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 ?= $(srctree)/../prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-
263 ifneq ($(wildcard $(srctree)/../prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9),)
264 CROSS_COMPILE ?= $(srctree)/../prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androidkernel-
267 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
269 # Architecture as present in compile.h
270 UTS_MACHINE := $(ARCH)
273 # Additional ARCH settings for x86
277 ifeq ($(ARCH),x86_64)
281 # Additional ARCH settings for sparc
282 ifeq ($(ARCH),sparc32)
285 ifeq ($(ARCH),sparc64)
289 # Additional ARCH settings for sh
294 # Additional ARCH settings for tile
295 ifeq ($(ARCH),tilepro)
298 ifeq ($(ARCH),tilegx)
302 # Where to locate arch specific headers
303 hdr-arch := $(SRCARCH)
305 KCONFIG_CONFIG ?= .config
306 export KCONFIG_CONFIG
308 # SHELL used by kbuild
309 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
310 else if [ -x /bin/bash ]; then echo /bin/bash; \
311 else echo sh; fi ; fi)
315 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
318 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
319 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
320 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
323 # Decide whether to build built-in, modular, or both.
324 # Normally, just do built-in.
329 # If we have only "make modules", don't compile built-in objects.
330 # When we're building modules with modversions, we need to consider
331 # the built-in objects during the descend as well, in order to
332 # make sure the checksums are up to date before we record them.
334 ifeq ($(MAKECMDGOALS),modules)
335 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
338 # If we have "make <whatever> modules", compile modules
339 # in addition to whatever we do anyway.
340 # Just "make" or "make all" shall build modules as well
342 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
346 ifeq ($(MAKECMDGOALS),)
350 export KBUILD_MODULES KBUILD_BUILTIN
351 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
353 # We need some generic definitions (do not try to remake the file).
354 scripts/Kbuild.include: ;
355 include scripts/Kbuild.include
357 # Make variables (CC, etc...)
358 AS = $(CROSS_COMPILE)as
359 LD = $(CROSS_COMPILE)ld
360 CC = $(CROSS_COMPILE)gcc
362 AR = $(CROSS_COMPILE)ar
363 NM = $(CROSS_COMPILE)nm
364 STRIP = $(CROSS_COMPILE)strip
365 OBJCOPY = $(CROSS_COMPILE)objcopy
366 OBJDUMP = $(CROSS_COMPILE)objdump
368 GENKSYMS = scripts/genksyms/genksyms
369 INSTALLKERNEL := installkernel
370 DEPMOD = /sbin/depmod
375 # Use the wrapper for the compiler. This wrapper scans for new
376 # warnings and causes the build to stop upon encountering them.
377 ifneq ($(wildcard $(srctree)/scripts/gcc-wrapper.py),)
378 CC = $(srctree)/scripts/gcc-wrapper.py $(CROSS_COMPILE)gcc
381 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
382 -Wbitwise -Wno-return-void $(CF)
388 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
391 # Use USERINCLUDE when you must reference the UAPI directories only.
393 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
394 -Iarch/$(hdr-arch)/include/generated/uapi \
395 -I$(srctree)/include/uapi \
396 -Iinclude/generated/uapi \
397 -include $(srctree)/include/linux/kconfig.h
399 # Use LINUXINCLUDE when you must reference the include/ directory.
400 # Needed to be compatible with the O= option
402 -I$(srctree)/arch/$(hdr-arch)/include \
403 -Iarch/$(hdr-arch)/include/generated/uapi \
404 -Iarch/$(hdr-arch)/include/generated \
405 $(if $(KBUILD_SRC), -I$(srctree)/include) \
409 KBUILD_CPPFLAGS := -D__KERNEL__
411 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
412 -fno-strict-aliasing -fno-common \
413 -Werror-implicit-function-declaration \
414 -Wno-format-security \
415 -std=gnu89 $(call cc-option,-fno-PIE)
418 KBUILD_AFLAGS_KERNEL :=
419 KBUILD_CFLAGS_KERNEL :=
420 KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
421 KBUILD_AFLAGS_MODULE := -DMODULE
422 KBUILD_CFLAGS_MODULE := -DMODULE
423 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
425 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
426 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
427 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
429 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
430 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
431 export CPP AR NM STRIP OBJCOPY OBJDUMP
432 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
433 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
435 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
436 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
437 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
438 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
439 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
440 export KBUILD_ARFLAGS
442 # When compiling out-of-tree modules, put MODVERDIR in the module
443 # tree rather than in the kernel tree. The kernel tree might
445 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
447 # Files to ignore in find ... statements
449 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
450 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
452 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
453 --exclude CVS --exclude .pc --exclude .hg --exclude .git
455 # ===========================================================================
456 # Rules shared between *config targets and build targets
458 # Basic helpers built in scripts/
459 PHONY += scripts_basic
461 $(Q)$(MAKE) $(build)=scripts/basic
462 $(Q)rm -f .tmp_quiet_recordmcount
464 # To avoid any implicit rule to kick in, define an empty command.
465 scripts/basic/%: scripts_basic ;
467 PHONY += outputmakefile
468 # outputmakefile generates a Makefile in the output directory, if using a
469 # separate output directory. This allows convenient use of make in the
472 ifneq ($(KBUILD_SRC),)
473 $(Q)ln -fsn $(srctree) source
474 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
475 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
478 # Support for using generic headers in asm-generic
481 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
482 src=asm obj=arch/$(SRCARCH)/include/generated/asm
483 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
484 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
486 # To make sure we do not include .config for any of the *config targets
487 # catch them early, and hand them over to scripts/kconfig/Makefile
488 # It is allowed to specify more targets when calling make, including
489 # mixing *config targets and build targets.
490 # For example 'make oldconfig all'.
491 # Detect when mixed targets is specified, and make a second invocation
492 # of make so .config is not included in this case either (for *config).
494 version_h := include/generated/uapi/linux/version.h
495 old_version_h := include/linux/version.h
497 no-dot-config-targets := clean mrproper distclean \
498 cscope gtags TAGS tags help% %docs check% coccicheck \
499 $(version_h) headers_% archheaders archscripts \
500 kernelversion %src-pkg
506 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
507 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
512 ifeq ($(KBUILD_EXTMOD),)
513 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
515 ifneq ($(words $(MAKECMDGOALS)),1)
520 # install and module_install need also be processed one by one
521 ifneq ($(filter install,$(MAKECMDGOALS)),)
522 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
527 ifeq ($(mixed-targets),1)
528 # ===========================================================================
529 # We're called with mixed targets (*config and build targets).
530 # Handle them one by one.
532 PHONY += $(MAKECMDGOALS) __build_one_by_one
534 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
539 for i in $(MAKECMDGOALS); do \
540 $(MAKE) -f $(srctree)/Makefile $$i; \
544 ifeq ($(config-targets),1)
545 # ===========================================================================
546 # *config targets only - make sure prerequisites are updated, and descend
547 # in scripts/kconfig to make the *config target
549 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
550 # KBUILD_DEFCONFIG may point out an alternative default configuration
551 # used for 'make defconfig'
552 include arch/$(SRCARCH)/Makefile
553 export KBUILD_DEFCONFIG KBUILD_KCONFIG
555 config: scripts_basic outputmakefile FORCE
556 $(Q)$(MAKE) $(build)=scripts/kconfig $@
558 %config: scripts_basic outputmakefile FORCE
559 $(Q)$(MAKE) $(build)=scripts/kconfig $@
562 # ===========================================================================
563 # Build targets only - this includes vmlinux, arch specific targets, clean
564 # targets and others. In general all targets except *config targets.
566 ifeq ($(KBUILD_EXTMOD),)
567 # Additional helpers built in scripts/
568 # Carefully list dependencies so we do not try to build scripts twice
571 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
573 $(Q)$(MAKE) $(build)=$(@)
575 # Objects we will link into vmlinux / subdirs we need to visit
577 drivers-y := drivers/ sound/ firmware/
582 endif # KBUILD_EXTMOD
584 ifeq ($(dot-config),1)
586 -include include/config/auto.conf
588 ifeq ($(KBUILD_EXTMOD),)
589 # Read in dependencies to all Kconfig* files, make sure to run
590 # oldconfig if changes are detected.
591 -include include/config/auto.conf.cmd
593 # To avoid any implicit rule to kick in, define an empty command
594 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
596 # If .config is newer than include/config/auto.conf, someone tinkered
597 # with it and forgot to run make oldconfig.
598 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
599 # we execute the config step to be sure to catch updated Kconfig files
600 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
601 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
603 # external modules needs include/generated/autoconf.h and include/config/auto.conf
604 # but do not care if they are up-to-date. Use auto.conf to trigger the test
605 PHONY += include/config/auto.conf
607 include/config/auto.conf:
608 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
610 echo >&2 " ERROR: Kernel configuration is invalid."; \
611 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
612 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
616 endif # KBUILD_EXTMOD
619 # Dummy target needed, because used as prerequisite
620 include/config/auto.conf: ;
621 endif # $(dot-config)
623 # The all: target is the default when no target is given on the
625 # This allow a user to issue only 'make' to build a kernel including modules
626 # Defaults to vmlinux, but the arch makefile usually adds further targets
629 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
630 # values of the respective KBUILD_* variables
634 include arch/$(SRCARCH)/Makefile
636 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
637 KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
638 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
640 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
643 ifdef CONFIG_PROFILE_ALL_BRANCHES
650 # Tell gcc to never replace conditional load with a non-conditional one
651 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
653 ifdef CONFIG_READABLE_ASM
654 # Disable optimizations that make assembler listings hard to read.
655 # reorder blocks reorders the control in the function
656 # ipa clone creates specialized cloned functions
657 # partial inlining inlines only parts of functions
658 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
659 $(call cc-option,-fno-ipa-cp-clone,) \
660 $(call cc-option,-fno-partial-inlining)
663 ifneq ($(CONFIG_FRAME_WARN),0)
664 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
667 # Handle stack protector mode.
669 # Since kbuild can potentially perform two passes (first with the old
670 # .config values and then with updated .config values), we cannot error out
671 # if a desired compiler option is unsupported. If we were to error, kbuild
672 # could never get to the second pass and actually notice that we changed
673 # the option to something that was supported.
675 # Additionally, we don't want to fallback and/or silently change which compiler
676 # flags will be used, since that leads to producing kernels with different
677 # security feature characteristics depending on the compiler used. ("But I
678 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
680 # The middle ground is to warn here so that the failed option is obvious, but
681 # to let the build fail with bad compiler flags so that we can't produce a
682 # kernel when there is a CONFIG and compiler mismatch.
684 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
685 stackp-flag := -fstack-protector
686 ifeq ($(call cc-option, $(stackp-flag)),)
687 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
688 -fstack-protector not supported by compiler)
691 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
692 stackp-flag := -fstack-protector-strong
693 ifeq ($(call cc-option, $(stackp-flag)),)
694 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
695 -fstack-protector-strong not supported by compiler)
698 # Force off for distro compilers that enable stack protector by default.
699 stackp-flag := $(call cc-option, -fno-stack-protector)
702 KBUILD_CFLAGS += $(stackp-flag)
704 ifeq ($(cc-name),clang)
705 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
706 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
707 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
708 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
709 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
710 # Quiet clang warning: comparison of unsigned expression < 0 is always false
711 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
712 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
713 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
714 # See modpost pattern 2
715 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
716 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
719 # These warnings generated too much noise in a regular build.
720 # Use make W=1 to enable them (see scripts/Makefile.build)
721 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
722 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
725 ifdef CONFIG_FRAME_POINTER
726 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
728 # Some targets (ARM with Thumb2, for example), can't be built with frame
729 # pointers. For those, we don't have FUNCTION_TRACER automatically
730 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
731 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
732 # -fomit-frame-pointer with FUNCTION_TRACER.
733 ifndef CONFIG_FUNCTION_TRACER
734 KBUILD_CFLAGS += -fomit-frame-pointer
738 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
740 ifdef CONFIG_DEBUG_INFO
741 ifdef CONFIG_DEBUG_INFO_SPLIT
742 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
746 KBUILD_AFLAGS += -Wa,-gdwarf-2
748 ifdef CONFIG_DEBUG_INFO_DWARF4
749 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
752 ifdef CONFIG_DEBUG_INFO_REDUCED
753 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
754 $(call cc-option,-fno-var-tracking)
757 ifdef CONFIG_FUNCTION_TRACER
758 ifndef CC_FLAGS_FTRACE
759 CC_FLAGS_FTRACE := -pg
761 export CC_FLAGS_FTRACE
762 ifdef CONFIG_HAVE_FENTRY
763 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
765 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
766 KBUILD_AFLAGS += $(CC_USING_FENTRY)
767 ifdef CONFIG_DYNAMIC_FTRACE
768 ifdef CONFIG_HAVE_C_RECORDMCOUNT
769 BUILD_C_RECORDMCOUNT := y
770 export BUILD_C_RECORDMCOUNT
775 # We trigger additional mismatches with less inlining
776 ifdef CONFIG_DEBUG_SECTION_MISMATCH
777 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
780 # arch Makefile may override CC so keep this after arch Makefile is included
781 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
782 CHECKFLAGS += $(NOSTDINC_FLAGS)
784 # warn about C99 declaration after statement
785 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
787 # disable pointer signed / unsigned warnings in gcc 4.0
788 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
790 # disable invalid "can't wrap" optimizations for signed / pointers
791 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
793 # conserve stack if available
794 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
796 # disallow errors like 'EXPORT_GPL(foo);' with missing header
797 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
799 # require functions to have arguments in prototypes, not empty 'int foo()'
800 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
802 # Prohibit date/time macros, which would make the build non-deterministic
803 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
805 # use the deterministic mode of AR if available
806 KBUILD_ARFLAGS := $(call ar-option,D)
808 # check for 'asm goto'
809 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
810 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
811 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
812 else ifneq ($(findstring aarch64-linux-android, $(CROSS_COMPILE)),)
813 # It seems than android gcc can't pass gcc-goto.sh check, but asm goto work.
814 # So let's active it.
815 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
816 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
819 include scripts/Makefile.kasan
820 include scripts/Makefile.extrawarn
822 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
824 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
825 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
826 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
828 # Use --build-id when available.
829 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
830 $(call cc-ldoption, -Wl$(comma)--build-id,))
831 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
832 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
834 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
835 LDFLAGS_vmlinux += $(call ld-option, -X,)
838 # Default kernel image to build when no specific target is given.
839 # KBUILD_IMAGE may be overruled on the command line or
840 # set in the environment
841 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
843 export KBUILD_IMAGE ?= vmlinux
846 # INSTALL_PATH specifies where to place the updated kernel and system map
847 # images. Default is /boot, but you can set it to other values
848 export INSTALL_PATH ?= /boot
851 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
852 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
853 # an argument if needed. Otherwise it defaults to the kernel install path
855 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
858 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
859 # relocations required by build roots. This is not defined in the
860 # makefile but the argument can be passed to make if needed.
863 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
867 # INSTALL_MOD_STRIP, if defined, will cause modules to be
868 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
869 # the default option --strip-debug will be used. Otherwise,
870 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
872 ifdef INSTALL_MOD_STRIP
873 ifeq ($(INSTALL_MOD_STRIP),1)
874 mod_strip_cmd = $(STRIP) --strip-debug
876 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
877 endif # INSTALL_MOD_STRIP=1
880 endif # INSTALL_MOD_STRIP
883 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
884 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
885 # or CONFIG_MODULE_COMPRESS_XZ.
887 mod_compress_cmd = true
888 ifdef CONFIG_MODULE_COMPRESS
889 ifdef CONFIG_MODULE_COMPRESS_GZIP
890 mod_compress_cmd = gzip -n -f
891 endif # CONFIG_MODULE_COMPRESS_GZIP
892 ifdef CONFIG_MODULE_COMPRESS_XZ
893 mod_compress_cmd = xz -f
894 endif # CONFIG_MODULE_COMPRESS_XZ
895 endif # CONFIG_MODULE_COMPRESS
896 export mod_compress_cmd
898 # Select initial ramdisk compression format, default is gzip(1).
899 # This shall be used by the dracut(8) tool while creating an initramfs image.
901 INITRD_COMPRESS-y := gzip
902 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
903 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
904 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
905 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
906 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
907 # do not export INITRD_COMPRESS, since we didn't actually
908 # choose a sane default compression above.
909 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
911 ifdef CONFIG_MODULE_SIG_ALL
912 $(eval $(call config_filename,MODULE_SIG_KEY))
914 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
921 ifeq ($(KBUILD_EXTMOD),)
922 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
924 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
925 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
926 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
928 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
929 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
931 init-y := $(patsubst %/, %/built-in.o, $(init-y))
932 core-y := $(patsubst %/, %/built-in.o, $(core-y))
933 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
934 net-y := $(patsubst %/, %/built-in.o, $(net-y))
935 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
936 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
937 libs-y := $(libs-y1) $(libs-y2)
938 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
940 # Externally visible symbols (used by link-vmlinux.sh)
941 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
942 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
943 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
944 export LDFLAGS_vmlinux
945 # used by scripts/pacmage/Makefile
946 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
948 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
950 # Final link of vmlinux
951 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
952 quiet_cmd_link-vmlinux = LINK $@
954 # Include targets which we want to
955 # execute if the rest of the kernel build went well.
956 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
957 ifdef CONFIG_HEADERS_CHECK
958 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
961 $(Q)$(MAKE) $(build)=samples
963 ifdef CONFIG_BUILD_DOCSRC
964 $(Q)$(MAKE) $(build)=Documentation
966 ifdef CONFIG_GDB_SCRIPTS
967 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
969 +$(call if_changed,link-vmlinux)
971 # The actual objects are generated when descending,
972 # make sure no implicit rule kicks in
973 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
975 # Handle descending into subdirectories listed in $(vmlinux-dirs)
976 # Preset locale variables to speed up the build process. Limit locale
977 # tweaks to this spot to avoid wrong language settings when running
978 # make menuconfig etc.
979 # Error messages still appears in the original language
981 PHONY += $(vmlinux-dirs)
982 $(vmlinux-dirs): prepare scripts
983 $(Q)$(MAKE) $(build)=$@
985 define filechk_kernel.release
986 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
989 # Store (new) KERNELRELEASE string in include/config/kernel.release
990 include/config/kernel.release: include/config/auto.conf FORCE
991 $(call filechk,kernel.release)
994 # Things we need to do before we recursively start building the kernel
995 # or the modules are listed in "prepare".
996 # A multi level approach is used. prepareN is processed before prepareN-1.
997 # archprepare is used in arch Makefiles and when processed asm symlink,
998 # version.h and scripts_basic is processed / created.
1000 # Listed in dependency order
1001 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1003 # prepare3 is used to check if we are building in a separate output directory,
1005 # 1) Check that make has not been executed in the kernel src $(srctree)
1006 prepare3: include/config/kernel.release
1007 ifneq ($(KBUILD_SRC),)
1008 @$(kecho) ' Using $(srctree) as source for kernel'
1009 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1010 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1011 echo >&2 " in the '$(srctree)' directory.";\
1016 # prepare2 creates a makefile if using a separate output directory
1017 prepare2: prepare3 outputmakefile asm-generic
1019 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1020 include/config/auto.conf
1023 archprepare: archheaders archscripts prepare1 scripts_basic
1025 prepare0: archprepare FORCE
1026 $(Q)$(MAKE) $(build)=.
1028 # All the preparing..
1031 # Generate some files
1032 # ---------------------------------------------------------------------------
1034 # KERNELRELEASE can change from a few different places, meaning version.h
1035 # needs to be updated, so this check is forced on all builds
1038 define filechk_utsrelease.h
1039 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1040 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1043 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1046 define filechk_version.h
1047 (echo \#define LINUX_VERSION_CODE $(shell \
1048 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1049 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1052 $(version_h): $(srctree)/Makefile FORCE
1053 $(call filechk,version.h)
1054 $(Q)rm -f $(old_version_h)
1056 include/generated/utsrelease.h: include/config/kernel.release FORCE
1057 $(call filechk,utsrelease.h)
1061 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1062 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1064 # ---------------------------------------------------------------------------
1066 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1067 export INSTALL_FW_PATH
1069 PHONY += firmware_install
1070 firmware_install: FORCE
1071 @mkdir -p $(objtree)/firmware
1072 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1074 # ---------------------------------------------------------------------------
1077 #Default location for installed headers
1078 export INSTALL_HDR_PATH = $(objtree)/usr
1080 # If we do an all arch process set dst to asm-$(hdr-arch)
1081 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1083 PHONY += archheaders
1086 PHONY += archscripts
1090 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1091 $(Q)$(MAKE) $(build)=scripts build_unifdef
1093 PHONY += headers_install_all
1094 headers_install_all:
1095 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1097 PHONY += headers_install
1098 headers_install: __headers
1099 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1100 $(error Headers not exportable for the $(SRCARCH) architecture))
1101 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1102 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1104 PHONY += headers_check_all
1105 headers_check_all: headers_install_all
1106 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1108 PHONY += headers_check
1109 headers_check: headers_install
1110 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1111 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1113 # ---------------------------------------------------------------------------
1118 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1121 $(Q)$(MAKE) -C tools/testing/selftests clean
1123 # ---------------------------------------------------------------------------
1126 ifdef CONFIG_MODULES
1128 # By default, build modules as well
1134 # A module can be listed more than once in obj-m resulting in
1135 # duplicate lines in modules.order files. Those are removed
1136 # using awk while concatenating to the final file.
1139 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1140 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1141 @$(kecho) ' Building modules, stage 2.';
1142 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1143 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1145 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1146 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1148 %/modules.builtin: include/config/auto.conf
1149 $(Q)$(MAKE) $(modbuiltin)=$*
1152 # Target to prepare building external modules
1153 PHONY += modules_prepare
1154 modules_prepare: prepare scripts
1156 # Target to install modules
1157 PHONY += modules_install
1158 modules_install: _modinst_ _modinst_post
1162 @rm -rf $(MODLIB)/kernel
1163 @rm -f $(MODLIB)/source
1164 @mkdir -p $(MODLIB)/kernel
1165 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1166 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1167 rm -f $(MODLIB)/build ; \
1168 ln -s $(CURDIR) $(MODLIB)/build ; \
1170 @cp -f $(objtree)/modules.order $(MODLIB)/
1171 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1172 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1174 # This depmod is only for convenience to give the initial
1175 # boot a modules.dep even before / is mounted read-write. However the
1176 # boot script depmod is the master version.
1177 PHONY += _modinst_post
1178 _modinst_post: _modinst_
1179 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1182 ifeq ($(CONFIG_MODULE_SIG), y)
1183 PHONY += modules_sign
1185 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1188 else # CONFIG_MODULES
1190 # Modules not configured
1191 # ---------------------------------------------------------------------------
1193 modules modules_install: FORCE
1195 @echo >&2 "The present kernel configuration has modules disabled."
1196 @echo >&2 "Type 'make config' and enable loadable module support."
1197 @echo >&2 "Then build a kernel with module support enabled."
1201 endif # CONFIG_MODULES
1204 # Cleaning is done on three levels.
1205 # make clean Delete most generated files
1206 # Leave enough to build external modules
1207 # make mrproper Delete the current configuration, and all generated files
1208 # make distclean Remove editor backup files, patch leftover files and the like
1210 # Directories & files removed with 'make clean'
1211 CLEAN_DIRS += $(MODVERDIR)
1213 # Directories & files removed with 'make mrproper'
1214 MRPROPER_DIRS += include/config usr/include include/generated \
1215 arch/*/include/generated .tmp_objdiff
1216 MRPROPER_FILES += .config .config.old .version .old_version \
1217 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1218 signing_key.pem signing_key.priv signing_key.x509 \
1219 x509.genkey extra_certificates signing_key.x509.keyid \
1220 signing_key.x509.signer vmlinux-gdb.py
1222 # clean - Delete most, but leave enough to build external modules
1224 clean: rm-dirs := $(CLEAN_DIRS)
1225 clean: rm-files := $(CLEAN_FILES)
1226 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1228 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1230 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1233 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1235 clean: archclean vmlinuxclean
1237 # mrproper - Delete all generated files, including .config
1239 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1240 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1241 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1243 PHONY += $(mrproper-dirs) mrproper archmrproper
1245 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1247 mrproper: clean archmrproper $(mrproper-dirs)
1256 @find $(srctree) $(RCS_FIND_IGNORE) \
1257 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1258 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1259 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1260 -type f -print | xargs rm -f
1263 # Packaging of the kernel to various formats
1264 # ---------------------------------------------------------------------------
1265 # rpm target kept for backward compatibility
1266 package-dir := scripts/package
1269 $(Q)$(MAKE) $(build)=$(package-dir) $@
1270 %pkg: include/config/kernel.release FORCE
1271 $(Q)$(MAKE) $(build)=$(package-dir) $@
1272 rpm: include/config/kernel.release FORCE
1273 $(Q)$(MAKE) $(build)=$(package-dir) $@
1276 # Brief documentation of the typical targets used
1277 # ---------------------------------------------------------------------------
1279 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1280 boards := $(sort $(notdir $(boards)))
1281 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1282 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1285 @echo 'Cleaning targets:'
1286 @echo ' clean - Remove most generated files but keep the config and'
1287 @echo ' enough build support to build external modules'
1288 @echo ' mrproper - Remove all generated files + config + various backup files'
1289 @echo ' distclean - mrproper + remove editor backup and patch files'
1291 @echo 'Configuration targets:'
1292 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1294 @echo 'Other generic targets:'
1295 @echo ' all - Build all targets marked with [*]'
1296 @echo '* vmlinux - Build the bare kernel'
1297 @echo '* modules - Build all modules'
1298 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1299 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1300 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1301 @echo ' dir/ - Build all files in dir and below'
1302 @echo ' dir/file.[ois] - Build specified target only'
1303 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1304 @echo ' (requires a recent binutils and recent build (System.map))'
1305 @echo ' dir/file.ko - Build module including final link'
1306 @echo ' modules_prepare - Set up for building external modules'
1307 @echo ' tags/TAGS - Generate tags file for editors'
1308 @echo ' cscope - Generate cscope index'
1309 @echo ' gtags - Generate GNU GLOBAL index'
1310 @echo ' kernelrelease - Output the release version string (use with make -s)'
1311 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1312 @echo ' image_name - Output the image name (use with make -s)'
1313 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1314 echo ' (default: $(INSTALL_HDR_PATH))'; \
1316 @echo 'Static analysers'
1317 @echo ' checkstack - Generate a list of stack hogs'
1318 @echo ' namespacecheck - Name space analysis on compiled kernel'
1319 @echo ' versioncheck - Sanity check on version.h usage'
1320 @echo ' includecheck - Check for duplicate included header files'
1321 @echo ' export_report - List the usages of all exported symbols'
1322 @echo ' headers_check - Sanity check on exported headers'
1323 @echo ' headerdep - Detect inclusion cycles in headers'
1324 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1326 @echo 'Kernel selftest'
1327 @echo ' kselftest - Build and run kernel selftest (run as root)'
1328 @echo ' Build, install, and boot kernel before'
1329 @echo ' running kselftest on it'
1330 @echo ' kselftest-clean - Remove all generated kselftest files'
1332 @echo 'Kernel packaging:'
1333 @$(MAKE) $(build)=$(package-dir) help
1335 @echo 'Documentation targets:'
1336 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1338 @echo 'Architecture specific targets ($(SRCARCH)):'
1339 @$(if $(archhelp),$(archhelp),\
1340 echo ' No architecture specific help defined for $(SRCARCH)')
1343 $(foreach b, $(boards), \
1344 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1346 @$(if $(board-dirs), \
1347 $(foreach b, $(board-dirs), \
1348 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1349 printf " %-16s - Show all of the above\\n" help-boards; \
1352 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1353 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1354 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1355 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1356 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1357 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1358 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1359 @echo ' 1: warnings which may be relevant and do not occur too often'
1360 @echo ' 2: warnings which occur quite often but may still be relevant'
1361 @echo ' 3: more obscure warnings, can most likely be ignored'
1362 @echo ' Multiple levels can be combined with W=12 or W=123'
1364 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1365 @echo 'For further info see the ./README file'
1368 help-board-dirs := $(addprefix help-,$(board-dirs))
1370 help-boards: $(help-board-dirs)
1372 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1374 $(help-board-dirs): help-%:
1375 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1376 @$(if $(boards-per-dir), \
1377 $(foreach b, $(boards-per-dir), \
1378 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1382 # Documentation targets
1383 # ---------------------------------------------------------------------------
1384 %docs: scripts_basic FORCE
1385 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1386 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1388 else # KBUILD_EXTMOD
1391 # External module support.
1392 # When building external modules the kernel used as basis is considered
1393 # read-only, and no consistency checks are made and the make
1394 # system is not used on the basis kernel. If updates are required
1395 # in the basis kernel ordinary make commands (without M=...) must
1398 # The following are the only valid targets when building external
1400 # make M=dir clean Delete all automatically generated files
1401 # make M=dir modules Make all modules in specified dir
1402 # make M=dir Same as 'make M=dir modules'
1403 # make M=dir modules_install
1404 # Install the modules built in the module directory
1405 # Assumes install directory is already created
1407 # We are always building modules
1409 PHONY += crmodverdir
1413 PHONY += $(objtree)/Module.symvers
1414 $(objtree)/Module.symvers:
1415 @test -e $(objtree)/Module.symvers || ( \
1417 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1418 echo " is missing; modules will have no dependencies and modversions."; \
1421 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1422 PHONY += $(module-dirs) modules
1423 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1424 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1426 modules: $(module-dirs)
1427 @$(kecho) ' Building modules, stage 2.';
1428 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1430 PHONY += modules_install
1431 modules_install: _emodinst_ _emodinst_post
1433 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1436 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1437 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1439 PHONY += _emodinst_post
1440 _emodinst_post: _emodinst_
1443 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1445 PHONY += $(clean-dirs) clean
1447 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1449 clean: rm-dirs := $(MODVERDIR)
1450 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1453 @echo ' Building external modules.'
1454 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1456 @echo ' modules - default target, build the module(s)'
1457 @echo ' modules_install - install the module'
1458 @echo ' clean - remove generated files in module directory only'
1462 PHONY += prepare scripts
1465 endif # KBUILD_EXTMOD
1467 clean: $(clean-dirs)
1470 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1471 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1475 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1476 -o -name '*.symtypes' -o -name 'modules.order' \
1477 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1478 -o -name '*.gcno' \) -type f -print | xargs rm -f
1480 # Generate tags for editors
1481 # ---------------------------------------------------------------------------
1482 quiet_cmd_tags = GEN $@
1483 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1485 tags TAGS cscope gtags: FORCE
1488 # Scripts to check various things for consistency
1489 # ---------------------------------------------------------------------------
1491 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1494 find $(srctree)/* $(RCS_FIND_IGNORE) \
1495 -name '*.[hcS]' -type f -print | sort \
1496 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1499 find $(srctree)/* $(RCS_FIND_IGNORE) \
1500 -name '*.[hcS]' -type f -print | sort \
1501 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1504 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1507 $(PERL) $(srctree)/scripts/namespace.pl
1510 $(PERL) $(srctree)/scripts/export_report.pl
1512 endif #ifeq ($(config-targets),1)
1513 endif #ifeq ($(mixed-targets),1)
1515 PHONY += checkstack kernelrelease kernelversion image_name
1517 # UML needs a little special treatment here. It wants to use the host
1518 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1519 # else wants $(ARCH), including people doing cross-builds, which means
1520 # that $(SUBARCH) doesn't work here.
1522 CHECKSTACK_ARCH := $(SUBARCH)
1524 CHECKSTACK_ARCH := $(ARCH)
1527 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1528 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1531 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1534 @echo $(KERNELVERSION)
1537 @echo $(KBUILD_IMAGE)
1539 # Clear a bunch of variables before executing the submake
1541 $(Q)mkdir -p $(objtree)/tools
1542 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1545 $(Q)mkdir -p $(objtree)/tools
1546 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1549 # ---------------------------------------------------------------------------
1550 # Single targets are compatible with:
1551 # - build with mixed source and output
1552 # - build with separate output dir 'make O=...'
1553 # - external modules
1555 # target-dir => where to store outputfile
1556 # build-dir => directory in kernel source tree to use
1558 ifeq ($(KBUILD_EXTMOD),)
1559 build-dir = $(patsubst %/,%,$(dir $@))
1560 target-dir = $(dir $@)
1562 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1563 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1564 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1567 %.s: %.c prepare scripts FORCE
1568 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1569 %.i: %.c prepare scripts FORCE
1570 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1571 %.o: %.c prepare scripts FORCE
1572 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1573 %.lst: %.c prepare scripts FORCE
1574 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1575 %.s: %.S prepare scripts FORCE
1576 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1577 %.o: %.S prepare scripts FORCE
1578 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1579 %.symtypes: %.c prepare scripts FORCE
1580 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1583 /: prepare scripts FORCE
1585 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1586 $(build)=$(build-dir)
1587 # Make sure the latest headers are built for Documentation
1588 Documentation/: headers_install
1589 %/: prepare scripts FORCE
1591 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1592 $(build)=$(build-dir)
1593 %.ko: prepare scripts FORCE
1595 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1596 $(build)=$(build-dir) $(@:.ko=.o)
1597 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1599 # FIXME Should go into a make.lib or something
1600 # ===========================================================================
1602 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1603 cmd_rmdirs = rm -rf $(rm-dirs)
1605 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1606 cmd_rmfiles = rm -f $(rm-files)
1608 # Run depmod only if we have System.map and depmod is executable
1609 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1610 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1611 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1613 # Create temporary dir for module support files
1614 # clean it up only when building all modules
1615 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1616 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1618 # read all saved command lines
1620 targets := $(wildcard $(sort $(targets)))
1621 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1623 ifneq ($(cmd_files),)
1624 $(cmd_files): ; # Do not try to update included dependency files
1625 include $(cmd_files)
1628 endif # skip-makefile
1633 # Declare the contents of the .PHONY variable as phony. We keep that
1634 # information in a variable so we can use it in if_changed and friends.