default is gzip(1).
765 # This shall be used by the dracut(8) tool while creating an initramfs image.
767 INITRD_COMPRESS-y := gzip
768 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
769 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
770 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
771 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
772 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
773 # do not export INITRD_COMPRESS, since we didn't actually
774 # choose a sane default compression above.
775 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
777 ifdef CONFIG_MODULE_SIG_ALL
778 MODSECKEY = ./signing_key.priv
779 MODPUBKEY = ./signing_key.x509
781 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
788 ifeq ($(KBUILD_EXTMOD),)
789 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
791 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
792 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
793 $(net-y) $(net-m) $(libs-y) $(libs-m)))
795 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
797 $(core-n) $(core-) $(drivers-n) $(drivers-) \
798 $(net-n) $(net-) $(libs-n) $(libs-))))
800 init-y := $(patsubst %/, %/built-in.o, $(init-y))
801 core-y := $(patsubst %/, %/built-in.o, $(core-y))
802 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
803 net-y := $(patsubst %/, %/built-in.o, $(net-y))
804 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
805 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
806 libs-y := $(libs-y1) $(libs-y2)
808 # Externally visible symbols (used by link-vmlinux.sh)
809 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
810 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
811 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
812 export LDFLAGS_vmlinux
813 # used by scripts/pacmage/Makefile
814 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
816 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
818 # Final link of vmlinux
819 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
820 quiet_cmd_link-vmlinux = LINK $@
822 # Include targets which we want to
823 # execute if the rest of the kernel build went well.
824 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
825 ifdef CONFIG_HEADERS_CHECK
826 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
829 $(Q)$(MAKE) $(build)=samples
831 ifdef CONFIG_BUILD_DOCSRC
832 $(Q)$(MAKE) $(build)=Documentation
834 +$(call if_changed,link-vmlinux)
836 # The actual objects are generated when descending,
837 # make sure no implicit rule kicks in
838 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
840 # Handle descending into subdirectories listed in $(vmlinux-dirs)
841 # Preset locale variables to speed up the build process. Limit locale
842 # tweaks to this spot to avoid wrong language settings when running
843 # make menuconfig etc.
844 # Error messages still appears in the original language
846 PHONY += $(vmlinux-dirs)
847 $(vmlinux-dirs): prepare scripts
848 $(Q)$(MAKE) $(build)=$@
850 define filechk_kernel.release
851 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
854 # Store (new) KERNELRELEASE string in include/config/kernel.release
855 include/config/kernel.release: include/config/auto.conf FORCE
856 $(call filechk,kernel.release)
859 # Things we need to do before we recursively start building the kernel
860 # or the modules are listed in "prepare".
861 # A multi level approach is used. prepareN is processed before prepareN-1.
862 # archprepare is used in arch Makefiles and when processed asm symlink,
863 # version.h and scripts_basic is processed / created.
865 # Listed in dependency order
866 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
868 # prepare3 is used to check if we are building in a separate output directory,
870 # 1) Check that make has not been executed in the kernel src $(srctree)
871 prepare3: include/config/kernel.release
872 ifneq ($(KBUILD_SRC),)
873 @$(kecho) ' Using $(srctree) as source for kernel'
874 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
875 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
876 echo >&2 " in the '$(srctree)' directory.";\
881 # prepare2 creates a makefile if using a separate output directory
882 prepare2: prepare3 outputmakefile asm-generic
884 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
885 include/config/auto.conf
888 archprepare: archheaders archscripts prepare1 scripts_basic
890 prepare0: archprepare FORCE
891 $(Q)$(MAKE) $(build)=.
893 # All the preparing..
896 # Generate some files
897 # ---------------------------------------------------------------------------
899 # KERNELRELEASE can change from a few different places, meaning version.h
900 # needs to be updated, so this check is forced on all builds
903 define filechk_utsrelease.h
904 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
905 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
908 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
911 define filechk_version.h
912 (echo \#define LINUX_VERSION_CODE $(shell \
913 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
914 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
917 $(version_h): $(srctree)/Makefile FORCE
918 $(call filechk,version.h)
920 include/generated/utsrelease.h: include/config/kernel.release FORCE
921 $(call filechk,utsrelease.h)
925 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
926 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
928 # ---------------------------------------------------------------------------
932 @echo '*** Warning: make $@ is unnecessary now.'
934 # ---------------------------------------------------------------------------
936 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
937 export INSTALL_FW_PATH
939 PHONY += firmware_install
940 firmware_install: FORCE
941 @mkdir -p $(objtree)/firmware
942 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
944 # ---------------------------------------------------------------------------
947 #Default location for installed headers
948 export INSTALL_HDR_PATH = $(objtree)/usr
950 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
952 # If we do an all arch process set dst to asm-$(hdr-arch)
953 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
962 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
963 $(Q)$(MAKE) $(build)=scripts build_unifdef
965 PHONY += headers_install_all
967 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
969 PHONY += headers_install
970 headers_install: __headers
971 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
972 $(error Headers not exportable for the $(SRCARCH) architecture))
973 $(Q)$(MAKE) $(hdr-inst)=include/uapi
974 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
976 PHONY += headers_check_all
977 headers_check_all: headers_install_all
978 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
980 PHONY += headers_check
981 headers_check: headers_install
982 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
983 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
985 # ---------------------------------------------------------------------------
990 # By default, build modules as well
996 # A module can be listed more than once in obj-m resulting in
997 # duplicate lines in modules.order files. Those are removed
998 # using awk while concatenating to the final file.
1001 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1002 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1003 @$(kecho) ' Building modules, stage 2.';
1004 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1005 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1007 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1008 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1010 %/modules.builtin: include/config/auto.conf
1011 $(Q)$(MAKE) $(modbuiltin)=$*
1014 # Target to prepare building external modules
1015 PHONY += modules_prepare
1016 modules_prepare: prepare scripts
1018 # Target to install modules
1019 PHONY += modules_install
1020 modules_install: _modinst_ _modinst_post
1024 @rm -rf $(MODLIB)/kernel
1025 @rm -f $(MODLIB)/source
1026 @mkdir -p $(MODLIB)/kernel
1027 @ln -s $(srctree) $(MODLIB)/source
1028 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1029 rm -f $(MODLIB)/build ; \
1030 ln -s $(objtree) $(MODLIB)/build ; \
1032 @cp -f $(objtree)/modules.order $(MODLIB)/
1033 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1034 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1036 # This depmod is only for convenience to give the initial
1037 # boot a modules.dep even before / is mounted read-write. However the
1038 # boot script depmod is the master version.
1039 PHONY += _modinst_post
1040 _modinst_post: _modinst_
1041 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1044 ifeq ($(CONFIG_MODULE_SIG), y)
1045 PHONY += modules_sign
1047 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1050 else # CONFIG_MODULES
1052 # Modules not configured
1053 # ---------------------------------------------------------------------------
1055 modules modules_install: FORCE
1057 @echo >&2 "The present kernel configuration has modules disabled."
1058 @echo >&2 "Type 'make config' and enable loadable module support."
1059 @echo >&2 "Then build a kernel with module support enabled."
1063 endif # CONFIG_MODULES
1066 # Cleaning is done on three levels.
1067 # make clean Delete most generated files
1068 # Leave enough to build external modules
1069 # make mrproper Delete the current configuration, and all generated files
1070 # make distclean Remove editor backup files, patch leftover files and the like
1072 # Directories & files removed with 'make clean'
1073 CLEAN_DIRS += $(MODVERDIR)
1075 # Directories & files removed with 'make mrproper'
1076 MRPROPER_DIRS += include/config usr/include include/generated \
1077 arch/*/include/generated
1078 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1079 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1080 signing_key.priv signing_key.x509 x509.genkey \
1081 extra_certificates signing_key.x509.keyid \
1082 signing_key.x509.signer
1084 # clean - Delete most, but leave enough to build external modules
1086 clean: rm-dirs := $(CLEAN_DIRS)
1087 clean: rm-files := $(CLEAN_FILES)
1088 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1090 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1092 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1095 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1097 clean: archclean vmlinuxclean
1099 # mrproper - Delete all generated files, including .config
1101 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1102 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1103 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1105 PHONY += $(mrproper-dirs) mrproper archmrproper
1107 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1109 mrproper: clean archmrproper $(mrproper-dirs)
1118 @find $(srctree) $(RCS_FIND_IGNORE) \
1119 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1120 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1122 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1123 -type f -print | xargs rm -f
1126 # Packaging of the kernel to various formats
1127 # ---------------------------------------------------------------------------
1128 # rpm target kept for backward compatibility
1129 package-dir := $(srctree)/scripts/package
1132 $(Q)$(MAKE) $(build)=$(package-dir) $@
1133 %pkg: include/config/kernel.release FORCE
1134 $(Q)$(MAKE) $(build)=$(package-dir) $@
1135 rpm: include/config/kernel.release FORCE
1136 $(Q)$(MAKE) $(build)=$(package-dir) $@
1139 # Brief documentation of the typical targets used
1140 # ---------------------------------------------------------------------------
1142 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1143 boards := $(notdir $(boards))
1144 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1145 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1148 @echo 'Cleaning targets:'
1149 @echo ' clean - Remove most generated files but keep the config and'
1150 @echo ' enough build support to build external modules'
1151 @echo ' mrproper - Remove all generated files + config + various backup files'
1152 @echo ' distclean - mrproper + remove editor backup and patch files'
1154 @echo 'Configuration targets:'
1155 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1157 @echo 'Other generic targets:'
1158 @echo ' all - Build all targets marked with [*]'
1159 @echo '* vmlinux - Build the bare kernel'
1160 @echo '* modules - Build all modules'
1161 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1162 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1163 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1164 @echo ' dir/ - Build all files in dir and below'
1165 @echo ' dir/file.[oisS] - Build specified target only'
1166 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1167 @echo ' (requires a recent binutils and recent build (System.map))'
1168 @echo ' dir/file.ko - Build module including final link'
1169 @echo ' modules_prepare - Set up for building external modules'
1170 @echo ' tags/TAGS - Generate tags file for editors'
1171 @echo ' cscope - Generate cscope index'
1172 @echo ' gtags - Generate GNU GLOBAL index'
1173 @echo ' kernelrelease - Output the release version string'
1174 @echo ' kernelversion - Output the version stored in Makefile'
1175 @echo ' image_name - Output the image name'
1176 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1177 echo ' (default: $(INSTALL_HDR_PATH))'; \
1179 @echo 'Static analysers'
1180 @echo ' checkstack - Generate a list of stack hogs'
1181 @echo ' namespacecheck - Name space analysis on compiled kernel'
1182 @echo ' versioncheck - Sanity check on version.h usage'
1183 @echo ' includecheck - Check for duplicate included header files'
1184 @echo ' export_report - List the usages of all exported symbols'
1185 @echo ' headers_check - Sanity check on exported headers'
1186 @echo ' headerdep - Detect inclusion cycles in headers'
1187 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1189 @echo 'Kernel packaging:'
1190 @$(MAKE) $(build)=$(package-dir) help
1192 @echo 'Documentation targets:'
1193 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1195 @echo 'Architecture specific targets ($(SRCARCH)):'
1196 @$(if $(archhelp),$(archhelp),\
1197 echo ' No architecture specific help defined for $(SRCARCH)')
1200 $(foreach b, $(boards), \
1201 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1203 @$(if $(board-dirs), \
1204 $(foreach b, $(board-dirs), \
1205 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1206 printf " %-16s - Show all of the above\\n" help-boards; \
1209 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1210 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1211 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1212 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1213 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1214 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1215 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1216 @echo ' 1: warnings which may be relevant and do not occur too often'
1217 @echo ' 2: warnings which occur quite often but may still be relevant'
1218 @echo ' 3: more obscure warnings, can most likely be ignored'
1219 @echo ' Multiple levels can be combined with W=12 or W=123'
1221 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1222 @echo 'For further info see the ./README file'
1225 help-board-dirs := $(addprefix help-,$(board-dirs))
1227 help-boards: $(help-board-dirs)
1229 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1231 $(help-board-dirs): help-%:
1232 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1233 @$(if $(boards-per-dir), \
1234 $(foreach b, $(boards-per-dir), \
1235 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1239 # Documentation targets
1240 # ---------------------------------------------------------------------------
1241 %docs: scripts_basic FORCE
1242 $(Q)$(MAKE) $(build)=scripts build_docproc
1243 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1245 else # KBUILD_EXTMOD
1248 # External module support.
1249 # When building external modules the kernel used as basis is considered
1250 # read-only, and no consistency checks are made and the make
1251 # system is not used on the basis kernel. If updates are required
1252 # in the basis kernel ordinary make commands (without M=...) must
1255 # The following are the only valid targets when building external
1257 # make M=dir clean Delete all automatically generated files
1258 # make M=dir modules Make all modules in specified dir
1259 # make M=dir Same as 'make M=dir modules'
1260 # make M=dir modules_install
1261 # Install the modules built in the module directory
1262 # Assumes install directory is already created
1264 # We are always building modules
1266 PHONY += crmodverdir
1270 PHONY += $(objtree)/Module.symvers
1271 $(objtree)/Module.symvers:
1272 @test -e $(objtree)/Module.symvers || ( \
1274 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1275 echo " is missing; modules will have no dependencies and modversions."; \
1278 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1279 PHONY += $(module-dirs) modules
1280 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1281 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1283 modules: $(module-dirs)
1284 @$(kecho) ' Building modules, stage 2.';
1285 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1287 PHONY += modules_install
1288 modules_install: _emodinst_ _emodinst_post
1290 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1293 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1294 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1296 PHONY += _emodinst_post
1297 _emodinst_post: _emodinst_
1300 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1302 PHONY += $(clean-dirs) clean
1304 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1306 clean: rm-dirs := $(MODVERDIR)
1307 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1310 @echo ' Building external modules.'
1311 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1313 @echo ' modules - default target, build the module(s)'
1314 @echo ' modules_install - install the module'
1315 @echo ' clean - remove generated files in module directory only'
1319 PHONY += prepare scripts
1322 endif # KBUILD_EXTMOD
1324 clean: $(clean-dirs)
1327 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1328 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1330 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1331 -o -name '*.symtypes' -o -name 'modules.order' \
1332 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1333 -o -name '*.gcno' \) -type f -print | xargs rm -f
1335 # Generate tags for editors
1336 # ---------------------------------------------------------------------------
1337 quiet_cmd_tags = GEN $@
1338 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1340 tags TAGS cscope gtags: FORCE
1343 # Scripts to check various things for consistency
1344 # ---------------------------------------------------------------------------
1346 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1349 find $(srctree)/* $(RCS_FIND_IGNORE) \
1350 -name '*.[hcS]' -type f -print | sort \
1351 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1354 find $(srctree)/* $(RCS_FIND_IGNORE) \
1355 -name '*.[hcS]' -type f -print | sort \
1356 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1359 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1362 $(PERL) $(srctree)/scripts/namespace.pl
1365 $(PERL) $(srctree)/scripts/export_report.pl
1367 endif #ifeq ($(config-targets),1)
1368 endif #ifeq ($(mixed-targets),1)
1370 PHONY += checkstack kernelrelease kernelversion image_name
1372 # UML needs a little special treatment here. It wants to use the host
1373 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1374 # else wants $(ARCH), including people doing cross-builds, which means
1375 # that $(SUBARCH) doesn't work here.
1377 CHECKSTACK_ARCH := $(SUBARCH)
1379 CHECKSTACK_ARCH := $(ARCH)
1382 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1383 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1386 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1389 @echo $(KERNELVERSION)
1392 @echo $(KBUILD_IMAGE)
1394 # Clear a bunch of variables before executing the submake
1396 $(Q)mkdir -p $(objtree)/tools
1397 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1400 $(Q)mkdir -p $(objtree)/tools
1401 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1404 # ---------------------------------------------------------------------------
1405 # Single targets are compatible with:
1406 # - build with mixed source and output
1407 # - build with separate output dir 'make O=...'
1408 # - external modules
1410 # target-dir => where to store outputfile
1411 # build-dir => directory in kernel source tree to use
1413 ifeq ($(KBUILD_EXTMOD),)
1414 build-dir = $(patsubst %/,%,$(dir $@))
1415 target-dir = $(dir $@)
1417 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1418 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1419 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1422 %.s: %.c prepare scripts FORCE
1423 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1424 %.i: %.c prepare scripts FORCE
1425 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1426 %.o: %.c prepare scripts FORCE
1427 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1428 %.lst: %.c prepare scripts FORCE
1429 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1430 %.s: %.S prepare scripts FORCE
1431 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1432 %.o: %.S prepare scripts FORCE
1433 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1434 %.symtypes: %.c prepare scripts FORCE
1435 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1438 /: prepare scripts FORCE
1440 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1441 $(build)=$(build-dir)
1442 %/: prepare scripts FORCE
1444 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1445 $(build)=$(build-dir)
1446 %.ko: prepare scripts FORCE
1448 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1449 $(build)=$(build-dir) $(@:.ko=.o)
1450 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1452 # FIXME Should go into a make.lib or something
1453 # ===========================================================================
1455 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1456 cmd_rmdirs = rm -rf $(rm-dirs)
1458 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1459 cmd_rmfiles = rm -f $(rm-files)
1461 # Run depmod only if we have System.map and depmod is executable
1462 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1463 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1464 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1466 # Create temporary dir for module support files
1467 # clean it up only when building all modules
1468 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1469 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1471 # read all saved command lines
1473 targets := $(wildcard $(sort $(targets)))
1474 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1476 ifneq ($(cmd_files),)
1477 $(cmd_files): ; # Do not try to update included dependency files
1478 include $(cmd_files)
1481 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1483 # $(Q)$(MAKE) $(clean)=dir
1484 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1486 endif # skip-makefile
1491 # Declare the contents of the .PHONY variable as phony. We keep that
1492 # information in a variable so we can use it in if_changed and friends.