5 NAME = Blurry Fish Butt
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.
13 # o Do not use make's built-in rules and variables
14 # (this increases performance and avoids hard-to-debug behaviour);
15 # o Look for make include files relative to root of kernel src
16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
18 # Avoid funny character set dependencies
22 export LC_COLLATE LC_NUMERIC
24 # Avoid interference with shell env settings
27 # We are using a recursive build, so we need to do a little thinking
28 # to get the ordering right.
30 # Most importantly: sub-Makefiles should only ever modify files in
31 # their own directory. If in some directory we have a dependency on
32 # a file in another dir (which doesn't happen often, but it's often
33 # unavoidable when linking the built-in.o targets which finally
34 # turn into vmlinux), we will call a sub make in that other dir, and
35 # after that we are sure that everything which is in that other dir
38 # The only cases where we need to modify files which have global
39 # effects are thus separated out and done before the recursive
40 # descending is started. They are now explicitly listed as the
44 # ---------------------------------------------------------------------------
46 # Normally, we echo the whole command before executing it. By making
47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
48 # $(quiet) to choose other forms of output instead, e.g.
50 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
53 # If $(quiet) is empty, the whole command will be printed.
54 # If it is set to "quiet_", only the short version will be printed.
55 # If it is set to "silent_", nothing will be printed at all, since
56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
58 # A simple variant is to prefix commands with $(Q) - that's useful
59 # for commands that shall be hidden in non-verbose mode.
63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
66 # To put more focus on warnings, be less verbose as default
67 # Use 'make V=1' to see the full commands
69 ifeq ("$(origin V)", "command line")
76 ifeq ($(KBUILD_VERBOSE),1)
84 # If the user is running make -s (silent mode), suppress echoing of
87 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
97 export quiet Q KBUILD_VERBOSE
99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
103 # Use "make O=dir/to/store/output/files/"
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
114 # KBUILD_SRC is set on invocation of make in OBJ directory
115 # KBUILD_SRC is not intended to be used by the regular user (for now)
116 ifeq ($(KBUILD_SRC),)
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
124 # That's our default target when none is given on the command line
128 # Cancel implicit rules on top Makefile
129 $(CURDIR)/Makefile Makefile: ;
131 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
132 $(error main directory cannot contain spaces nor colons)
135 ifneq ($(KBUILD_OUTPUT),)
136 # Invoke a second make in the output directory, passing relevant variables
137 # check that the output directory actually exists
138 saved-output := $(KBUILD_OUTPUT)
139 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
141 $(if $(KBUILD_OUTPUT),, \
142 $(error failed to create output directory "$(saved-output)"))
144 PHONY += $(MAKECMDGOALS) sub-make
146 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
150 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
151 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
153 # Leave processing to above invocation of make
155 endif # ifneq ($(KBUILD_OUTPUT),)
156 endif # ifeq ($(KBUILD_SRC),)
158 # We process the rest of the Makefile if this is the final invocation of make
159 ifeq ($(skip-makefile),)
161 # Do not print "Entering directory ...",
162 # but we want to display it when entering to the output directory
163 # so that IDEs/editors are able to understand relative filenames.
164 MAKEFLAGS += --no-print-directory
166 # Call a source code checker (by default, "sparse") as part of the
169 # Use 'make C=1' to enable checking of only re-compiled files.
170 # Use 'make C=2' to enable checking of *all* source files, regardless
171 # of whether they are re-compiled or not.
173 # See the file "Documentation/sparse.txt" for more details, including
174 # where to get the "sparse" utility.
176 ifeq ("$(origin C)", "command line")
177 KBUILD_CHECKSRC = $(C)
179 ifndef KBUILD_CHECKSRC
183 # Use make M=dir to specify directory of external module to build
184 # Old syntax make ... SUBDIRS=$PWD is still supported
185 # Setting the environment variable KBUILD_EXTMOD take precedence
187 KBUILD_EXTMOD ?= $(SUBDIRS)
190 ifeq ("$(origin M)", "command line")
191 KBUILD_EXTMOD := $(M)
194 # If building an external module we do not care about the all: rule
195 # but instead _all depend on modules
197 ifeq ($(KBUILD_EXTMOD),)
203 ifeq ($(KBUILD_SRC),)
204 # building in the source tree
207 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
208 # building in a subdirectory of the source tree
211 srctree := $(KBUILD_SRC)
218 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
220 export srctree objtree VPATH
222 # SUBARCH tells the usermode build what the underlying arch is. That is set
223 # first, and if a usermode build is happening, the "ARCH=um" on the command
224 # line overrides the setting of ARCH below. If a native build is happening,
225 # then ARCH is assigned, getting whatever value it gets normally, and
226 # SUBARCH is subsequently ignored.
228 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
229 -e s/sun4u/sparc64/ \
230 -e s/arm.*/arm/ -e s/sa110/arm/ \
231 -e s/s390x/s390/ -e s/parisc64/parisc/ \
232 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
233 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
235 # Cross compiling and selecting different set of gcc/bin-utils
236 # ---------------------------------------------------------------------------
238 # When performing cross compilation for other architectures ARCH shall be set
239 # to the target architecture. (See arch/* for the possibilities).
240 # ARCH can be set during invocation of make:
242 # Another way is to have ARCH set in the environment.
243 # The default ARCH is the host where make is executed.
245 # CROSS_COMPILE specify the prefix used for all executables used
246 # during compilation. Only gcc and related bin-utils executables
247 # are prefixed with $(CROSS_COMPILE).
248 # CROSS_COMPILE can be set on the command line
249 # make CROSS_COMPILE=ia64-linux-
250 # Alternatively CROSS_COMPILE can be set in the environment.
251 # A third alternative is to store a setting in .config so that plain
252 # "make" in the configured kernel build directory always uses that.
253 # Default value for CROSS_COMPILE is not to prefix executables
254 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
258 ifneq ($(wildcard $(srctree)/../prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9),)
259 CROSS_COMPILE ?= $(srctree)/../prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-
262 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
264 # Architecture as present in compile.h
265 UTS_MACHINE := $(ARCH)
268 # Additional ARCH settings for x86
272 ifeq ($(ARCH),x86_64)
276 # Additional ARCH settings for sparc
277 ifeq ($(ARCH),sparc32)
280 ifeq ($(ARCH),sparc64)
284 # Additional ARCH settings for sh
289 # Additional ARCH settings for tile
290 ifeq ($(ARCH),tilepro)
293 ifeq ($(ARCH),tilegx)
297 # Where to locate arch specific headers
298 hdr-arch := $(SRCARCH)
300 KCONFIG_CONFIG ?= .config
301 export KCONFIG_CONFIG
303 # SHELL used by kbuild
304 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
305 else if [ -x /bin/bash ]; then echo /bin/bash; \
306 else echo sh; fi ; fi)
310 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
313 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
314 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
315 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
318 # Decide whether to build built-in, modular, or both.
319 # Normally, just do built-in.
324 # If we have only "make modules", don't compile built-in objects.
325 # When we're building modules with modversions, we need to consider
326 # the built-in objects during the descend as well, in order to
327 # make sure the checksums are up to date before we record them.
329 ifeq ($(MAKECMDGOALS),modules)
330 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
333 # If we have "make <whatever> modules", compile modules
334 # in addition to whatever we do anyway.
335 # Just "make" or "make all" shall build modules as well
337 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
341 ifeq ($(MAKECMDGOALS),)
345 export KBUILD_MODULES KBUILD_BUILTIN
346 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
348 # We need some generic definitions (do not try to remake the file).
349 scripts/Kbuild.include: ;
350 include scripts/Kbuild.include
352 # Make variables (CC, etc...)
353 AS = $(CROSS_COMPILE)as
354 LD = $(CROSS_COMPILE)ld
355 CC = $(CROSS_COMPILE)gcc
357 AR = $(CROSS_COMPILE)ar
358 NM = $(CROSS_COMPILE)nm
359 STRIP = $(CROSS_COMPILE)strip
360 OBJCOPY = $(CROSS_COMPILE)objcopy
361 OBJDUMP = $(CROSS_COMPILE)objdump
363 GENKSYMS = scripts/genksyms/genksyms
364 INSTALLKERNEL := installkernel
365 DEPMOD = /sbin/depmod
370 # Use the wrapper for the compiler. This wrapper scans for new
371 # warnings and causes the build to stop upon encountering them.
372 ifneq ($(wildcard $(srctree)/scripts/gcc-wrapper.py),)
373 CC = $(srctree)/scripts/gcc-wrapper.py $(CROSS_COMPILE)gcc
376 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
377 -Wbitwise -Wno-return-void $(CF)
383 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
386 # Use USERINCLUDE when you must reference the UAPI directories only.
388 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
389 -Iarch/$(hdr-arch)/include/generated/uapi \
390 -I$(srctree)/include/uapi \
391 -Iinclude/generated/uapi \
392 -include $(srctree)/include/linux/kconfig.h
394 # Use LINUXINCLUDE when you must reference the include/ directory.
395 # Needed to be compatible with the O= option
397 -I$(srctree)/arch/$(hdr-arch)/include \
398 -Iarch/$(hdr-arch)/include/generated/uapi \
399 -Iarch/$(hdr-arch)/include/generated \
400 $(if $(KBUILD_SRC), -I$(srctree)/include) \
404 KBUILD_CPPFLAGS := -D__KERNEL__
406 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
407 -fno-strict-aliasing -fno-common \
408 -Werror-implicit-function-declaration \
409 -Wno-format-security \
410 -std=gnu89 $(call cc-option,-fno-PIE)
413 KBUILD_AFLAGS_KERNEL :=
414 KBUILD_CFLAGS_KERNEL :=
415 KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
416 KBUILD_AFLAGS_MODULE := -DMODULE
417 KBUILD_CFLAGS_MODULE := -DMODULE
418 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
420 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
421 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
422 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
424 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
425 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
426 export CPP AR NM STRIP OBJCOPY OBJDUMP
427 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
428 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
430 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
431 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
432 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
433 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
434 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
435 export KBUILD_ARFLAGS
437 # When compiling out-of-tree modules, put MODVERDIR in the module
438 # tree rather than in the kernel tree. The kernel tree might
440 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
442 # Files to ignore in find ... statements
444 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
445 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
447 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
448 --exclude CVS --exclude .pc --exclude .hg --exclude .git
450 # ===========================================================================
451 # Rules shared between *config targets and build targets
453 # Basic helpers built in scripts/
454 PHONY += scripts_basic
456 $(Q)$(MAKE) $(build)=scripts/basic
457 $(Q)rm -f .tmp_quiet_recordmcount
459 # To avoid any implicit rule to kick in, define an empty command.
460 scripts/basic/%: scripts_basic ;
462 PHONY += outputmakefile
463 # outputmakefile generates a Makefile in the output directory, if using a
464 # separate output directory. This allows convenient use of make in the
467 ifneq ($(KBUILD_SRC),)
468 $(Q)ln -fsn $(srctree) source
469 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
470 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
473 # Support for using generic headers in asm-generic
476 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
477 src=asm obj=arch/$(SRCARCH)/include/generated/asm
478 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
479 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
481 # To make sure we do not include .config for any of the *config targets
482 # catch them early, and hand them over to scripts/kconfig/Makefile
483 # It is allowed to specify more targets when calling make, including
484 # mixing *config targets and build targets.
485 # For example 'make oldconfig all'.
486 # Detect when mixed targets is specified, and make a second invocation
487 # of make so .config is not included in this case either (for *config).
489 version_h := include/generated/uapi/linux/version.h
490 old_version_h := include/linux/version.h
492 no-dot-config-targets := clean mrproper distclean \
493 cscope gtags TAGS tags help% %docs check% coccicheck \
494 $(version_h) headers_% archheaders archscripts \
495 kernelversion %src-pkg
501 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
502 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
507 ifeq ($(KBUILD_EXTMOD),)
508 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
510 ifneq ($(words $(MAKECMDGOALS)),1)
515 # install and module_install need also be processed one by one
516 ifneq ($(filter install,$(MAKECMDGOALS)),)
517 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
522 ifeq ($(mixed-targets),1)
523 # ===========================================================================
524 # We're called with mixed targets (*config and build targets).
525 # Handle them one by one.
527 PHONY += $(MAKECMDGOALS) __build_one_by_one
529 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
534 for i in $(MAKECMDGOALS); do \
535 $(MAKE) -f $(srctree)/Makefile $$i; \
539 ifeq ($(config-targets),1)
540 # ===========================================================================
541 # *config targets only - make sure prerequisites are updated, and descend
542 # in scripts/kconfig to make the *config target
544 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
545 # KBUILD_DEFCONFIG may point out an alternative default configuration
546 # used for 'make defconfig'
547 include arch/$(SRCARCH)/Makefile
548 export KBUILD_DEFCONFIG KBUILD_KCONFIG
550 config: scripts_basic outputmakefile FORCE
551 $(Q)$(MAKE) $(build)=scripts/kconfig $@
553 %config: scripts_basic outputmakefile FORCE
554 $(Q)$(MAKE) $(build)=scripts/kconfig $@
557 # ===========================================================================
558 # Build targets only - this includes vmlinux, arch specific targets, clean
559 # targets and others. In general all targets except *config targets.
561 ifeq ($(KBUILD_EXTMOD),)
562 # Additional helpers built in scripts/
563 # Carefully list dependencies so we do not try to build scripts twice
566 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
568 $(Q)$(MAKE) $(build)=$(@)
570 # Objects we will link into vmlinux / subdirs we need to visit
572 drivers-y := drivers/ sound/ firmware/
577 endif # KBUILD_EXTMOD
579 ifeq ($(dot-config),1)
581 -include include/config/auto.conf
583 ifeq ($(KBUILD_EXTMOD),)
584 # Read in dependencies to all Kconfig* files, make sure to run
585 # oldconfig if changes are detected.
586 -include include/config/auto.conf.cmd
588 # To avoid any implicit rule to kick in, define an empty command
589 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
591 # If .config is newer than include/config/auto.conf, someone tinkered
592 # with it and forgot to run make oldconfig.
593 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
594 # we execute the config step to be sure to catch updated Kconfig files
595 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
596 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
598 # external modules needs include/generated/autoconf.h and include/config/auto.conf
599 # but do not care if they are up-to-date. Use auto.conf to trigger the test
600 PHONY += include/config/auto.conf
602 include/config/auto.conf:
603 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
605 echo >&2 " ERROR: Kernel configuration is invalid."; \
606 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
607 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
611 endif # KBUILD_EXTMOD
614 # Dummy target needed, because used as prerequisite
615 include/config/auto.conf: ;
616 endif # $(dot-config)
618 # The all: target is the default when no target is given on the
620 # This allow a user to issue only 'make' to build a kernel including modules
621 # Defaults to vmlinux, but the arch makefile usually adds further targets
624 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
625 # values of the respective KBUILD_* variables
629 include arch/$(SRCARCH)/Makefile
631 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
632 KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
633 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
635 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
638 ifdef CONFIG_PROFILE_ALL_BRANCHES
645 # Tell gcc to never replace conditional load with a non-conditional one
646 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
648 ifdef CONFIG_READABLE_ASM
649 # Disable optimizations that make assembler listings hard to read.
650 # reorder blocks reorders the control in the function
651 # ipa clone creates specialized cloned functions
652 # partial inlining inlines only parts of functions
653 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
654 $(call cc-option,-fno-ipa-cp-clone,) \
655 $(call cc-option,-fno-partial-inlining)
658 ifneq ($(CONFIG_FRAME_WARN),0)
659 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
662 # Handle stack protector mode.
664 # Since kbuild can potentially perform two passes (first with the old
665 # .config values and then with updated .config values), we cannot error out
666 # if a desired compiler option is unsupported. If we were to error, kbuild
667 # could never get to the second pass and actually notice that we changed
668 # the option to something that was supported.
670 # Additionally, we don't want to fallback and/or silently change which compiler
671 # flags will be used, since that leads to producing kernels with different
672 # security feature characteristics depending on the compiler used. ("But I
673 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
675 # The middle ground is to warn here so that the failed option is obvious, but
676 # to let the build fail with bad compiler flags so that we can't produce a
677 # kernel when there is a CONFIG and compiler mismatch.
679 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
680 stackp-flag := -fstack-protector
681 ifeq ($(call cc-option, $(stackp-flag)),)
682 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
683 -fstack-protector not supported by compiler)
686 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
687 stackp-flag := -fstack-protector-strong
688 ifeq ($(call cc-option, $(stackp-flag)),)
689 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
690 -fstack-protector-strong not supported by compiler)
693 # Force off for distro compilers that enable stack protector by default.
694 stackp-flag := $(call cc-option, -fno-stack-protector)
697 KBUILD_CFLAGS += $(stackp-flag)
699 ifeq ($(cc-name),clang)
700 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
701 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
702 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
703 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
704 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
705 # Quiet clang warning: comparison of unsigned expression < 0 is always false
706 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
707 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
708 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
709 # See modpost pattern 2
710 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
711 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
714 # These warnings generated too much noise in a regular build.
715 # Use make W=1 to enable them (see scripts/Makefile.build)
716 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
717 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
720 ifdef CONFIG_FRAME_POINTER
721 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
723 # Some targets (ARM with Thumb2, for example), can't be built with frame
724 # pointers. For those, we don't have FUNCTION_TRACER automatically
725 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
726 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
727 # -fomit-frame-pointer with FUNCTION_TRACER.
728 ifndef CONFIG_FUNCTION_TRACER
729 KBUILD_CFLAGS += -fomit-frame-pointer
733 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
735 ifdef CONFIG_DEBUG_INFO
736 ifdef CONFIG_DEBUG_INFO_SPLIT
737 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
741 KBUILD_AFLAGS += -Wa,-gdwarf-2
743 ifdef CONFIG_DEBUG_INFO_DWARF4
744 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
747 ifdef CONFIG_DEBUG_INFO_REDUCED
748 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
749 $(call cc-option,-fno-var-tracking)
752 ifdef CONFIG_FUNCTION_TRACER
753 ifndef CC_FLAGS_FTRACE
754 CC_FLAGS_FTRACE := -pg
756 export CC_FLAGS_FTRACE
757 ifdef CONFIG_HAVE_FENTRY
758 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
760 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
761 KBUILD_AFLAGS += $(CC_USING_FENTRY)
762 ifdef CONFIG_DYNAMIC_FTRACE
763 ifdef CONFIG_HAVE_C_RECORDMCOUNT
764 BUILD_C_RECORDMCOUNT := y
765 export BUILD_C_RECORDMCOUNT
770 # We trigger additional mismatches with less inlining
771 ifdef CONFIG_DEBUG_SECTION_MISMATCH
772 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
775 # arch Makefile may override CC so keep this after arch Makefile is included
776 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
777 CHECKFLAGS += $(NOSTDINC_FLAGS)
779 # warn about C99 declaration after statement
780 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
782 # disable pointer signed / unsigned warnings in gcc 4.0
783 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
785 # disable invalid "can't wrap" optimizations for signed / pointers
786 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
788 # conserve stack if available
789 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
791 # disallow errors like 'EXPORT_GPL(foo);' with missing header
792 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
794 # require functions to have arguments in prototypes, not empty 'int foo()'
795 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
797 # Prohibit date/time macros, which would make the build non-deterministic
798 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
800 # use the deterministic mode of AR if available
801 KBUILD_ARFLAGS := $(call ar-option,D)
803 # check for 'asm goto'
804 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
805 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
806 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
807 else ifneq ($(findstring aarch64-linux-android, $(CROSS_COMPILE)),)
808 # It seems than android gcc can't pass gcc-goto.sh check, but asm goto work.
809 # So let's active it.
810 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
811 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
814 include scripts/Makefile.kasan
815 include scripts/Makefile.extrawarn
817 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
819 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
820 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
821 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
823 # Use --build-id when available.
824 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
825 $(call cc-ldoption, -Wl$(comma)--build-id,))
826 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
827 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
829 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
830 LDFLAGS_vmlinux += $(call ld-option, -X,)
833 # Default kernel image to build when no specific target is given.
834 # KBUILD_IMAGE may be overruled on the command line or
835 # set in the environment
836 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
838 export KBUILD_IMAGE ?= vmlinux
841 # INSTALL_PATH specifies where to place the updated kernel and system map
842 # images. Default is /boot, but you can set it to other values
843 export INSTALL_PATH ?= /boot
846 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
847 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
848 # an argument if needed. Otherwise it defaults to the kernel install path
850 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
853 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
854 # relocations required by build roots. This is not defined in the
855 # makefile but the argument can be passed to make if needed.
858 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
862 # INSTALL_MOD_STRIP, if defined, will cause modules to be
863 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
864 # the default option --strip-debug will be used. Otherwise,
865 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
867 ifdef INSTALL_MOD_STRIP
868 ifeq ($(INSTALL_MOD_STRIP),1)
869 mod_strip_cmd = $(STRIP) --strip-debug
871 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
872 endif # INSTALL_MOD_STRIP=1
875 endif # INSTALL_MOD_STRIP
878 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
879 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
880 # or CONFIG_MODULE_COMPRESS_XZ.
882 mod_compress_cmd = true
883 ifdef CONFIG_MODULE_COMPRESS
884 ifdef CONFIG_MODULE_COMPRESS_GZIP
885 mod_compress_cmd = gzip -n -f
886 endif # CONFIG_MODULE_COMPRESS_GZIP
887 ifdef CONFIG_MODULE_COMPRESS_XZ
888 mod_compress_cmd = xz -f
889 endif # CONFIG_MODULE_COMPRESS_XZ
890 endif # CONFIG_MODULE_COMPRESS
891 export mod_compress_cmd
893 # Select initial ramdisk compression format, default is gzip(1).
894 # This shall be used by the dracut(8) tool while creating an initramfs image.
896 INITRD_COMPRESS-y := gzip
897 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
898 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
899 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
900 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
901 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
902 # do not export INITRD_COMPRESS, since we didn't actually
903 # choose a sane default compression above.
904 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
906 ifdef CONFIG_MODULE_SIG_ALL
907 $(eval $(call config_filename,MODULE_SIG_KEY))
909 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
916 ifeq ($(KBUILD_EXTMOD),)
917 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
919 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
920 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
921 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
923 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
924 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
926 init-y := $(patsubst %/, %/built-in.o, $(init-y))
927 core-y := $(patsubst %/, %/built-in.o, $(core-y))
928 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
929 net-y := $(patsubst %/, %/built-in.o, $(net-y))
930 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
931 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
932 libs-y := $(libs-y1) $(libs-y2)
933 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
935 # Externally visible symbols (used by link-vmlinux.sh)
936 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
937 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
938 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
939 export LDFLAGS_vmlinux
940 # used by scripts/pacmage/Makefile
941 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
943 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
945 # Final link of vmlinux
946 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
947 quiet_cmd_link-vmlinux = LINK $@
949 # Include targets which we want to
950 # execute if the rest of the kernel build went well.
951 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
952 ifdef CONFIG_HEADERS_CHECK
953 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
956 $(Q)$(MAKE) $(build)=samples
958 ifdef CONFIG_BUILD_DOCSRC
959 $(Q)$(MAKE) $(build)=Documentation
961 ifdef CONFIG_GDB_SCRIPTS
962 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
964 +$(call if_changed,link-vmlinux)
966 # The actual objects are generated when descending,
967 # make sure no implicit rule kicks in
968 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
970 # Handle descending into subdirectories listed in $(vmlinux-dirs)
971 # Preset locale variables to speed up the build process. Limit locale
972 # tweaks to this spot to avoid wrong language settings when running
973 # make menuconfig etc.
974 # Error messages still appears in the original language
976 PHONY += $(vmlinux-dirs)
977 $(vmlinux-dirs): prepare scripts
978 $(Q)$(MAKE) $(build)=$@
980 define filechk_kernel.release
981 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
984 # Store (new) KERNELRELEASE string in include/config/kernel.release
985 include/config/kernel.release: include/config/auto.conf FORCE
986 $(call filechk,kernel.release)
989 # Things we need to do before we recursively start building the kernel
990 # or the modules are listed in "prepare".
991 # A multi level approach is used. prepareN is processed before prepareN-1.
992 # archprepare is used in arch Makefiles and when processed asm symlink,
993 # version.h and scripts_basic is processed / created.
995 # Listed in dependency order
996 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
998 # prepare3 is used to check if we are building in a separate output directory,
1000 # 1) Check that make has not been executed in the kernel src $(srctree)
1001 prepare3: include/config/kernel.release
1002 ifneq ($(KBUILD_SRC),)
1003 @$(kecho) ' Using $(srctree) as source for kernel'
1004 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1005 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1006 echo >&2 " in the '$(srctree)' directory.";\
1011 # prepare2 creates a makefile if using a separate output directory
1012 prepare2: prepare3 outputmakefile asm-generic
1014 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1015 include/config/auto.conf
1018 archprepare: archheaders archscripts prepare1 scripts_basic
1020 prepare0: archprepare FORCE
1021 $(Q)$(MAKE) $(build)=.
1023 # All the preparing..
1026 # Generate some files
1027 # ---------------------------------------------------------------------------
1029 # KERNELRELEASE can change from a few different places, meaning version.h
1030 # needs to be updated, so this check is forced on all builds
1033 define filechk_utsrelease.h
1034 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1035 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1038 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1041 define filechk_version.h
1042 (echo \#define LINUX_VERSION_CODE $(shell \
1043 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1044 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1047 $(version_h): $(srctree)/Makefile FORCE
1048 $(call filechk,version.h)
1049 $(Q)rm -f $(old_version_h)
1051 include/generated/utsrelease.h: include/config/kernel.release FORCE
1052 $(call filechk,utsrelease.h)
1056 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1057 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1059 # ---------------------------------------------------------------------------
1061 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1062 export INSTALL_FW_PATH
1064 PHONY += firmware_install
1065 firmware_install: FORCE
1066 @mkdir -p $(objtree)/firmware
1067 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1069 # ---------------------------------------------------------------------------
1072 #Default location for installed headers
1073 export INSTALL_HDR_PATH = $(objtree)/usr
1075 # If we do an all arch process set dst to asm-$(hdr-arch)
1076 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1078 PHONY += archheaders
1081 PHONY += archscripts
1085 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1086 $(Q)$(MAKE) $(build)=scripts build_unifdef
1088 PHONY += headers_install_all
1089 headers_install_all:
1090 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1092 PHONY += headers_install
1093 headers_install: __headers
1094 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1095 $(error Headers not exportable for the $(SRCARCH) architecture))
1096 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1097 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1099 PHONY += headers_check_all
1100 headers_check_all: headers_install_all
1101 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1103 PHONY += headers_check
1104 headers_check: headers_install
1105 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1106 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1108 # ---------------------------------------------------------------------------
1113 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1116 $(Q)$(MAKE) -C tools/testing/selftests clean
1118 # ---------------------------------------------------------------------------
1121 ifdef CONFIG_MODULES
1123 # By default, build modules as well
1129 # A module can be listed more than once in obj-m resulting in
1130 # duplicate lines in modules.order files. Those are removed
1131 # using awk while concatenating to the final file.
1134 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1135 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1136 @$(kecho) ' Building modules, stage 2.';
1137 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1138 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1140 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1141 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1143 %/modules.builtin: include/config/auto.conf
1144 $(Q)$(MAKE) $(modbuiltin)=$*
1147 # Target to prepare building external modules
1148 PHONY += modules_prepare
1149 modules_prepare: prepare scripts
1151 # Target to install modules
1152 PHONY += modules_install
1153 modules_install: _modinst_ _modinst_post
1157 @rm -rf $(MODLIB)/kernel
1158 @rm -f $(MODLIB)/source
1159 @mkdir -p $(MODLIB)/kernel
1160 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1161 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1162 rm -f $(MODLIB)/build ; \
1163 ln -s $(CURDIR) $(MODLIB)/build ; \
1165 @cp -f $(objtree)/modules.order $(MODLIB)/
1166 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1167 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1169 # This depmod is only for convenience to give the initial
1170 # boot a modules.dep even before / is mounted read-write. However the
1171 # boot script depmod is the master version.
1172 PHONY += _modinst_post
1173 _modinst_post: _modinst_
1174 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1177 ifeq ($(CONFIG_MODULE_SIG), y)
1178 PHONY += modules_sign
1180 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1183 else # CONFIG_MODULES
1185 # Modules not configured
1186 # ---------------------------------------------------------------------------
1188 modules modules_install: FORCE
1190 @echo >&2 "The present kernel configuration has modules disabled."
1191 @echo >&2 "Type 'make config' and enable loadable module support."
1192 @echo >&2 "Then build a kernel with module support enabled."
1196 endif # CONFIG_MODULES
1199 # Cleaning is done on three levels.
1200 # make clean Delete most generated files
1201 # Leave enough to build external modules
1202 # make mrproper Delete the current configuration, and all generated files
1203 # make distclean Remove editor backup files, patch leftover files and the like
1205 # Directories & files removed with 'make clean'
1206 CLEAN_DIRS += $(MODVERDIR)
1208 # Directories & files removed with 'make mrproper'
1209 MRPROPER_DIRS += include/config usr/include include/generated \
1210 arch/*/include/generated .tmp_objdiff
1211 MRPROPER_FILES += .config .config.old .version .old_version \
1212 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1213 signing_key.pem signing_key.priv signing_key.x509 \
1214 x509.genkey extra_certificates signing_key.x509.keyid \
1215 signing_key.x509.signer vmlinux-gdb.py
1217 # clean - Delete most, but leave enough to build external modules
1219 clean: rm-dirs := $(CLEAN_DIRS)
1220 clean: rm-files := $(CLEAN_FILES)
1221 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1223 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1225 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1228 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1230 clean: archclean vmlinuxclean
1232 # mrproper - Delete all generated files, including .config
1234 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1235 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1236 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1238 PHONY += $(mrproper-dirs) mrproper archmrproper
1240 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1242 mrproper: clean archmrproper $(mrproper-dirs)
1251 @find $(srctree) $(RCS_FIND_IGNORE) \
1252 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1253 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1254 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1255 -type f -print | xargs rm -f
1258 # Packaging of the kernel to various formats
1259 # ---------------------------------------------------------------------------
1260 # rpm target kept for backward compatibility
1261 package-dir := scripts/package
1264 $(Q)$(MAKE) $(build)=$(package-dir) $@
1265 %pkg: include/config/kernel.release FORCE
1266 $(Q)$(MAKE) $(build)=$(package-dir) $@
1267 rpm: include/config/kernel.release FORCE
1268 $(Q)$(MAKE) $(build)=$(package-dir) $@
1271 # Brief documentation of the typical targets used
1272 # ---------------------------------------------------------------------------
1274 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1275 boards := $(sort $(notdir $(boards)))
1276 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1277 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1280 @echo 'Cleaning targets:'
1281 @echo ' clean - Remove most generated files but keep the config and'
1282 @echo ' enough build support to build external modules'
1283 @echo ' mrproper - Remove all generated files + config + various backup files'
1284 @echo ' distclean - mrproper + remove editor backup and patch files'
1286 @echo 'Configuration targets:'
1287 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1289 @echo 'Other generic targets:'
1290 @echo ' all - Build all targets marked with [*]'
1291 @echo '* vmlinux - Build the bare kernel'
1292 @echo '* modules - Build all modules'
1293 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1294 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1295 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1296 @echo ' dir/ - Build all files in dir and below'
1297 @echo ' dir/file.[ois] - Build specified target only'
1298 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1299 @echo ' (requires a recent binutils and recent build (System.map))'
1300 @echo ' dir/file.ko - Build module including final link'
1301 @echo ' modules_prepare - Set up for building external modules'
1302 @echo ' tags/TAGS - Generate tags file for editors'
1303 @echo ' cscope - Generate cscope index'
1304 @echo ' gtags - Generate GNU GLOBAL index'
1305 @echo ' kernelrelease - Output the release version string (use with make -s)'
1306 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1307 @echo ' image_name - Output the image name (use with make -s)'
1308 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1309 echo ' (default: $(INSTALL_HDR_PATH))'; \
1311 @echo 'Static analysers'
1312 @echo ' checkstack - Generate a list of stack hogs'
1313 @echo ' namespacecheck - Name space analysis on compiled kernel'
1314 @echo ' versioncheck - Sanity check on version.h usage'
1315 @echo ' includecheck - Check for duplicate included header files'
1316 @echo ' export_report - List the usages of all exported symbols'
1317 @echo ' headers_check - Sanity check on exported headers'
1318 @echo ' headerdep - Detect inclusion cycles in headers'
1319 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1321 @echo 'Kernel selftest'
1322 @echo ' kselftest - Build and run kernel selftest (run as root)'
1323 @echo ' Build, install, and boot kernel before'
1324 @echo ' running kselftest on it'
1325 @echo ' kselftest-clean - Remove all generated kselftest files'
1327 @echo 'Kernel packaging:'
1328 @$(MAKE) $(build)=$(package-dir) help
1330 @echo 'Documentation targets:'
1331 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1333 @echo 'Architecture specific targets ($(SRCARCH)):'
1334 @$(if $(archhelp),$(archhelp),\
1335 echo ' No architecture specific help defined for $(SRCARCH)')
1338 $(foreach b, $(boards), \
1339 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1341 @$(if $(board-dirs), \
1342 $(foreach b, $(board-dirs), \
1343 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1344 printf " %-16s - Show all of the above\\n" help-boards; \
1347 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1348 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1349 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1350 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1351 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1352 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1353 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1354 @echo ' 1: warnings which may be relevant and do not occur too often'
1355 @echo ' 2: warnings which occur quite often but may still be relevant'
1356 @echo ' 3: more obscure warnings, can most likely be ignored'
1357 @echo ' Multiple levels can be combined with W=12 or W=123'
1359 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1360 @echo 'For further info see the ./README file'
1363 help-board-dirs := $(addprefix help-,$(board-dirs))
1365 help-boards: $(help-board-dirs)
1367 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1369 $(help-board-dirs): help-%:
1370 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1371 @$(if $(boards-per-dir), \
1372 $(foreach b, $(boards-per-dir), \
1373 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1377 # Documentation targets
1378 # ---------------------------------------------------------------------------
1379 %docs: scripts_basic FORCE
1380 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1381 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1383 else # KBUILD_EXTMOD
1386 # External module support.
1387 # When building external modules the kernel used as basis is considered
1388 # read-only, and no consistency checks are made and the make
1389 # system is not used on the basis kernel. If updates are required
1390 # in the basis kernel ordinary make commands (without M=...) must
1393 # The following are the only valid targets when building external
1395 # make M=dir clean Delete all automatically generated files
1396 # make M=dir modules Make all modules in specified dir
1397 # make M=dir Same as 'make M=dir modules'
1398 # make M=dir modules_install
1399 # Install the modules built in the module directory
1400 # Assumes install directory is already created
1402 # We are always building modules
1404 PHONY += crmodverdir
1408 PHONY += $(objtree)/Module.symvers
1409 $(objtree)/Module.symvers:
1410 @test -e $(objtree)/Module.symvers || ( \
1412 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1413 echo " is missing; modules will have no dependencies and modversions."; \
1416 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1417 PHONY += $(module-dirs) modules
1418 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1419 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1421 modules: $(module-dirs)
1422 @$(kecho) ' Building modules, stage 2.';
1423 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1425 PHONY += modules_install
1426 modules_install: _emodinst_ _emodinst_post
1428 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1431 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1432 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1434 PHONY += _emodinst_post
1435 _emodinst_post: _emodinst_
1438 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1440 PHONY += $(clean-dirs) clean
1442 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1444 clean: rm-dirs := $(MODVERDIR)
1445 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1448 @echo ' Building external modules.'
1449 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1451 @echo ' modules - default target, build the module(s)'
1452 @echo ' modules_install - install the module'
1453 @echo ' clean - remove generated files in module directory only'
1457 PHONY += prepare scripts
1460 endif # KBUILD_EXTMOD
1462 clean: $(clean-dirs)
1465 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1466 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1470 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1471 -o -name '*.symtypes' -o -name 'modules.order' \
1472 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1473 -o -name '*.gcno' \) -type f -print | xargs rm -f
1475 # Generate tags for editors
1476 # ---------------------------------------------------------------------------
1477 quiet_cmd_tags = GEN $@
1478 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1480 tags TAGS cscope gtags: FORCE
1483 # Scripts to check various things for consistency
1484 # ---------------------------------------------------------------------------
1486 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1489 find $(srctree)/* $(RCS_FIND_IGNORE) \
1490 -name '*.[hcS]' -type f -print | sort \
1491 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1494 find $(srctree)/* $(RCS_FIND_IGNORE) \
1495 -name '*.[hcS]' -type f -print | sort \
1496 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1499 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1502 $(PERL) $(srctree)/scripts/namespace.pl
1505 $(PERL) $(srctree)/scripts/export_report.pl
1507 endif #ifeq ($(config-targets),1)
1508 endif #ifeq ($(mixed-targets),1)
1510 PHONY += checkstack kernelrelease kernelversion image_name
1512 # UML needs a little special treatment here. It wants to use the host
1513 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1514 # else wants $(ARCH), including people doing cross-builds, which means
1515 # that $(SUBARCH) doesn't work here.
1517 CHECKSTACK_ARCH := $(SUBARCH)
1519 CHECKSTACK_ARCH := $(ARCH)
1522 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1523 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1526 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1529 @echo $(KERNELVERSION)
1532 @echo $(KBUILD_IMAGE)
1534 # Clear a bunch of variables before executing the submake
1536 $(Q)mkdir -p $(objtree)/tools
1537 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1540 $(Q)mkdir -p $(objtree)/tools
1541 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1544 # ---------------------------------------------------------------------------
1545 # Single targets are compatible with:
1546 # - build with mixed source and output
1547 # - build with separate output dir 'make O=...'
1548 # - external modules
1550 # target-dir => where to store outputfile
1551 # build-dir => directory in kernel source tree to use
1553 ifeq ($(KBUILD_EXTMOD),)
1554 build-dir = $(patsubst %/,%,$(dir $@))
1555 target-dir = $(dir $@)
1557 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1558 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1559 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1562 %.s: %.c prepare scripts FORCE
1563 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1564 %.i: %.c prepare scripts FORCE
1565 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1566 %.o: %.c prepare scripts FORCE
1567 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1568 %.lst: %.c prepare scripts FORCE
1569 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1570 %.s: %.S prepare scripts FORCE
1571 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1572 %.o: %.S prepare scripts FORCE
1573 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1574 %.symtypes: %.c prepare scripts FORCE
1575 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1578 /: prepare scripts FORCE
1580 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1581 $(build)=$(build-dir)
1582 # Make sure the latest headers are built for Documentation
1583 Documentation/: headers_install
1584 %/: prepare scripts FORCE
1586 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1587 $(build)=$(build-dir)
1588 %.ko: prepare scripts FORCE
1590 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1591 $(build)=$(build-dir) $(@:.ko=.o)
1592 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1594 # FIXME Should go into a make.lib or something
1595 # ===========================================================================
1597 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1598 cmd_rmdirs = rm -rf $(rm-dirs)
1600 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1601 cmd_rmfiles = rm -f $(rm-files)
1603 # Run depmod only if we have System.map and depmod is executable
1604 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1605 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1606 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1608 # Create temporary dir for module support files
1609 # clean it up only when building all modules
1610 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1611 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1613 # read all saved command lines
1615 targets := $(wildcard $(sort $(targets)))
1616 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1618 ifneq ($(cmd_files),)
1619 $(cmd_files): ; # Do not try to update included dependency files
1620 include $(cmd_files)
1623 endif # skip-makefile
1628 # Declare the contents of the .PHONY variable as phony. We keep that
1629 # information in a variable so we can use it in if_changed and friends.