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)
408 KBUILD_AFLAGS_KERNEL :=
409 KBUILD_CFLAGS_KERNEL :=
410 KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
411 KBUILD_AFLAGS_MODULE := -DMODULE
412 KBUILD_CFLAGS_MODULE := -DMODULE
413 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
415 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
416 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
417 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
419 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
420 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
421 export CPP AR NM STRIP OBJCOPY OBJDUMP
422 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
423 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
425 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
426 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
427 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
428 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
429 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
430 export KBUILD_ARFLAGS
432 # When compiling out-of-tree modules, put MODVERDIR in the module
433 # tree rather than in the kernel tree. The kernel tree might
435 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
437 # Files to ignore in find ... statements
439 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
440 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
442 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
443 --exclude CVS --exclude .pc --exclude .hg --exclude .git
445 # ===========================================================================
446 # Rules shared between *config targets and build targets
448 # Basic helpers built in scripts/
449 PHONY += scripts_basic
451 $(Q)$(MAKE) $(build)=scripts/basic
452 $(Q)rm -f .tmp_quiet_recordmcount
454 # To avoid any implicit rule to kick in, define an empty command.
455 scripts/basic/%: scripts_basic ;
457 PHONY += outputmakefile
458 # outputmakefile generates a Makefile in the output directory, if using a
459 # separate output directory. This allows convenient use of make in the
462 ifneq ($(KBUILD_SRC),)
463 $(Q)ln -fsn $(srctree) source
464 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
465 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
468 # Support for using generic headers in asm-generic
471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472 src=asm obj=arch/$(SRCARCH)/include/generated/asm
473 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
474 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
476 # To make sure we do not include .config for any of the *config targets
477 # catch them early, and hand them over to scripts/kconfig/Makefile
478 # It is allowed to specify more targets when calling make, including
479 # mixing *config targets and build targets.
480 # For example 'make oldconfig all'.
481 # Detect when mixed targets is specified, and make a second invocation
482 # of make so .config is not included in this case either (for *config).
484 version_h := include/generated/uapi/linux/version.h
485 old_version_h := include/linux/version.h
487 no-dot-config-targets := clean mrproper distclean \
488 cscope gtags TAGS tags help% %docs check% coccicheck \
489 $(version_h) headers_% archheaders archscripts \
490 kernelversion %src-pkg
496 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
497 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
502 ifeq ($(KBUILD_EXTMOD),)
503 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
505 ifneq ($(words $(MAKECMDGOALS)),1)
510 # install and module_install need also be processed one by one
511 ifneq ($(filter install,$(MAKECMDGOALS)),)
512 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
517 ifeq ($(mixed-targets),1)
518 # ===========================================================================
519 # We're called with mixed targets (*config and build targets).
520 # Handle them one by one.
522 PHONY += $(MAKECMDGOALS) __build_one_by_one
524 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
529 for i in $(MAKECMDGOALS); do \
530 $(MAKE) -f $(srctree)/Makefile $$i; \
534 ifeq ($(config-targets),1)
535 # ===========================================================================
536 # *config targets only - make sure prerequisites are updated, and descend
537 # in scripts/kconfig to make the *config target
539 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
540 # KBUILD_DEFCONFIG may point out an alternative default configuration
541 # used for 'make defconfig'
542 include arch/$(SRCARCH)/Makefile
543 export KBUILD_DEFCONFIG KBUILD_KCONFIG
545 config: scripts_basic outputmakefile FORCE
546 $(Q)$(MAKE) $(build)=scripts/kconfig $@
548 %config: scripts_basic outputmakefile FORCE
549 $(Q)$(MAKE) $(build)=scripts/kconfig $@
552 # ===========================================================================
553 # Build targets only - this includes vmlinux, arch specific targets, clean
554 # targets and others. In general all targets except *config targets.
556 ifeq ($(KBUILD_EXTMOD),)
557 # Additional helpers built in scripts/
558 # Carefully list dependencies so we do not try to build scripts twice
561 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
563 $(Q)$(MAKE) $(build)=$(@)
565 # Objects we will link into vmlinux / subdirs we need to visit
567 drivers-y := drivers/ sound/ firmware/
572 endif # KBUILD_EXTMOD
574 ifeq ($(dot-config),1)
576 -include include/config/auto.conf
578 ifeq ($(KBUILD_EXTMOD),)
579 # Read in dependencies to all Kconfig* files, make sure to run
580 # oldconfig if changes are detected.
581 -include include/config/auto.conf.cmd
583 # To avoid any implicit rule to kick in, define an empty command
584 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
586 # If .config is newer than include/config/auto.conf, someone tinkered
587 # with it and forgot to run make oldconfig.
588 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
589 # we execute the config step to be sure to catch updated Kconfig files
590 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
591 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
593 # external modules needs include/generated/autoconf.h and include/config/auto.conf
594 # but do not care if they are up-to-date. Use auto.conf to trigger the test
595 PHONY += include/config/auto.conf
597 include/config/auto.conf:
598 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
600 echo >&2 " ERROR: Kernel configuration is invalid."; \
601 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
602 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
606 endif # KBUILD_EXTMOD
609 # Dummy target needed, because used as prerequisite
610 include/config/auto.conf: ;
611 endif # $(dot-config)
613 # The all: target is the default when no target is given on the
615 # This allow a user to issue only 'make' to build a kernel including modules
616 # Defaults to vmlinux, but the arch makefile usually adds further targets
619 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
620 # values of the respective KBUILD_* variables
624 include arch/$(SRCARCH)/Makefile
626 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
627 KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
628 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
629 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
630 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
631 KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
633 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
634 KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
636 ifdef CONFIG_PROFILE_ALL_BRANCHES
643 # Tell gcc to never replace conditional load with a non-conditional one
644 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
646 # check for 'asm goto'
647 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
648 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
649 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
652 ifdef CONFIG_READABLE_ASM
653 # Disable optimizations that make assembler listings hard to read.
654 # reorder blocks reorders the control in the function
655 # ipa clone creates specialized cloned functions
656 # partial inlining inlines only parts of functions
657 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
658 $(call cc-option,-fno-ipa-cp-clone,) \
659 $(call cc-option,-fno-partial-inlining)
662 ifneq ($(CONFIG_FRAME_WARN),0)
663 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
666 # Handle stack protector mode.
668 # Since kbuild can potentially perform two passes (first with the old
669 # .config values and then with updated .config values), we cannot error out
670 # if a desired compiler option is unsupported. If we were to error, kbuild
671 # could never get to the second pass and actually notice that we changed
672 # the option to something that was supported.
674 # Additionally, we don't want to fallback and/or silently change which compiler
675 # flags will be used, since that leads to producing kernels with different
676 # security feature characteristics depending on the compiler used. ("But I
677 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
679 # The middle ground is to warn here so that the failed option is obvious, but
680 # to let the build fail with bad compiler flags so that we can't produce a
681 # kernel when there is a CONFIG and compiler mismatch.
683 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
684 stackp-flag := -fstack-protector
685 ifeq ($(call cc-option, $(stackp-flag)),)
686 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
687 -fstack-protector not supported by compiler)
690 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
691 stackp-flag := -fstack-protector-strong
692 ifeq ($(call cc-option, $(stackp-flag)),)
693 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
694 -fstack-protector-strong not supported by compiler)
697 # Force off for distro compilers that enable stack protector by default.
698 stackp-flag := $(call cc-option, -fno-stack-protector)
701 KBUILD_CFLAGS += $(stackp-flag)
704 ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
705 $(warning Cannot use CONFIG_KCOV: \
706 -fsanitize-coverage=trace-pc is not supported by compiler)
711 ifeq ($(cc-name),clang)
712 ifneq ($(CROSS_COMPILE),)
713 CLANG_TRIPLE ?= $(CROSS_COMPILE)
714 CLANG_TARGET := --target=$(notdir $(CLANG_TRIPLE:%-=%))
715 GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
717 ifneq ($(GCC_TOOLCHAIN),)
718 CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
720 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
721 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
722 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
723 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
724 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
725 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
726 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
727 KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
728 # Quiet clang warning: comparison of unsigned expression < 0 is always false
729 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
730 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
731 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
732 # See modpost pattern 2
733 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
734 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
735 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
736 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
739 # These warnings generated too much noise in a regular build.
740 # Use make W=1 to enable them (see scripts/Makefile.build)
741 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
742 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
745 ifdef CONFIG_FRAME_POINTER
746 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
748 # Some targets (ARM with Thumb2, for example), can't be built with frame
749 # pointers. For those, we don't have FUNCTION_TRACER automatically
750 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
751 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
752 # -fomit-frame-pointer with FUNCTION_TRACER.
753 ifndef CONFIG_FUNCTION_TRACER
754 KBUILD_CFLAGS += -fomit-frame-pointer
758 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
760 ifdef CONFIG_DEBUG_INFO
761 ifdef CONFIG_DEBUG_INFO_SPLIT
762 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
766 KBUILD_AFLAGS += -Wa,-gdwarf-2
768 ifdef CONFIG_DEBUG_INFO_DWARF4
769 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
772 ifdef CONFIG_DEBUG_INFO_REDUCED
773 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
774 $(call cc-option,-fno-var-tracking)
777 ifdef CONFIG_FUNCTION_TRACER
778 ifndef CC_FLAGS_FTRACE
779 CC_FLAGS_FTRACE := -pg
781 export CC_FLAGS_FTRACE
782 ifdef CONFIG_HAVE_FENTRY
783 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
785 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
786 KBUILD_AFLAGS += $(CC_USING_FENTRY)
787 ifdef CONFIG_DYNAMIC_FTRACE
788 ifdef CONFIG_HAVE_C_RECORDMCOUNT
789 BUILD_C_RECORDMCOUNT := y
790 export BUILD_C_RECORDMCOUNT
795 # We trigger additional mismatches with less inlining
796 ifdef CONFIG_DEBUG_SECTION_MISMATCH
797 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
800 # arch Makefile may override CC so keep this after arch Makefile is included
801 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
802 CHECKFLAGS += $(NOSTDINC_FLAGS)
804 # warn about C99 declaration after statement
805 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
807 # disable pointer signed / unsigned warnings in gcc 4.0
808 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
810 # disable invalid "can't wrap" optimizations for signed / pointers
811 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
813 # clang sets -fmerge-all-constants by default as optimization, but this
814 # is non-conforming behavior for C and in fact breaks the kernel, so we
815 # need to disable it here generally.
816 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
818 # for gcc -fno-merge-all-constants disables everything, but it is fine
819 # to have actual conforming behavior enabled.
820 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
822 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
823 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
825 # conserve stack if available
826 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
828 # disallow errors like 'EXPORT_GPL(foo);' with missing header
829 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
831 # require functions to have arguments in prototypes, not empty 'int foo()'
832 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
834 # Prohibit date/time macros, which would make the build non-deterministic
835 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
837 # use the deterministic mode of AR if available
838 KBUILD_ARFLAGS := $(call ar-option,D)
840 include scripts/Makefile.kasan
841 include scripts/Makefile.extrawarn
842 include scripts/Makefile.ubsan
844 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
846 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
847 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
848 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
850 # Use --build-id when available.
851 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
852 $(call cc-ldoption, -Wl$(comma)--build-id,))
853 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
854 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
856 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
857 LDFLAGS_vmlinux += $(call ld-option, -X,)
860 # Default kernel image to build when no specific target is given.
861 # KBUILD_IMAGE may be overruled on the command line or
862 # set in the environment
863 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
865 export KBUILD_IMAGE ?= vmlinux
868 # INSTALL_PATH specifies where to place the updated kernel and system map
869 # images. Default is /boot, but you can set it to other values
870 export INSTALL_PATH ?= /boot
873 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
874 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
875 # an argument if needed. Otherwise it defaults to the kernel install path
877 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
880 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
881 # relocations required by build roots. This is not defined in the
882 # makefile but the argument can be passed to make if needed.
885 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
889 # INSTALL_MOD_STRIP, if defined, will cause modules to be
890 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
891 # the default option --strip-debug will be used. Otherwise,
892 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
894 ifdef INSTALL_MOD_STRIP
895 ifeq ($(INSTALL_MOD_STRIP),1)
896 mod_strip_cmd = $(STRIP) --strip-debug
898 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
899 endif # INSTALL_MOD_STRIP=1
902 endif # INSTALL_MOD_STRIP
905 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
906 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
907 # or CONFIG_MODULE_COMPRESS_XZ.
909 mod_compress_cmd = true
910 ifdef CONFIG_MODULE_COMPRESS
911 ifdef CONFIG_MODULE_COMPRESS_GZIP
912 mod_compress_cmd = gzip -n -f
913 endif # CONFIG_MODULE_COMPRESS_GZIP
914 ifdef CONFIG_MODULE_COMPRESS_XZ
915 mod_compress_cmd = xz -f
916 endif # CONFIG_MODULE_COMPRESS_XZ
917 endif # CONFIG_MODULE_COMPRESS
918 export mod_compress_cmd
920 # Select initial ramdisk compression format, default is gzip(1).
921 # This shall be used by the dracut(8) tool while creating an initramfs image.
923 INITRD_COMPRESS-y := gzip
924 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
925 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
926 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
927 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
928 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
929 # do not export INITRD_COMPRESS, since we didn't actually
930 # choose a sane default compression above.
931 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
933 ifdef CONFIG_MODULE_SIG_ALL
934 $(eval $(call config_filename,MODULE_SIG_KEY))
936 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
943 ifeq ($(KBUILD_EXTMOD),)
944 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
946 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
947 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
948 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
950 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
951 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
953 init-y := $(patsubst %/, %/built-in.o, $(init-y))
954 core-y := $(patsubst %/, %/built-in.o, $(core-y))
955 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
956 net-y := $(patsubst %/, %/built-in.o, $(net-y))
957 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
958 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
959 libs-y := $(libs-y1) $(libs-y2)
960 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
962 # Externally visible symbols (used by link-vmlinux.sh)
963 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
964 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
965 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
966 export LDFLAGS_vmlinux
967 # used by scripts/pacmage/Makefile
968 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
970 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
972 # Final link of vmlinux
973 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
974 quiet_cmd_link-vmlinux = LINK $@
976 # Include targets which we want to
977 # execute if the rest of the kernel build went well.
978 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
979 ifdef CONFIG_HEADERS_CHECK
980 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
983 $(Q)$(MAKE) $(build)=samples
985 ifdef CONFIG_BUILD_DOCSRC
986 $(Q)$(MAKE) $(build)=Documentation
988 ifdef CONFIG_GDB_SCRIPTS
989 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
991 +$(call if_changed,link-vmlinux)
993 # The actual objects are generated when descending,
994 # make sure no implicit rule kicks in
995 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
997 # Handle descending into subdirectories listed in $(vmlinux-dirs)
998 # Preset locale variables to speed up the build process. Limit locale
999 # tweaks to this spot to avoid wrong language settings when running
1000 # make menuconfig etc.
1001 # Error messages still appears in the original language
1003 PHONY += $(vmlinux-dirs)
1004 $(vmlinux-dirs): prepare scripts
1005 $(Q)$(MAKE) $(build)=$@
1007 define filechk_kernel.release
1008 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1011 # Store (new) KERNELRELEASE string in include/config/kernel.release
1012 include/config/kernel.release: include/config/auto.conf FORCE
1013 $(call filechk,kernel.release)
1016 # Things we need to do before we recursively start building the kernel
1017 # or the modules are listed in "prepare".
1018 # A multi level approach is used. prepareN is processed before prepareN-1.
1019 # archprepare is used in arch Makefiles and when processed asm symlink,
1020 # version.h and scripts_basic is processed / created.
1022 # Listed in dependency order
1023 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1025 # prepare3 is used to check if we are building in a separate output directory,
1027 # 1) Check that make has not been executed in the kernel src $(srctree)
1028 prepare3: include/config/kernel.release
1029 ifneq ($(KBUILD_SRC),)
1030 @$(kecho) ' Using $(srctree) as source for kernel'
1031 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1032 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1033 echo >&2 " in the '$(srctree)' directory.";\
1038 # prepare2 creates a makefile if using a separate output directory
1039 prepare2: prepare3 outputmakefile asm-generic
1041 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1042 include/config/auto.conf
1045 archprepare: archheaders archscripts prepare1 scripts_basic
1047 prepare0: archprepare
1048 $(Q)$(MAKE) $(build)=.
1050 # All the preparing..
1053 # Generate some files
1054 # ---------------------------------------------------------------------------
1056 # KERNELRELEASE can change from a few different places, meaning version.h
1057 # needs to be updated, so this check is forced on all builds
1060 define filechk_utsrelease.h
1061 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1062 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1065 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1068 define filechk_version.h
1069 (echo \#define LINUX_VERSION_CODE $(shell \
1070 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1071 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1074 $(version_h): $(srctree)/Makefile FORCE
1075 $(call filechk,version.h)
1076 $(Q)rm -f $(old_version_h)
1078 include/generated/utsrelease.h: include/config/kernel.release FORCE
1079 $(call filechk,utsrelease.h)
1083 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1084 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1086 # ---------------------------------------------------------------------------
1088 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1089 export INSTALL_FW_PATH
1091 PHONY += firmware_install
1093 @mkdir -p $(objtree)/firmware
1094 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1096 # ---------------------------------------------------------------------------
1099 #Default location for installed headers
1100 export INSTALL_HDR_PATH = $(objtree)/usr
1102 # If we do an all arch process set dst to asm-$(hdr-arch)
1103 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1105 PHONY += archheaders
1108 PHONY += archscripts
1112 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1113 $(Q)$(MAKE) $(build)=scripts build_unifdef
1115 PHONY += headers_install_all
1116 headers_install_all:
1117 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1119 PHONY += headers_install
1120 headers_install: __headers
1121 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1122 $(error Headers not exportable for the $(SRCARCH) architecture))
1123 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1124 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1126 PHONY += headers_check_all
1127 headers_check_all: headers_install_all
1128 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1130 PHONY += headers_check
1131 headers_check: headers_install
1132 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1133 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1135 # ---------------------------------------------------------------------------
1140 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1143 $(Q)$(MAKE) -C tools/testing/selftests clean
1145 # ---------------------------------------------------------------------------
1148 ifdef CONFIG_MODULES
1150 # By default, build modules as well
1156 # A module can be listed more than once in obj-m resulting in
1157 # duplicate lines in modules.order files. Those are removed
1158 # using awk while concatenating to the final file.
1161 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1162 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1163 @$(kecho) ' Building modules, stage 2.';
1164 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1165 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1167 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1168 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1170 %/modules.builtin: include/config/auto.conf
1171 $(Q)$(MAKE) $(modbuiltin)=$*
1174 # Target to prepare building external modules
1175 PHONY += modules_prepare
1176 modules_prepare: prepare scripts
1178 # Target to install modules
1179 PHONY += modules_install
1180 modules_install: _modinst_ _modinst_post
1184 @rm -rf $(MODLIB)/kernel
1185 @rm -f $(MODLIB)/source
1186 @mkdir -p $(MODLIB)/kernel
1187 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1188 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1189 rm -f $(MODLIB)/build ; \
1190 ln -s $(CURDIR) $(MODLIB)/build ; \
1192 @cp -f $(objtree)/modules.order $(MODLIB)/
1193 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1194 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1196 # This depmod is only for convenience to give the initial
1197 # boot a modules.dep even before / is mounted read-write. However the
1198 # boot script depmod is the master version.
1199 PHONY += _modinst_post
1200 _modinst_post: _modinst_
1201 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1204 ifeq ($(CONFIG_MODULE_SIG), y)
1205 PHONY += modules_sign
1207 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1210 else # CONFIG_MODULES
1212 # Modules not configured
1213 # ---------------------------------------------------------------------------
1215 modules modules_install: FORCE
1217 @echo >&2 "The present kernel configuration has modules disabled."
1218 @echo >&2 "Type 'make config' and enable loadable module support."
1219 @echo >&2 "Then build a kernel with module support enabled."
1223 endif # CONFIG_MODULES
1226 # Cleaning is done on three levels.
1227 # make clean Delete most generated files
1228 # Leave enough to build external modules
1229 # make mrproper Delete the current configuration, and all generated files
1230 # make distclean Remove editor backup files, patch leftover files and the like
1232 # Directories & files removed with 'make clean'
1233 CLEAN_DIRS += $(MODVERDIR)
1235 # Directories & files removed with 'make mrproper'
1236 MRPROPER_DIRS += include/config usr/include include/generated \
1237 arch/*/include/generated .tmp_objdiff
1238 MRPROPER_FILES += .config .config.old .version .old_version \
1239 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1240 signing_key.pem signing_key.priv signing_key.x509 \
1241 x509.genkey extra_certificates signing_key.x509.keyid \
1242 signing_key.x509.signer vmlinux-gdb.py
1244 # clean - Delete most, but leave enough to build external modules
1246 clean: rm-dirs := $(CLEAN_DIRS)
1247 clean: rm-files := $(CLEAN_FILES)
1248 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1250 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1252 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1255 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1257 clean: archclean vmlinuxclean
1259 # mrproper - Delete all generated files, including .config
1261 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1262 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1263 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1265 PHONY += $(mrproper-dirs) mrproper archmrproper
1267 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1269 mrproper: clean archmrproper $(mrproper-dirs)
1278 @find $(srctree) $(RCS_FIND_IGNORE) \
1279 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1280 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1281 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1282 -type f -print | xargs rm -f
1285 # Packaging of the kernel to various formats
1286 # ---------------------------------------------------------------------------
1287 # rpm target kept for backward compatibility
1288 package-dir := scripts/package
1291 $(Q)$(MAKE) $(build)=$(package-dir) $@
1292 %pkg: include/config/kernel.release FORCE
1293 $(Q)$(MAKE) $(build)=$(package-dir) $@
1294 rpm: include/config/kernel.release FORCE
1295 $(Q)$(MAKE) $(build)=$(package-dir) $@
1298 # Brief documentation of the typical targets used
1299 # ---------------------------------------------------------------------------
1301 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1302 boards := $(sort $(notdir $(boards)))
1303 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1304 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1307 @echo 'Cleaning targets:'
1308 @echo ' clean - Remove most generated files but keep the config and'
1309 @echo ' enough build support to build external modules'
1310 @echo ' mrproper - Remove all generated files + config + various backup files'
1311 @echo ' distclean - mrproper + remove editor backup and patch files'
1313 @echo 'Configuration targets:'
1314 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1316 @echo 'Other generic targets:'
1317 @echo ' all - Build all targets marked with [*]'
1318 @echo '* vmlinux - Build the bare kernel'
1319 @echo '* modules - Build all modules'
1320 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1321 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1322 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1323 @echo ' dir/ - Build all files in dir and below'
1324 @echo ' dir/file.[ois] - Build specified target only'
1325 @echo ' dir/file.ll - Build the LLVM assembly file'
1326 @echo ' (requires compiler support for LLVM assembly generation)'
1327 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1328 @echo ' (requires a recent binutils and recent build (System.map))'
1329 @echo ' dir/file.ko - Build module including final link'
1330 @echo ' modules_prepare - Set up for building external modules'
1331 @echo ' tags/TAGS - Generate tags file for editors'
1332 @echo ' cscope - Generate cscope index'
1333 @echo ' gtags - Generate GNU GLOBAL index'
1334 @echo ' kernelrelease - Output the release version string (use with make -s)'
1335 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1336 @echo ' image_name - Output the image name (use with make -s)'
1337 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1338 echo ' (default: $(INSTALL_HDR_PATH))'; \
1340 @echo 'Static analysers'
1341 @echo ' checkstack - Generate a list of stack hogs'
1342 @echo ' namespacecheck - Name space analysis on compiled kernel'
1343 @echo ' versioncheck - Sanity check on version.h usage'
1344 @echo ' includecheck - Check for duplicate included header files'
1345 @echo ' export_report - List the usages of all exported symbols'
1346 @echo ' headers_check - Sanity check on exported headers'
1347 @echo ' headerdep - Detect inclusion cycles in headers'
1348 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1350 @echo 'Kernel selftest'
1351 @echo ' kselftest - Build and run kernel selftest (run as root)'
1352 @echo ' Build, install, and boot kernel before'
1353 @echo ' running kselftest on it'
1354 @echo ' kselftest-clean - Remove all generated kselftest files'
1356 @echo 'Kernel packaging:'
1357 @$(MAKE) $(build)=$(package-dir) help
1359 @echo 'Documentation targets:'
1360 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1362 @echo 'Architecture specific targets ($(SRCARCH)):'
1363 @$(if $(archhelp),$(archhelp),\
1364 echo ' No architecture specific help defined for $(SRCARCH)')
1367 $(foreach b, $(boards), \
1368 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1370 @$(if $(board-dirs), \
1371 $(foreach b, $(board-dirs), \
1372 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1373 printf " %-16s - Show all of the above\\n" help-boards; \
1376 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1377 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1378 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1379 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1380 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1381 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1382 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1383 @echo ' 1: warnings which may be relevant and do not occur too often'
1384 @echo ' 2: warnings which occur quite often but may still be relevant'
1385 @echo ' 3: more obscure warnings, can most likely be ignored'
1386 @echo ' Multiple levels can be combined with W=12 or W=123'
1388 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1389 @echo 'For further info see the ./README file'
1392 help-board-dirs := $(addprefix help-,$(board-dirs))
1394 help-boards: $(help-board-dirs)
1396 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1398 $(help-board-dirs): help-%:
1399 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1400 @$(if $(boards-per-dir), \
1401 $(foreach b, $(boards-per-dir), \
1402 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1406 # Documentation targets
1407 # ---------------------------------------------------------------------------
1408 %docs: scripts_basic FORCE
1409 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1410 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1412 else # KBUILD_EXTMOD
1415 # External module support.
1416 # When building external modules the kernel used as basis is considered
1417 # read-only, and no consistency checks are made and the make
1418 # system is not used on the basis kernel. If updates are required
1419 # in the basis kernel ordinary make commands (without M=...) must
1422 # The following are the only valid targets when building external
1424 # make M=dir clean Delete all automatically generated files
1425 # make M=dir modules Make all modules in specified dir
1426 # make M=dir Same as 'make M=dir modules'
1427 # make M=dir modules_install
1428 # Install the modules built in the module directory
1429 # Assumes install directory is already created
1431 # We are always building modules
1433 PHONY += crmodverdir
1437 PHONY += $(objtree)/Module.symvers
1438 $(objtree)/Module.symvers:
1439 @test -e $(objtree)/Module.symvers || ( \
1441 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1442 echo " is missing; modules will have no dependencies and modversions."; \
1445 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1446 PHONY += $(module-dirs) modules
1447 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1448 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1450 modules: $(module-dirs)
1451 @$(kecho) ' Building modules, stage 2.';
1452 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1454 PHONY += modules_install
1455 modules_install: _emodinst_ _emodinst_post
1457 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1460 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1461 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1463 PHONY += _emodinst_post
1464 _emodinst_post: _emodinst_
1467 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1469 PHONY += $(clean-dirs) clean
1471 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1473 clean: rm-dirs := $(MODVERDIR)
1474 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1477 @echo ' Building external modules.'
1478 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1480 @echo ' modules - default target, build the module(s)'
1481 @echo ' modules_install - install the module'
1482 @echo ' clean - remove generated files in module directory only'
1486 PHONY += prepare scripts
1489 endif # KBUILD_EXTMOD
1491 clean: $(clean-dirs)
1494 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1495 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1499 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1500 -o -name '*.symtypes' -o -name 'modules.order' \
1501 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1503 -o -name '*.gcno' \) -type f -print | xargs rm -f
1505 # Generate tags for editors
1506 # ---------------------------------------------------------------------------
1507 quiet_cmd_tags = GEN $@
1508 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1510 tags TAGS cscope gtags: FORCE
1513 # Scripts to check various things for consistency
1514 # ---------------------------------------------------------------------------
1516 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1519 find $(srctree)/* $(RCS_FIND_IGNORE) \
1520 -name '*.[hcS]' -type f -print | sort \
1521 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1524 find $(srctree)/* $(RCS_FIND_IGNORE) \
1525 -name '*.[hcS]' -type f -print | sort \
1526 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1529 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1532 $(PERL) $(srctree)/scripts/namespace.pl
1535 $(PERL) $(srctree)/scripts/export_report.pl
1537 endif #ifeq ($(config-targets),1)
1538 endif #ifeq ($(mixed-targets),1)
1540 PHONY += checkstack kernelrelease kernelversion image_name
1542 # UML needs a little special treatment here. It wants to use the host
1543 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1544 # else wants $(ARCH), including people doing cross-builds, which means
1545 # that $(SUBARCH) doesn't work here.
1547 CHECKSTACK_ARCH := $(SUBARCH)
1549 CHECKSTACK_ARCH := $(ARCH)
1552 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1553 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1556 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1559 @echo $(KERNELVERSION)
1562 @echo $(KBUILD_IMAGE)
1564 # Clear a bunch of variables before executing the submake
1566 $(Q)mkdir -p $(objtree)/tools
1567 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1570 $(Q)mkdir -p $(objtree)/tools
1571 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1574 # ---------------------------------------------------------------------------
1575 # Single targets are compatible with:
1576 # - build with mixed source and output
1577 # - build with separate output dir 'make O=...'
1578 # - external modules
1580 # target-dir => where to store outputfile
1581 # build-dir => directory in kernel source tree to use
1583 ifeq ($(KBUILD_EXTMOD),)
1584 build-dir = $(patsubst %/,%,$(dir $@))
1585 target-dir = $(dir $@)
1587 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1588 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1589 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1592 %.s: %.c prepare scripts FORCE
1593 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1594 %.i: %.c prepare scripts FORCE
1595 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1596 %.o: %.c prepare scripts FORCE
1597 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1598 %.lst: %.c prepare scripts FORCE
1599 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1600 %.s: %.S prepare scripts FORCE
1601 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1602 %.o: %.S prepare scripts FORCE
1603 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1604 %.symtypes: %.c prepare scripts FORCE
1605 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1606 %.ll: %.c prepare scripts FORCE
1607 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1610 /: prepare scripts FORCE
1612 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1613 $(build)=$(build-dir)
1614 # Make sure the latest headers are built for Documentation
1615 Documentation/: headers_install
1616 %/: prepare scripts FORCE
1618 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1619 $(build)=$(build-dir)
1620 %.ko: prepare scripts FORCE
1622 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1623 $(build)=$(build-dir) $(@:.ko=.o)
1624 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1626 # FIXME Should go into a make.lib or something
1627 # ===========================================================================
1629 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1630 cmd_rmdirs = rm -rf $(rm-dirs)
1632 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1633 cmd_rmfiles = rm -f $(rm-files)
1635 # Run depmod only if we have System.map and depmod is executable
1636 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1637 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1638 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1640 # Create temporary dir for module support files
1641 # clean it up only when building all modules
1642 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1643 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1645 # read all saved command lines
1647 targets := $(wildcard $(sort $(targets)))
1648 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1650 ifneq ($(cmd_files),)
1651 $(cmd_files): ; # Do not try to update included dependency files
1652 include $(cmd_files)
1655 endif # skip-makefile
1660 # Declare the contents of the .PHONY variable as phony. We keep that
1661 # information in a variable so we can use it in if_changed and friends.