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))),)
93 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
99 export quiet Q KBUILD_VERBOSE
101 # kbuild supports saving output files in a separate directory.
102 # To locate output files in a separate directory two syntaxes are supported.
103 # In both cases the working directory must be the root of the kernel src.
105 # Use "make O=dir/to/store/output/files/"
107 # 2) Set KBUILD_OUTPUT
108 # Set the environment variable KBUILD_OUTPUT to point to the directory
109 # where the output files shall be placed.
110 # export KBUILD_OUTPUT=dir/to/store/output/files/
113 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
116 # KBUILD_SRC is set on invocation of make in OBJ directory
117 # KBUILD_SRC is not intended to be used by the regular user (for now)
118 ifeq ($(KBUILD_SRC),)
120 # OK, Make called in directory where kernel src resides
121 # Do we want to locate output files in a separate directory?
122 ifeq ("$(origin O)", "command line")
123 KBUILD_OUTPUT := $(O)
126 # That's our default target when none is given on the command line
130 # Cancel implicit rules on top Makefile
131 $(CURDIR)/Makefile Makefile: ;
133 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
134 $(error main directory cannot contain spaces nor colons)
137 ifneq ($(KBUILD_OUTPUT),)
138 # Invoke a second make in the output directory, passing relevant variables
139 # check that the output directory actually exists
140 saved-output := $(KBUILD_OUTPUT)
141 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
143 $(if $(KBUILD_OUTPUT),, \
144 $(error failed to create output directory "$(saved-output)"))
146 PHONY += $(MAKECMDGOALS) sub-make
148 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
152 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
153 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
155 # Leave processing to above invocation of make
157 endif # ifneq ($(KBUILD_OUTPUT),)
158 endif # ifeq ($(KBUILD_SRC),)
160 # We process the rest of the Makefile if this is the final invocation of make
161 ifeq ($(skip-makefile),)
163 # Do not print "Entering directory ...",
164 # but we want to display it when entering to the output directory
165 # so that IDEs/editors are able to understand relative filenames.
166 MAKEFLAGS += --no-print-directory
168 # Call a source code checker (by default, "sparse") as part of the
171 # Use 'make C=1' to enable checking of only re-compiled files.
172 # Use 'make C=2' to enable checking of *all* source files, regardless
173 # of whether they are re-compiled or not.
175 # See the file "Documentation/sparse.txt" for more details, including
176 # where to get the "sparse" utility.
178 ifeq ("$(origin C)", "command line")
179 KBUILD_CHECKSRC = $(C)
181 ifndef KBUILD_CHECKSRC
185 # Use make M=dir to specify directory of external module to build
186 # Old syntax make ... SUBDIRS=$PWD is still supported
187 # Setting the environment variable KBUILD_EXTMOD take precedence
189 KBUILD_EXTMOD ?= $(SUBDIRS)
192 ifeq ("$(origin M)", "command line")
193 KBUILD_EXTMOD := $(M)
196 # If building an external module we do not care about the all: rule
197 # but instead _all depend on modules
199 ifeq ($(KBUILD_EXTMOD),)
205 ifeq ($(KBUILD_SRC),)
206 # building in the source tree
209 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
210 # building in a subdirectory of the source tree
213 srctree := $(KBUILD_SRC)
220 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
222 export srctree objtree VPATH
224 # SUBARCH tells the usermode build what the underlying arch is. That is set
225 # first, and if a usermode build is happening, the "ARCH=um" on the command
226 # line overrides the setting of ARCH below. If a native build is happening,
227 # then ARCH is assigned, getting whatever value it gets normally, and
228 # SUBARCH is subsequently ignored.
230 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
231 -e s/sun4u/sparc64/ \
232 -e s/arm.*/arm/ -e s/sa110/arm/ \
233 -e s/s390x/s390/ -e s/parisc64/parisc/ \
234 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
235 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
237 # Cross compiling and selecting different set of gcc/bin-utils
238 # ---------------------------------------------------------------------------
240 # When performing cross compilation for other architectures ARCH shall be set
241 # to the target architecture. (See arch/* for the possibilities).
242 # ARCH can be set during invocation of make:
244 # Another way is to have ARCH set in the environment.
245 # The default ARCH is the host where make is executed.
247 # CROSS_COMPILE specify the prefix used for all executables used
248 # during compilation. Only gcc and related bin-utils executables
249 # are prefixed with $(CROSS_COMPILE).
250 # CROSS_COMPILE can be set on the command line
251 # make CROSS_COMPILE=ia64-linux-
252 # Alternatively CROSS_COMPILE can be set in the environment.
253 # A third alternative is to store a setting in .config so that plain
254 # "make" in the configured kernel build directory always uses that.
255 # Default value for CROSS_COMPILE is not to prefix executables
256 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
258 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
260 # Architecture as present in compile.h
261 UTS_MACHINE := $(ARCH)
264 # Additional ARCH settings for x86
268 ifeq ($(ARCH),x86_64)
272 # Additional ARCH settings for sparc
273 ifeq ($(ARCH),sparc32)
276 ifeq ($(ARCH),sparc64)
280 # Additional ARCH settings for sh
285 # Additional ARCH settings for tile
286 ifeq ($(ARCH),tilepro)
289 ifeq ($(ARCH),tilegx)
293 # Where to locate arch specific headers
294 hdr-arch := $(SRCARCH)
296 KCONFIG_CONFIG ?= .config
297 export KCONFIG_CONFIG
299 # SHELL used by kbuild
300 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
301 else if [ -x /bin/bash ]; then echo /bin/bash; \
302 else echo sh; fi ; fi)
306 HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
309 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
310 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
311 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
314 # Decide whether to build built-in, modular, or both.
315 # Normally, just do built-in.
320 # If we have only "make modules", don't compile built-in objects.
321 # When we're building modules with modversions, we need to consider
322 # the built-in objects during the descend as well, in order to
323 # make sure the checksums are up to date before we record them.
325 ifeq ($(MAKECMDGOALS),modules)
326 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
329 # If we have "make <whatever> modules", compile modules
330 # in addition to whatever we do anyway.
331 # Just "make" or "make all" shall build modules as well
333 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
337 ifeq ($(MAKECMDGOALS),)
341 export KBUILD_MODULES KBUILD_BUILTIN
342 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
344 # We need some generic definitions (do not try to remake the file).
345 scripts/Kbuild.include: ;
346 include scripts/Kbuild.include
348 # Make variables (CC, etc...)
349 AS = $(CROSS_COMPILE)as
350 LD = $(CROSS_COMPILE)ld
351 REAL_CC = $(CROSS_COMPILE)gcc
353 AR = $(CROSS_COMPILE)ar
354 NM = $(CROSS_COMPILE)nm
355 STRIP = $(CROSS_COMPILE)strip
356 OBJCOPY = $(CROSS_COMPILE)objcopy
357 OBJDUMP = $(CROSS_COMPILE)objdump
359 GENKSYMS = scripts/genksyms/genksyms
360 INSTALLKERNEL := installkernel
361 DEPMOD = /sbin/depmod
366 # Use the wrapper for the compiler. This wrapper scans for new
367 # warnings and causes the build to stop upon encountering them.
368 CC = $(srctree)/scripts/gcc-wrapper.py $(REAL_CC)
370 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
371 -Wbitwise -Wno-return-void $(CF)
377 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
378 CFLAGS_KCOV = -fsanitize-coverage=trace-pc
381 # Use USERINCLUDE when you must reference the UAPI directories only.
383 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
384 -Iarch/$(hdr-arch)/include/generated/uapi \
385 -I$(srctree)/include/uapi \
386 -Iinclude/generated/uapi \
387 -include $(srctree)/include/linux/kconfig.h
389 # Use LINUXINCLUDE when you must reference the include/ directory.
390 # Needed to be compatible with the O= option
392 -I$(srctree)/arch/$(hdr-arch)/include \
393 -Iarch/$(hdr-arch)/include/generated/uapi \
394 -Iarch/$(hdr-arch)/include/generated \
395 $(if $(KBUILD_SRC), -I$(srctree)/include) \
399 KBUILD_CPPFLAGS := -D__KERNEL__
401 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
402 -fno-strict-aliasing -fno-common \
403 -Werror-implicit-function-declaration \
404 -Wno-format-security \
405 -std=gnu89 $(call cc-option,-fno-PIE)
407 ifeq ($(TARGET_BOARD_TYPE),auto)
408 KBUILD_CFLAGS += -DCONFIG_PLATFORM_AUTO
410 KBUILD_AFLAGS_KERNEL :=
411 KBUILD_CFLAGS_KERNEL :=
412 KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
413 KBUILD_AFLAGS_MODULE := -DMODULE
414 KBUILD_CFLAGS_MODULE := -DMODULE
415 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
417 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
418 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
419 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
421 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
422 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
423 export CPP AR NM STRIP OBJCOPY OBJDUMP
424 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
425 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
427 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
428 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
429 export CFLAGS_KASAN CFLAGS_UBSAN CFLAGS_KASAN_NOSANITIZE
431 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
432 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
433 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
434 export KBUILD_ARFLAGS
436 # When compiling out-of-tree modules, put MODVERDIR in the module
437 # tree rather than in the kernel tree. The kernel tree might
439 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
441 # Files to ignore in find ... statements
443 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
444 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
446 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
447 --exclude CVS --exclude .pc --exclude .hg --exclude .git
449 # ===========================================================================
450 # Rules shared between *config targets and build targets
452 # Basic helpers built in scripts/
453 PHONY += scripts_basic
455 $(Q)$(MAKE) $(build)=scripts/basic
456 $(Q)rm -f .tmp_quiet_recordmcount
458 # To avoid any implicit rule to kick in, define an empty command.
459 scripts/basic/%: scripts_basic ;
461 PHONY += outputmakefile
462 # outputmakefile generates a Makefile in the output directory, if using a
463 # separate output directory. This allows convenient use of make in the
466 ifneq ($(KBUILD_SRC),)
467 $(Q)ln -fsn $(srctree) source
468 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
469 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
472 # Support for using generic headers in asm-generic
475 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
476 src=asm obj=arch/$(SRCARCH)/include/generated/asm
477 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
478 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
480 # To make sure we do not include .config for any of the *config targets
481 # catch them early, and hand them over to scripts/kconfig/Makefile
482 # It is allowed to specify more targets when calling make, including
483 # mixing *config targets and build targets.
484 # For example 'make oldconfig all'.
485 # Detect when mixed targets is specified, and make a second invocation
486 # of make so .config is not included in this case either (for *config).
488 version_h := include/generated/uapi/linux/version.h
489 old_version_h := include/linux/version.h
491 no-dot-config-targets := clean mrproper distclean \
492 cscope gtags TAGS tags help% %docs check% coccicheck \
493 $(version_h) headers_% archheaders archscripts \
494 kernelversion %src-pkg
500 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
501 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
506 ifeq ($(KBUILD_EXTMOD),)
507 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
509 ifneq ($(words $(MAKECMDGOALS)),1)
514 # install and module_install need also be processed one by one
515 ifneq ($(filter install,$(MAKECMDGOALS)),)
516 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
521 ifeq ($(mixed-targets),1)
522 # ===========================================================================
523 # We're called with mixed targets (*config and build targets).
524 # Handle them one by one.
526 PHONY += $(MAKECMDGOALS) __build_one_by_one
528 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
533 for i in $(MAKECMDGOALS); do \
534 $(MAKE) -f $(srctree)/Makefile $$i; \
538 ifeq ($(config-targets),1)
539 # ===========================================================================
540 # *config targets only - make sure prerequisites are updated, and descend
541 # in scripts/kconfig to make the *config target
543 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
544 # KBUILD_DEFCONFIG may point out an alternative default configuration
545 # used for 'make defconfig'
546 include arch/$(SRCARCH)/Makefile
547 export KBUILD_DEFCONFIG KBUILD_KCONFIG
549 config: scripts_basic outputmakefile FORCE
550 $(Q)$(MAKE) $(build)=scripts/kconfig $@
552 %config: scripts_basic outputmakefile FORCE
553 $(Q)$(MAKE) $(build)=scripts/kconfig $@
556 # ===========================================================================
557 # Build targets only - this includes vmlinux, arch specific targets, clean
558 # targets and others. In general all targets except *config targets.
560 ifeq ($(KBUILD_EXTMOD),)
561 # Additional helpers built in scripts/
562 # Carefully list dependencies so we do not try to build scripts twice
565 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
567 $(Q)$(MAKE) $(build)=$(@)
569 # Objects we will link into vmlinux / subdirs we need to visit
571 drivers-y := drivers/ sound/ firmware/
576 endif # KBUILD_EXTMOD
578 ifeq ($(dot-config),1)
580 -include include/config/auto.conf
582 ifeq ($(KBUILD_EXTMOD),)
583 # Read in dependencies to all Kconfig* files, make sure to run
584 # oldconfig if changes are detected.
585 -include include/config/auto.conf.cmd
587 # To avoid any implicit rule to kick in, define an empty command
588 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
590 # If .config is newer than include/config/auto.conf, someone tinkered
591 # with it and forgot to run make oldconfig.
592 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
593 # we execute the config step to be sure to catch updated Kconfig files
594 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
595 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
597 # external modules needs include/generated/autoconf.h and include/config/auto.conf
598 # but do not care if they are up-to-date. Use auto.conf to trigger the test
599 PHONY += include/config/auto.conf
601 include/config/auto.conf:
602 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
604 echo >&2 " ERROR: Kernel configuration is invalid."; \
605 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
606 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
610 endif # KBUILD_EXTMOD
613 # Dummy target needed, because used as prerequisite
614 include/config/auto.conf: ;
615 endif # $(dot-config)
617 # The all: target is the default when no target is given on the
619 # This allow a user to issue only 'make' to build a kernel including modules
620 # Defaults to vmlinux, but the arch makefile usually adds further targets
623 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
624 # values of the respective KBUILD_* variables
628 include arch/$(SRCARCH)/Makefile
630 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
631 KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
632 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
633 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
634 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
635 KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
636 KBUILD_CFLAGS += $(call cc-disable-warning, attribute-alias)
638 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
639 KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
641 ifdef CONFIG_PROFILE_ALL_BRANCHES
648 # Tell gcc to never replace conditional load with a non-conditional one
649 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
651 # check for 'asm goto'
652 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
653 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
654 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
657 ifdef CONFIG_READABLE_ASM
658 # Disable optimizations that make assembler listings hard to read.
659 # reorder blocks reorders the control in the function
660 # ipa clone creates specialized cloned functions
661 # partial inlining inlines only parts of functions
662 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
663 $(call cc-option,-fno-ipa-cp-clone,) \
664 $(call cc-option,-fno-partial-inlining)
667 ifneq ($(CONFIG_FRAME_WARN),0)
668 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
671 # Handle stack protector mode.
673 # Since kbuild can potentially perform two passes (first with the old
674 # .config values and then with updated .config values), we cannot error out
675 # if a desired compiler option is unsupported. If we were to error, kbuild
676 # could never get to the second pass and actually notice that we changed
677 # the option to something that was supported.
679 # Additionally, we don't want to fallback and/or silently change which compiler
680 # flags will be used, since that leads to producing kernels with different
681 # security feature characteristics depending on the compiler used. ("But I
682 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
684 # The middle ground is to warn here so that the failed option is obvious, but
685 # to let the build fail with bad compiler flags so that we can't produce a
686 # kernel when there is a CONFIG and compiler mismatch.
688 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
689 stackp-flag := -fstack-protector
690 ifeq ($(call cc-option, $(stackp-flag)),)
691 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
692 -fstack-protector not supported by compiler)
695 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
696 stackp-flag := -fstack-protector-strong
697 ifeq ($(call cc-option, $(stackp-flag)),)
698 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
699 -fstack-protector-strong not supported by compiler)
702 # Force off for distro compilers that enable stack protector by default.
703 stackp-flag := $(call cc-option, -fno-stack-protector)
706 KBUILD_CFLAGS += $(stackp-flag)
709 ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
710 $(warning Cannot use CONFIG_KCOV: \
711 -fsanitize-coverage=trace-pc is not supported by compiler)
716 ifeq ($(cc-name),clang)
717 ifneq ($(CROSS_COMPILE),)
718 CLANG_TRIPLE ?= $(CROSS_COMPILE)
719 CLANG_TARGET := --target=$(notdir $(CLANG_TRIPLE:%-=%))
720 GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
722 ifneq ($(GCC_TOOLCHAIN),)
723 CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
725 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
726 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
727 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
728 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
729 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
730 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
731 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
732 KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
733 # Quiet clang warning: comparison of unsigned expression < 0 is always false
734 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
735 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
736 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
737 # See modpost pattern 2
738 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
739 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
740 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
741 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
744 # These warnings generated too much noise in a regular build.
745 # Use make W=1 to enable them (see scripts/Makefile.build)
746 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
747 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
750 ifdef CONFIG_FRAME_POINTER
751 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
753 # Some targets (ARM with Thumb2, for example), can't be built with frame
754 # pointers. For those, we don't have FUNCTION_TRACER automatically
755 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
756 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
757 # -fomit-frame-pointer with FUNCTION_TRACER.
758 ifndef CONFIG_FUNCTION_TRACER
759 KBUILD_CFLAGS += -fomit-frame-pointer
763 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
765 ifdef CONFIG_DEBUG_INFO
766 ifdef CONFIG_DEBUG_INFO_SPLIT
767 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
771 KBUILD_AFLAGS += -Wa,-gdwarf-2
773 ifdef CONFIG_DEBUG_INFO_DWARF4
774 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
777 ifdef CONFIG_DEBUG_INFO_REDUCED
778 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
779 $(call cc-option,-fno-var-tracking)
782 ifdef CONFIG_FUNCTION_TRACER
783 ifndef CC_FLAGS_FTRACE
784 CC_FLAGS_FTRACE := -pg
786 export CC_FLAGS_FTRACE
787 ifdef CONFIG_HAVE_FENTRY
788 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
790 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
791 KBUILD_AFLAGS += $(CC_USING_FENTRY)
792 ifdef CONFIG_DYNAMIC_FTRACE
793 ifdef CONFIG_HAVE_C_RECORDMCOUNT
794 BUILD_C_RECORDMCOUNT := y
795 export BUILD_C_RECORDMCOUNT
800 # We trigger additional mismatches with less inlining
801 ifdef CONFIG_DEBUG_SECTION_MISMATCH
802 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
805 # arch Makefile may override CC so keep this after arch Makefile is included
806 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
807 CHECKFLAGS += $(NOSTDINC_FLAGS)
809 # warn about C99 declaration after statement
810 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
812 # disable pointer signed / unsigned warnings in gcc 4.0
813 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
815 # disable invalid "can't wrap" optimizations for signed / pointers
816 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
818 # clang sets -fmerge-all-constants by default as optimization, but this
819 # is non-conforming behavior for C and in fact breaks the kernel, so we
820 # need to disable it here generally.
821 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
823 # for gcc -fno-merge-all-constants disables everything, but it is fine
824 # to have actual conforming behavior enabled.
825 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
827 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
828 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
830 # conserve stack if available
831 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
833 # disallow errors like 'EXPORT_GPL(foo);' with missing header
834 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
836 # require functions to have arguments in prototypes, not empty 'int foo()'
837 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
839 # Prohibit date/time macros, which would make the build non-deterministic
840 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
842 # use the deterministic mode of AR if available
843 KBUILD_ARFLAGS := $(call ar-option,D)
845 include scripts/Makefile.kasan
846 include scripts/Makefile.extrawarn
847 include scripts/Makefile.ubsan
849 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
851 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
852 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
853 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
855 # Use --build-id when available.
856 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
857 $(call cc-ldoption, -Wl$(comma)--build-id,))
858 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
859 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
861 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
862 LDFLAGS_vmlinux += $(call ld-option, -X,)
865 # Default kernel image to build when no specific target is given.
866 # KBUILD_IMAGE may be overruled on the command line or
867 # set in the environment
868 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
870 export KBUILD_IMAGE ?= vmlinux
873 # INSTALL_PATH specifies where to place the updated kernel and system map
874 # images. Default is /boot, but you can set it to other values
875 export INSTALL_PATH ?= /boot
878 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
879 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
880 # an argument if needed. Otherwise it defaults to the kernel install path
882 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
885 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
886 # relocations required by build roots. This is not defined in the
887 # makefile but the argument can be passed to make if needed.
890 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
894 # INSTALL_MOD_STRIP, if defined, will cause modules to be
895 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
896 # the default option --strip-debug will be used. Otherwise,
897 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
899 ifdef INSTALL_MOD_STRIP
900 ifeq ($(INSTALL_MOD_STRIP),1)
901 mod_strip_cmd = $(STRIP) --strip-debug
903 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
904 endif # INSTALL_MOD_STRIP=1
907 endif # INSTALL_MOD_STRIP
910 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
911 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
912 # or CONFIG_MODULE_COMPRESS_XZ.
914 mod_compress_cmd = true
915 ifdef CONFIG_MODULE_COMPRESS
916 ifdef CONFIG_MODULE_COMPRESS_GZIP
917 mod_compress_cmd = gzip -n -f
918 endif # CONFIG_MODULE_COMPRESS_GZIP
919 ifdef CONFIG_MODULE_COMPRESS_XZ
920 mod_compress_cmd = xz -f
921 endif # CONFIG_MODULE_COMPRESS_XZ
922 endif # CONFIG_MODULE_COMPRESS
923 export mod_compress_cmd
925 # Select initial ramdisk compression format, default is gzip(1).
926 # This shall be used by the dracut(8) tool while creating an initramfs image.
928 INITRD_COMPRESS-y := gzip
929 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
930 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
931 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
932 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
933 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
934 # do not export INITRD_COMPRESS, since we didn't actually
935 # choose a sane default compression above.
936 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
938 ifdef CONFIG_MODULE_SIG_ALL
939 $(eval $(call config_filename,MODULE_SIG_KEY))
941 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
948 ifeq ($(KBUILD_EXTMOD),)
949 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
951 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
952 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
953 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
955 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
956 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
958 init-y := $(patsubst %/, %/built-in.o, $(init-y))
959 core-y := $(patsubst %/, %/built-in.o, $(core-y))
960 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
961 net-y := $(patsubst %/, %/built-in.o, $(net-y))
962 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
963 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
964 libs-y := $(libs-y1) $(libs-y2)
965 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
967 # Externally visible symbols (used by link-vmlinux.sh)
968 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
969 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
970 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
971 export LDFLAGS_vmlinux
972 # used by scripts/pacmage/Makefile
973 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
975 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
977 # Final link of vmlinux
978 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
979 quiet_cmd_link-vmlinux = LINK $@
981 # Include targets which we want to
982 # execute if the rest of the kernel build went well.
983 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
984 ifdef CONFIG_HEADERS_CHECK
985 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
988 $(Q)$(MAKE) $(build)=samples
990 ifdef CONFIG_BUILD_DOCSRC
991 $(Q)$(MAKE) $(build)=Documentation
993 ifdef CONFIG_GDB_SCRIPTS
994 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
996 +$(call if_changed,link-vmlinux)
998 # The actual objects are generated when descending,
999 # make sure no implicit rule kicks in
1000 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1002 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1003 # Preset locale variables to speed up the build process. Limit locale
1004 # tweaks to this spot to avoid wrong language settings when running
1005 # make menuconfig etc.
1006 # Error messages still appears in the original language
1008 PHONY += $(vmlinux-dirs)
1009 $(vmlinux-dirs): prepare scripts
1010 $(Q)$(MAKE) $(build)=$@
1012 define filechk_kernel.release
1013 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1016 # Store (new) KERNELRELEASE string in include/config/kernel.release
1017 include/config/kernel.release: include/config/auto.conf FORCE
1018 $(call filechk,kernel.release)
1021 # Things we need to do before we recursively start building the kernel
1022 # or the modules are listed in "prepare".
1023 # A multi level approach is used. prepareN is processed before prepareN-1.
1024 # archprepare is used in arch Makefiles and when processed asm symlink,
1025 # version.h and scripts_basic is processed / created.
1027 # Listed in dependency order
1028 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1030 # prepare3 is used to check if we are building in a separate output directory,
1032 # 1) Check that make has not been executed in the kernel src $(srctree)
1033 prepare3: include/config/kernel.release
1034 ifneq ($(KBUILD_SRC),)
1035 @$(kecho) ' Using $(srctree) as source for kernel'
1036 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1037 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1038 echo >&2 " in the '$(srctree)' directory.";\
1043 # prepare2 creates a makefile if using a separate output directory
1044 prepare2: prepare3 outputmakefile asm-generic
1046 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1047 include/config/auto.conf
1050 archprepare: archheaders archscripts prepare1 scripts_basic
1052 prepare0: archprepare
1053 $(Q)$(MAKE) $(build)=.
1055 # All the preparing..
1058 # Generate some files
1059 # ---------------------------------------------------------------------------
1061 # KERNELRELEASE can change from a few different places, meaning version.h
1062 # needs to be updated, so this check is forced on all builds
1065 define filechk_utsrelease.h
1066 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1067 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1070 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1073 define filechk_version.h
1074 (echo \#define LINUX_VERSION_CODE $(shell \
1075 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1076 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1079 $(version_h): $(srctree)/Makefile FORCE
1080 $(call filechk,version.h)
1081 $(Q)rm -f $(old_version_h)
1083 include/generated/utsrelease.h: include/config/kernel.release FORCE
1084 $(call filechk,utsrelease.h)
1088 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1089 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1091 # ---------------------------------------------------------------------------
1093 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1094 export INSTALL_FW_PATH
1096 PHONY += firmware_install
1098 @mkdir -p $(objtree)/firmware
1099 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1101 # ---------------------------------------------------------------------------
1104 #Default location for installed headers
1105 export INSTALL_HDR_PATH = $(objtree)/usr
1107 # If we do an all arch process set dst to asm-$(hdr-arch)
1108 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1110 PHONY += archheaders
1113 PHONY += archscripts
1117 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1118 $(Q)$(MAKE) $(build)=scripts build_unifdef
1120 PHONY += headers_install_all
1121 headers_install_all:
1122 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1124 PHONY += headers_install
1125 headers_install: __headers
1126 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1127 $(error Headers not exportable for the $(SRCARCH) architecture))
1128 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1129 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1131 PHONY += headers_check_all
1132 headers_check_all: headers_install_all
1133 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1135 PHONY += headers_check
1136 headers_check: headers_install
1137 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1138 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1140 # ---------------------------------------------------------------------------
1145 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1148 $(Q)$(MAKE) -C tools/testing/selftests clean
1150 # ---------------------------------------------------------------------------
1153 ifdef CONFIG_MODULES
1155 # By default, build modules as well
1161 # A module can be listed more than once in obj-m resulting in
1162 # duplicate lines in modules.order files. Those are removed
1163 # using awk while concatenating to the final file.
1166 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1167 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1168 @$(kecho) ' Building modules, stage 2.';
1169 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1170 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1172 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1173 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1175 %/modules.builtin: include/config/auto.conf
1176 $(Q)$(MAKE) $(modbuiltin)=$*
1179 # Target to prepare building external modules
1180 PHONY += modules_prepare
1181 modules_prepare: prepare scripts
1183 # Target to install modules
1184 PHONY += modules_install
1185 modules_install: _modinst_ _modinst_post
1189 @rm -rf $(MODLIB)/kernel
1190 @rm -f $(MODLIB)/source
1191 @mkdir -p $(MODLIB)/kernel
1192 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1193 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1194 rm -f $(MODLIB)/build ; \
1195 ln -s $(CURDIR) $(MODLIB)/build ; \
1197 @cp -f $(objtree)/modules.order $(MODLIB)/
1198 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1199 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1201 # This depmod is only for convenience to give the initial
1202 # boot a modules.dep even before / is mounted read-write. However the
1203 # boot script depmod is the master version.
1204 PHONY += _modinst_post
1205 _modinst_post: _modinst_
1206 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1209 ifeq ($(CONFIG_MODULE_SIG), y)
1210 PHONY += modules_sign
1212 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1215 else # CONFIG_MODULES
1217 # Modules not configured
1218 # ---------------------------------------------------------------------------
1220 modules modules_install: FORCE
1222 @echo >&2 "The present kernel configuration has modules disabled."
1223 @echo >&2 "Type 'make config' and enable loadable module support."
1224 @echo >&2 "Then build a kernel with module support enabled."
1228 endif # CONFIG_MODULES
1231 # Cleaning is done on three levels.
1232 # make clean Delete most generated files
1233 # Leave enough to build external modules
1234 # make mrproper Delete the current configuration, and all generated files
1235 # make distclean Remove editor backup files, patch leftover files and the like
1237 # Directories & files removed with 'make clean'
1238 CLEAN_DIRS += $(MODVERDIR)
1240 # Directories & files removed with 'make mrproper'
1241 MRPROPER_DIRS += include/config usr/include include/generated \
1242 arch/*/include/generated .tmp_objdiff
1243 MRPROPER_FILES += .config .config.old .version .old_version \
1244 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1245 signing_key.pem signing_key.priv signing_key.x509 \
1246 x509.genkey extra_certificates signing_key.x509.keyid \
1247 signing_key.x509.signer vmlinux-gdb.py
1249 # clean - Delete most, but leave enough to build external modules
1251 clean: rm-dirs := $(CLEAN_DIRS)
1252 clean: rm-files := $(CLEAN_FILES)
1253 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1255 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1257 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1260 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1262 clean: archclean vmlinuxclean
1264 # mrproper - Delete all generated files, including .config
1266 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1267 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1268 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1270 PHONY += $(mrproper-dirs) mrproper archmrproper
1272 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1274 mrproper: clean archmrproper $(mrproper-dirs)
1283 @find $(srctree) $(RCS_FIND_IGNORE) \
1284 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1285 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1286 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1287 -type f -print | xargs rm -f
1290 # Packaging of the kernel to various formats
1291 # ---------------------------------------------------------------------------
1292 # rpm target kept for backward compatibility
1293 package-dir := scripts/package
1296 $(Q)$(MAKE) $(build)=$(package-dir) $@
1297 %pkg: include/config/kernel.release FORCE
1298 $(Q)$(MAKE) $(build)=$(package-dir) $@
1299 rpm: include/config/kernel.release FORCE
1300 $(Q)$(MAKE) $(build)=$(package-dir) $@
1303 # Brief documentation of the typical targets used
1304 # ---------------------------------------------------------------------------
1306 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1307 boards := $(sort $(notdir $(boards)))
1308 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1309 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1312 @echo 'Cleaning targets:'
1313 @echo ' clean - Remove most generated files but keep the config and'
1314 @echo ' enough build support to build external modules'
1315 @echo ' mrproper - Remove all generated files + config + various backup files'
1316 @echo ' distclean - mrproper + remove editor backup and patch files'
1318 @echo 'Configuration targets:'
1319 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1321 @echo 'Other generic targets:'
1322 @echo ' all - Build all targets marked with [*]'
1323 @echo '* vmlinux - Build the bare kernel'
1324 @echo '* modules - Build all modules'
1325 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1326 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1327 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1328 @echo ' dir/ - Build all files in dir and below'
1329 @echo ' dir/file.[ois] - Build specified target only'
1330 @echo ' dir/file.ll - Build the LLVM assembly file'
1331 @echo ' (requires compiler support for LLVM assembly generation)'
1332 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1333 @echo ' (requires a recent binutils and recent build (System.map))'
1334 @echo ' dir/file.ko - Build module including final link'
1335 @echo ' modules_prepare - Set up for building external modules'
1336 @echo ' tags/TAGS - Generate tags file for editors'
1337 @echo ' cscope - Generate cscope index'
1338 @echo ' gtags - Generate GNU GLOBAL index'
1339 @echo ' kernelrelease - Output the release version string (use with make -s)'
1340 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1341 @echo ' image_name - Output the image name (use with make -s)'
1342 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1343 echo ' (default: $(INSTALL_HDR_PATH))'; \
1345 @echo 'Static analysers'
1346 @echo ' checkstack - Generate a list of stack hogs'
1347 @echo ' namespacecheck - Name space analysis on compiled kernel'
1348 @echo ' versioncheck - Sanity check on version.h usage'
1349 @echo ' includecheck - Check for duplicate included header files'
1350 @echo ' export_report - List the usages of all exported symbols'
1351 @echo ' headers_check - Sanity check on exported headers'
1352 @echo ' headerdep - Detect inclusion cycles in headers'
1353 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1355 @echo 'Kernel selftest'
1356 @echo ' kselftest - Build and run kernel selftest (run as root)'
1357 @echo ' Build, install, and boot kernel before'
1358 @echo ' running kselftest on it'
1359 @echo ' kselftest-clean - Remove all generated kselftest files'
1361 @echo 'Kernel packaging:'
1362 @$(MAKE) $(build)=$(package-dir) help
1364 @echo 'Documentation targets:'
1365 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1367 @echo 'Architecture specific targets ($(SRCARCH)):'
1368 @$(if $(archhelp),$(archhelp),\
1369 echo ' No architecture specific help defined for $(SRCARCH)')
1372 $(foreach b, $(boards), \
1373 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1375 @$(if $(board-dirs), \
1376 $(foreach b, $(board-dirs), \
1377 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1378 printf " %-16s - Show all of the above\\n" help-boards; \
1381 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1382 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1383 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1384 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1385 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1386 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1387 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1388 @echo ' 1: warnings which may be relevant and do not occur too often'
1389 @echo ' 2: warnings which occur quite often but may still be relevant'
1390 @echo ' 3: more obscure warnings, can most likely be ignored'
1391 @echo ' Multiple levels can be combined with W=12 or W=123'
1393 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1394 @echo 'For further info see the ./README file'
1397 help-board-dirs := $(addprefix help-,$(board-dirs))
1399 help-boards: $(help-board-dirs)
1401 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1403 $(help-board-dirs): help-%:
1404 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1405 @$(if $(boards-per-dir), \
1406 $(foreach b, $(boards-per-dir), \
1407 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1411 # Documentation targets
1412 # ---------------------------------------------------------------------------
1413 %docs: scripts_basic FORCE
1414 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1415 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1417 else # KBUILD_EXTMOD
1420 # External module support.
1421 # When building external modules the kernel used as basis is considered
1422 # read-only, and no consistency checks are made and the make
1423 # system is not used on the basis kernel. If updates are required
1424 # in the basis kernel ordinary make commands (without M=...) must
1427 # The following are the only valid targets when building external
1429 # make M=dir clean Delete all automatically generated files
1430 # make M=dir modules Make all modules in specified dir
1431 # make M=dir Same as 'make M=dir modules'
1432 # make M=dir modules_install
1433 # Install the modules built in the module directory
1434 # Assumes install directory is already created
1436 # We are always building modules
1438 PHONY += crmodverdir
1442 PHONY += $(objtree)/Module.symvers
1443 $(objtree)/Module.symvers:
1444 @test -e $(objtree)/Module.symvers || ( \
1446 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1447 echo " is missing; modules will have no dependencies and modversions."; \
1450 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1451 PHONY += $(module-dirs) modules
1452 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1453 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1455 modules: $(module-dirs)
1456 @$(kecho) ' Building modules, stage 2.';
1457 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1459 PHONY += modules_install
1460 modules_install: _emodinst_ _emodinst_post
1462 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1465 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1466 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1468 PHONY += _emodinst_post
1469 _emodinst_post: _emodinst_
1472 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1474 PHONY += $(clean-dirs) clean
1476 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1478 clean: rm-dirs := $(MODVERDIR)
1479 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1482 @echo ' Building external modules.'
1483 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1485 @echo ' modules - default target, build the module(s)'
1486 @echo ' modules_install - install the module'
1487 @echo ' clean - remove generated files in module directory only'
1491 PHONY += prepare scripts
1494 endif # KBUILD_EXTMOD
1496 clean: $(clean-dirs)
1499 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1500 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1504 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1505 -o -name '*.symtypes' -o -name 'modules.order' \
1506 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1508 -o -name '*.gcno' \) -type f -print | xargs rm -f
1510 # Generate tags for editors
1511 # ---------------------------------------------------------------------------
1512 quiet_cmd_tags = GEN $@
1513 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1515 tags TAGS cscope gtags: FORCE
1518 # Scripts to check various things for consistency
1519 # ---------------------------------------------------------------------------
1521 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1524 find $(srctree)/* $(RCS_FIND_IGNORE) \
1525 -name '*.[hcS]' -type f -print | sort \
1526 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1529 find $(srctree)/* $(RCS_FIND_IGNORE) \
1530 -name '*.[hcS]' -type f -print | sort \
1531 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1534 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1537 $(PERL) $(srctree)/scripts/namespace.pl
1540 $(PERL) $(srctree)/scripts/export_report.pl
1542 endif #ifeq ($(config-targets),1)
1543 endif #ifeq ($(mixed-targets),1)
1545 PHONY += checkstack kernelrelease kernelversion image_name
1547 # UML needs a little special treatment here. It wants to use the host
1548 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1549 # else wants $(ARCH), including people doing cross-builds, which means
1550 # that $(SUBARCH) doesn't work here.
1552 CHECKSTACK_ARCH := $(SUBARCH)
1554 CHECKSTACK_ARCH := $(ARCH)
1557 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1558 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1561 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1564 @echo $(KERNELVERSION)
1567 @echo $(KBUILD_IMAGE)
1569 # Clear a bunch of variables before executing the submake
1571 $(Q)mkdir -p $(objtree)/tools
1572 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1575 $(Q)mkdir -p $(objtree)/tools
1576 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1579 # ---------------------------------------------------------------------------
1580 # Single targets are compatible with:
1581 # - build with mixed source and output
1582 # - build with separate output dir 'make O=...'
1583 # - external modules
1585 # target-dir => where to store outputfile
1586 # build-dir => directory in kernel source tree to use
1588 ifeq ($(KBUILD_EXTMOD),)
1589 build-dir = $(patsubst %/,%,$(dir $@))
1590 target-dir = $(dir $@)
1592 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1593 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1594 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1597 %.s: %.c prepare scripts FORCE
1598 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1599 %.i: %.c prepare scripts FORCE
1600 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1601 %.o: %.c prepare scripts FORCE
1602 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1603 %.lst: %.c prepare scripts FORCE
1604 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1605 %.s: %.S prepare scripts FORCE
1606 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1607 %.o: %.S prepare scripts FORCE
1608 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1609 %.symtypes: %.c prepare scripts FORCE
1610 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1611 %.ll: %.c prepare scripts FORCE
1612 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1615 /: prepare scripts FORCE
1617 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1618 $(build)=$(build-dir)
1619 # Make sure the latest headers are built for Documentation
1620 Documentation/: headers_install
1621 %/: prepare scripts FORCE
1623 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1624 $(build)=$(build-dir)
1625 %.ko: prepare scripts FORCE
1627 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1628 $(build)=$(build-dir) $(@:.ko=.o)
1629 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1631 # FIXME Should go into a make.lib or something
1632 # ===========================================================================
1634 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1635 cmd_rmdirs = rm -rf $(rm-dirs)
1637 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1638 cmd_rmfiles = rm -f $(rm-files)
1640 # Run depmod only if we have System.map and depmod is executable
1641 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1642 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1643 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1645 # Create temporary dir for module support files
1646 # clean it up only when building all modules
1647 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1648 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1650 # read all saved command lines
1652 targets := $(wildcard $(sort $(targets)))
1653 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1655 ifneq ($(cmd_files),)
1656 $(cmd_files): ; # Do not try to update included dependency files
1657 include $(cmd_files)
1660 endif # skip-makefile
1665 # Declare the contents of the .PHONY variable as phony. We keep that
1666 # information in a variable so we can use it in if_changed and friends.